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首页> 外文期刊>Journal of Marine Research >The effects of seagrass patch size and energy regime on growth of a suspension-feeding bivalve
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The effects of seagrass patch size and energy regime on growth of a suspension-feeding bivalve

机译：海草斑块大小和能量状况对悬浮饲料双壳类动物生长的影响

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摘要

An investigation of how the presence of seagrass and seagrass patch size in high- and low-energy environments affected growth of an infaunal bivalve (hard clam, Mercenaria mercenaria) was carried out. Two general size classes of clams were used, mean length ca. 40.0 mm (41.9 mm) and mean length ca. 20.0 mm (22.3 mm and 19.0 mm), to see if growth responses were the same for large- and small-sized clams. Seagrass density, length and species composition as well as sediment characteristics were measured at high- and low-energy sites to determine if changes in seagrass and/or sediment dynamics could explain observed growth patterns. The incidence of siphon cropping was also evaluated as a potential influence on clam growth. Large clams grew faster inside than outside vegetation at both high- and low-energy sites. Within the vegetation, growth of large clams was faster in medium-sized patches of seagrass (2-3 m across) than in small patches (1 m across) and was intermediate in large patches ( > 4-5 m across). There was no apparent correlation between seagrass shoot density, blade length, or species composition and growth of clams in patches of different size. Growth of small clams (22.3 mm) within seagrass was independent of the two seagrass patch sizes tested (large vs. small), but did vary among sites. Growth of clams was not correlated with differences in shoot density, blade length or species composition among sites. Growth of small clams (19.0 mm) also varied with energy regime and with presence/absence of vegetation. Small clams grew significantly more within seagrass under both high- and low-energy conditions, but the effect was more pronounced at high-energy sites than at low. Seagrass shoot density, blade length, and species composition did not vary between high and low energy regimes, but did vary among sites from the beginning to the end of the experiment. Long-term averages of sediment stability based on grain size characteristics suggest that the baffling effect of seagrass varies greatly with energy regime.
机译：研究了高能和低能环境中海草和海草斑块大小的存在如何影响不育双壳类动物（硬蛤，Mercenaria mercenaria）的生长。使用了两种一般大小的蛤classes，平均长约。 40.0毫米（41.9毫米），平均长度约20.0毫米（22.3毫米和19.0毫米），以查看大号和小号蛤s的生长反应是否相同。在高能和低能场所测量海草密度，长度和物种组成以及沉积物特征，以确定海草的变化和/或沉积物动力学是否可以解释观察到的生长方式。虹吸作物的发生率也被评估为对蛤类生长的潜在影响。在高能和低能场所，大蛤inside的内部生长快于外部植被。在植被中，中型海草斑块（跨度为2-3 m）比小斑块（跨度为1 m）中大蛤的生长更快，在大斑块（跨度为> 4-5 m）中中等。在不同大小的斑块中，海草枝条密度，叶片长度或物种组成与蛤的生长之间没有明显的相关性。海草中小蛤（（22.3毫米）的生长与所测试的两种海草斑块大小（大与小）无关，但在不同地点之间确实有所不同。蛤的生长与地点之间枝条密度，叶片长度或物种组成的差异无关。小蛤（（19.0毫米）的生长也随能量状况以及有无植被而变化。在高能和低能条件下，小草在海草中的生长明显更多，但是在高能位点的影响比低能位更为明显。在高能和低能方案下，海草枝条密度，叶片长度和物种组成均没有变化，但从实验的开始到结束，各部位之间的变化均不相同。基于粒度特征的沉积物稳定性的长期平均值表明，海草的折流效应随能量方案而变化很大。

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  • 来源
    《Journal of Marine Research》 |1996年第1期|p.161-185|共25页
  • 作者

    E. A. Irlandi;

  • 作者单位

    University of Miami, Rosenstiel School of Marine and Atmospheric Sciences, Center for Marine and Environmental Analyses, 4600 Rickenbacker Causeway, Miami, Florida, 33149, U.S.A.;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水文科学（水界物理学）;
  • 关键词

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