Island tameness: An altered cardiovascular stress response in Galápagos marine iguanas
Physiology & Behavior, ISSN: 0031-9384, Vol: 99, Issue: 4, Page: 544-548
2010
- 11Citations
- 87Captures
- 1Mentions
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Metrics Details
- Citations11
- Citation Indexes11
- 11
- CrossRef9
- Captures87
- Readers87
- 87
- Mentions1
- References1
- Wikipedia1
Article Description
Island tameness is a widely documented phenomenon in which island species, particularly those that have evolved with no or few natural predators, show a greatly reduced behavioral response when faced with unfamiliar predators. This insufficient anti-predator response has led to widespread population declines among many island species exposed to novel predators, and has become a serious conservation problem. Despite its prevalence, the underlying physiology of island tameness is not known. Here we report that although Galápagos marine iguanas ( Amblyrhynchus cristatus ) initiated flight from an evolutionarily recent and unfamiliar potential predator (humans), they failed to show the cardiovascular stress response that facilitates successful escape, even after a prior capture experience. In contrast, when approached by a native predator (the Galápagos hawk; Buteo galapagoensis ), marine iguanas show markedly increased heart rate independent of initiating escape movement. The secretion of catecholamines appears to be central to the initiation of escape behavior: naïve animals remotely injected with epinephrine immediately increased flight initiation distance, whereas those injected with corticosterone did not. Our results provide the first evidence that muted escape behavior in predator-naïve species is indicative of both a cognitive deficit in recognizing potential predators and a catecholamine deficit in response. Understanding how the response to predators differs in predator-naïve species could enable the design of maximally effective techniques for inducing an anti-predator response in these vulnerable species.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0031938410000296; http://dx.doi.org/10.1016/j.physbeh.2010.01.016; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=76749101935&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/20109476; https://linkinghub.elsevier.com/retrieve/pii/S0031938410000296; https://dx.doi.org/10.1016/j.physbeh.2010.01.016
Elsevier BV
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