The influence of contrasting lentic and lotic hydrological environments on the morphology of members of the Galaxias vulgaris species complex was examined. Morphological variation between habitat types was investigated by comparison of populations of Galaxias brevipinnis (inferred ancestor), Galaxias gollumoides (roundhead morphotype) and Galaxias vulgaris (flathead morphotype). Interspecific convergence and intraspecific divergence of morphological characters were demonstrated, representing general shifts in morphology towards a common functional form in particular hydrological environments. In all species, more lentic Galaxias had longer bodies; shorter, more stout caudal peduncles; longer, narrower pectoral fins; and longer, wider heads with larger mouths. In comparison, lotic Galaxias had relatively shorter bodies; more slender caudal peduncles; broader pectoral fins; and shorter flatter heads, with smaller mouths. This study suggests that the hydrological environment of a habitat is an important factor moulding and maintaining an individual fish’s morphology to a particular habitat type, most likely representing a phenotypic plastic response.

中文翻译：

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扁豆生境和豪华生境中星河鱼类的形态学趋同和发散

对成员的形态对比静水和流水的水文环境的影响Galaxias 寻常种复杂的检查。通过比较短生的Galaxias brevipinnis（推断祖先），Galaxias gollumoides（圆头形态）和Galaxias vulgaris（扁平头形态）的种群，研究了栖息地类型之间的形态变异。证明了形态特征的种间趋同和种内趋异，代表了在特定的水文环境中形态向一般功能形式的一般转变。在所有物种中，更多的透镜状星系身体更长；短而粗壮的尾柄；更长，更窄的胸鳍；头更长，更宽，嘴更大。相比之下，抽水星河的身体相对较短。尾柄更纤细；较宽的胸鳍；和较短的扁平头，嘴更小。这项研究表明，栖息地的水文环境是塑造和维持单个鱼类的形态至特定栖息地类型的重要因素，很可能代表了表型可塑性反应。