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Spatial differences in larval abundance within the coastal boundary layer impact supply to shoreline habitats

机译:沿海边界层内幼虫丰度的空间差异影响到海岸线生境的供应

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摘要

Explorations of the dynamics of nearshore regions of the coastal zone are missing from many efforts to understand larval transport and delivery to suitable habitats. Larval distributions in the coastal ocean are variable and depend on physical processes and larval behaviors, leading to biophysical interactions that may increase larval retention nearshore and bolster their return to natal sites. While recent evidence suggests that many larvae are retained within a few kilometers from shore, few studies incorporate measurements sufficiently close to shore to plausibly assess supply to the shoreline benthos. We measured cross-shore distributions of larvae of benthic crustaceans between 250 and 1100 m from shore (i.e. just beyond the surf zone) within the coastal boundary layer (CBL) - a region of reduced alongshore flow - and simultaneously quantified a suite of physical factors that may influence larval distributions. We found high larval abundance within the CBL, with a peak at 850 m from shore, and a decrease in abundance along the shoreward edge of the sampled transect. We also found distinctly different larval assemblages at outer stations within the CBL, as compared to inner stations that are more influenced by shoreline dynamics. These patterns persisted across sample dates, suggesting that the spatial structure of nearshore larval assemblages is at least somewhat robust to temporal changes in physical conditions. Thus, while larval abundance appears to be high within the CBL, larvae appear to be sparse within the narrow band of water adjacent to the surf zone. Low larval supply adjacent to suitable habitats has important implications for the coupling of supply and recruitment, and resulting dynamics of shoreline populations.
机译:为了解幼体运输和向适当栖息地的运输所做的许多努力,都缺少对沿海地区近岸地区动态的探索。沿海海洋中的幼虫分布是可变的,并取决于物理过程和幼虫行为,从而导致生物物理相互作用,这可能会增加近岸幼虫的滞留并促进其返回出生地。尽管最近的证据表明许多幼虫被保留在离海岸几公里的范围内,但很少有研究结合足够靠近海岸的测量值来合理地评估向海岸线底栖生物的供应。我们测量了海岸边界层(CBL)(沿岸水流减少的区域)内距海岸(即刚好超过冲浪区)250至1100 m之间的底栖甲壳类幼体的跨岸分布,同时量化了一系列物理因素可能会影响幼虫的分布。我们发现CBL内的幼虫丰度很高,在距海岸850 m处有一个峰值,而沿采样样带的岸边丰度降低。我们还发现,与受海岸线动态影响更大的内部站点相比,CBL外部站点的幼虫组合明显不同。这些模式在整个采样日期都持续存在,这表明近岸幼虫组合的空间结构对物理条件的时间变化至少具有一定的鲁棒性。因此,尽管在CBL内幼虫的丰度很高,但在靠近冲浪区的狭窄水带内,幼虫似乎稀疏。靠近适当栖息地的幼虫供应量低,对供应和募集的耦合以及由此引起的海岸线种群动态具有重要意义。

著录项

  • 来源
    《Marine ecology progress series》 |2013年第4期|191-203|共13页
  • 作者单位

    Bodega Marine Laboratory, University of California at Davis, Bodega Bay, California 94923, USA,Hopkins Marine Station, Stanford University, Pacific Grove, California 93950, USA;

    Bodega Marine Laboratory, University of California at Davis, Bodega Bay, California 94923, USA;

    Bodega Marine Laboratory, University of California at Davis, Bodega Bay, California 94923, USA,Department of Evolution and Ecology, University of California at Davis, Davis, California 95616, USA;

    Bodega Marine Laboratory, University of California at Davis, Bodega Bay, California 94923, USA,Department of Environmental Science and Policy, University of California at Davis, Davis, California 95616, USA;

    Bodega Marine Laboratory, University of California at Davis, Bodega Bay, California 94923, USA,Department of Environmental Science and Policy, University of California at Davis, Davis, California 95616, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dispersal; Invertebrate larvae; Retention; Nearshore; Transport;

    机译:分散;无脊椎动物的幼虫;保留;近岸;运输;

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