The presence of others may shape the economic decision making of a food-storing arboreal squirrel


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


58-5  Sat Jan 2  The presence of others may shape the economic decision making of a food-storing arboreal squirrel Robin, AN*; Nonacs, P; University of California, Los Angeles; University of California, Los Angeles robina@ucla.edu http://www.squirrelgazer.com/

Food-storing awards individuals’ greater control over their survival by distributing collected resources across periods of scarcity. One problem imposed upon animals engaging in food storage is deciding what items are best stored and which are best consumed immediately. For non-hibernating arboreal squirrels, making thousands of these eat-cache decisions accurately and efficiently is critical for survival. The choice to eat or cache has been shown to be influenced by a multitude of factors including seed size, fat content, and tannin levels. Here, we explore how items with future value (e.g. storable food) versus items with only immediate value (e.g. cannot be stored) may shift in relation to the presence of others in the foraging patch. Hetero- and conspecifics may introduce competition for resources, present added mating opportunities, or pose a potential danger that may shift the importance of caching or immediately consuming a food item. Moreover, the presence of others may be an especially pertinent factor in the decision to eat or cache because each animal present has the potential to plunder stored items. Scatter-hoarding squirrels have been shown to adjust their caching related behaviors in response to conspecifics by employing evasive digging tactics. It is less clear, however, how the presence of other squirrels, as well as, animals of other species may shift the decision to cache or eat an item. We are measuring how the number of individuals present at an artificial foraging patch and species composition of those individuals influences a western grey squirrel’s (Sciurus griseus) preference for a storable versus non-storable food item. Further, we relate these preferences to body condition and between-individual variation in several personality traits.

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