| 浙江三门湾冬夏季蟹类数量分布和优势种的变化 |
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| 引用本文： | 蔡萌,徐兆礼,何新春.浙江三门湾冬夏季蟹类数量分布和优势种的变化[J].海洋渔业,2009,31(1). |
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| 作者姓名： | 蔡萌 徐兆礼 何新春 |
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| 作者单位： | 1. 中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室,上海,200090
2. 中海石油环保服务有限公司,北京,100107 |
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| 摘 要： | 利用2007年12月和2008年6月三门湾海域渔业资源调查资料,研究三门湾蟹类密度的时空分布,分析优势种、地形地貌和水文等因素对蟹类分布的影响。结果表明,12月和6月蟹类重量密度分别为38.44 kg/km2和75.20 kg/km2,尾数密度为1.99×103ind/km2和3.66×103ind/km2。蟹类重量密度分布呈三门湾西北部水域高于东南部水域趋势,尾数密度分布则呈三门湾西北部水域低于东南部水域趋势。依据相对重要性指数分析的结果,日本蟳是本海域蟹类第一优势种,其次为经济品种三疣梭子蟹。两季蟹类大部分为幼体,夏季比冬季种类数有增加。上述优势种对三门湾蟹类数量的变化有较明显的回归贡献。
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| 关 键 词： | 三门湾 蟹类 优势种 密度 |
Quantitative distribution and dominant species variation of crab in the winter and summer of Sanmen Bay, Zhejiang Province |
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| CAI Meng,XU Zhao-li,HE Xin-chun.Quantitative distribution and dominant species variation of crab in the winter and summer of Sanmen Bay, Zhejiang Province[J].Marine Fisheries,2009,31(1). |
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| Authors: | CAI Meng XU Zhao-li HE Xin-chun |
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| Abstract: | Based on the data from two oceanographic censuses in the Sanmen Bay during December 2007 and June 2008,this paper described the spatial-temporal distribution of crab density involved in some impact factors such as dominant species,background of topography and geomorphy,as well as hydrological features.The results showed that the weight density in December 2007 and June 2008 were 38.44 kg/km2 and 75.20 kg/km2 respectively,the individual densities were 1.99×103 ind/ km2 and 3.66×103 ind/ km2.The weight densities tended to higher in the northwest area than those in the southeast area,and individual densities tended to higher in the southeast area than those in the northwest area of the Sanmen Bay.Charybdis japonica was the most important crab species in December 2007 and June 2008,but Portunus trituberculatus was a critical economical species.In addition,most of the crabs were juvenile,and species number in June was higher than in December.In short,the abundance variation of dominant species and its contribution to crab density were important. |
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| Keywords: | Sanmen Bay crab dominant species density |
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