Experimental evidence for the biological species status in Lake Tana's Labeobarbus flock (Cyprinidae)

Abstract Lake Tana (Ethiopia) harbours the only known remaining intact species flock of large (max. 100 cm standard length, SL) cyprinid fishes (15 Labeobarbus spp.). In 'common garden' experiments progeny of the riverine spawning benthivorous L. tsanensis, and of the piscivorous L. trutti...

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Published inAnimal biology (Leiden, Netherlands) Vol. 60; no. 2; pp. 183 - 193
Main Authors de Graaf, Martin, Nagelkerke, Leo, Palstra, Arjan, Sibbing, Ferdinand
Format Journal Article
LanguageEnglish
Published The Netherlands Brill 01.01.2010
BRILL
Subjects
ADAPTATIVE RADIATION
africa
barbus-intermedius complex
cichlid fishes
Cyprinidae
EAST-AFRICA
ecological divergence
ETHIOPIA
evolution
NATURE NURTURE
origin
REPRODUCTIVE ISOLATION
reproductive segregation
salmon
SYMPATRIC SPECIATION
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Summary:Abstract Lake Tana (Ethiopia) harbours the only known remaining intact species flock of large (max. 100 cm standard length, SL) cyprinid fishes (15 Labeobarbus spp.). In 'common garden' experiments progeny of the riverine spawning benthivorous L. tsanensis, and of the piscivorous L. truttiformis and L. megastoma was raised under similar environmental conditions to test if interspecific morphological differentiation would occur. Interspecific morphological differences and divergence were clearly observed early in ontogeny (≤ 40 mm SL). This study is the first to demonstrate direct proof for the genetic basis of morphological differentiation among these labeobarbs, providing further support that Lake Tana's labeobarb species are true biological species.
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ISSN:1570-7555
1570-7563
DOI:10.1163/157075610X491725