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Reproductive isolation in temperate reef fishes

机译：温带礁鱼的生殖隔离

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Opportunity and recognition isolation can lead directly to reproductive isolation, the former via divergence in the location and timing of breeding, and the latter via differential mate preferences. We describe the potential significance of these factors in the maintenance of reproductive isolation in a clade of triplefin fishes that occur sympatrically around coastal New Zealand. Specifically, we investigate the roles of spawning time and nesting habitat in promoting opportunity isolation, and of interspecific variation in male body length and breeding colouration in promoting recognition isolation. The triplefin species investigated are reproductively active over several months and show high overlap in breeding times, thus rejecting temporal isolation as a mechanism. Differences in nesting habitats resulted in a reduced probability of encounter between some species, especially between sister-species pairs. Interspecific colour differences generally decreased during the reproductive period, and males of sister-species pairs showed no interspecific colour differences in the ultraviolet light spectrum, thus mate selection based on male colour patterns is unlikely to lead to premating isolation. Finally, males of closely related triplefin species differed in body length, a secondary sexual trait often involved in assortative mating. Thus, spatial differences in nesting habitats reduce the chances of encountering allospecific mates, which may facilitate opportunity isolation and differences in male length, possibly related to species-specific female selection on male body size, may lead to recognition isolation. Therncombination of limited spatial overlap in nesting habitat and differences in male body size may facilitate species assortative mating in sympatry or parapatry.
机译：机会和识别的隔离可以直接导致生殖隔离，前者通过繁殖地点和时间的差异，后者通过不同的配偶偏好。我们描述了在新西兰沿海附近同伴发生的三鳍鱼类进化枝中，这些因素在维持生殖隔离中的潜在意义。具体来说，我们调查产卵时间和筑巢栖息地在促进机会隔离中的作用，以及雄性体长和繁殖着色的种间变异在促进识别隔离中的作用。研究的三鳍金枪鱼物种在几个月内具有生殖活性，并且在繁殖时间内表现出高度重叠，因此拒绝了暂时隔离作为一种机制。筑巢栖息地的差异导致某些物种之间，尤其是姊妹物种对之间相遇的可能性降低。种间色差通常在生殖期减少，而姊妹物种对的雄性在紫外光谱中没有种间色差，因此基于雄性色型的配偶选择不太可能导致过早分离。最后，密切相关的三鳍金枪鱼物种的雄性体长不同，这是第二性征，经常参与分类交配。因此，筑巢栖息地的空间差异减少了遇到同种异体伴侣的机会，这可能有助于机会隔离，而雄性长度的差异可能与雄性体型上特定物种的雌性选择有关，可能导致识别隔离。巢生境中有限的空间重叠和雄性体型差异的组合可能会促进交配或副交配物种的物种交配。

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