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首页> 外文期刊>Marine ecology progress series >Mangrove fish assemblages reflect the environmental diversity of the Galapagos Islands
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Mangrove fish assemblages reflect the environmental diversity of the Galapagos Islands

机译：红树林渔民组合反映了加拉帕戈斯群岛的环境多样性

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摘要

Mangroves are important habitats for a variety of ecologically, commercially and culturally important fishes. However, little is known about their role within the Tropical Eastern Pacific (TEP), and particularly in the Galapagos Archipelago, the westernmost limit for mangroves in the Americas, and the only oceanic islands in the TEP where mangroves are present. We describe patterns of fish composition in the 2 Galapagos bioregions where mangroves are present and assess potential environmental factors influencing fish community composition. Underwater Visual Census and Stereo Baited Remote Underwater Video stations (stereo-BRUVS) were used to sample fish communities. We identified 35 029 fish representing 93 species, 67 genera and 36 families. Pomacentridae, Mugilidae, Haemulidae and Lutjanidae were the most common families. Juveniles made up 43% of the fish, 30 species were of importance to local artisanal fisheries and 80% of species were associated with reef habitats, suggesting mangroves in Galapagos may provide nursery habitats for economically valued species. Fish assemblage composition varied across bioregions, with 6 taxa responsible for driving these differences, including species of economic importance: Lutjanus novemfasciatus and Mycteroperca olfax. Species richness was 17% higher in the Central-Southeastern than in the Western region; while higher species richness, Shannon-Wiener diversity and Pielou's evenness were detected with BRUVS than through visual censuses. Our results highlight the role of mangroves as a habitat for a unique fish community composed of young, endemic and commercially important species, whose composition is likely driven by the isolation of the islands and its location in a convergence zone.
机译：红树林是各种生态，商业和文化重要的鱼类的重要栖息地。然而，关于他们在热带东部（TEP）内的角色知之甚少，特别是在加拉帕戈斯群岛，美洲红树林最受限公司，以及红树林所在的TEP中唯一的海洋岛屿。我们描述了2个Galapagos生物导致的鱼组合物的模式，并评估影响鱼群组成的潜在环境因素。水下视觉人口普查和立体声诱饵远程水下视频站（立体声Bruvs）用于样品群落。我们确定了35 029条鱼，代表93种，67种属和36个家庭。 Pomacentridae，Mugilidae，Haemulidae和Lutjanidae是最常见的家庭。青少年占鱼类的43％，30种对当地手工渔业的重要性，80％的物种与珊瑚礁栖息地有关，暗示加拉帕戈斯的美洲红树可能为经济价值的物种提供苗圃栖息地。鱼类组合组成在生物导致中变化，6个征集负责驱动这些差异，包括经济物种：Lutjanus novemfasciatus和Mycteroperca olfax。中环大东南部的物种丰富度比西部地区高17％;虽然物种较高的丰富性，但是，使用Bruvs而不是通过视觉普查检测Shannon-Wiener多样性和Pielou的均匀性。我们的结果突出了红树林作为一种栖息地的作用，该栖息地由年轻，流行和商业上重要的物种组成的独特鱼群，其组成可能是通过岛屿的隔离和其在收敛区中的位置驱动。

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