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Prior knowledge about spatial pattern affects patch assessment rather than movement between patches in
Raymond H G Klaassen1, Bart A Nolet, Casper H A VAN Leeuwen
1Department of Plant-Animal Interactions, Netherlands Institute of Ecology, Royal Netherlands Academy of Arts and Sciences (NIOO-KNAW), PO Box 1299, NL-3600 BG Maarssen, the Netherlands. r.klassen@nioo.knaw.nl
The Journal of Animal Ecology
|December 23, 2006
Summary
Mallards use spatial patterns of food to improve patch assessment, spending less time in empty patches after visiting another empty one, but do not adjust their travel distance based on these patterns.
Area of Science:
- Behavioral Ecology
- Foraging Behavior
- Spatial Cognition
Background:
- Foraging efficiency is enhanced by concentrating effort in food-rich patches.
- Cryptic food sources pose challenges as patch content is initially unknown.
- Knowledge of spatial food distribution can aid foragers in estimating patch content.
Purpose of the Study:
- To investigate how mallards utilize pre-harvest spatial information of food distribution.
- To determine if mallards adjust time spent in patches and movement between patches based on spatial patterns.
- To compare mallard foraging behavior in random, regular, and clumped food patch distributions.
Main Methods:
- Experimental study with mallard ducks (Anas platyrhynchos) foraging in controlled environments.
- Environments featured random, regular, and clumped spatial configurations of full and empty food patches.
- Patch assessment and movement models predicted forager behavior based on intake rates and spatial distributions.
Main Results:
- Mallards in clumped distributions reduced time in empty patches following another empty patch, indicating use of spatial information for patch assessment.
- This effect was not observed in random distributions, suggesting pattern-dependent assessment.
- Movements from empty patches were longer than from full patches across all distributions, contrary to predictions, indicating no pattern-based movement regulation.
Conclusions:
- Mallards effectively use pre-harvest spatial information to refine patch assessment strategies.
- Foraging movement regulation did not appear to be influenced by spatial distribution patterns in this experiment.
- Behavioral adjustments in patch assessment, rather than movement, are prioritized when spatial information is available.
