摘要
为了解浙江南部近海鱼类群落粒径结构的时空特征、季节变动及其影响因素,基于2019年4个季节的渔业资源调查数据,利用粒径谱、多维尺度排序等方法,研究了鱼类粒径谱特征及其时空变动。结果表明,全年Sheldon鱼类粒径谱形状大体为单峰型,鱼类粒级介于-2~11,最高值出现在6~7粒级,以小型鱼类为主。四季Sheldon鱼类粒径谱基本呈单峰型,各季节峰值和最高生物量对应粒级区间、鱼种组成存在差异,其标准化鱼类粒径谱拟合曲线均呈"穹顶"型,曲率介于-0.18~-0.09,以冬季最大(-0.09),春季最小(-0.18),表明春季鱼类生物量受外界干扰程度最大,冬季相对稳定。多维尺度排序结果表明,冬、春季鱼类群落可分为4组,夏、秋季可分为3组。分组粒径谱分析结果表明,近岸鱼类群落比远岸鱼类群落受到更大的外界干扰。总体上,浙江南部近海鱼类群落处于干扰状态,这可能与环境因素、洄游性与定栖性鱼类的季节变化等有关,也存在禁渔期及人类捕捞活动的影响。
In order to improve the understanding of the spatio-temporal characteristics, seasonal variation and influencing factors of size structure of offshore fish communities in southern Zhejiang Province, we studied the characteristics of fish particle size spectrum and its spatiotemporal variation by means of particle size spectrum and multi-dimensional scale sorting based on the seasonal fishery survey data in 2019. The results show that the shape of annual Sheldon fish size spectrum was generally unimodal, and the size class ranged from-2 to 11, with the highest biomass occurring in the size classes of 6-7, mainly small fishes.The Sheldon fish size spectrum was basically unimodal in four seasons, and there were seasonal differences in the peak and maximum biomass corresponding to the size range and species composition. The fitted curves for the normalized fish size spectrum were all dome-shaped, and the curvature ranged from-0.18 to-0.09, with the maximum in winter(-0.09) and the minimum in spring(-0.18), indicating that the fish biomass was most vulnerable to external disturbance in spring but relatively stable in winter. The results of multidimensional scaling demonstrate that the fish community in this study can be classified into four subgroups in winter and spring, and three subgroups in summer and autumn. The analysis of size spectra by subgroups shows that the nearshore fish community is much affected by external disturbances than the far-shore fish community. In general, the fish community off southern Zhejiang Province is in a disturbed state, which may be related to environmental factors, seasonal migratory and sedentary fishes, as well as the closed fishing periods and fishing activities.
作者
杨柯迩
周曦杰
秦松
马金
赵静
YANG Ke'er;ZHOU Xijie;QIN Song;MA Jin;ZHAO Jing(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;College of Environment and Ecology,Xiamen University,Xiamen 361102,China;Zhejiang Mariculture Research Institute,Wenzhou 325005,China;National Engineering Research Center for Oceanic Fisheries/Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Shanghai 201306,China)
出处
《南方水产科学》
CAS
CSCD
北大核心
2022年第1期10-21,共12页
South China Fisheries Science
基金
国家自然科学基金项目(31902372,41606146)
浙江省渔业资源专项调查(158053)。
关键词
鱼类群落
粒径谱
多维尺度分析
浙江南部近海
Fish community
Size spectrum
Multidimensional scaling
Offshore waters of southern Zhejiang Province
