Territoriality in a snake

Territorial behaviour, whereby dominant animals gain priority access to critical resources, is widespread in some animal lineages, but rare in others. Theory suggests that territoriality will evolve only when animals can economically defend sites that contain critical resources (typically mates, som...

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Bibliographic Details
Published in:Behavioral ecology and sociobiology 2015-10, Vol.69 (10), p.1657-1661
Main Authors: Webb, Jonathan K, Scott, Mitchell L, Whiting, Martin J, Shine, Richard
Format: Article
Language:English
Subjects:
Animal behavior
Animal Ecology
Animal reproduction
Behavioral Sciences
Biomedical and Life Sciences
Cohabitation
evolution
females
Habitats
Lacertilia
Life Sciences
Lizards
males
mark-recapture studies
Original Article
Rocks
Snakes
territoriality
Zoology
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Summary:Territorial behaviour, whereby dominant animals gain priority access to critical resources, is widespread in some animal lineages, but rare in others. Theory suggests that territoriality will evolve only when animals can economically defend sites that contain critical resources (typically mates, sometimes food). In striking contrast to their close relatives the lizards, male defence of territories for access to mates has not been reported in snakes. In south-eastern Australia, receptive female small-eyed snakes thermoregulate under “hot rocks”, concentrating mating opportunities and thus, potentially allowing males to enhance their fitness by defending these rocks from rivals. We videotaped staged contests between resident and intruder males and analysed data on cohabitation patterns from a long-term (21 years) mark-recapture study. In staged contests, males actively defended hot rocks from intruder males; and thus, larger males actively displaced their smaller rivals. In the wild, larger males were found under rocks with more or larger females. These results suggest that the thermally driven concentration of female small-eyed snakes has rendered hot rocks economically defensible, and thus favoured the evolution of territoriality in a snake.
ISSN:0340-5443
1432-0762
DOI:10.1007/s00265-015-1977-y