NDLI: Risk assessment by crow phenotypes in a hybrid zone

Content Provider	Springer Nature Link
Author	Randler, Christoph
Copyright Year	2007
Abstract	Predation is one of the most selective forces in evolution and, thus, predation may select against hybrids in narrow hybrid zones. It may be possible that parental phenotypes and hybrids differ in their responses towards predators or humans. As predation is difficult to observe I used flight-initiation distance (FID) as a metric of risk assessment. FID is a measurable outcome of the trade-off between fleeing and remaining. Here, I tested whether hybrid and parent crow phenotypes (Corvus corone, Corvus cornix) from the hybrid zone in Eastern Germany differ in their FID. Further, I measured many environmental and social variables to control statistically for their influence on FID. I sampled 154 individuals (53 hooded crows, 54 carrion crows, and 48 hybrids) in the hybrid zone in eastern Germany. I calculated a general linear model using a stepwise backward procedure to establish a minimum model containing only significant variables that explained FID in crows. The variable phenotype (hooded, carrion, hybrid) was then added to the model. There were no differences in FID between hybrids and both parental phenotypes types, suggesting similar risk assessment. This suggests that hybrids may behave similarly in their decision to flee as their parent phenotypes, which, in turn, provides no evidence for a selective disadvantage. An additional analysis focusing on pure phenotypic flocks showed that hybrids in pure hybrid flocks had a lower FID than both parental species in pure flocks. This suggests that hybrids in pure hybrid flocks may be at a disadvantage.
Starting Page	309
Ending Page	316
Page Count	8
File Format	PDF
ISSN	02890771
Journal	Journal of Ethology
Volume Number	26
Issue Number	3
e-ISSN	14395444
Language	English
Publisher	Springer Japan
Publisher Date	2007-09-27
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Corvidae Escape theory Fearfulness Flight-initiation distance Hybridization Predation Risk assessment Neurosciences Evolutionary Biology Animal Ecology Behavioural Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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