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Asymmetric Response to Heterotypic Distress Calls in the Lizard Liolaemus chiliensis

机译：蜥蜴Liolaemus chiliensis对异型遇险呼叫的不对称响应。

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摘要

The weeping lizard, Liolaemus chiliensis, emits distress calls when trapped by a predator. Conspecific lizards respond to such calls with prolonged immobility, which may increase their probability of remaining undetected by a predator. This benefit, however, depends on the ability to react to the alert message of the call, which may be impaired by natural variation in the calls. The distress calls of L.chiliensis show geographic variation, and here we tested the response of two geographically distant populations (>700km apart) to local (homotypic) and non-local (heterotypic) distress calls; if populations are finely tuned to their local calls, they may not be able to respond to heterotypic calls. We found that geographic variation in calls affects the lizards' response, but this effect was population dependent; whereas southern lizards responded to calls of both populations, the northern lizards only reacted to homotypic distress calls. The factors that determine this asymmetric response to heterotypic calls are unclear and we discuss three hypotheses that have a common component in the difference in body size between the tested populations, which seems to play a key role in determining the response to distress calls in this species.
机译：垂泪的蜥蜴Liolaemus chiliensis当被捕食者困住时发出求救信号。特定的蜥蜴会长时间不动，以响应此类呼唤，这可能会增加它们未被掠食者发现的可能性。但是，此好处取决于对呼叫警报消息作出反应的能力，这可能会因呼叫的自然变化而受到损害。辣椒的遇险呼叫显示出地理差异，在这里我们测试了两个地理上遥远的种群（相距> 700 km）对本地（同型）和非本地（异型）呼叫的响应。如果将人口微调到本地电话，则他们可能无法响应异型电话。我们发现通话中的地域差异会影响蜥蜴的反应，但这种影响取决于种群。南部蜥蜴对两个种群的呼唤都做出了反应，而北部蜥蜴只对同型遇险者做出了反应。目前尚不清楚决定这种对异型性反应不对称反应的因素，我们讨论了三个假设，这些假设在被测种群之间的体型差异中具有共同的组成部分，这似乎在确定该物种对遇险者反应的反应中起着关键作用。 。

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