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首页> 外文期刊>Journal of Ocean University of China >The Sediment and Hydrographic Characteristics of Three Horseshoe Crab Nursery Beaches in Hong Kong
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The Sediment and Hydrographic Characteristics of Three Horseshoe Crab Nursery Beaches in Hong Kong

机译：的沉积物和水文特征在香港三个马蹄蟹托儿所海滩

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摘要

Horseshoe crab juveniles have been recorded from sand and sandy-mud nursery beaches at Pak Nai (western New Territories), San Tau and Shui Hau (Lantau Island), Hong Kong. In order to provide a better understanding of these beaches and to identify those plausible factors which have made them preferred by spawning horseshoe crabs, environmental parameters, including temperature, salinity, pH and dissolved oxygen content of the water, and particle size distribution and organic matter content of the sediments at the three sites, were determined and compared. The hydrographic and sediment data obtained for the three study sites have revealed some common environmental features. The three nursery beaches are relatively remote, and far (in Hong Kong terms) from urbanized and densely populated areas. The beaches are generally well sheltered from strong wave action and inundated regularly by estuarine waters. Horseshoe crab adults tend to select these beaches for spawning as their protected features ensures the laid eggs are less likely to be washed out of the sand, and hatched juveniles can feed on the meiofauna and grow. Sediments of the three beaches largely comprise medium-sized sand particles and are moderately sorted, suggesting medium porosity and good water permeability. Such a sand type, with the generally high oxygen levels in incursing waters, may help create a well-oxygenated micro-environment for the normal development of horseshoe crab eggs, larvae and juveniles. Lantau Island beaches at San Tau and Shui Hau are relatively free from organic pollution, as reflected in generally high dissolved oxygen level, and low BOD_5 and ammonia nitrogen values. Pak Nai is, however, more polluted.
机译：马蹄蟹幼体有记录沙子和sandy-mud托儿所海滩在白泥(西部新领土),圣知道水和你(大屿山),香港。这些海滩和更好的理解识别那些似是而非的因素他们喜欢通过产卵马蹄蟹,环境参数,包括温度、盐度、pH值和溶解氧的内容水,粒度分布和有机在三个沉积物的重要内容网站,测定和比较。水文泥沙数据获得的三个研究揭示了一些常见的网站环境特性。相对偏远,远(在香港吗从城市化和人口密集的计算)区域。定期从强大的波浪作用和淹没河口水域。选择这些海滩产卵的保护功能,保证了不下蛋可能被淘汰的沙子,和孵化青少年可以在较小型底栖生物饲料和成长。海滩沉积物的三大部分组成中型砂粒子和适度排序,显示介质孔隙度和良好的水渗透率。通常高含氧量增加水域,可以帮助创建一个氧化微环境的正常发展马蹄蟹卵、幼虫和青少年。在圣岛海滩τ和水Hau从有机污染,相对自由通常反映在高溶解氧水平,低BOD_5和氨氮值。白泥是,然而,更多的污染。

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