Asexuals looking for sex:: conflict between species and mate-quality recognition in sailfin mollies (Poecilia latipinna)
Asexuals looking for sex:: conflict between species and mate-quality recognition in sailfin mollies (Poecilia latipinna)
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DOI：
10.1007/s00265-005-0957-z
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发表时间：
2005-10-01
影响因子：
2.3
通讯作者：
Gabor, CR
中科院分区：
文献类型：
--
作者：
Gumm, JM;Gabor, CR
当两个密切相关的物种同域时，物种识别（识别同种）和配偶质量识别（增加健身效益）的过程可能会产生冲突，当异质物种类似于高质量同种时。物种与配偶质量识别的冲突可能是单性雌核发育亚马逊莫莉（Poecilia福尔摩沙）的持久性的一种可能的机制。亚马逊莫莉需要来自密切相关物种的精子（例如，sailfin mollies，P.latipinna）开始胚胎发生，但遗传是严格的母系遗传。在选择配偶时，男性sailfin mollies从人口同域亚马逊mollies可能依赖于性状表明物种身份，而不是那些表明配偶质量。相反，来自异地种群的雄性可能更依赖于指示配偶质量的性状。以前的工作已经发现，男性sailfin mollies在同域表现出显着更大的交配偏好女性sailfin mollies亚马逊mollies相比，男性在allopatry。此外，雄性sailfin mollies更喜欢与更大的同种雌性动物交往，并在它们的存在下产生更多的精子。我们假设，男性sailfin mollies经历的冲突，在物种识别和配偶质量识别的存在下，亚马逊mollies是相对大于女性sailfin mollies。为了验证这一假设，我们配对男性同域和异域人群较大的亚马逊莫莉和较小的女性sailfin莫莉。我们对雄性向同种和异种雌性的交配尝试次数进行了评分。大多数同域和异域种群中的雄性对同种没有明显的偏好。此外，我们发现了一些证据表明，异域和同域种群之间的交配偏好与男性异域表现出更大的异性交配偏好的差异。这些结果表明物种和配偶质量识别之间存在冲突。在同域中，这种冲突可能有助于雌核发育的亚马逊莫莉的持续存在。
When two closely related species are sympatric the process of species recognition (identifying conspecifics) and mate-quality recognition (increased fitness benefits) can yield a conflict when heterospecifics resemble high-quality conspecifics. Conflict in species versus mate-quality recognition may serve as a possible mechanism for the persistence of unisexual, gynogenetic Amazon mollies (Poecilia formosa). Amazon mollies require sperm from closely related species (e.g., sailfin mollies, P. latipinna) to start embryogenesis but inheritance is strictly maternal. When choosing mates, male sailfin mollies from populations sympatric with Amazon mollies may rely on traits indicating species identity rather than those indicating mate quality. Conversely, males from allopatric populations may rely more on traits indicating mate quality. Previous work has found that male sailfin mollies in sympatry exhibit a significantly greater mating preference for female sailfin mollies over Amazon mollies compared to males in allopatry. In addition, male sailfin mollies prefer to associate with and produce more sperm in the presence of larger conspecific females, which are more fecund. We hypothesized that male sailfin mollies experience a conflict in species recognition and mate-quality recognition in the presence of Amazon mollies that are relatively larger than female sailfin mollies. To test this hypothesis, we paired males from sympatric and allopatric populations with a larger Amazon molly and a smaller female sailfin molly. We scored the number of mating attempts that males directed to conspecific and heterospecific females. Males in most sympatric and allopatric populations demonstrate no clear preference for conspecifics. In addition, we found some evidence for a difference in mating preference between allopatric and sympatric populations with males from allopatry showing a greater heterospecific mate preference. These results indicate a conflict between species and mate-quality recognition. In sympatry this conflict may contribute to the persistence of gynogenetic Amazon mollies.