Plasticity in the mating system of the longnose filefish,Oxymonacanthus longirostris, in relation to mate availability
Plasticity in the mating system of the longnose filefish,Oxymonacanthus longirostris, in relation to mate availability
复制标题
长鼻文件鱼（Oxymonacanthus longirostris）交配系统的可塑性与配偶可用性的关系
DOI：
10.1007/bf02769286
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发表时间：
1998
影响因子：
0.9
通讯作者：
A. Nakazono
中科院分区：
文献类型：
--
作者：
T. Kokita;A. Nakazono
在日本冲绳的珊瑚礁上研究了长鼻鱼（Oxymonacanthus longirostris）的交配系统。这个物种以前被证明是一夫一妻制的。鱼通常以异性配对的方式游在一起，雄鱼和雌鱼共享同一个觅食区域。然而，在本研究中发现了一夫一妻制和一夫多妻制（重婚）的雄性。一夫多妻制的雄性，比一夫一妻制的雄性大，在领地内轮流拜访并停留几分钟。虽然大多数雄性在繁殖季节早期是一夫一妻制的，但在繁殖季节后期，超过20%的雄性实行一夫多妻制。前者的成虫性别比是无偏的，但在繁殖季节结束时，由于雄性的消失率较高，雌性的性别比略有偏倚。较高的消失率可能主要是由于繁殖季节身体状况严重恶化造成的雄性死亡率较高。因此，交配制度随着成虫性别比的变化而变化。该物种交配系统的可塑性可能是雄性交配策略的结果，这取决于当地的配偶可用性。
The mating system of the longnose filefish,Oxymonacanthus longirostris, was examined on coral reefs of Okinawa, Japan. This species has been shown previously to be monogamous. Fish were usually found swimming together in heterosexual pairs with the male and female sharing the same feeding territory. However, both monogamous and polygynous (bigamous) males were found in the present study. Polygynous males, which were larger than monogamous males, visited and stayed several minutes in turn with each female within the territories. Although most males were monogamous in the early breeding season, over 20% of males mated polygynously in the late breeding season. The adult sex ratio in the former was unbiased, but became slightly female-biased toward the end of the breeding season because of the higher disappearance rate of males. The higher disappearance rate may be due mainly to a higher mortality rate of males resulting from a greater deterioration of physical condition during the breeding season. Thus, the mating system varied with the change of the adult sex ratio. Plasticity in the mating system of this species may be the outcome of male mating tactic depending on local mate availability.