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Effects of predation risk across a latitudinal temperature gradient
Catherine M Matassa1, Geoffrey C Trussell2
1Marine Science Center, Northeastern University, East Point, Nahant, MA, 01908, USA. matassa.c@gmail.com.
Oecologia
|December 1, 2014
Summary
Predator nonconsumptive effects (NCEs) on prey are temperature-dependent. Warmer temperatures may offset negative impacts of predation risk for some prey, influencing community dynamics.
Area of Science:
- Ecology
- Marine Biology
- Climate Change Research
Background:
- Nonconsumptive effects (NCEs) of predators impact prey behavior and physiology, influencing ecological communities.
- Prey responses to NCEs are shaped by physiological and environmental factors, particularly temperature for ectotherms.
- Temperature influences metabolism and foraging, affecting prey's trade-offs between food acquisition and safety.
Purpose of the Study:
- To investigate how temperature gradients affect NCEs in a rocky intertidal food chain.
- To determine the impact of green crab (Carcinus maenas) NCEs on snail (Nucella lapillus) foraging, growth, and growth efficiency across a temperature range.
- To assess the implications of warming temperatures for predator-prey interactions under climate change.
Main Methods:
- Examined NCEs in a rocky intertidal food chain (green crabs and snails) across a latitudinal sea surface temperature gradient.
- Transplanted snails to different locations along the temperature gradient to compare foraging, growth, and growth efficiency.
- Analyzed the consistency of NCEs across a broad temperature range (~8.5 °C).
Main Results:
- NCEs of green crabs on snail foraging, growth, and growth efficiency were consistent across the studied temperature range.
- Snails transplanted to warmer southern regions consumed twice as many mussels and grew twice as much as those transplanted to cooler northern regions.
- Warmer temperatures in the south enabled snails under high predation risk to perform as well as or better than snails under low risk in cooler temperatures.
Conclusions:
- For prey below their thermal optimum, warming temperatures may counteract negative predation risks.
- These findings suggest potential benefits for prey populations facing increased predation due to climate change-induced warming.
- Understanding temperature's direct and indirect effects on species interactions is crucial for predicting climate change impacts on ecosystems.
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