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作者Blamires, Sean J.;Chao, Yi-Chi;Liao, Chen-Pan;Tso, I-Min
出版日期201105
著作名稱Multiple prey cues induce foraging flexibility in a trap-building predator
刊名Animal Behaviour
81
5
頁數955-961
被收錄索引SCI
主題動物
關鍵字assessment rule, behavioural flexibility, environmental cue, extended phenotype, foraging strategy, Nephila pilipes, orb web spider, prey handling, prey type, web architecture
摘要Predators must be behaviourally flexible to counter the temporal and spatial stochastic fluctuations and response variability of their prey. To ensure behaviours are adequate across environments, animals must regularly assess environmental cues. Spider orb webs are an example of a flexible foraging trait in a predator, as web architectural components vary in response to exposure to different prey types and prey traits. The cues used by orb web spiders to initiate changes in web architecture are not known. Current research predicts that prey nutrients and vibratory stimuli are potential candidates, but how they combine to affect spider foraging decisions is not clear. We performed experiments exposing the giant wood spider, Nephila pilipes, to different prey nutrients and vibratory stimuli. Spiders were fed either large profitable prey with high kinetic energy (crickets) or small prey with low kinetic energy (flies). In two treatments the prey nutrients and vibratory cues came from live prey, but in the other two treatments spiders received dead crickets with webs stimulated by flies and vice versa. The spiders fed on live flies built larger webs with more radii that were less stiff and had greater vibration damping. These web characteristics did not differ between the other three treatment groups. Our results show that in the absence of nutrient and vibratory cues from profitable prey, spiders alter their web architecture to build webs better able to capture the less profitable prey at a cost of more material investment, greater web visibility and reduced vibratory signal clarity.
資料連結Full Text
DOIhttps://doi.org/10.1016/j.anbehav.2011.01.022
系統號NO000004918

Aug 16 2018 10:46:44
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