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Tidal migration and cross-habitat movements of fish assemblage within a mangrove ecotone

机译：红树林过渡带内鱼类种群的潮汐迁徙和跨栖息地运动

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Patterns of fish movement across tidal cycles within mangroves remain a poorly understood topic. The scarcity of such information may be the result of the difficulty in sampling these habitats in meso-and macrotidal areas. Here, we attempted to gain a thorough understanding of fish cross-habitat movements and their migration patterns along tidal cycles by characterizing the structural roles that different mangrove microhabitats (e.g. forest and adjacent estuarine habitat) may have on fish assemblages. To achieve this, we placed underwater wide-angle cameras at different positions within the mangrove ecotone and sampled along entire tidal cycles within 15 mangrove habitats located along the Brazilian central coast. Our results showed that sequential patterns of fish occupancy (i.e. identity, diversity and abundance) were coupled to microhabitat characteristics, and those were contingent on the prevalent tidal stages. We observed clear species-specific associations forming distinct subassemblages along a tidal cycle. Mangrove edges, rather than any other habitat types, were pathways of fish migration. Our results revealed that, as a whole, the mangrove ecotone is used by the entire fish assemblage and that tidal cycles lead to sequential microhabitats use having strong structuring roles and leading to predictable subassemblages recombination. Such distinct "assemblage-microhabitat" couplings along tidal cycles highlight important interactive effects that these variables may have on migratory and fish behavioural patterns. Overall, we highlight that within mangroves, the benefits that fish receive from sequential microhabitat are highly context dependant and clearly reflect tidal effects.
机译：鱼类在红树林内跨潮周期运动的方式仍然是一个鲜为人知的话题。这种信息的缺乏可能是由于难以在中潮汐和大型潮汐地区采样这些栖息地的结果。在这里，我们试图通过描述不同的红树林微生境（例如森林和邻近的河口生境）可能对鱼群产生的结构性作用来全面了解鱼类跨生境运动及其在潮汐周期中的迁移模式。为了实现这一目标，我们在红树林过渡带内的不同位置放置了水下广角照相机，并在位于巴西中部海岸的15个红树林栖息地的整个潮汐周期中进行了采样。我们的结果表明，鱼类的居住模式（即同一性，多样性和丰度）的顺序模式与微生境特征相关联，并且这些模式取决于流行的潮汐阶段。我们观察到明确的物种特定的关联，形成沿潮汐周期的不同子组合。红树林边缘而不是其他任何栖息地类型都是鱼类迁移的途径。我们的结果表明，总体而言，整个鱼类种群都使用了红树林过渡带，并且潮汐周期导致了具有一定结构作用的顺序微生境的使用，并导致了可预测的亚种群重组。沿潮汐周期的这种独特的“组合-微栖息地”耦合突显了这些变量可能对迁徙和鱼类行为方式产生的重要相互作用。总体而言，我们强调指出，在红树林中，鱼类从连续的微生境中获得的利益在很大程度上取决于环境，并清楚地反映了潮汐影响。

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  • 来源
    《Marine biology》 |2016年第5期|111.1-111.13|共13页
  • 作者

    Reis-Filho Jose Amorim; Giarrizzo Tommaso; Barros Francisco;

  • 作者单位

    Univ Fed Bahia, Lab Ecol Benton, Campi Ondina, BR-40170000 Salvador, BA, Brazil|ECUS Inst, Educ Sci & Socioenvironm Util, BR-41940250 Salvador, BA, Brazil;

    Fed Univ Para, Lab Biol Pesqueira Manejo Recursos Aquat, BR-66040170 Belem, Para, Brazil;

    Univ Fed Bahia, Lab Ecol Benton, Campi Ondina, BR-40170000 Salvador, BA, Brazil;

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