Genetic and social control of male maturation in Phallichthys quadripunctatus (Pisces: Poeciliidae)
Genetic and social control of male maturation in Phallichthys quadripunctatus (Pisces: Poeciliidae)
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Phallichthysquaripunctatus（双鱼座：Poeciliidae）雄性成熟的遗传和社会控制
DOI：
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
D. Reznick
中科院分区：
文献类型：
--
作者：
G. Kolluru;D. Reznick
成熟时的年龄和体型可能会对健康产生重大影响。选择通常有利于早熟个体，因为它们的生存率较高，对种群增长率的相对贡献较大，但如果适应度随着年龄或成熟时的大小而增加，它也可能有利于延迟成熟。几种Poeciliid鱼类的雄性在成熟时表现出年龄和大小的变化，主要由称为P位点的性连锁基因控制。野生捕获的Phallichthys quadripunctatus雄性显示双峰大小分布，这通常与其他Poeciliids中的P-位点多态性有关。我们进行了两个实验，以评估男性的年龄和大小在成熟的遗传和社会环境（存在的成熟或少年男性在发展过程中）对这些特征的影响。我们专门测试了这一假设，即雄性的年龄和大小在成熟的P. quadripunctatus是由一个单一的Y-连锁基因座，并修改了社会环境。虽然我们的研究结果暗示了成熟中的二型性的遗传和环境成分，但大型和小型雄性都能够产生大型和小型儿子，这使我们能够拒绝这一物种成熟时的年龄和大小由单一Y连锁基因座控制的假设。我们的数据不充分符合任何的遗传机制，到目前为止所描述的成熟多态性的poeciliids。我们提出了可能在P. quadripunctatus中起作用的替代机制。
Age and size at maturity can have significant fitness consequences. Selection often favors early‐maturing individuals because of their higher survival to maturity and greater relative contribution to population growth rate, but it may also favor delayed maturation if fitness increases with age or size at maturity. Males of several poeciliid fishes exhibit variation in age and size at maturity primarily controlled by a sex‐linked gene called the P‐locus. Wild‐caught Phallichthys quadripunctatus males show a bimodal size distribution, which is often associated with a P‐locus polymorphism in other poeciliids. We conducted two experiments to evaluate the inheritance of male age and size at maturity and the influence of social environment (presence of mature or juvenile males during development) on these traits. We specifically tested the hypothesis that male age and size at maturity in P. quadripunctatus are governed by a single Y‐linked locus, and modified by the social environment. Although our results imply both a genetic and an environmental component to the dimorphism in maturation, both large and small males were able to sire both large and small sons, allowing us to reject the hypothesis that age and size at maturity in this species are controlled by a single, Y‐linked locus. Our data do not conform adequately to any of the genetic mechanisms described to date for maturation polymorphism in poeciliids. We suggest alternative mechanisms that may operate in P. quadripunctatus.
DOI：
10.1073/pnas.90.16.7794
发表时间：
1993-08-15
影响因子：
11.1
作者：
FRANCIS, RC;SOMA, K;FERNALD, RD
通讯作者：
FERNALD, RD