摘要
根据1993年春季、1992年秋季和2006年春、秋季在北部湾进行的底拖网调查资料,对北部湾渔业生物的资源状况、渔获种类的组成结构、优势度及其动态变化特征进行了分析。结果表明,渔业生物资源量指数的季节差异存在明显的年际变化,但年均值变化不大。重要种类组成的年际变化比较明显,1993年春季和1992年秋季的优势种均为发光鲷(Acropoma japonicum),2006年春季为发光鲷和二长棘鲷(Parargyrops edita),秋季为发光鲷、黄斑鲾(Leiognathus bindus)和竹筴鱼(Trachurus japonicus);与1992-1993年相比,2006年主要种的种数明显减少,种类也发生变化。与1992-1993年相比,2006年春季和秋季的Shannon-Wiener多样度指数(H′)和均匀度指数(J′)均出现明显下降,而种类丰富度变化不大。重要种类呈现低质化和小型化趋势。文中讨论了北部湾渔业生物量的历史变化、种类更替特征及多样性指数变化的原因。
Based on the data of bottom trawl surveys in Beibu Gulf in autumn of 1992 and spring of 1993, as well as the data in spring and autumn of 2006, variation of fishery resources, structure and composition of catch species, dominance level and their dynamic changes were analyzed. The results show that seasonal difference of fishery resource indices varied in different years, but the annual mean value varied slightly. The important species composition also varied obviously in different years. The dominant species was Acropoma japonicum both in spring of 1993 and autumn of 1992, but there were 2 dominant species of Acropomajaponicum and Parargyrops edita in spring of 2006, and 3 species of Acropomajaponicum, Leiognathus bindus and Trichiurus haumela in autumn of 2006, respectively. The amount of main species in 2006 decreased and the species were different from 1992-1993. Compared with 1992-1993, Shannon-Wiener index H＇ and species evenness index J＇ reduced evidently in 2006, but species richness index D changed slightly. The important species were characterized lowquality and miniaturization. The historical changes of fishery resources, characteristics of species subrogation and changes of diversity indices in Beibu Gulf were also discussed.
出处
《中国水产科学》
CAS
CSCD
北大核心
2008年第5期816-821,共6页
Journal of Fishery Sciences of China
基金
农业部近海渔业资源调查项目(070404)
中央级公益性科研院所基本科研业务费专项资金项目(2007YD02)
上海水产大学研究生基金项目(科07-271-81).
关键词
北部湾
渔业生物
群落结构
多样性
Beibu Gulf
fishery species
community structure
diversity
