摘要
根据1985年和2000年秋季渔业生物资源底拖网调查资料,分析了黄海底层鱼类群落结构的时空变化。结果表明,渔业资源优势种的组成随区域和时间不同有着较大的差异。黄海北部和中部渔获种类组成相似性较高,北部与南部、中部与南部的相似性较低;黄海渔获生物种类组成年间相似性较高,为65。进一步的单因子ANOSIM分析表明黄海底层鱼类群落不同区域和年间种类组成没有显著性差异。黄海渔业生物多样性由北向南递减。与1985年相比,2000年鱼类群落长度谱表现出小型种类和小个体增多,大个体减少,且长度范围变小;主要优势种的长度组成也呈现小型化趋势。长度谱区域变化则是从北部向南部小个体数量增多,大个体数量减少。
Based on the data collected from bottom trawl surveys conducted in the autumns of 1985 and 2000, the temporal and spatial changes in structure of demersal fish assemblage in the Yellow Sea were analyzed. The temporal and spatial variations in the composition of dominant species were examined. The similarity indices of species composition between northern and central areas of the Yellow Sea was relatively high, while the indices among southern, northern and central parts of the Yellow Sea were relatively low. The similarity between 1985 and 2000 was relatively high, which was 65. Further ANOSIM test indicated no significant interyear changes and interarea differences in the species composition of the fish assemblages in the Yellow Sea. There was a decreasing tendency in species diversity from the northern to the southern areas. Changes in the integrated community size spectra in the Yellow Sea indicated an increase in number of smallsized species or small size individuals and a declining tendency in number of large size individuals as well as a diminishing length range. The analysis on length distribution of some commercially important species, such as Engraulis japonicus, Scomber japonicus, Cleisthenes herzensteini, Trichiurus haumela, Pseudosciaena polyactis and so on, showed that there was a declining tendency in the dominant length class, as reflected in the increase of small individuals in number. The smallsized individuals increased and large ones decreased in mumber from the north to the south concerning the areas.
出处
《中国水产科学》
CAS
CSCD
北大核心
2003年第2期148-154,共7页
Journal of Fishery Sciences of China
基金
国家重点基础研究发展规划项目资助(G19990437)
国家自然科学基金国际合作项目资助(IIASA)
关键词
秋季
黄海
底层鱼类
群落结构
时空变化
种类多样性
Yellow Sea
demersal fish
community structure
species diversity
size spectra of the integrated community
