Lecture 17-Optimal foraging

Lecture 17-Optimal foraging - Optimal Foraging Strategies...

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Optimal Foraging Strategies and Avoiding Predators Elements of Ecology: Chapter 14 http://www-csgc.ucsd.edu/NEWSROOM/NEWSRELEASES/RESOURCES/2008/2009CoreRecipients/Sanderlings- web.jpg
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Optimal Foraging Strategies and Avoiding Predators Predators often are prey themselves Need to avoid being eaten while they hunt Can reduce time spent hunting to reduce exposure http://www.houstonaudubon.org/html/ScarletTanagerAMmed.jpg
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Optimal Foraging Strategies Get sufficient food in the shortest amount of time Get the most energy possible per time spent foraging http://k53.pbase.com/o6/37/494537/1/77879804.2UJmsfuB.ProthWarbler2Small.jpg
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Optimal Foraging Strategies Waiting time = how long does it take between prey encounters Handling time = how much time does it take to catch and eat the prey http://k53.pbase.com/o6/37/494537/1/77879804.2UJmsfuB.ProthWarbler2Small.jpg
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Assume both prey are equally nutritious -------------> Red takes less time to process; eat only red -------------> Less prey is available overall; eat both Foraging strategies that minimize time
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Optimal Foraging: Predictions Predators with short prey handling times (relative to search time) should be generalists Searching takes time Eating doesn’t Eat whatever you find, e.g. insect-eating birds
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Optimal Foraging: Predictions Predators with long prey handling times (relative to search time) should be specialists Locating prey is easy Catching and eating prey takes time Specialize (lame, old, sick prey)—e.g. lions
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Photo courtesy of BIOS 230 student Will Beardman
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This note was uploaded on 10/07/2011 for the course BIOS 230 taught by Professor Gibbons during the Spring '08 term at Ill. Chicago.

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Lecture 17-Optimal foraging - Optimal Foraging Strategies...

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