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首页> 外文期刊>Estuarine Coastal and Shelf Science >Occurrence of tropical fishes in temperate southeastern Australia: Role of the East Australian Current
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Occurrence of tropical fishes in temperate southeastern Australia: Role of the East Australian Current

机译：澳大利亚东南部温带地区热带鱼的发生：东澳大利亚洋流的作用

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Dispersal of larval propagules is the major mechanism facilitating connectivity of marine populations. However, only a fraction of larvae settle in suitable habitat. For coral reef fishes, many larvae are advected away from coral reefs, often despite strong behavioural mechanisms (including swimming), and some may travel long distances away from the tropics. Here we document the occurrence of tropical reef fishes along the southeast coast of Australia between 2003 and 2005 and evaluate the role of the East Australian Current (EAC) in driving this pattern. In total we observed 47 species of tropical fishes from 11 families during the summer recruitment season (January to May) at locations spanning most of the length of the New South Wales coast (28° S-37.5° S latitude, ～ 1700km from the southern end of the Great Barrier Reef). Southern locations tended to have reduced richness and density relative to northern ones. In general, the southward extent of distribution of the most commonly observed species was well explained by their planktonic larval durations. Recruitment events tended to be much more episodic in Merimbula (37° S) than Sydney (34° S), but there was little evidence for interannual similarity in the spatial patterns of recruitment of individual species with exception of the numerical dominance of Abudefduf vaigiensis and Abudefduf sexfasciatus (Pomacentridae) at the Sydney location and of Chaetodon auriga and Chaetodon flavirostris (Chaetodontidae) at the Merimbula location. Despite strong evidence for the role of the EAC in the transport of these species at a coastal scale, we found little evidence that individual recruitment events were correlated with local increases in water temperature that would be associated with EAC ingress.
机译：传播幼体繁殖体是促进海洋种群连通的主要机制。但是，只有一小部分幼虫栖息在合适的栖息地中。对于珊瑚礁鱼类，尽管有强大的行为机制（包括游泳），但许多幼体通常远离珊瑚礁而被平移，有些可能远离热带地区。在这里，我们记录了2003年至2005年之间澳大利亚东南沿海热带珊瑚鱼的发生，并评估了东澳大利亚洋流（EAC）在推动这种模式中的作用。总体上，我们在夏季募集季节（1月至5月）观察到了来自11个科的47种热带鱼，分布在新南威尔士州海岸大部分地区（北纬28°至37.5°，距南部约1700公里）大堡礁尽头）。南部地区的富裕度和密度往往低于北部地区。总的来说，最常见的物种向南分布的程度可以用其浮游幼虫的持续时间很好地解释。 Merimbula（37°S）的招募事件往往比悉尼（34°S）的事件多，但几乎没有证据表明单个物种招募的空间格局具有年际相似性，但Abudefduf vaigiensis和位于悉尼的Abudefduf sexfasciatus（Pomacentridae）和位于Merimbula的Chaetodon auriga和Chaetodon flavirostris（Chaetodontidae）。尽管有充分的证据表明EAC在沿海规模的这些物种的运输中所起的作用，但我们发现几乎没有证据表明单个募集事件与EAC进入有关的局部水温升高有关。

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