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首页> 外文期刊>Marine ecology progress series >Location influences size-selective predation on newly settled reef fish
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Location influences size-selective predation on newly settled reef fish

机译：位置影响新定居珊瑚鱼的大小选择捕食

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摘要

Demersal fish usually settle to established fish assemblages that include suites of gape-limited predators, whose compositions vary among locations. We investigated the extent to which predation was size-selective on a species of newly settled coral reef fish, the damselfish Pomacentrus amboinensis (Bleeker 1868), among 3 lagoonal sites on 1 reef. The 3 sites at Lizard Island, Great Barrier Reef, Australia, differed in species composition and relative abundance of predators. Fish at the end of their larval phase were caught in light traps and tattooed for individual recognition. They were then paired so that there was a 1 mm difference between partners, and placed on small patch reefs at the base of the 3 shallow lagoonal sites. Large individuals survived significantly better than small individuals in 1 out of 3 sites. One site displayed the reverse trend, even though non-significant, and the third site showed no evidence of selection. Selection was strongest at the site where predators of small reef fishes were in highest densities and water currents were strongest. Strong water currents appeared to emphasise size-related differences in swimming ability and increase the vulnerability of small fish at this site. Our results suggested that the occurrence of size-selection for this species at settlement will depend on the composition of the predator assemblage and prevailing environmental conditions; these both interact with the performance attributes of prey, and all 3 variables may be location-specific.
机译：底栖鱼类通常定居于已建立的鱼类组合中，其中包括成组的，有限的捕食者，其组成因位置而异。我们调查了在1个礁石上的3个泻湖地点中，一种新定居的珊瑚礁鱼（该死的自家的Pomacentrus amboinensis（Bleeker 1868））对捕食的大小选择的程度。澳大利亚大堡礁蜥蜴岛的3个地点的物种组成和相对丰富的捕食者有所不同。幼虫阶段结束时将鱼捕获在光阱中并刺上纹身以供个人识别。然后将它们配对，以使伴侣之间相差1毫米，并放置在3个浅泻湖点的底部的小块礁上。在3个地点中，有1个大个体的生存要比小个体好得多。一个站点显示出相反的趋势，即使不显着，而第三站点则没有选择的迹象。在小礁鱼的捕食者密度最高，水流最强的地方，选择最强。强烈的水流似乎强调了与大小有关的游泳能力差异，并增加了该地点小鱼的脆弱性。我们的结果表明，该物种在定居点的大小选择的发生将取决于捕食者组合的组成和主要的环境条件。这些都与猎物的性能属性相互作用，并且所有三个变量可能是特定于位置的。

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