NDLI: Fine-scale food hoarding decisions in New Zealand Robins (Petroica australis): is inter-sexual competition important?

Content Provider	Springer Nature Link
Author	Burns, K. C.
Copyright Year	2008
Abstract	Competition for cache retrieval is hypothesised to influence food hoarding intensity. Previous work has tested this hypothesis by evaluating food hoarding rates during foraging bouts when animals are exposed to different levels of competition for cache retrieval. Little is known about how competition might influence fine-scale food hoarding decisions within foraging bouts. I evaluated fine-scale food hoarding decisions of New Zealand Robins (Petroica australis) by offering mealworms to competitively dominant males and subordinate females, both when they were alone and when they foraged together. I then compared food hoarding rates of sequentially handled prey between sexes and social conditions by assessing how the total number of prey cached increased with the total number of prey handled. Relationships for solitary females, solitary males and paired males were non-linear, indicating that they were more likely to consume initially handled prey, and increasingly likely to cache subsequently handled prey items. Non-linear rates of food hoarding may result from declines in the energetic value of prey that are consumed and stored internally as birds become satiated. Somewhat differently, the relationship for paired females was linear, indicating that paired females make a single food hoarding decision based on bout-level foraging conditions, which results in constant fine-scale food hoarding rates. Constant food hoarding rates in paired females, which experience the strongest competitive effects of any treatment, suggest that food consumption is consistently more advantageous than food hoarding under these conditions, regardless of satiation level. Overall results from this study indicate that New Zealand Robins continuously update food hoarding decisions according to their competitive environment and satiation levels, resulting in scale-dependent patterns in food hoarding intensity.
Starting Page	321
Ending Page	328
Page Count	8
File Format	PDF
ISSN	00218375
Journal	Journal für Ornithologie
Volume Number	150
Issue Number	2
e-ISSN	14390361
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-11-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cache Competition Experiment Foraging Scale Evolutionary Biology Animal Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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