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II ‐ Morphological diversity of “large barbs”; from Lake Tana and neighbouring areas: Homoplasies or synapomorphies?

 

作者: MikhailV. Mina,   AlexanderN. Mironovsky,   AlexanderS. Golubtsov,   YuriyYu. Dgebuadze,  

 

期刊: Italian Journal of Zoology  (Taylor Available online 1998)
卷期: Volume 65, issue sup1  

页码: 9-14

 

ISSN:1125-0003

 

年代: 1998

 

DOI:10.1080/11250009809386789

 

出版商: Taylor & Francis Group

 

关键词: Africa;Barbus;Morphological diversity;Speci‐ation

 

数据来源: Taylor

 

摘要:

In the Lake Tana barbs the PCA of skull measurements reveals “ontogenetic channels”; within which individual ontogenetic trajectories are located. Some individuals seem to acquire states of characters specific for a certain morphotype quite late when they are 20–25 cm SL and 3–5 years old. Morphologically different sympatric forms of large barbs are also found in the Didessa (Blue Nile basin), Genale (Wabi Shebeli basin), and Gibe (Omo basin) rivers. In all the three rivers barbs resembling certain morpho‐types of the Lake Tana barbs occur. Most probably, allopatric big‐mouthed forms originated independently from sympatric forms which have no conspicuous specific traits and that their similarity results from homoplasies.

 

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