Invisible pair bonds detected by molecular analyses

Invisible pair bonds detected by molecular analyses
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通过分子分析检测到看不见的成对键

DOI:
10.1098/rsbl.2011.1006
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发表时间:
2011
期刊:
Biology Letter
影响因子:
--
通讯作者:
M.
M.
中科院分区:
--
文献类型:
--
作者:
Takahashi;T.;Ochi;H.;Kohda;M. and Hori;M.

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关注男性和女性之间的配对纽带是研究社会组织演变的基础。因为配对键通常是通过对保持物理接近的配对的直接观察来识别的,所以在没有表现出这种可见的配对的动物中,配对键可能被忽略了。坦噶尼喀湖的圆顶罗非鱼是由在水中孵化的成鱼和未孵化的成鱼组成的鱼群,可见的成鱼是不能识别的。先前的一项研究表明,当幼崽变大时,雌性嘴巴会将幼崽的一小部分转移给雄性。然而,交配对是否保持着配对关系,以便雌性能够将幼崽转移给他们的配偶,这仍然是一个谜。为了回答这个问题,我们利用10个微卫星标记进行了亲子关系分析。分析表明,嘴巴紧闭的成年人很可能是嘴里幼崽的遗传父亲和母亲。这一发现表明,幼鸟从雌性到雄性的转变发生在交配伙伴之间,因此交配伙伴至少在幼鸟转变之前保持着配对纽带。这项研究是第一次在没有观察到物理接近的动物中检测到配对键。
A focus on pair bonds between males and females is fundamental to study the evolution of social organization. Because pair bonds are generally identified from direct observations of pairs that maintain physical proximity, pair bonds may have been overlooked in animals that do not exhibit such visible pairs. The Lake Tanganyika cichlid fishXenotilapia rotundiventralisforms schools that consist of mouthbrooding and non-brooding adults in mid-water, and visible pairs are not recognized. A previous study suggested that mouthbrooding females transfer fractions of the young to males when the young become large. However, it remains a mystery whether the mating pairs maintain pair bonds so that the females can transfer the young to their mates. To answer this question, we conducted a parentage analysis using 10 microsatellite markers. The analysis showed that the mouthbrooding adults were most likely genetic fathers and mothers of the young in their mouths. This finding suggests that the female-to-male shift of young takes place between mating partners, and thus the mating pairs maintain pair bonds at least until the shift of young. The present study is the first to detect pair bonds in animals in which physical proximity has not been observed.
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