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为了解近岸河口海域蟹类资源分布及其与主要环境因子的关系,利用2010年春季(4月)和秋季(10月)椒江口海域渔业资源调查资料,分析了椒江口蟹类资源密度的分布、优势种以及水团、水深等环境因子对蟹类数量和分布的影响.结果表明:椒江口海域春季和秋季蟹类平均重量密度分别为74.57 kg km-2和62.73 kg km-2,尾数密度均值分别为3.63×103 ind.km-2和5.07×103 ind.km-2;蟹类密度平面分布特征,春季在调查海域蟹资源密度中部高于两侧,高密度区出现在椒江河口北部区域,尤其是受椒江径流影响明显的北部岛礁海域;秋季则两侧明显高于中部,尤其是大陈岛东南部受台湾暖流和浙江上升流影响的海域以及受椒江径流影响明显的西北部海域.逐步回归分析表明:椒江口温、盐度和水深与蟹类资源密度均无显著的相关关系;春季和秋季,日本蟳(Charybdis japonica)对蟹类资源密度贡献率均最大,为两季节唯一的优势种.本研究表明,椒江口蟹类资源密度分布不均匀,水团交汇处是蟹类资源密度的高值区,主要环境因子对蟹类资源分布影响不明显.
In order to understand the distribution of crab resources in the coastal estuarine waters and its relationship with the main environmental factors, the survey of fishery resources in the Jiaojiang Estuary in spring (April) and autumn (October) was conducted to analyze the crab resource density Distribution and dominant species as well as environmental factors such as water mass and water depth on the number and distribution of crabs.The results showed that the average weight density of spring and autumn crabs in the Jiaojiang River was 74.57 kg km-2 and 62.73 kg km-2, respectively, and the mantissa The mean density of crabs was 3.63 × 103 ind.km-2 and 5.07 × 103 ind.km-2, respectively. In the spring, the density of crab resources in the surveyed sea areas were higher than those on both sides, and the high density areas appeared in the northern part of Jiaojiang River Estuary Especially in the northern islands and reefs affected by the runoff from the Jiaojiang River. In autumn, the two sides are obviously higher than the middle part, especially in the southeastern part of Dachen Island, which is affected by the warm currents in Taiwan and the upwelling in Zhejiang Province and the northwestern part obviously affected by the runoff from the Jiaojiang River. The results of stepwise regression analysis showed that there was no significant correlation between temperature, salinity and water depth of the Jiaojiang River and the density of crab resources. In spring and autumn, the contribution rate of Charybdis japonica to crab resources density was the highest , As the only dominant species in two seasons. This study shows that crabs Jiaojiang port density uneven distribution of resources, water resources crabs group Interchange is the density of high value area, the main impact of environmental factors on the distribution of resources crabs obvious.