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Effects of resource level and habitat type on behavioural and morphological plasticity in Eurasian perch
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2007 (engelsk)Inngår i: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 152, nr 1, s. 48-56Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Spatial and temporal heterogeneity in the environment is a common feature affecting many natural populations. For example, both the resource levels and optimal habitat choices of individuals likely change over time. One way for organisms to cope with environmental variation is to display adaptive plasticity in traits such as behavior and morphology. Since trait plasticity is hypothesized to be a prerequisite for character divergence, studies of mechanisms behind such plasticity are warranted. In this study, we looked at the interaction of two potentially important environmental variables on behavioral and morphological plasticity in Eurasian perch (Perca fluviatilis L.). More specifically, the plastic responses in activity and morphology of perch exposed to different resource levels and simulated habitat types were studied in an aquarium experiment. The resource level experienced had a large influence on plasticity in both activity and morphology. Behavioral adaptations have been thought to mediate morphological transitions, and we suggest that the morphological response to the resource level was mediated by differences in activity and growth rates. The habitat type also affected morphological plasticity but to a lesser extent, and there was no effect on activity from habitat type. Based on these results, we suggest that it is essential to include several environmental factors acting in concert when studying mechanisms behind trait plasticity. We also propose that variation in resource levels might play a key role in fostering trait plasticity in at least fish populations, while other environmental variables such as divergent habitat complexities and prey types might be less influential. Dynamics in resource levels and optimal habitat choices might thus be important factors influencing character divergence in natural populations.

sted, utgiver, år, opplag, sider
2007. Vol. 152, nr 1, s. 48-56
Emneord [en]
Activity, Growth rate, Morphometric analyses, Morphological variation, Resource polymorphism
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-95048DOI: 10.1007/s00442-006-0588-8ISI: 000245808100005PubMedID: 17431684OAI: oai:DiVA.org:uu-95048DiVA, id: diva2:169109
Tilgjengelig fra: 2006-11-07 Laget: 2006-11-07 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Interplay Between Environment and Genes on Morphological Variation in Perch – Implications for Resource Polymorphisms
Åpne denne publikasjonen i ny fane eller vindu >>Interplay Between Environment and Genes on Morphological Variation in Perch – Implications for Resource Polymorphisms
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Recent research has suggested that individual specialization within populations could be substantial and more common than previously acknowledged. Eurasian perch is one of many species of fish in lakes of postglacial origin that displays a morphological and dietary variation tightly coupled to the littoral and pelagic habitats of the lake. The occurrence of such resource polymorphisms might have important consequences for local adaptation and might also be an important initial step in speciation.

I have investigated the importance of a number of factors for the development of resource polymorphisms using perch as a study organism. I found a weak genetic basis for morphological differences, and the environmental influence on morphology was of such a magnitude that an induced morphology could be reversed. The results nevertheless suggested that genetic differentiation could be substantial at small spatial and temporal scales, even within habitats. Several environmental factors were shown to influence the morphological development, and the results also suggest that behavioral differences could mediate a morphological response. I also found evidence for that competition-driven divergence might only occur when divergence in resource use is favoured at the same time as growth rates are kept sufficiently high for character divergence to be effective. The results finally indicate that divergence in the gut length of individuals might co-vary with habitat and diet use in resource polymorphic populations. This might enhance habitat fidelity and possibly also facilitate the persistence of resource polymorphisms since individuals should experience a cost of switching diets due to a too specific digestive system.

Based on these findings I conclude that small scaled genetic differentiation might be more common than currently acknowledged, that more multi-factorial studies are needed if we are to fully understand the mechanisms behind trait diversity, and that competition not always favors divergence.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2006. s. 55
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 235
Emneord
Ecology, Perch, Resource polymorphism, Genetic differentiation, Phenotypic plasticity, Morphology, Competition, Character divergence, Behavior, Growth rate, Resource level, Gut lenght, Ekologi
Identifikatorer
urn:nbn:se:uu:diva-7212 (URN)91-554-6696-6 (ISBN)
Disputas
2006-11-28, Lindahlssalen, Kärnhuset, EBC, Norbyvägen 18, 752 36, Uppsala, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2006-11-07 Laget: 2006-11-07 Sist oppdatert: 2011-04-20bibliografisk kontrollert

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