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Contrasting effects of habitat complexity and connectivity on biodiversity in seagrass meadows

机译：生境复杂性和连通性对海草草甸生物多样性的对比影响

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Variability in habitat positioning within seascapes (over kilometres) influences fauna assemblage composition, but the characteristics of a habitat patch (10-100s of metres) influence how species use that patch and how variable assemblages are within habitats. Understanding the relative influence of these two contrasting scales is crucial to improving the management of marine habitats. We used baited remote underwater video systems (BRUVS) to quantify seagrass fish assemblages, and took seagrass cores to quantify seagrass metrics, at ten sites across three seasons in Moreton Bay, Australia to determine if fish are influenced more by seascape context or metrics of seagrass habitat complexity. We found that fish species richness and assemblage composition are most influenced by large-scale variability in seascape (e.g. proximity to ocean and mangroves). However, variability in habitat complexity (e.g. seagrass blade length and density) and proximity to mangrove forests had the greatest effect on assemblage beta diversity. Connectivity with other habitats plays a vital role in structuring the fish community, as it is crucial for daily feeding excursions (mangrove forests) and spawning/reproduction (proximity to ocean). Continuous, non-patchy seagrass beds are however vital to how individuals use a seagrass meadow, with beta diversity being higher in seagrass meadows that were less patchy. Identifying how habitat attributes and context influence fish assemblages is vital for optimizing conservation initiatives. Therefore, we suggest that monitoring populations with biodiversity metrics such as beta diversity can be effective in determining areas that are critical for conservation.
机译：海景中栖息地定位的变化（超过一公里）会影响动物群落的组成，但是栖息地斑块（10-100米）的特征会影响物种如何使用该斑块以及栖息地中的组合种群如何变化。了解这两个相对尺度的相对影响对于改善海洋生境的管理至关重要。我们使用诱饵的远程水下视频系统（BRUVS）来量化海草鱼的种群，并利用海草核心量化海草的指标，在​​澳大利亚摩顿湾的三个季节的十个站点中，确定鱼是否受海景环境或海草指标的影响更大生境的复杂性。我们发现鱼类种类的丰富度和组合组成受海景大规模变化的影响最大（例如靠近海洋和红树林）。但是，栖息地复杂性（例如海草叶片的长度和密度）的变化性以及与红树林的接近程度对组合β多样性的影响最大。与其他栖息地的连通性在构建鱼类群落中起着至关重要的作用，因为这对于日常的喂食游览（红树林）和产卵/繁殖（邻近海洋）至关重要。但是，连续的，不斑驳的海草床对于个人如何使用海草草甸至关重要，β多样性在斑块较少的海草草甸中较高。识别栖息地属性和环境如何影响鱼类种群对于优化保护措施至关重要。因此，我们建议用诸如β多样性之类的生物多样性指标监测种群可以有效地确定对保护至关重要的地区。

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  • 来源
    《Marine biology》 |2017年第5期|117.1-117.9|共9页
  • 作者

    Henderson Christopher J.; Gilby Ben L.; Lee Shing Y.; Stevens Tim;

  • 作者单位

    Griffith Univ, Australian Rivers Inst, Coasts & Estuaries, Gold Coast Campus, Gold Coast, Qld 4222, Australia|Griffith Univ, Griffith Sch Environm, Gold Coast Campus, Gold Coast, Qld 4222, Australia;

    Univ Sunshine Coast, Sch Sci & Engn, Maroochydore, Qld 4558, Australia;

    Griffith Univ, Australian Rivers Inst, Coasts & Estuaries, Gold Coast Campus, Gold Coast, Qld 4222, Australia|Griffith Univ, Griffith Sch Environm, Gold Coast Campus, Gold Coast, Qld 4222, Australia;

    Griffith Univ, Australian Rivers Inst, Coasts & Estuaries, Gold Coast Campus, Gold Coast, Qld 4222, Australia|Griffith Univ, Griffith Sch Environm, Gold Coast Campus, Gold Coast, Qld 4222, Australia;

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