团头鲂3个地理种群杂交效果的配合力和微卫星标记预测

根据南沙群岛西南部陆架海域鱼类调查研究的历史资料, 采用Nelson分类系统对鱼类物种组成进行了系统整理, 并从不同的分类阶元上分析了南沙群岛西南部陆架海域鱼类的多样性。分类阶元包含指数(TINCLi), 分类多样性指数(△+和∧+), 目级和科级水平丰富度(Rr)以及目级和科级水平相似性系数(C)为本研究的主要研究指数。结果显示, 南沙群岛西南部陆架海域共记录鱼类20目110科206属, 以鲈形目(Perciformes)种类居绝对优势。采用分类阶元包含指数分析, 南沙群岛西南部陆架海域鱼类组成目、科、属所分别拥有的(科、属、种), (属、种)和(种)的平均数目分别为(5.5、10.30、14.85), (1.87、2.70)和(1.44); 在目级水平上, 比高纬度的东海陆架、大亚湾和东沙群岛海域高, 并且与纬度梯度成反比, 证明低纬度海域的鱼类分类多样性低, 种类组成主要集中分布于较少数的分类类群。使用PRIMER5.2软件计算了平均分类差异指数△+和分类差异变异指数∧+, 数值分别为65.8和110.0, 其中△+接近于东海陆架(65.7), 高于东沙群岛(55.2)和大亚湾海域(62.2), 说明南沙群岛西南部陆架海域鱼类的亲缘关系接近于东海陆架海域鱼类, 比东沙群岛和大亚湾海域鱼类的远。与三个海区的相似性系数比较结果显示, 在目级和科级水平上, 南沙群岛西南部陆架海域鱼类组成同大亚湾海域更为接近。

Prediction of hybrid vigor among three geographical populations of Megalobrama amblycephala by combination ability and SSR markers

We documented the data of fish species systematically collected in southwestern continental Shelf of Nansha Islands according to Nelson’s classification system and analyzed the diversity at different taxonomic levels using inclusion index at taxonomic level(TINCLi),taxonomic diversity(△+ and ∧+),relative abundances(Rr) and the similarity index(C) at order and family levels.The results indicated that the fish species in the southwestern continental shelf of Nansha Islands belonged to 20 orders,110 families and 206 genera,and Perciformes is the major order.Analyzed by the inclusion index at taxonomic level,the average number of(families,genera,species),(genera,species) and(species) in per order,family and genus are(5.5,10.30,14.85),(1.87,2.70) and(1.44),respectirvel,higher than the case of East China Sea continent shelf,Daya Bay and Dongsha Islands at order level.The values assumed the inverse proportion with the variation of latitude which demonstrated that the taxonomic diversity of fishes at lower-latitude was lower than that at the higher-latitude.The average taxonomic distinctness △+and the variation in taxo-nomic distinctness ∧+ of the Daya Bay were tested in this paper by the PRIMER5.2.The average taxonomic distinctness △+ was 65.8,and the variation in taxonomic distinctness ∧+was 110.0.Compared the △+ with those of East China Sea continent shelf,Daya Bay and Dongsha Island,the genetic relationship of the composition of fish species in southwestern continental shelf of Nansha Islands was closer to East China Sea continent shelf(65.7) and farther from Dongsha Island(55.2) and Daya Bay(62.2).Based on the similarity index,at the order and family levels,the composition of fish species in southwestern continental shelf of Nansha Islands is similar to the Daya Bay.