Lake Tana large barbs: Phenetics, growth and diversification

被引:47
作者
Mina, MV [1 ]
Mironovsky, AN [1 ]
Dgebuadze, YY [1 ]
机构
[1] RUSSIAN ACAD SCI,SEVERTZOV INST EVOLUTIONARY ANIM MORPHOL & ECOL,MOSCOW 117071,RUSSIA
关键词
Africa; Barbus; species flock; sympatric speciation;
D O I
10.1006/jfbi.1996.0040
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Among the Lake Tana large barbs of about 10 cm SL only representatives of the 'acute' morphotype can be distinguished, in the size range 10-20 cm SL 'bigmouth big eye' can be identified also. As for the rest, very few individuals can be confidently affiliated with a particular morphotype most of them looking like 'intermedius'. Even within the range of 20-30 cm SL some individuals are still difficult to identify. Principal component analysis of cranial characters revealed discrete groups of morphotypes. Differences in both external and cranial characters of the morphotypes result from divergence which is most pronounced when fish are 4-5 years old and 20-25 cm SL. This divergence cannot be related exclusively with differences in the growth rates of individuals representing different morphotypes. Differences in food composition between the morphotypes probably increase in parallel with their morphological divergence. Differences between the morphotypes in the lateral line (11) and the gill rakers (Sb) counts were revealed using ANOVA. Comparison of the Lake Tana Ba,bus complex of forms with that previously known from Lake Lanao (Philippines) suggests that in both lakes the different forms arose sympatrically but that sympatric speciation in Lake Lanao has advanced further than in Lake Tana. (C) 1996 The Fisheries Society of the British Isles
引用
收藏
页码:383 / 404
页数:22
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