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Hydrobiologia

, Volume 240, Issue 1–3, pp 213–218 | Cite as

Cost of predation avoidance in young-of-year lake trout (Salvelinus namaycush): growth differential in sub-optimal habitats

  • Michael E. McDonald
  • Anne E. Hershey
  • W. John O'Brien
Article

Abstract

Selection of habitat to avoid predation may affect the diet of young-of-year (YOY) lake trout (Salvelinus namaycush). YOY lake trout may use inshore habitat to avoid predation; this habitat may be sub-optimal for growth. To test this, YOY lake trout were penned in nearshore and offshore pelagic areas of two arctic lakes. Toolik Lake had a lake trout population, the other lake, S6, did not. YOY lake trout in Toolik Lake lost weight, but those offshore lost less weight. The YOY lake trout in Lake S6 gained weight and those offshore gained more weight.

The primary diet item of the YOY lake trout in both lakes during this experiment was the zooplankter Diaptomis probilofensis; it was also one of the most abundant species. However, its density inshore in Lake S6 was similar to inshore and offshore densities in Toolik Lake. The increased availability of alternative zooplankton prey in Lake S6 may account for the growth differential of YOY lake trout in Lake S6 relative to Toolik Lake.

Bioenergetic modeling of YOY lake trout suggests that growth similar to that in the offshore of Lake S6 would be necessary for successful recruitment. If the reduced zooplankton availability in Toolik Lake leads to the reduced growth of YOY in the inshore and offshore pelagic areas, then these fish will be more susceptable to winter predation/starvation. For YOY lake trout to survive in Toolik Lake they most likely shift to feeding on benthic prey before the end of their first summer.

Key words

lake trout predation risk zooplankton diet bioenergetics habitat lake 

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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Michael E. McDonald
  • Anne E. Hershey
    • 1
  • W. John O'Brien
    • 2
  1. 1.Dept. of BiologyUniversity of Minnesota-DuluthDuluthUSA
  2. 2.Dept. of Systematics and EcologyUniversity of KansasLawrenceUSA

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