Spatial variability in habitat associations of pre- and post-settlement stages of coral reef fishes at Ishigaki Island, Japan
Spatial variability in habitat associations of pre- and post-settlement stages of coral reef fishes at Ishigaki Island, Japan
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DOI：
10.1007/s00227-009-1257-3
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发表时间：
2009-10-01
期刊：
影响因子：
2.4
通讯作者：
Watanabe, Yoshiro
中科院分区：
文献类型：
--
作者：
Nakamura, Yohei;Shibuno, Takuro;Watanabe, Yoshiro
缩短沉降期可能会促进中上层鱼类幼体成功定居到底栖幼鱼栖息地，因为这限制了幼体在新栖息地中遭受捕食的机会。由于海洋鱼类幼虫在定居前和定居期间的空间分布尚不清楚，因此在石垣岛（日本）利用光陷阱采样和水下视觉带样线调查进行了实地实验，以调查选定的定居前后鱼类（棘鱼科、Pomacentridae、Chaetodonidae 和 Lethrinidae）在四种栖息地（海草床、珊瑚碎石、分支珊瑚和板状珊瑚）中的空间分布模式。结果突出了两种模式：模式1，定居前和定居后个体在四个栖息地（Acanthuridae）中普遍分布；模式2，定居前个体分布在所有栖息地，但定居后个体仅限于珊瑚（大多数Pomacentridae和Chaetodontidae物种）或海草栖息地（Lethrinidae）。第一种模式最大限度地减少了幼虫浮游阶段和获得底栖珊瑚礁栖息地之间的过渡时间，后者立即导致幼虫生活方式。相比之下，第二种模式的特点是幼虫对定居生境的高选择性和/或定居后死亡率的差异。
Successful settlement of pelagic fish larvae into benthic juvenile habitats may be enhanced by a shortened settlement period, since it limits larval exposure to predation in the new habitat. Because the spatial distribution of marine fish larvae immediately prior to settlement versus during settlement was unknown, field experiments were conducted at Ishigaki Island (Japan) using light trap sampling and underwater visual belt transect surveys to investigate the spatial distribution patterns of selected pre- and post-settlement fishes (Acanthuridae, Pomacentridae, Chaetodonidae and Lethrinidae) among four habitats (seagrass bed, coral rubble, branching coral and tabular coral). The results highlighted two patterns: patterns 1, pre- and post-settlement individuals showing a ubiquitous distribution among the four habitats (Acanthuridae) and pattern 2, pre-settlement individuals distributed in all habitats, but post-settlement individuals restricted to coral (most species of Pomacentridae and Chaetodontidae) or seagrass habitats (Lethrinidae). The first pattern minimizes the transition time between the larval pelagic stage and acquisition of a benthic reef habitat, the latter leading immediately to a juvenile lifestyle. In contrast, the second pattern is characterized by high settlement habitat selectivity by larvae and/or differential mortality immediately after settlement.