论文部分内容阅读
根据南海北部湾海域鱼类物种种类组成的历史资料,系统整理了鱼类物种组成,并计算了北部湾海域鱼类的平均分类差异指数(△+)和分类差异变异指数(∧+)。结果显示,北部湾海域共记录鱼类626种,隶属2纲27目。其中软骨鱼类为7目16科27属42种;硬骨鱼类20目122科344属584种,以鲈形目种类最多、有331种,占硬骨鱼类总物种数的56.8%,其次为鲀形目、杜夫鱼目等。北部湾海域鱼类平均△+约为63.5,∧+约为110。北部湾海域鱼类△+高于东沙群岛的珊瑚礁海域,但低于北方的黄渤海海域和一些河口区域,符合纬度较低的海域其△+一般也较小这一规律;而∧+与其他海区相比则差异不大。
According to the historical data of species composition of Beibu Gulf in the South China Sea, the fish species composition was systematically analyzed. The average taxonomic difference index (△ +) and the taxonomic variation index (∧ +) of Beibu Gulf waters were calculated. The results showed that a total of 626 species of fish were recorded in Beibu Gulf waters, belonging to 2 classes and 27 orders. Among them, cartilaginous fish were 7 orders, 16 families, 42 genera and 42 species; teleost fish 20 orders, 122 families, 344 genera and 584 species, of which Perciformes had the largest species and 331 species, accounting for 56.8% of the total species of teleost fish, followed by鲀 form, Duf fish head and so on. Fish in Beibu Gulf area average △ + is about 63.5, ∧ + about 110. The fish in the Beibu Gulf area is higher than the coral reefs in the Dongsha Islands but lower than those in the Huang Bohai Sea and some estuaries in the north, which is consistent with the rule that the △ + is generally smaller in the lower latitudes; and ∧ + The sea area is not much difference.