Journal
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
Volume 65, Issue 2, Pages 241-247Publisher
SPRINGER
DOI: 10.1007/s00265-010-1032-y
Keywords
Damselfly larvae; Foraging activity; Growth/predation risk trade-off; Predation; Survival selection
Categories
Funding
- KULeuven Research Found
- NSF [DEB-0516104]
- Direct For Biological Sciences
- Division Of Environmental Biology [0714782] Funding Source: National Science Foundation
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Despite the importance of foraging activity for the growth/predation risk trade-off, studies that demonstrated predator-induced survival selection on foraging activity under semi-natural conditions are relatively rare. Here, we tested for fish-induced selection for reduced foraging activity in two larval Enallagma damselflies using a field enclosure experiment. Fish imposed considerable mortality in both damselfly species and survival selection on foraging activity could be detected in Enallagma geminatum. We did not detect selection in Enallagma hageni, probably because this species already was not eating very much in the absence of fish compared to E. geminatum. Both species responded strongly to the presence of predators by reducing their foraging activity. The documented survival selection on foraging activity was detected despite the already low activity levels in fish lake prey species and despite strong predator-induced plasticity in this trait.
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