2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 10:15 AM - 10:30 AM | FEAR AND FOOD: THE INTERACTIVE EFFECTS OF STOICHIOMETRIC FOOD QUALITY AND PREDATOR-DERIVED CHEMICAL CUES ON LIFE HISTORY AND PHYSIOLOGY OF DAPHNIA | 306B
FEAR AND FOOD: THE INTERACTIVE EFFECTS OF STOICHIOMETRIC FOOD QUALITY AND PREDATOR-DERIVED CHEMICAL CUES ON LIFE HISTORY AND PHYSIOLOGY OF DAPHNIA
Both nutrient availability and predator-derived chemical cues can have profound effects on zooplankton populations and alter how they function in ecosystems. We conducted a 30-day life table experiment to evaluate how food phosphorus (P) content affects life history responses of Daphnia pulicaria to predator-derived chemical cues. We compared the responses of control animals to animals exposed to cues derived from fish predators (juvenile Lepomis machrochirus) fed food across a P-content gradient (food C:P ratios of 100, 300, 600). We found significant effects of both predator cues and food C:P ratios on nearly all variables measured. Exposure to predator cue generally reduced mass-specific growth rate, age/size at first reproduction, population growth rate, and survival; these same variables were affected additively by elevated food C:P ratios. When dietary P was high, Daphnia exposed to predator cues significantly increased respiration rates compared to control daphnids; however, this trend was reversed as P-availability decreased, suggesting P-limitation of this response to predation risk. These results demonstrate that stoichiometric food quality can modulate responses of Daphnia to predator cues, which can translate into broader effects on population dynamics and ecosystem function.
- C07 Lentic Ecology
- C03 Invertebrates
- S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
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Presenters/Authors
Alex Bell
(), Trent University, albell@trentu.ca;
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