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首页> 外文期刊>Estuarine Coastal and Shelf Science >Changes in reef fish assemblages in a cross-shelf euphotic-mesophotic gradient in tropical SW Atlantic
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Changes in reef fish assemblages in a cross-shelf euphotic-mesophotic gradient in tropical SW Atlantic

机译：在热带SW大西洋的跨架euphotic-中间光学梯度中礁鱼组合的变化

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摘要

Despite a vast number of studies about shallow reef fish assemblages, and an increasing amount of studies about mesophotic ones, there are very few cross-shelf assessments including both, shallow and mesophotic depths. Herein, we analyze changes in reef fish assemblages in a cross-shelf euphotic-mesophotic (19-72.6 m) gradient in tropical SW Atlantic. Data was obtained using a novel low-cost 360 degrees stationary video system. Sixty-four species from thirty families were identified. Depth, distance offshore and proportion of consolidated substrate were the main predictors of fish assemblages' structure. Four distinct fish assemblages were identified across the depth gradient (20-30, 30-40, 40-50 and 50-75 m), with marked shifts in composition, abundance, and trophic structure. Abundance of invertebrate feeders and large roving herbivores declined across the shelf and with increasing depth, while abundance of planktivores and piscivores increased, particularly below 50 m. These changes were likely caused by changes in food availability and habitat suitability. Our low-cost video system yielded high-resolution images that enabled us to accurately survey reef fish assemblages, being therefore a useful method for studies focusing on both, euphotic and mesophotic reef ecosystems. Our results contribute to a better understanding of how reef fish assemblages change with increasing depth in SW Atlantic reefs and corroborate the idea that the breakpoint between euphotic and mesophotic fish assemblages is contextdependent rather than previously defined as 30 m depth.
机译：尽管有大量关于浅礁鱼组合的研究，但越来越多的患蛋白光学的研究，跨货架评估很少，包括浅和中间光学深度。在此，我们分析热带SW大西洋的横架Euphotic-中间光学（19-72.6米）梯度中礁鱼组合的变化。使用新颖的低成本360度固定视频系统获得数据。确定了来自三十个家庭的六十四种。深度，距离近海和合并基材的比例是鱼组合结构的主要预测因子。在深度梯度（20-30,30-40,40-50和50-75M）上鉴定了四种不同的鱼类组合，在组成，丰度和营养结构中具有标记的变化。丰富的无脊椎动物饲养者和大型粗纱食草动物在架子上下降并随着深度的增加，综合性和柱子的丰富增加，特别是低于50米。这些变化可能是由食品可用性和栖息地适用性的变化引起的。我们的低成本视频系统产生了高分辨率的图像，使我们能够准确地调查礁鱼组合，因此是一种专注于两者，Euphotic和脱蛋白礁生态系统的有用方法。我们的结果有助于更好地了解Reef Fish组合如何随着SW Atlantic Reefs的增加而变化，并证实了Euphotic和Mesophot鱼类组合之间断裂点是上下依赖而非先前定义为30米深度的观点。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2021年第30期|107465.1-107465.11|共11页
  • 作者

    Silva M. B.; Rosa R. S.; Menezes R.; Francini-Filho R. B.;

  • 作者单位

    Univ Fed Paraiba Programa Posgrad Ciencias Biol Ctr Ciencias Exatas & Nat BR-58051900 Joao Pessoa Paraiba Brazil;

    Univ Fed Paraiba Dept Sistemat & Ecol Ctr Ciencias Exatas & Nat BR-58051900 Joao Pessoa Paraiba Brazil;

    Univ Fed Paraiba Programa Posgrad Ciencias Biol Ctr Ciencias Exatas & Nat BR-58051900 Joao Pessoa Paraiba Brazil;

    Univ Sao Paulo Ctr Biol Marinha CEBIMar BR-11612109 Sao Sebastiao SP Brazil;

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  • 关键词

    Brazil; Video census system; Mesophotic coral ecosystems; Trophic guilds;

    机译：巴西;视频人口普查系统;患蛋白光珊瑚生态系统;营养业会议;

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