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  • 1. Aikio, S
    et al.
    Pakkasmaa, S
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi. Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Relatedness and competitive assymetry - implications for growth and population dynamics2003Inngår i: Oikos, Vol. 100, s. 283-290Artikkel i tidsskrift (Fagfellevurdert)
  • 2.
    Baglione, Vittorio
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Marcos, JM
    Canestrari, Daniela
    Griesser, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Andreotti, G
    Bardini, C
    Bogliani, G
    Does year-round territoriality rather than habitat saturation explain delayed natal dispersal and cooperative breeding in the carrion crow?2005Inngår i: Journal of animal ecology, Vol. 74, s. 842-851Artikkel i tidsskrift (Fagfellevurdert)
  • 3. Canestrari, Daniela
    et al.
    Chiarati, Elisa
    Marcos, Jose M.
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Baglione, Vittorio
    Helpers but not breeders adjust provisioning effort to year-round territory resource availability in carrion crows2008Inngår i: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 76, s. 943-949Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In most cooperatively breeding bird species, individuals live year round in all-purpose territories that may vary greatly in quality. Territory resource availability is likely to influence the investment in provisioning the brood, and different group members may respond in different ways, according to individual strategies of investment in self-maintenance or current reproduction. Although this may be important for understanding division of labour within the group, few studies have investigated how individuals respond to changing conditions 'at home'. In cooperatively breeding carrion crows, Corvus corone, chick provisioning is costly and both breeders and helpers allocate additional resources to self-maintenance, rather than the current brood, when food availability is temporarily augmented during the breeding season. However, here we show that helpers, but not breeders, increased their chick-feeding rate when territory resources were experimentally enhanced throughout the year. These results indicate a role of year-round territory quality in shaping cooperation at the nest in this species. We suggest that the probabilities of reproducing in the following breeding season, which are higher for breeders than for helpers, modulate the effect of long-term resource abundance on individual provisioning decisions, leading to a higher investment in the current brood by helpers only.

  • 4. Canestrari, Daniela
    et al.
    Marcos, JM
    Baglione, Vittorio
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    False feedings at the nests of Carrion crows Corvus corone corone2004Inngår i: Behavioral Ecology and Sociobiology, Vol. 55, s. 477-483Artikkel i tidsskrift (Fagfellevurdert)
  • 5. Cano, JM
    et al.
    Laurila, Anssi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Palo, J
    Merilä, J
    Population differentiation in G matrix structure due to natural selection in Rana temporaria2004Inngår i: Evolution, Vol. 58, s. 2013-2020Artikkel i tidsskrift (Fagfellevurdert)
  • 6. Dahl, J
    et al.
    Dannewitz, J
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Karlsson, L
    Pettersson, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. Zooekologi.
    Lof, A
    Ragnarsson, B
    The timing of spawning migration: implications of environmental variation, life history, and sex2004Inngår i: Canadian Journal of Zoology, Vol. 82, s. 1864-1870Artikkel i tidsskrift (Fagfellevurdert)
  • 7.
    Dannewitz, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Maes, GE
    Johansson, L
    Wickström, H
    Volckaert, FAM
    Panmixia in the European eel: a matter of time...2005Inngår i: Proceedings of the Royal Society, Series B, Vol. 272, s. 1129-1137Artikkel i tidsskrift (Fagfellevurdert)
  • 8.
    Dannewitz, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi. Institutionen för ekologi och evolution, Populationsbiologi. Zooekologi. populationsbiologi.
    Petersson, E
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi. Institutionen för ekologi och evolution, Populationsbiologi. Zooekologi. Zooekologi.
    Prestegaard, T
    Järvi, T
    Effects of sex-ranching and family background on fitness traits in brown trout Salmo trutta reared under near-natural conditions2003Inngår i: Journal of Applied Ecology, Vol. 40, s. 241-250Artikkel i tidsskrift (Fagfellevurdert)
  • 9.
    Dannewitz, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Petersson, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. Zooekologi.
    Dahl, J
    Prestegaard, T
    Lof, AC
    Järvi, T
    Reproductive success of hatchery-produced and wild-born trout in an experimental stream2004Inngår i: Journal of Applied Ecology, Vol. 41, s. 355-364Artikkel i tidsskrift (Fagfellevurdert)
  • 10.
    Dannewitz, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Petersson, Erik
    Dahl, Jonas
    Prestegaard, Tore
    Löf, Anna-Carin
    Järvi, Torbjörn
    Reproductive success of hatchery produced and wild born brown trout Salmo trutta in an experimental stream2004Inngår i: Journal of Applied Ecology, ISSN 0021-8901, E-ISSN 1365-2664, Vol. 41, nr 2, s. 355-364Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    1.Although releases of hatchery-produced salmonids to support conspecific wildpopulations have increased dramatically during recent decades, little information isavailable about the performance in the wild of hatchery fish and their offspring.Important factors determining the success and genetic outcomes of supportive breedingprogrammes include (i) the relative reproductive success of released hatchery fish in thewild, and (ii) the extent to which the propagation affects the variance in reproductivesuccess in the population as a whole.2.We performed two field experiments on brown troutSalmo truttafrom the RiverDalälven in Sweden, where we examined reproductive success in an experimental stream.In experiment 1 we compared reproductive success between trout from a seventhgenerationhatchery stock of native origin and wild-born trout from the river. In experiment2, we compared reproductive success between seventh-generation hatchery troutand hatchery-reared trout derived from wild-born parents. Individual reproductivesuccess, based on the number of offspring assigned using microsatellite markers, wasassessed on three occasions after reproduction: immediately after hatching and after thefirst and second growth seasons.3.In experiment 1 there were no significant differences in reproductive success betweenseventh-generation hatchery trout and wild-born trout. In experiment 2, males from wildbornparents were more successful than males from the seventh-generation hatcherystock, but this difference was not observed among females.4.There was some evidence for a positive association between body size and reproductivesuccess among females but not males. For males, the number of mates was significantlyassociated with reproductive success, but this relationship was not evident among females.5.The variance in reproductive success was pronounced in both experiments, yieldingestimates of the ratio between the genetically effective size and the census size of ourexperimental populations ranging from 0·12 to 0·59.6.Synthesis and applications. Our results suggest that the reproductive success in thewild of hatchery-produced and wild-born trout with a common genetic backgroundmay be rather similar. These findings, in combination with the pronounced variancein reproductive success observed among breeders, indicate that supportive breedingcan be managed to increase not only the census but also the genetically effective sizeof small, endangered salmonid populations. However, to minimize negative effects ofhatchery selection, it is important to give priority to the restoration of natural habitatsand thereby increase the reproductive output from individuals in the wild.

  • 11.
    Dowling, Damian
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Antos, Mark
    Sahlman, Tobias
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Dispersal and recruitment of juvenile Red-capped robins, Petroica goodenovii2003Inngår i: Emu: Austral Ornithology, ISSN 0158-4197, Vol. 103, s. 199-205Artikkel i tidsskrift (Fagfellevurdert)
  • 12.
    Eggers, Sönke
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Griesser, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Andersson, T
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Nest predation and habitat change interact to influence Siberian jay numbers.2005Inngår i: Oikos, Vol. 111, s. 150-158Artikkel i tidsskrift (Fagfellevurdert)
  • 13.
    Eggers, Sönke
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Griesser, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Predator-induced plasticity in nest visitation rates in the Siberian jay (Perisoreus infaustus).2005Inngår i: Behavioral Ecology, Vol. 16, s. 309-315Artikkel i tidsskrift (Fagfellevurdert)
  • 14.
    Ekblom, Robert
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Immunoecology of the Great Snipe (Gallinago media): Mate Choice, MHC Variation, and Humoral Immunocompetence in a Lekking Bird2004Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    At the centre of the vertebrate immune system is a group of proteins called MHC (major histocompatibility complex) molecules. These function in self – non self recognition and activation of the immune defence against intruding parasites and pathogens. In this thesis I have investigated individual variation in MHC class II genes and antibody producing ability in relation to ecology and behaviour in the great snipe (Gallinago media), a lekking bird, breeding in northern Europe.

    There was much variation in the MHC genes of the great snipe and the sequence data show that balancing selection has been acting on these genes. I found genetic differentiation in the MHC between two separate geographic regions of the great snipe distribution. Furthermore, this structure was more pronounced than that previously found in neutral genetic markers, suggesting that different selection pressures (possibly resulting from variation in parasitic fauna) are acting in these different regions.

    The birds produced specific antibodies following injection with two novel antigens. Males that were chosen as mates, had higher antibody titers than their neighbouring males, suggesting that this ability may be important in female mate choice. Such choice could give the offspring an enhanced immune system or could favour females directly by avoidance of sexually transmitted diseases.

    Females choosing to mate with a male having a different set of MHC genes than their own could give the offspring immune system the ability to react to a wide range of parasites. No such mate choice could, however, be found in the great snipe. Instead, females preferred males with certain MHC alleles, irrespective of their own MHC type. If those alleles confer resistance to parasites currently prevailing in the population, such resistance would be inherited by the offspring, thereby enhancing their fitness.

    Delarbeid
    1. Patterns of polymorphism in the MHC class II of a non-passerine bird, the great snipe (Gallinago media)
    Åpne denne publikasjonen i ny fane eller vindu >>Patterns of polymorphism in the MHC class II of a non-passerine bird, the great snipe (Gallinago media)
    2003 (engelsk)Inngår i: Immunogenetics, ISSN 0093-7711, Vol. 54, s. 734-741Artikkel i tidsskrift (Fagfellevurdert) Published
    Identifikatorer
    urn:nbn:se:uu:diva-92219 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2013-09-05bibliografisk kontrollert
    2. Spatial pattern of MHC class II variation in the great snipe (Gallinago media)
    Åpne denne publikasjonen i ny fane eller vindu >>Spatial pattern of MHC class II variation in the great snipe (Gallinago media)
    Vise andre…
    2007 (engelsk)Inngår i: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 16, nr 7, s. 1439-1451Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The genes of the major histocompatibility complex (MHC) code for proteins involved in antigen recognition and triggering of the adaptive immune response, and are therefore likely to be under selection from parasites. These selection regimes may vary in space and time. Here we report a strong geographical structure in MHC class II B genes of a migrating bird, the great snipe (Gallinago media). Genetic differentiation in the MHC between two ecologically distinct distributional regions (Scandinavian mountain populations vs. East European lowland populations) was still present after statistically controlling for the effect of selectively neutral variation (microsatellites) using partial Mantel tests. This suggests a role for selection in generating this spatial structure and that it represents local adaptation to different environments. Differentiation between populations within the two regions was negligible. Overall, we found a high number of MHC alleles (50, from 175 individuals). This, together with a tendency for a higher rate of nonsynonymous than synonymous substitutions in the peptide binding sites, and high Tajima's D in certain regions of the gene, suggests a history of balancing selection. MHC variation is often thought to be maintained by some form of balancing selection, but the nature of this selection remains unclear. Our results support the hypothesis that spatial variation in selection regimes contributes to the high polymorphism.

    Emneord
    balancing selection, DGGE, F ST, local adaptation, MHC Class II B, partial Mantel test
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-92220 (URN)10.1111/j.1365-294X.2007.03281.x (DOI)000245162700011 ()17391268 (PubMedID)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2017-12-14bibliografisk kontrollert
    3. Major histocompatibility complex variation and mate choice in a lekking bird, the great snipe (Gallinago media)
    Åpne denne publikasjonen i ny fane eller vindu >>Major histocompatibility complex variation and mate choice in a lekking bird, the great snipe (Gallinago media)
    Vise andre…
    2004 (engelsk)Inngår i: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 13, nr 12, s. 3821-3828Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Genes of the major histocompatibility complex (MHC) play a major part in the activation of the vertebrate immune system. In addition, they also appear to function as cues for mate choice. In mammals especially, several kinds of MHC-dependent mate choice have been hypothesized and observed. These include choice of mates that share no or few alleles with the choosing individual, choice of mates with alleles that differ as much as possible from the choosing individual, choice of heterozygous mates, choice of certain genotypes and choice of rare alleles. We investigated these different aspects of mate choice in relation to MHC in a lekking bird species, the great snipe (Gallinago media). We found no evidence for MHC disassortative mating, no preference for males with many MHC alleles and no preference for rare alleles. However, we did find that some allelic lineages were more often found in males with mating success than in males without mating success. Females do not seem to use themselves as references for the MHC-dependent mate choice, rather they seem to prefer males with certain allele types. We speculate that these alleles may be linked to resistance to common parasites.

    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-92221 (URN)10.1111/j.1365-294X.2004.02361.x (DOI)15548294 (PubMedID)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2017-12-14
    4. Female choice and male humoral immune response in the lekking great snipe (Gallinago media)
    Åpne denne publikasjonen i ny fane eller vindu >>Female choice and male humoral immune response in the lekking great snipe (Gallinago media)
    Vise andre…
    2005 (engelsk)Inngår i: Behavioral Ecology, ISSN 1045-2249, E-ISSN 1465-7279, Vol. 16, nr 2, s. 346-351Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Parasites and diseases constitute major evolutionary forces in many natural populations, and thus having an efficient immune defense to resist infections is crucial for many organisms. Properties of the immune response may also influence mate choice decisions in many animals. Theory predicts several advantages for females when choosing males with superior immune systems. These benefits can be both direct (e.g. increased paternal care and reduced disease transmission) and indirect (good genes). We have investigated female choice with respect to antibody response to two novel antigens in males of a lekking bird, the great snipe (Gallinago media). Because of the lek mating system, female choice probably mainly incurs indirect (genetic) rather than direct benefits. Males responded to vaccination with diphtheria and tetanus toxoids by producing specific antibodies to both antigens. Triggering the immune system had no negative impact on display activities or survival. Males that were chosen by females as mates had on average higher antibody response to the tetanus antigen than their neighbors. We did not, however, find any covariance between the strength of the antibody response and male mating success.

    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-92222 (URN)10.1093/beheco/arh168 (DOI)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2017-12-14bibliografisk kontrollert
    5. Humoral immunocompetence in relation to condition, size, asymmetry and MHC class II variation in great snipe (Gallinago media) males
    Åpne denne publikasjonen i ny fane eller vindu >>Humoral immunocompetence in relation to condition, size, asymmetry and MHC class II variation in great snipe (Gallinago media) males
    Vise andre…
    (engelsk)Manuskript (Annet (populærvitenskap, debatt, mm))
    Identifikatorer
    urn:nbn:se:uu:diva-92223 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2013-09-05bibliografisk kontrollert
  • 15.
    Ekblom, Robert
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Grahn, Mats
    Höglund, Jacob
    Patterns of polymorphism in the MHC class II of a non-passerine bird, the great snipe (Gallinago media)2003Inngår i: Immunogenetics, ISSN 0093-7711, Vol. 54, s. 734-741Artikkel i tidsskrift (Fagfellevurdert)
  • 16.
    Ekblom, Robert
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Hasselquist, Dennis
    Sæther, Stein Are
    Fiske, Peder
    Kålås, John Atle
    Grahn, Mats
    Höglund, Jacob
    Humoral immunocompetence in relation to condition, size, asymmetry and MHC class II variation in great snipe (Gallinago media) malesManuskript (Annet (populærvitenskap, debatt, mm))
  • 17.
    Ekblom, Robert
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Saether, Stein Are
    Fiske, Peder
    Kålås, John Atle
    Höglund, Jacob
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Balancing selection, sexual selection and geographic structure in MHC genes of Great Snipe2010Inngår i: Genetica, ISSN 0016-6707, E-ISSN 1573-6857, Vol. 138, nr 4, s. 453-461Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Signatures of balancing selection are often found when investigating the extremely polymorphic regions of major histocompatibility complex (MHC) genes, and it is generally accepted that selective forces maintain this polymorphism. However, the exact nature of the selection is controversial. Theoretical studies have mainly focused on overdominance and/or frequency dependent selection while laboratory studies have emphasised the role of mate choice. Empirical field data, on the other hand, have been relatively scarce. Previously we have found that geographic structure in MHC class II genes of the Great Snipe (Gallinago media) is too pronounced to be explained by neutral forces alone. Here we test the hypothesis that sexual selection on MHC alleles may be influencing this geographic structure between mountain and lowland populations. We found evidence of balancing selection acting on MHC genes in the form of a higher rate of amino-acid changing substitutions compared to silent substitutions in the peptide binding regions. Not only natural selection but also sexual selection may influence MHC polymorphism in this bird because certain MHC alleles have been found to be associated with higher male mating success. Contrary to predictions from negative frequency dependent selection, males carrying locally rare alleles did not have a mating advantage. Instead, the mating success of alleles in a mountain population was positively correlated to their relative frequency in the mountains compared to the lowlands, implying that locally adapted MHC alleles may also be favoured by sexual selection.

  • 18.
    Ekblom, Robert
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Sæther, Stein Are
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolutionsbiologi, Populationsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolutionsbiologi, Evolutionsbiologi.
    Hasselquist, Dennis
    Hannersjö, David
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolutionsbiologi, Populationsbiologi.
    Fiske, Peder
    Kålås, John Atle
    Höglund, Jacob
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolutionsbiologi, Populationsbiologi.
    Female choice and male humoral immune response in the lekking great snipe (Gallinago media)2005Inngår i: Behavioral Ecology, ISSN 1045-2249, E-ISSN 1465-7279, Vol. 16, nr 2, s. 346-351Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Parasites and diseases constitute major evolutionary forces in many natural populations, and thus having an efficient immune defense to resist infections is crucial for many organisms. Properties of the immune response may also influence mate choice decisions in many animals. Theory predicts several advantages for females when choosing males with superior immune systems. These benefits can be both direct (e.g. increased paternal care and reduced disease transmission) and indirect (good genes). We have investigated female choice with respect to antibody response to two novel antigens in males of a lekking bird, the great snipe (Gallinago media). Because of the lek mating system, female choice probably mainly incurs indirect (genetic) rather than direct benefits. Males responded to vaccination with diphtheria and tetanus toxoids by producing specific antibodies to both antigens. Triggering the immune system had no negative impact on display activities or survival. Males that were chosen by females as mates had on average higher antibody response to the tetanus antigen than their neighbors. We did not, however, find any covariance between the strength of the antibody response and male mating success.

  • 19.
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Mass-dependence in the predation risk of unequal competitors; some models2004Inngår i: Oikos, Vol. 105, s. 109-116Artikkel i tidsskrift (Fagfellevurdert)
  • 20.
    Ekman, Jan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Dickinson, JL
    Hatchwell, BJ
    Griesser, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Roles of extended parental investment and territory quality in the evolution and maintenance of delayed dispersal2004Inngår i: Ecology and Evolution of Cooperative Breeding in Birds, Cambridge University Press , 2004, s. 35-47Kapittel i bok, del av antologi (Fagfellevurdert)
  • 21. Ericson, PGP
    et al.
    Jansén, A-L
    Johansson, US
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Inter-generic relationships of the crows, jays, magpies and allied groups (Aves: Corvidae) based on nucleotide sequence data2005Inngår i: Journal of Avian Biology, Vol. 36, s. 222-234Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Forsberg, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Genetic Aspects of Sexual Selection and Mate Choice in Salmonids2008Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The long-term genetic consequences of supportive breeding programs are not well understood. Nevertheless, stocking populations with hatchery-produced fish to compensate for losses of natural production are common practice, for example after constructions of hydroelectric power dams. Hatcheries typically fertilize eggs using ‘mixed-milt fertilizations’, without consideration to natural reproductive behaviours, and hence, natural selective regimes would be altered.

    Here, a series of experiments with focus on Mhc and mate choice in a population of brown trout (Salmo trutta L.) with a history of long-term stocking are presented. The major histocompatibility complex (Mhc) constitutes of genes coding for antigen presentation in the vertebrate immune system. In addition to the immunological function, Mhc genes might also influence reproductive behaviours such as mate choice. For example, in some species individuals are able to recognize Mhc genotypes of potential mates and to some extent base their mate choice on this information. Here, I address these questions on brown trout. Can the phenomena be observed in brown trout? Could such mechanisms help individuals to avoid inbreeding, or are other mechanisms important? How does the artificial rearing of fish for enhancement of natural populations relate to these issues?

    The results presented here, in combination with previous work, shows that several factors are important in the process of pair formation in salmonid species. For example, females of the studied population used more than a single criterion when choosing among the available mates Mhc genes and males with certain Mhc genotypes achieved more matings, possibly an effect from increased fighting ability. Further, the population appears to contain an unnatural high level of Mhc variation, and some results indicate that the population might suffer from outbreeding depression at the Mhc. These negative effects are most likely derived from compression of sub-populations after dam-construction, in combination with supportive breeding with no consideration to natural spawning behaviour.

    Delarbeid
    1. Influence of genetic dissimilarity in the reproductive success and mate choice of brown trout – females fishing for optimal MHC dissimilarity
    Åpne denne publikasjonen i ny fane eller vindu >>Influence of genetic dissimilarity in the reproductive success and mate choice of brown trout – females fishing for optimal MHC dissimilarity
    2007 (engelsk)Inngår i: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 20, nr 5, s. 1859-1869Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    We examined the reproductive success of 48 adult brown trout (Salmo trutta L.) which were allowed to reproduce in a stream that was controlled for the absence of other trout. Parentage analyses based on 11 microsatellites permitted us to infer reproductive success and mate choice preferences in situ. We found that pairs with intermediate major histocompatibility complex (MHC) dissimilarity mated more often than expected by chance. It appears that female choice was the driving force behind this observation because, compared with other individuals, males with intermediate MHC dissimilarity produced a larger proportion of offspring, whereas female reproductive output did not show this pattern. Hence, rather than seeking mates with maximal MHC dissimilarity, as found in several species, brown trout seemed to prefer mates of intermediate MHC difference, thus supporting an optimality-based model for MHC-dependent mate choice.

     

    Emneord
    brown trout, disassortative mating, mate choice, MHC class IIβ, microsatellite, optimal outbreeding, reproductive output, reproductive success, Salmo trutta
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-97245 (URN)10.1111/j.1420-9101.2007.01380.x (DOI)000249166200022 ()17714303 (PubMedID)
    Tilgjengelig fra: 2008-05-06 Laget: 2008-05-06 Sist oppdatert: 2017-09-11bibliografisk kontrollert
    2. Mate choice in brown trout (Salmo trutta L.) - females prefer MHC intermediate males in a fluviarium
    Åpne denne publikasjonen i ny fane eller vindu >>Mate choice in brown trout (Salmo trutta L.) - females prefer MHC intermediate males in a fluviarium
    Vise andre…
    (engelsk)Artikkel i tidsskrift (Fagfellevurdert) Submitted
    Identifikatorer
    urn:nbn:se:uu:diva-97246 (URN)
    Tilgjengelig fra: 2008-05-06 Laget: 2008-05-06 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    3. A ‘good genes’ effect from MHC super-genotypes in brown trout mediated by male competition and not by ornaments
    Åpne denne publikasjonen i ny fane eller vindu >>A ‘good genes’ effect from MHC super-genotypes in brown trout mediated by male competition and not by ornaments
    Vise andre…
    (engelsk)Artikkel i tidsskrift (Fagfellevurdert) Submitted
    Identifikatorer
    urn:nbn:se:uu:diva-97247 (URN)
    Tilgjengelig fra: 2008-05-06 Laget: 2008-05-06 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    4. Ejaculate quality as a sperm competition tactic in precociously mature salmon parr
    Åpne denne publikasjonen i ny fane eller vindu >>Ejaculate quality as a sperm competition tactic in precociously mature salmon parr
    (engelsk)Artikkel i tidsskrift (Fagfellevurdert) Submitted
    Identifikatorer
    urn:nbn:se:uu:diva-97248 (URN)
    Tilgjengelig fra: 2008-05-06 Laget: 2008-05-06 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    5. Homozygote disadvantage at the MHC: more evidence for outbreeding depression
    Åpne denne publikasjonen i ny fane eller vindu >>Homozygote disadvantage at the MHC: more evidence for outbreeding depression
    (engelsk)Manuskript (Annet (populærvitenskap, debatt, mm))
    Identifikatorer
    urn:nbn:se:uu:diva-97249 (URN)
    Tilgjengelig fra: 2008-05-06 Laget: 2008-05-06 Sist oppdatert: 2010-01-14bibliografisk kontrollert
  • 23.
    Forsberg, Lars
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Brockmark, Sofia
    Dannewitz, Johan
    Dahl, Jonas
    Preestegard, Tore
    Petersson, Erik
    Grahn, Mats
    Mate choice in brown trout (Salmo trutta L.) - females prefer MHC intermediate males in a fluviariumArtikkel i tidsskrift (Fagfellevurdert)
  • 24.
    Forsberg, Lars
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Dannewitz, Johan
    Nilsson, Johan
    Kjellström, Karin
    Petersson, Erik
    Böhme, Jan
    Grahn, Mats
    A ‘good genes’ effect from MHC super-genotypes in brown trout mediated by male competition and not by ornamentsArtikkel i tidsskrift (Fagfellevurdert)
  • 25. Grahn, Mats
    et al.
    Forsberg, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Homozygote disadvantage at the MHC: more evidence for outbreeding depressionManuskript (Annet (populærvitenskap, debatt, mm))
  • 26.
    Griesser, M
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi. Institutionen för ekologi och evolution, Populationsbiologi. Populationsbiologi.
    Nepotistic vigilance behavior in Siberian jay parents2003Inngår i: Behavioral Ecology, Vol. 14, s. 246-250Artikkel i tidsskrift (Fagfellevurdert)
  • 27.
    Griesser, Michael
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Ekman, Jan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Nepotistic mobbing behaviour in the Siberian jay, Perisoreus infaustus.2005Inngår i: Animal Behaviour, Vol. 69, s. 345-352Artikkel i tidsskrift (Fagfellevurdert)
  • 28. Hettyey, Attila
    et al.
    Herczeg, Gabor
    Laurila, Anssi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Crochet, Pierre-Andre
    Merila, Juha
    Body temperature, size, nuptial colouration and mating success in male Moor Frogs (Rana arvalis)2009Inngår i: Amphibia-Reptilia, ISSN 0173-5373, E-ISSN 1568-5381, Vol. 30, nr 1, s. 37-43Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Variation in colouration has rarely been related to sexual Selection ill anuran amphibians, even though such a relationship has been proven for many other vertebrate taxa. Male and female Moor Frogs (Rana arvalis) have a cryptic brown colour pattern, but males develop a conspicuous blue nuptial colouration during the reproductive season. To investigate: the possibility that colouration plays a role in sexual selection in this species, we Studied the temporal variation in blue colouration. determined if body size or body temperature affected blueness and investigated if blueness of males could be related to their mating, success. Results confirmed previous observation,,, that males develop and maintain blue colouration for only a very few nights during peak reproductive activity. Colouration of males was unrelated to body size, but males exhibiting higher body temperatures were somewhat bluer (hall males with lower body temperatures. Further, males in amplexus had higher body temperatures than non-mated males. Finally, Mating Success Was positively related to blueness in small males, whereas in large males no such relationship was detected. While our results align with the hypothesis that the bright blue colouration of males may be a target of sexual selection. alternative explanations are also discussed.

  • 29. Hettyey, Attila
    et al.
    Laurila, Anssi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Herczeg, G
    Jönsson, KI
    Kovacs, T
    Merilä, Juha
    Does testis weight decline towards the Subarctic? A case study on the common frog, Rana temporaria2005Inngår i: Naturwissenschaften, Vol. 92, s. 188-192Artikkel i tidsskrift (Fagfellevurdert)
  • 30.
    Höglund, Jacob
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Baines, D
    Larsson, Karl
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Segelbacher, Gernot
    Population fragmentation and genetic variability in European Black Grouse: a progress report2004Inngår i: Sylvia: supplement, Vol. 39, s. 17-23Artikkel i tidsskrift (Fagfellevurdert)
  • 31.
    Höglund, Jacob
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Larsson, Jobs Karl
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Jansman, Hugh A.H.
    Segelbacher, Gernot
    Genetic variability in European black grouse (Tetrao tetrix)2007Inngår i: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 8, nr 1, s. 239-243Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We studied microsatellite genetic variation in 14 different geographic populations of black grouse (Tetrao tetrix) across the European range. Populations were grouped in three different fragmentation categories: isolated, contiguous and continuous, respectively. Genetic diversity, measured as observed heterozygosity (H O), expected heterozygosity (H E) and allelic richness, were lower in isolated populations as compared to the other two categories that did not differ amongst one another. These results imply that lowered genetic variability in black grouse populations is negatively affected by population isolation. Our results suggest that the connectivity of small and isolated populations in Western Europe should be improved or else these face an increased risk of extinction due to genetic and demographic stochasticity.

  • 32.
    Höglund, Jacob
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Shorey, Lisa
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi. populationsbiologi.
    Genetic divergence in the superspecies Manacus2004Inngår i: Biological Journal of the Linnean Socitey, Vol. 81, s. 439-447Artikkel i tidsskrift (Fagfellevurdert)
  • 33.
    Johansson, Markus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Populationsbiologi.
    Effects of Agriculture on Abundance, Genetic Diversity and Fitness in the Common Frog, Rana temporaria2004Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The aims of this thesis were to evaluate the effects of agriculture on amphibians in terms of (i) population genetic consequences of agriculture-induced spatial changes of the landscape and (ii) local adaptation and tolerance to frequently used agrochemicals. The study was performed using the common frog Rana temporaria as a model.

    Abundance, occurrence, genetic diversity and gene flow were negatively affected by agriculture in southern Sweden, but unaffected or even positively affected by agriculture in the central and northern regions, respectively. These test parameters correlated positively with landscape diversity both in the south and in the north. Moreover, the size and occurrence of R. temporaria populations decreased towards the north i.e. the margin of the species’ distribution range. In accordance with theoretical expectations, genetic variability decreased and population substructuring increased as a negative function of (effective) population size.

    Southern Swedish common frogs are naturally exposed to higher levels of nitrates, and thus have a higher tolerance to high nitrate levels than their northern conspecifics. This suggests local adaptation to naturally varying nitrate levels. Consequently, increased anthropogenic supplementation of nitrate could impact more the northern than the southern Swedish common frog populations. Exposure to the pesticides azoxystrobin, cyanazine and permethrin at ecologically relevant concentrations had small or no effects on R. temporaria tadpoles.

    The populations with lowest microsatellite variation (fragmented populations) in southern Sweden had considerably lower fitness in terms of survival and growth as compared to those with the highest genetic variability (non-fragmented populations). The results indicate that populations with low levels of neutral genetic variability were phenotypically less differentiated than populations with higher levels of variability. One possible explanation for this is that the degree of population differentiation in low variability populations has been constrained due to lack of suitable genetic variation or inefficiency of selection relative to genetic drift.

    Delarbeid
    1. A hierarchical analysis of genetic population structure of the common frog (Rana temporaria) at three different spatial scales
    Åpne denne publikasjonen i ny fane eller vindu >>A hierarchical analysis of genetic population structure of the common frog (Rana temporaria) at three different spatial scales
    (engelsk)Artikkel i tidsskrift (Fagfellevurdert) Submitted
    Identifikatorer
    urn:nbn:se:uu:diva-92243 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    2. The influence of landscape structure on occurrence, abundance and genetic diversity of the common frog, Rana temporaria
    Åpne denne publikasjonen i ny fane eller vindu >>The influence of landscape structure on occurrence, abundance and genetic diversity of the common frog, Rana temporaria
    (engelsk)Inngår i: Journal of Molecular EcologyArtikkel i tidsskrift (Fagfellevurdert) Submitted
    Identifikatorer
    urn:nbn:se:uu:diva-92244 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    3. Low and unexpected response to chronic pesticide exposure in Rana temporaria tadpoles
    Åpne denne publikasjonen i ny fane eller vindu >>Low and unexpected response to chronic pesticide exposure in Rana temporaria tadpoles
    (engelsk)Manuskript (Annet (populærvitenskap, debatt, mm))
    Identifikatorer
    urn:nbn:se:uu:diva-92245 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2010-01-14bibliografisk kontrollert
    4. Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria.
    Åpne denne publikasjonen i ny fane eller vindu >>Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria.
    2001 (engelsk)Inngår i: Journal of Aquatic Toxicology, Vol. 54, nr 14, s. 1-14Artikkel i tidsskrift (Fagfellevurdert) Published
    Identifikatorer
    urn:nbn:se:uu:diva-92246 (URN)
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2009-03-31bibliografisk kontrollert
    5. Does habitat fragmentation reduce fitness and adaptability?: A case study of the common frog (Rana temporaria)
    Åpne denne publikasjonen i ny fane eller vindu >>Does habitat fragmentation reduce fitness and adaptability?: A case study of the common frog (Rana temporaria)
    2007 (engelsk)Inngår i: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 16, nr 13, s. 2693-2700Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Studies examining the effects of anthropogenic habitat fragmentation on both neutral and adaptive genetic variability are still scarce. We compared tadpole fitness-related traits (viz. survival probability and body size) among populations of the common frog (Rana temporaria) from fragmented (F) and continuous (C) habitats that differed significantly in population sizes (C > F) and genetic diversity (C > F) in neutral genetic markers. Using data from common garden experiments, we found a significant positive relationship between the mean values of the fitness related traits and the amount of microsatellite variation in a given population. While genetic differentiation in neutral marker loci (F-ST) tended to be more pronounced in the fragmented than in the continuous habitat, genetic differentiation in quantitative traits (Q(ST)) exceeded that in neutral marker traits in the continuous habitat (i.e. Q(ST) > F-ST), but not in the fragmented habitat (i.e. Q(ST) approximate to F-ST). These results suggest that the impact of random genetic drift relative to natural selection was higher in the fragmented landscape where populations were small, and had lower genetic diversity and fitness as compared to populations in the more continuous landscape. The findings highlight the potential importance of habitat fragmentation in impairing future adaptive potential of natural populations.

    Emneord
    amphibians; fitness; fragmentation; genetic variability; microsatellites; QST
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-92247 (URN)10.1111/j.1365-294X.2007.03357.x (DOI)000247561800010 ()
    Tilgjengelig fra: 2004-10-22 Laget: 2004-10-22 Sist oppdatert: 2017-12-14bibliografisk kontrollert
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