Females alter their mate preferences depending on hybridization risk
Females alter their mate preferences depending on hybridization risk
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DOI：
10.1098/rsbl.2022.0310
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发表时间：
2022-11-16
期刊：
影响因子：
3.3
通讯作者：
Pfennig，Karin S.
中科院分区：
文献类型：
--
作者：
Calabrese，Gina M.;Pfennig，Karin S.
与另一个物种交配通常是不适应的，因为它通常会导致没有后代或适应性较低的后代。当杂交成本足够高时，个体应该避免与异种交配，即使这会降低他们与类似异种的高质量同种交配的能力。在这里，我们使用叉足蟾蜍来评估雌性是否会根据异种的存在而改变她们对同种雄性信号(呼叫率)的偏好。当在既包括同种信号又包括异种信号的背景下呈现同种信号时，雌性更喜欢与异种最不相似的雄性特征--即使这些信号可能与较低质量的配偶有关。然而，当这些雌性被呈现给只包括同种信号的背景时，一些雌性改变了她们的偏好，选择了被夸大并代表高质量同种配偶的同种信号。因为只有一些雌性在这两种合唱处理之间切换了她们的偏好，在没有异种的情况下，没有种群水平对夸大的同种雄性信号的偏好。这些结果表明，杂交风险可以改变配偶选择的模式，从而改变男性信号的性选择。此外，他们强调，物种之间的生殖障碍(如配偶选择)的强度和表达可能取决于背景。
Mating with another species is often maladaptive because it generally results in no or low-fitness offspring. When hybridization is sufficiently costly, individuals should avoid mating with heterospecifics even if it reduces their ability to mate with high-quality conspecifics that resemble heterospecifics. Here, we used spadefoot toads,Spea multiplicata,to evaluate whether females alter their preferences for conspecific male sexual signals (call rate) depending on heterospecific presence. When presented with conspecific signals against a background including both conspecific and heterospecific signals, females preferred male traits that were most dissimilar to heterospecifics—even though these signals are potentially associated with lower-quality mates. However, when these same females were presented with a background that included only conspecific signals, some females switched their preferences, choosing conspecific signals that were exaggerated and indicative of high-quality conspecific mates. Because only some females switched their preferences between these two chorus treatments, there was no population-level preference for exaggerated conspecific male signals in the absence of heterospecifics. These results show that hybridization risk can alter patterns of mate choice and, consequently, sexual selection on male signals. Moreover, they emphasize that the strength and expression of reproductive barriers between species (such as mate choice) can be context-dependent.