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Foraging rules for nectar: food choices by painted ladies
The American Naturalist
|May 12, 2009
Summary
Butterflies adjust their nectar feeding strategies based on energy gain. Their choices reveal that maximizing net gain per meal, not just energy rate, influences foraging behavior.
Area of Science:
- Behavioral Ecology
- Animal Physiology
Background:
- Nectar feeding animals face choices between different sugar concentrations and visit durations.
- Understanding these choices is crucial for comprehending nectar reward evolution.
Purpose of the Study:
- To investigate butterfly foraging choices based on different energetic criteria.
- To determine if butterflies prioritize net energy gain rate, net gain per visit, or net gain per meal.
Main Methods:
- Butterflies were presented with two contrasting nectar feeding locations.
- Choices were recorded during visits with and without feeding, under different sucrose concentration and duration pairings.
- These pairings were designed to test specific foraging rules.
Main Results:
- Butterflies selected nectar options based on maximizing net gain per meal in one pairing.
- In another pairing, choices were based on maximizing net energy gain rate or net gain per visit.
- A shift in foraging rule correlated with changes in the volume of 70% sucrose consumed per visit.
Conclusions:
- Butterfly foraging decisions are influenced by multiple energetic factors, not solely the rate of energy gain.
- Interpreting nectar feeder behavior requires considering various criteria beyond maximizing energy gain rate.
- This highlights the complexity of foraging strategies and nectar reward evolution.
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