Male sexual ornament size is positively associated with reproductive morphology and enhanced fertility in the stalk-eyed fly Teleopsis dalmanni.
Male sexual ornament size is positively associated with reproductive morphology and enhanced fertility in the stalk-eyed fly Teleopsis dalmanni.
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男性性装饰的大小与生殖形态呈正相关，并在茎眼射telepopsis dalmanni中增强了生育能力。
DOI：
10.1186/1471-2148-8-236
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发表时间：
2008-08-18
影响因子：
3.4
通讯作者：
Pomiankowski, Andrew
中科院分区：
文献类型：
--
作者：
Rogers, David W.;Denniff, Matthew;Chapman, Tracey;Fowler, Kevin;Pomiankowski, Andrew
夸张的雄性装饰品和展示往往在雄性只在繁殖期间为雌性提供射精的物种中进化。虽然“好基因”的论点通常被用来解释这一现象，一个更简单的替代方案是可能的，如果男性生殖质量的变化（例如精子数量，射精内容，交配率）是女性生殖成功的重要决定因素。“表型关联生育力假说”指出，女性对男性装饰或展示的偏好是为了确保更高的生育力水平，并推动了夸张的男性特征的进化。雌性的茎眼蝇Teleopsis dalmanni必须频繁交配，以保持高水平的生育能力，并喜欢与雄性交配，表现出大眼睛，条件依赖性装饰。如果说眼孔大小是雄性生殖质量的标志，那么雌性可以通过与眼孔大的雄性交配来直接提高其生殖成功率。在这里，我们调查是否男性eyespan表明附属腺和睾丸的长度，然后问是否与大eyespan男性交配影响女性生育能力。男性眼距是一个更好的预测两个关键的男性生殖性状-附属腺和睾丸长度-比身体大小单独。这种正相关关系在成年附属腺和睾丸成熟过程中的三个水平的环境压力增加。此外，与大眼距雄性一起居住的雌性比小眼距雄性表现出更高的生育能力。雄蝇的眼距具有强烈的方向性择偶偏好，是雄性生殖质量的可靠指标，这既是因为眼距较大的雄性有较大的附属腺和睾丸，也是因为它们赋予雌性较高的生育力。生育力增强可能是因为大眼睛的男性交配更频繁和/或因为他们每次射精转移了更多的精子或其他物质。因此，确保高生育率的需要可能是一种重要的选择力量，在雌性偏好和雄性眼柄果蝇的共同进化中发挥作用。我们的研究结果支持了与表型相关的生育力假说，并表明，它可能是一般的重要性，在解释夸张的男性装饰和显示在物种中，男性只提供女性在生殖过程中射精的进化。
Exaggerated male ornaments and displays often evolve in species where males only provide females with ejaculates during reproduction. Although "good genes" arguments are typically invoked to explain this phenomenon, a simpler alternative is possible if variation in male reproductive quality (e.g. sperm number, ejaculate content, mating rate) is an important determinant of female reproductive success. The "phenotype-linked fertility hypothesis" states that female preference for male ornaments or displays has been selected to ensure higher levels of fertility and has driven the evolution of exaggerated male traits. Females of the stalk-eyed fly Teleopsis dalmanni must mate frequently to maintain high levels of fertility and prefer to mate with males exhibiting large eyespan, a condition-dependent sexual ornament. If eyespan indicates male reproductive quality, females could directly increase their reproductive success by mating with males with large eyespan. Here we investigate whether male eyespan indicates accessory gland and testis length, and then ask whether mating with large eyespan males affects female fertility. Male eyespan was a better predictor of two key male reproductive traits – accessory gland and testis length – than was body size alone. This positive relationship held true over three levels of increasing environmental stress during the maturation of the adult accessory glands and testes. Furthermore, females housed with a large eyespan male exhibited higher levels of fertility than those with small eyespan males. Male eyespan in stalk-eyed flies is subject to strong directional mate preference and is a reliable indicator of male reproductive quality – both because males with larger eyespan have bigger accessory glands and testes, and also as they confer higher fertility on females. Fertility enhancement may have arisen because males with larger eyespan mated more often and/or because they transferred more sperm or other substances per ejaculate. The need to ensure high levels of fertility could thus have been an important selective force in the coevolution of female preference and male eyespan in stalk-eyed flies. Our results support the phenotype-linked fertility hypothesis and suggest that it might be of general importance in explaining the evolution of exaggerated male ornaments and displays in species where males only provide females with ejaculates during reproduction.
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影响因子：
2.5
作者：
Hingle, A;Fowler, K;Pomiankowski, A
通讯作者：
Pomiankowski, A
影响因子：
2.8
作者：
Kimball, RT;Ligon, JD;MerolaZwartjes, M
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2.1
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2.5
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作者：
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