Question: How does prey density affect search time and handling time? Hypothesis: Greater prey density ...

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Question: How does prey density affect search time and handlingtime? Hypothesis: Greater prey density  lower search time,handling time You will need 2 timekeepers – one for search time(t.t.d. = time to discovery) One for handling time (h.t.) 1 datascribe 1 predator Experimental design: make a field of backgroundobjects, place your prey items randomly in this field. For example:Your setup could be a field of less desirable wrapped candies, andthe prey can be more desirable Hershey’s kisses; or perhaps abackground of peanuts in the shell, and the prey some other moredelectable object (in these cases the predator can really eat theprey); or you might use all non-edible objects for background andprey, but something to manipulate on the prey items like foldingthem up, unwrapping, something to represent “handling time”. Theblindfolded predator must search until one prey is encountered andpicked up (t.t.d. recorded); then the predator unwraps and eats theprey (h.t. recorded when finally swallowed and finger signals‘done’) The predator keeps searching and eating until all prey arediscovered. REPEAT for each density with same predator. Repeatoverall experiment at least once, changing roles, with a differentperson as predator. With your data: For each predator, calculatethe mean search time and handling time for each density. Plot yourresults on a graph with prey density on the x-axis and the responsevariable(s) on the y-axis. What can you conclude? Interpret yourresults. Compare among predators and discuss possible reasons forany differences. Each student will write a short report describingtheir set-up, their data summary, and interpretation, and submit itfor one essay credit.

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