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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Coral bioerosion by the sea urchin Diadema setosum in Hong Kong: Susceptibility of different coral species
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Coral bioerosion by the sea urchin Diadema setosum in Hong Kong: Susceptibility of different coral species

机译：香港海胆水蚤Diadema setosum对珊瑚的生物侵蚀：不同珊瑚物种的敏感性

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摘要

This study examined coral bioerosion by the sea urchin Diadema setosum at 8 sites along a north-south direction in Hong Kong. Bioerosion rate, estimated from urchin density, size distribution, gut turnover rate and CaCO_3 in gut content, varied from 0.12 to 0.66 kg CaCO_3 m~(-2) yr~(-1). The highest bioerosion rate and D. setosum density occurred at Moon Island, Hoi Ha Wan (HHW) Marine Park. There was no evidence of segregation by D. setosum on a particular substratum. However, of all D. setosum found on corals, a large percentage (62%) was found on the two dominant coral genera Platygyra and Porites. A laboratory experiment was thus run to compare the relative susceptibility of Platygyra camosus and Porites lutea, two dominant species of massive corals with different porosity and skeletal density, to urchin grazing. The urchins eroded 3.3 times more dead P. camosus skeleton and 3.6 times more dead P. lutea than the live coral of the corresponding species. Bioerosion of P. camosus was also >3 times higher than that of P. lutea for both live corals and dead skeleton, which was further confirmed by a higher amount of inorganic content in the feces of D. setosum feeding on P. camosus than those feeding on P. lutea. Cover of fouling organisms (mainly turf algae) on the dead skeleton was greatly reduced in both species (-49% in P. camosus and -38% in P. lutea). Our study has provided clear evidence that D. setosum is effective in reducing algal growth as well as causing coral bioerosion, especially the more porous and less dense P. camosus. The results were consistent with the field observation of severe coral damage at HHW where P. camosus dominated the community, and indicated an urgent need for management action to reduce coral bioerosion at the site with a high density of D. setosum.
机译：这项研究在香港南北方向的8个地点研究了海胆Diadema setosum对珊瑚的生物侵蚀作用。根据海胆密度，大小分布，肠道周转率和肠道内CaCO_3估算的生物侵蚀率在0.12至0.66 kg CaCO_3 m〜（-2）yr〜（-1）之间变化。最高的生物侵蚀速率和D. setosum密度发生在海下湾海洋公园的月亮岛。没有证据表明Setosum在特定的基质上分离。但是，在珊瑚中发现的所有D. setosum中，在两个主要的珊瑚属Platygyra和Porites中发现了很大一部分（62％）。因此，进行了一项室内实验，比较了鸭嘴兽和两种不同孔隙度和骨架密度的优势珊瑚大头藻Platygyra camosus和Porites lutea对野孩子放牧的相对敏感性。与相应物种的活珊瑚相比，海胆侵蚀的死僵尸骨骼比死去的骨骼藻多3.3倍，死的黄褐斑比后者多3.6倍。活珊瑚和死骨骼的变形假单胞菌的生物侵蚀也比卢氏假单胞菌高> 3倍，这进一步得到了进一步的证实，即摄食斜纹夜蛾的粪中粪便中的无机物含量要高于那些。饲喂P. lutea。在两个物种中，死去的骨骼上的污垢生物（主要是草皮藻）的覆盖率都大大降低了（迷彩对虾为-49％，黄褐对虾为-38％）。我们的研究提供了明确的证据，即Setosum D. setosum可有效减少藻类生长并引起珊瑚的生物侵蚀，尤其是多孔性更高，密度较小的Camusus。结果与现场观察到的在H.H.W.严重破坏珊瑚的地方（以假单胞菌为主导），并表明迫切需要采取管理措施，以减少高密度石斑鱼在该地点的珊瑚生物侵蚀。

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  • 作者

    Clement P. Dumont; Dickey C.C. Lau; Juan Carlos Astudillo; Kin Fung Fong; Solomon T.C. Chak; Jian-Wen Qiu;

  • 作者单位

    The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pok Fu Lam Road, Hong Kong, China;

    Department of Biology, Hong Kong Baptist University, 224 Waterloo Road, Hong Kong, China;

    The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pok Fu Lam Road, Hong Kong, China;

    Department of Biology, Hong Kong Baptist University, 224 Waterloo Road, Hong Kong, China;

    The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pok Fu Lam Road, Hong Kong, China;

    Department of Biology, Hong Kong Baptist University, 224 Waterloo Road, Hong Kong, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    bioerosion; coral; diadema; platygyra; porites; sea urchin;

    机译：生物侵蚀;珊瑚;腹泻;鸭嘴兽;多孔体;海胆;

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