Aggression towards unfamiliar intruders by male lizards Eurolophosaurus nanuzae depends on contestantâs body traits: a test of the dear enemy effect
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A reduction of territory ownersâ aggression towards their neighbours in relation to the intrusion of strangers characterises the dear enemy phenomenon. Supposedly, the disparity in aggression levels of territory owners is due to a higher threat imposed by strangers compared to the threat imposed by neighbours. To evaluate the occurrence of the phenomenon in males of the small-sized lizard Eurolophosaurus nanuzae we performed a field manipulative study. We considered three models to run intrusions in malesâ territories: neighbour, tailed stranger (unfamiliar) and tailless stranger intruders. Our results lend support to the presence of dear enemy for this species as residents acted more aggressively towards strangers than to neighbours. In addition, the information we provide supports the relative threat hypothesis as territory owners were more aggressive towards tailed stranger intruders than to tailless stranger intruders. In this sense, tail condition can represent a trait that signals the âresource holding powerâ (RHP) of a lizard. Therefore, we show that beyond neighbourhood recognition, residents are able to evaluate the potential threat of stranger intruders in general, thereby extending the evolutionary gains of the dear enemy by saving energy even in the context they are expected to acts with higher costs.
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| All Time | Past 365 days | Past 30 Days | |
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Aggression towards unfamiliar intruders by male lizards Eurolophosaurus nanuzae depends on contestantâs body traits: a test of the dear enemy effect
In: BehaviourSearch for other papers by Eduardo C. Quintana in
Current site
Google Scholar
PubMed
Search for other papers by Conrado A.B. Galdino in
Current site
Google Scholar
PubMed
A reduction of territory ownersâ aggression towards their neighbours in relation to the intrusion of strangers characterises the dear enemy phenomenon. Supposedly, the disparity in aggression levels of territory owners is due to a higher threat imposed by strangers compared to the threat imposed by neighbours. To evaluate the occurrence of the phenomenon in males of the small-sized lizard Eurolophosaurus nanuzae we performed a field manipulative study. We considered three models to run intrusions in malesâ territories: neighbour, tailed stranger (unfamiliar) and tailless stranger intruders. Our results lend support to the presence of dear enemy for this species as residents acted more aggressively towards strangers than to neighbours. In addition, the information we provide supports the relative threat hypothesis as territory owners were more aggressive towards tailed stranger intruders than to tailless stranger intruders. In this sense, tail condition can represent a trait that signals the âresource holding powerâ (RHP) of a lizard. Therefore, we show that beyond neighbourhood recognition, residents are able to evaluate the potential threat of stranger intruders in general, thereby extending the evolutionary gains of the dear enemy by saving energy even in the context they are expected to acts with higher costs.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 1068 | 107 | 13 |
| Full Text Views | 259 | 1 | 0 |
| PDF Views & Downloads | 76 | 0 | 0 |
