Transport of larvae and detritus across the surf zone of a steep reflective pocket beach
Transport of larvae and detritus across the surf zone of a steep reflective pocket beach
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幼虫和碎屑在陡峭的反光口袋海滩的冲浪区中运输
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Griesemer
中科院分区：
文献类型：
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作者：
A. Shanks;J. MacMahan;S. Morgan;A. Reniers;Marley Jarvis;Jenna A. Brown;A. Fujimura;C. Griesemer
许多潮间带物种的幼虫在近海发展，必须穿过碎波带才能完成向岸上迁移到成年栖息地。根据水动力学，碎波带可能会限制这种迁移，特别是在反射的岩石海岸。作为一个逻辑上易于处理的模拟岩石海岸环境，我们进行了全面的生物和物理研究的水动力学陡峭的反射桑迪海滩。全浮游生物和precompetent幼虫无脊椎动物丰富的冲浪区内比近海，其浓度内和外的冲浪区没有显着相关性，这表明他们没有进入冲浪区。在碎波带外缘的整个水柱中持续的离岸流可能会阻止这些生物进入碎波带。相比之下，碎屑和主管幼虫无脊椎动物（即Cyprids）的浓度，而也没有显着相关的离岸浓度，往往更集中在碎波区比离岸。碎波带内，碎屑的浓度显着相关的浓度主管幼虫无脊椎动物（藤壶，腹足类，多毛类，bopyrid端足类）和生物体，可能与碎屑（端足类和harpacticoid桡足类）。这些浓度与平均日波高呈显著负相关。我们假设，碎屑和幼虫进入近底的近底流的过程中，在平静的波浪条件下的碎波区。近底流与所有冲浪区，并可能是一个一般的机制，靠近海岸的幼体陆上运输。
Larvae of many intertidal species develop offshore and must cross the surf zone to complete their onshore migration to adult habitats. Depending on hydrodynamics, the surf zone may limit this migration, especially on reflective rocky shores. As a logistically tractable analog of a rocky shore environment, we carried out a comprehensive biological and physical study of the hydrodynamics of a steep reflective sandy beach. Holoplankton and precompetent larval invertebrates were much less abundant within the surf zone than offshore, and their concentrations inside and outside the surf zone were not significantly correlated, suggesting that they were not entering the surf zone. Persistent offshore flow throughout the water column at the outer edge of the surf zone may prevent these organisms from entering the surf zone. In contrast, the concentrations of detritus and a competent larval invertebrate (i.e. cyprids), while also not significantly correlated with concentrations offshore, were frequently more concentrated in the surf zone than offshore. Within the surf zone, the concentration of detritus was significantly correlated with concentrations of competent larval invertebrates (barnacles, gastropods, polychaetes, and bopyrid amphipod) and organisms that may be associated with detritus (amphipods and harpacticoid copepods). These concentrations were significantly negatively correlated with average daily wave height. We hypothesize that detritus and larvae enter the surf zone near the bottom during calm wave conditions by a process of near-bottom streaming. Near-bottom streaming is associated with all surf zones and may be a general mechanism for onshore transport of larvae close to the coast.
影响因子：
2.9
作者：
J. MacMahan;Jeff L. Brown;Jenna A. Brown;E. Thornton;A. Reniers;T. Stanton;M. Henriquez;E. Gallagher;J. Morrison;M. Austin;T. Scott;N. Sénéchal
通讯作者：
J. MacMahan;Jeff L. Brown;Jenna A. Brown;E. Thornton;A. Reniers;T. Stanton;M. Henriquez;E. Gallagher;J. Morrison;M. Austin;T. Scott;N. Sénéchal