宽鳍(?)Zacco platypus(Temminck et Schlegel)的形态变异

采用形态度量与框架度量相结合方法测量了13个地理区域的宽鳍鳃标本,并进行了主成分分析。结果表明:宽鳍鳃的形态变异主要表现在躯体纵轴及头部特征上。头部的形态变异大于躯体的形态变异。宽鳍鳃的分布没有明显的地理位置方面的南北和东西变化特点,各地理区域的宽鳍鳃应视为一个种。

丹江口水库三种鲤科鱼类寄生木村小棘吻虫的季节动态

作者于2004年2月至2005年2月调查了丹江口水库木村小棘吻虫Micracanthornhynchina motomurai(Harada,1935)感染三种小型经济鲤科鱼类--马口鱼(Opsariichthys uncirostris)、宽鳍鱲(Zacco platypus)和油■(Hemiculter bleekeri bleekeri)的季节动态情况。在感染率和感染丰度方面,寄生于马口鱼和油■的木村小棘吻虫呈现出显著的季节变化:秋冬季节感染率和感染丰度都比较高,而春夏季节则比较低;与此不同的是,寄

Sequences of cytochrome b gene for primitive cyprinid fishes in East Asia and their phylogenetic concerning

1140 bp of cytochrome b gene were amplified and sequenced from 14 species of primitive cyprinid fishes in East Asia. Aligned with other ten cytochrome b gene sequences of cyprinid fish from Europe and North America retrieved from Gene bank, we obtained a matrix of 24 DNA sequences. A cladogram was generated by the method of Maximum likelihood for the primitive cyprinid fishes. The result indicated that subfamily Leuciscinae and Danioninae do not form a monophyletic group. In the subfamily Danioninae, Opsariichthys biden and Zacco platypus are very primitive and form a natural group and located at the root. But the genera in subfamily Danioninae are included in different groups and have not direct relationship. Among them, Aphyocypris chinensis and Yaoshanicus arcus form a monophyletic group. Tanichthys albonubes and Gobiocypris rarus have a close relation to Gobioninae. The genus Danio is far from other genera in Danioninae, In our cladogram, the genera in Leuciscinae were divided into two groups that have no direct relationship. The genera in Leuciscinae distributed in Europe, Sibera and North America, including Leuciscus, Rutilus, Phoxinus, N. crysole, Opsopoeodus emilae, form a monophyletic group. And the Leuciscinae in southern China including Ctenopharyngodon idellus, Mylopharyngodon piceus, Squalibarbus and Ochetobius elongatus have a common origination.