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本文根据2009年5月、9月和12月海州湾水域生物资源的调查资料,分析了海州湾水域蟹类资源密度的分布,多样性及蟹类优势种对蟹类数量分布的影响。结果表明,5月、9月和12月蟹类质量密度分别为36.15、53.85和44.91kg/km2,尾数密度为6.33×103、3.13×103和35.88×103ind./km2。5月、9月和12月蟹类以质量计算的物种多样性分别是0.95、0.64和0.65,以尾数计算的物种多样性分别是0.96、1.01和0.61。海州湾水域以广温广盐性蟹类为主,5月、9月和12月的最重要的优势种分别为双斑蟳(Charybdis bimaculata)、日本蟳(Charybdis japonica)和豆形短眼蟹(Xenophthalmus pin-notheroides)。春季蟹类的密度分布规律不明显;秋季蟹类的密度分布除湾外个别站位很高之外,其余站位分布均匀;冬季蟹类的密度分布沿岸稍高于湾外。季节变化很大程度上影响了优势种的改变。不同季节,蟹类优势种类的绝对优势,使得蟹类多样性平面分布与蟹类密度分布存在差异。
Based on the survey data of biological resources in the waters of Haizhou Bay in May, September and December 2009, this paper analyzed the distribution and diversity of crab resource density and the influence of the dominant species of crab on the distribution of the number of crabs in Haizhou Bay waters. The results showed that the crab mass densities in May, September and December were 36.15, 53.85 and 44.91 kg / km2 respectively, and the mantissa densities were 6.33 × 103,3.13 × 103 and 35.88 × 103 ind. / Km2. May, September and September The species diversity of crabs in December was 0.95, 0.64 and 0.65, respectively. The species diversity calculated by mantissa was 0.96, 1.01 and 0.61, respectively. The most dominant dominant species in May, September and December in Haizhou Bay waters were broad-temperature broad-salt crabs, Charybdis bimaculata, Charybdis japonica, Crab (Xenophthalmus pin-notheroides). In spring, the density distribution of crabs was not obvious. In autumn, the density distribution of crabs was uniform except for the individual stations outside the bay. The density distribution of crabs in winter was slightly higher than that outside the bay. Seasonal changes have largely affected the change of dominant species. In different seasons, the absolute superiority of the predominant species of crabs makes the distribution of crab diversity and the density distribution of crabs different.