Faithful fish: territory and mate defence favour monogamy in an African cichlid fish
Faithful fish: territory and mate defence favour monogamy in an African cichlid fish
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DOI：
10.1007/s00265-002-0520-0
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发表时间：
2002-09-01
影响因子：
2.3
通讯作者：
Balshine, S
中科院分区：
文献类型：
--
作者：
Morley, JI;Balshine, S
一夫一妻制被认为发生在一夫多妻制的机会受到强烈的性内竞争的限制，或者当两个人需要保卫一个领土，或者喂养或保护他们的年轻人时。在坦噶尼喀湖的一夫一妻制慈鲷Eretmodus cyanostictus中，父母不喂养年轻人，每种性别都有能力独自照顾所有的后代。我们使用了一系列基于现场的去除实验，以调查其他因素可能会选择一夫一妻制。我们发现，单身的个体通常会保留自己的领地，并很快获得新的配偶。因此，在这个物种中，维持一夫一妻制的似乎不是配偶的可获得性或一对配偶保卫领土的需要本身。然而，丧偶个体的新配偶比原来的配偶更小，并且单独的鱼没有能力接管空的领土。单身女性remated速度比男性和显着增加其防御行为作为单身。因此，我们认为，一夫一妻制的结果需要保证一个高质量的配偶和领土在竞争环境。
Monogamy is thought to occur when the opportunities for polygyny are constrained by strong intra-sexual competition, or when two individuals are needed to defend a territory, or to feed or defend their young. In Eretmodus cyanostictus, a monogamous cichlid from Lake Tanganyika, parents do not feed young and each sex is capable of caring for all the offspring alone. We used a series of field-based removal experiments to investigate what other factors may select for monogamy. We found that single individuals usually retained their territory and gained new mates quickly. Thus, it does not seem to be mate availability or the need for a pair to defend a territory per se that maintains monogamy in this species. However, the new mates of widowed individuals were smaller than the original mates had been, and single fish were not capable of taking over empty territories. Single females remated faster than males and had to significantly increase their defence behaviour as singletons. Thus we argue that monogamy results from the need to guarantee a high quality mate and territory in a competitive environment.