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Conservation Genetics of the Eurasian Otter in Sweden
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi.
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

In this thesis, molecular genetic methods were used to study a threatened species, the Eurasian otter. Estimates of population size and population dynamics parameters were obtained, the genetic effects of a restocking program was evaluated, and a population viability analysis was conducted to assess which demographic parameters are most important for the future viability of an otter population. Many of the studies were based on noninvasive genetic sampling of faeces.

In the genetic evaluation of the restocking program, it was found that the released otters had contributed to subsequent generations. However, the effects were to a large degree limited to the near surroundings of the release areas.

Comparison of two census methods, snow-tracking and noninvasive genetic census based on faeces, showed that approximately only half of the otters detected with the genetic census were found with the snow-tracking census. It is recommended to combine these two methods to obtain the most reliable estimates of population size.

A short-term study on population dynamics in otters showed that apparent survival was higher in females than in males and that the rate of addition was also high and likely influenced by migration.

The population viability analysis incorporated both genetics and demography and revealed that survival to first reproduction was the most crucial demographic parameter affecting the viability of the study population. This result suggests that conservation efforts should be focused on protocols that enhance the survival prospects of young females. Environmental stochasticity was also found to have large effects on the probability of extinction of this population.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis , 2007. , s. 60
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 278
Emneord [en]
Ecology, in situ conservation, individual identification, microsatellites, mtDNA, noninvasive genetic sampling, population dynamics, population size, PVA, restocking
Emneord [sv]
Ekologi
Emneord [la]
Lutra lutra
Identifikatorer
URN: urn:nbn:se:uu:diva-7633ISBN: 978-91-554-6816-3 (tryckt)OAI: oai:DiVA.org:uu-7633DiVA, id: diva2:169790
Disputas
2007-03-23, Zootissalen, F d zoologiska institutionen, Villavägen 9, Uppsala, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2009-03-31bibliografisk kontrollert
Delarbeid
1. Genetic evaluation of an otter translocation program
Åpne denne publikasjonen i ny fane eller vindu >>Genetic evaluation of an otter translocation program
Vise andre…
2004 (engelsk)Inngår i: Conservation Genetics, ISSN 1566-0621 (Print) 1572-9737 (Online), Vol. 5, nr 1, s. 79-88Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:uu:diva-95530 (URN)
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2009-03-31bibliografisk kontrollert
2. The evolution of a restocked otter population in Sweden
Åpne denne publikasjonen i ny fane eller vindu >>The evolution of a restocked otter population in Sweden
(engelsk)Manuskript (Annet (populærvitenskap, debatt, mm))
Identifikatorer
urn:nbn:se:uu:diva-95531 (URN)
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2010-01-14bibliografisk kontrollert
3. Reliability of noninvasive genetic census of otters compared to field censuses
Åpne denne publikasjonen i ny fane eller vindu >>Reliability of noninvasive genetic census of otters compared to field censuses
2007 (engelsk)Inngår i: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 8, nr 5, s. 1097-1107Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Conservation and management actions are often highly dependent on accurate estimations of population sizes. However, these estimates are difficult to obtain for elusive and rare species. We compared two census methods for Eurasian otter: snow tracking and noninvasive genetic census based on the genotyping of faecal samples. With the noninvasive genetic census we detected the presence of almost twice as many otters as with snow tracking (23 and 10–15, respectively), and mark-recapture estimates based on the genetic census indicated that the real number of otters could be even higher. Our results indicate that snow tracking tends to underestimate the number of individuals and also that it is more susceptible to subjective assessment. We compared the strengths and weaknesses of the two methods.

Emneord
Individual identification, Faeces, Monitoring, Population size, Snow tracking
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-95532 (URN)10.1007/s10592-006-9266-y (DOI)000248850700009 ()
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2017-12-14bibliografisk kontrollert
4. Population dynamics parameters obtained by noninvasive genetic methods in a Eurasian otter population
Åpne denne publikasjonen i ny fane eller vindu >>Population dynamics parameters obtained by noninvasive genetic methods in a Eurasian otter population
(engelsk)Manuskript (Annet (populærvitenskap, debatt, mm))
Identifikatorer
urn:nbn:se:uu:diva-95533 (URN)
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2010-01-14bibliografisk kontrollert
5. A demo-genetic analysis of a recovering population of otters in central Sweden
Åpne denne publikasjonen i ny fane eller vindu >>A demo-genetic analysis of a recovering population of otters in central Sweden
2008 (engelsk)Inngår i: Animal Conservation, ISSN 1367-9430, E-ISSN 1469-1795, Vol. 11, nr 6, s. 529-534Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We performed a demo-genetic population viability analysis on a recovering population of otters Lutra lutra in Central Sweden, using data on population size, survival and genetic data from microsatellites. Population data were obtained from genotyping faeces. At present, the size and genetic variability of the population is increasing. We found that survival to first reproduction was the most crucial demographic parameter, and that even slight changes downward in this parameter, might lead to a declining population trajectory. Human factors that can affect mortality are traffic, fishing equipment and traps, and we argue that efforts to minimize road kills by means of safe passages as well as careful fishing efforts in streams and lakes would reduce the risk of extinction. In general, even though the population is now growing and has no inbreeding problem, its small  abundance could make it vulnerable to chance events and environmental perturbations.

Emneord
otter, PVA, genetics, demographic stochasticity, extinction
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-95534 (URN)10.1111/j.1469-1795.2008.00214.x (DOI)000261780600012 ()
Tilgjengelig fra: 2007-03-02 Laget: 2007-03-02 Sist oppdatert: 2017-12-14bibliografisk kontrollert

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