NDLI: Do weaponless males of the hermit crab Pagurus minutus give up contests without escalation? Behavior of intruders that lack their major cheliped in male

Content Provider	Springer Nature Link
Author	Yasuda, Chiaki I. Koga, Tsuneri
Copyright Year	2016
Abstract	In dyadic contests, theoretical studies have predicted that weaker contestants are less likely to engage in fights to minimize the cost of aggression. Since the major cheliped of decapod crustaceans is critically important as a weapon, contestants without a major cheliped should be more likely to give up the contests. We therefore examined whether loss of the major cheliped by the hermit crab Pagurus minutus would affect their decision to escalate male–male contests over guarded females. Intruders without a major cheliped showed no difference in the frequency of escalation compared with intact intruders, and the decision to give up was affected by the body size difference between the contestants. After escalation, compared with intact intruders, intruders without a major cheliped had significantly decreased success of takeover of a female from opponents, suggesting a strong disadvantage of losing their major cheliped. Although the decision of weaponless intruders to escalate seems irrational, several factors, such as poor accuracy of resource holding potential assessment, the influence of body size, and a high benefit to cost ratio of male–male contests, may have affected their behavior.
Starting Page	249
Ending Page	254
Page Count	6
File Format	PDF
ISSN	02890771
Journal	Journal of Ethology
Volume Number	34
Issue Number	3
e-ISSN	14395444
Language	English
Publisher	Springer Japan
Publisher Date	2016-05-04
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Assessment Autotomy Decision making Male–male competition Resource holding potential Zoology Behavioral Sciences Animal Ecology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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