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Binary patch assessment by goldfish under safe and dangerous conditions.
Sundararaj Vijayan1, Burt P Kotler2, Lotan Tamar Tov-Elem3
1Department of Life Sciences, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel.
Behavioural Processes
|July 30, 2018
Summary
Goldfish foraging behavior changes with food availability and predation risk. In the presence of danger, goldfish leave more food in richer patches, balancing food intake with safety.
Area of Science:
- Behavioral Ecology
- Foraging Theory
- Predator-Prey Dynamics
Background:
- Resource distribution is often heterogeneous, requiring foragers to assess patch value.
- Predation risk can significantly influence foraging decisions and patch exploitation strategies.
Purpose of the Study:
- To investigate how goldfish (Carassius auratus) assess and choose between food patches under varying predation risks.
- To determine if goldfish adjust their foraging behavior based on patch quality and perceived danger.
Main Methods:
- Utilized the Giving Up Densities (GUDs) technique to quantify patch assessment in goldfish.
- Conducted a binary choice experiment offering unequal food patches (high vs. low quantity).
- Compared foraging behavior in safe environments versus environments with a predator cue.
Main Results:
- In safe conditions, goldfish equalized GUDs between patches, indicating similar exploitation.
- Under predation risk, goldfish left higher GUDs in the richer patch, signifying a reduced exploitation of valuable resources.
- Behavior suggests a trade-off between maximizing food intake and minimizing predation exposure.
Conclusions:
- Goldfish employ flexible foraging strategies, utilizing both patch assessment and fixed time rules.
- Predation risk alters patch exploitation, leading to a strategic balance between resource gain and survival.
- Findings highlight the ecological importance of considering predation in foraging models.
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