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- Title
Introduced lake trout exhibit life history and morphological divergence with depth.
- Authors
Stafford, Craig P.; McPhee, Megan V.; Eby, Lisa A.; Allendorf, Fred W.; Tonn, William
- Abstract
We found that an introduced population of lake trout ( Salvelinus namaycush) in Flathead Lake, Montana, USA, exhibited divergent life history, diet, and morphology after the invasion of Mysis diluviana. A correspondence between stable isotopes (δ13C and δ15N) in lake trout muscle and their prey suggests that individual lake trout exhibited depth preferences. Lake trout 451-600 mm total length showed morphological distinctness between shallow (0-25 m) and deep (60-100 m) collections wherein the latter had deeper bodies and larger eyes. Furthermore, these deep lake trout fed more heavily on Mysis, grew slower, and matured at a smaller size. Lack of genetic divergence between depth groups and the rapid divergence of life histories after Mysis invasion suggest a strong role for environment in producing the observed ecotypic variation. Our research supports resource partitioning by depth and diet as a drivers of phenotypic diversity in lake trout, providing insights into the origins of morphotypes and guidance for conservation of native populations.
- Subjects
FLATHEAD Lake (Mont.); LAKE trout; LIFE history theory; MORPHOLOGY; STABLE isotopes; MYSIS
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 1, p10
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0115