椒江口海域春秋季蟹类资源分布与环境的关系

发布时间：2018-08-27 20:03

【摘要】：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,日本圀(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.
[Abstract]:In order to understand the distribution of crab resources and their relationship with main environmental factors in coastal estuary, the distribution of crab resource density in Jiaojiang estuary was analyzed by using the survey data of fishery resources in spring (April) and autumn (October) of 2010. The effects of dominant species, water mass and water depth on the quantity and distribution of crabs. The results showed that the mean weight density of crabs in spring and autumn were 74.57 kg km-2 and 62.73 kg km-2, respectively, and the mean values were 3.63 脳 10 ~ 3 ind.km-2 and 5.07 脳 10 ~ 3 ind.km-2;, respectively. The density of crab resources in the middle of spring was higher than that on both sides. The high density area appeared in the northern area of Jiaojiang River estuary, especially in the northern island and reef area, which was obviously affected by the runoff of Jiaojiang River, and was obviously higher on both sides in autumn than in the middle part. Especially, the southeast of Dachen Island is affected by Taiwan warm current and Zhejiang upwelling, and the northwestern sea area is obviously affected by Jiaojiang River runoff. Stepwise regression analysis showed that there was no significant correlation between the temperature, salinity and water depth of Jiaojiang Estuary and the resource density of crabs, and that (Charybdis japonica) from Japan contributed the most to the density of crab resources in spring and autumn, and was the only dominant species in both seasons. The results showed that the density distribution of crab resources in Jiaojiang Estuary was not uniform, and the water mass intersection was the high value area of crab resource density, and the main environmental factors had no obvious influence on the distribution of crab resources.
【作者单位】：中国水产科学研究院东海水产研究所;国家海洋局海洋咨询中心;
【基金】：国家重点基础研究发展计划项目(2010CB428705) 国家自然科学基金项目(41176131)资助~~
【分类号】：S932.52

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