Among-individual diet variation within a lake trout ecotype: Lack of stability of niche use ...
In a polymorphic species, predictable differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is...
| Main Author: | |
|---|---|
| Format: | Dataset |
| Language: | English |
| Published: |
Dryad
2020
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.5061/dryad.8w9ghx3ks https://datadryad.org/stash/dataset/doi:10.5061/dryad.8w9ghx3ks |
| Summary: | In a polymorphic species, predictable differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is patchily distributed and ephemeral. We investigated whether specialization of trophic resources by individuals occurred within the generalist piscivore ecotype of lake trout from Great Bear Lake, Canada, reflective of a form of diversity. Four distinct dietary patterns of resource use within this lake trout ecotype were detected from fatty acid composition, with some variation linked to spatial patterns within Great Bear Lake. Feeding habits of different groups within the ecotype were not associated with detectable morphological or genetic differentiation, suggesting that behavioral plasticity caused the trophic differences. A low level of genetic differentiation was detected between exceptionally large-sized ... : Genepop 3 digit CVA and PCA life-history (length and age) Fatty acids ... |
|---|