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首页> 外文期刊>Behavioral Ecology and Sociobiology >Differences in males' chemical signals between genetic lineages of the lizard Psammodromus algirus promote male intrasexual recognition and aggression but not female mate preferences
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Differences in males' chemical signals between genetic lineages of the lizard Psammodromus algirus promote male intrasexual recognition and aggression but not female mate preferences

机译：蜥蜴Psammodromus algirus的遗传谱系之间男性化学信号的差异会促进男性的性识别和攻击性，但不会促进女性的择偶偏好

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摘要

Interpopulational variation in sexual signals may lead to premating reproductive isolation and eventually may result in speciation. We explored the role of chemical cues secreted by the femoral glands of male lizards Psammdoromus algirus in chemosensory recognition between two distinct genetic lineages from Central Spain. We hypothesized that if there were differences in chemical sexual signals between lineages, these may result in differential recognition and mate preferences. This might lead to reproductive isolation, which would allow the observed morphological and genetic differences between lineages. Our results showed that males of each lineage secreted a singular mixture of compounds in their femoral secretions. However, females were apparently not able to discriminate the lineage of males by chemosensory cues or, alternatively, this discrimination may not be important for females. Moreover, females did not select or reject areas scent marked by males of their own vs. the other lineage. However, previous studies suggest that females might prefer scent of males with particular chemical characteristics that show interindividual variability but do not vary between lineages. Similarly, males did not discriminate between the scents of females of the two lineages, although they had greater chemosensory responses to scents of larger females. In contrast, males clearly discriminated the lineage of other males based on their scents alone, showing chemosensory and aggressive responses that were higher to scents of males of the other lineage. If males of the opposite lineage were more prone to be detected and excluded from a male territory due to their differences in chemical signals, this may probably impede the access of males of one lineage to females of the opposite lineage. This might result in reproductive isolation between lineages. We suggest that the current genetic divergence observed between lineages of P. algirus lizards may be mediated by intrasexual relationships among males, but not by female mate preferences. Significance statement Sexual signals often vary geographically to maximize their efficiency in communication under local conditions. Such variation may, however, affect recognition between individuals of different populations, resulting in reproductive isolation and speciation. We studied two populations (lineages) of a lizard with genetic and morphological differences. We found clear inter-lineage variation in chemical profiles of sexual signals of males. However, females did not recognize these differences by chemosensory cues and did not prefer or reject areas scent-marked by males of the two lineages. In contrast, males recognized and responded more aggressively toward scent of males of the opposite lineage. This might impede access of males of one lineage to females of the other. We suggest that the observed differences between lineages may result from partial reproductive isolation, which can be mediated by agonistic interactions between males rather than by female mate preferences.
机译：人群间性信号的变化可能导致生殖隔离过早，并最终导致物种形成。我们探讨了雄性蜥蜴Psammdoromus algirus的股腺分泌的化学提示在西班牙中部两个不同遗传谱系之间的化学感应识别中的作用。我们假设，如果血统之间的化学性信号存在差异，则这些差异可能会导致差异识别和伴侣偏好。这可能导致生殖隔离，这将允许观察到的血统之间的形态和遗传差异。我们的结果表明，每个谱系的雄性在其股骨分泌物中均分泌出化合物的单一混合物。但是，女性显然无法通过化学感觉线索来区分男性血统，或者，这种区分对女性可能并不重要。此外，雌性并没有选择或拒绝由自己或其他血统的雄性标记的气味区域。但是，先前的研究表明，女性可能更喜欢具有特定化学特征，表现出个体差异但在血统之间没有差异的男性气味。同样，尽管男性对较大雌性的气味具有更强的化学感应反应，但男性并未区分这两个血统的雌性气味。相比之下，雄性仅根据自己的气味就清楚地区分了其他雄性的血统，显示出比其他族裔的男性的气味更高的化学感官和攻击性反应。如果由于其化学信号的差异而更容易发现相反血统的雄性并将其排除在男性外，这可能会阻止一个血统的雄性接近相反血统的雌性。这可能导致血统之间的生殖隔离。我们建议当前观察到的遗传多样性之间的阿尔及利亚蜥蜴蜥蜴可能是由男性之间的性内关系介导的，而不是由女性的交配偏好介导的。重要声明性信号通常在地理位置上有所不同，以在当地条件下最大化其交流效率。但是，这种变异可能会影响不同人群之间的识别，从而导致生殖隔离和物种形成。我们研究了具有遗传和形态差异的蜥蜴的两个种群（世系）。我们发现男性性信号的化学谱中存在明显的谱系间差异。然而，雌性并没有通过化学感觉线索认识到这些差异，并且不喜欢或拒绝两种谱系中雄性标记的气味区域。相反，雄性对相反血统的雄性的气味认识并做出更积极的反应。这可能会阻碍一个血统的雄性与另一血统的雌性的接触。我们建议观察到的血统之间的差异可能是由于部分生殖隔离所致，这可能是由雄性之间的激动性相互作用而不是雌性配偶的偏好介导的。

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