排序方式: 共有1条查询结果,搜索用时 0 毫秒
1
1.
Heavier birds react faster to predators: individual differences in the detection of stalking and ambush predators 总被引:1,自引:1,他引:0
Katherine A. Jones John R. Krebs Mark J. Whittingham 《Behavioral ecology and sociobiology》2009,63(9):1319-1329
The relationship between body mass and reactions speed in response to a predatory threat is poorly understood. Theory predicts
that different vigilance patterns are optimal for the detection of different predator types. We suggest that birds of different
individual state might also differ in their speed of response dependent upon predator type. We used laboratory trials of wild
caught chaffinches (Fringilla coelebs) to determine how between individual differences in chaffinch behaviour and state correlate with latency to react to a ground
predator model (domestic cat), thus providing a comparison with previous work in the same model system using aerial predator
models. In experiment 1, we observed chaffinch responses to a moving cat model, simulating a stalking predator. In experiment
2, we used a camouflaged cat model simulating an ambush predator. Both experiments show evidence suggesting heavier individuals
(which previous literature has linked to impaired flight performance) responded more quickly to the model cat. Heavier individuals
also had shorter interscan intervals. In contrast to a previous study, both experiments found individuals with a higher intake
rate were not faster at responding to the cat model. In addition, individuals in experiment 1 that head turned more while
scanning were slower to respond to the stalking cat model. Our work suggests that although heavier individuals may have impaired escape performance
they appear to show behavioural compensation by allocating more attention to anti-predator behaviour and by modifying their
interscan intervals, resulting in faster response times to a ground predator. We suggest more experiments investigating response
time to different predatory types and explicitly manipulating state to elucidate cause and effect. 相似文献
1