Lake Tana large barbs: phenetics, growth and diversification

Мина, М. В.

doi:10.1006/jfbi.1996.0040

Cited by 16 publications

(20 citation statements)

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“…Morphologically intermediate or unclassifiable individuals are rare (Nagelkerke et al, 1994(Nagelkerke et al, , 1995bMina et al, 1996a). Moreover, observations of diet divergence among the morphotypes of Lake Tana, bathymetric divergence (Nagelkerke et al, 1994), spatially and/or temporal segregation during spawning (Nagelkerke & Sibbing, 1996) and the clear morphological differences which allow an easy recognition of most of the morphotypes (Nagelkerke et al, 1994(Nagelkerke et al, , 1995bMina et al, 1996a) corroborate the inferences from the allozymic and MHC data. The Lake Tana morphotypes probably constitute an endemic monophyletic group of taxa.…”

Section: Sympatric Speciation?mentioning

confidence: 77%

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Genetic divergence among morphotypes of Lake Tana (Ethiopia) barbs

Berrebi¹

1998

Biological Journal of the Linnean Society

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The genus Barbus is a paraphyletic assemblage that includes three different ploidy levels: diploid, tetraploid and hexaploid. 'B.' inhmdius, which inhabits Lake Tana (Ethiopia), is a hexaploid taxon that forms a 'species flock' consisting of at least 14 morphotypes. Thirtyone presumptive allozymic loci were analysed in a large sample of 'B.' intermedius. No diagnostic loci were observed between the morphotypes, but substantial differences in allele frequencies were found. One morphotype, Acute, differs significantly from the others. The presence of this genetic differentiation within the lake strongly suggests that the morphotypes are diverging lineages. Because of some parallel characteristics with cichlid species flocks, we put forward the hypothesis that the morphotypes of barbs in Lake Tana represent a species flock that originated via sympatric speciation with more rapid morphological than molecular differentiation. If the differentiation and the reproductive isolation are real, it is probable that the morphotypes already are or will soon reach the status of species. 0 1998 The Linnean Society of London ADDITIONAL KEY W0RDS:species flocksympatric speciationallozymes -Barbus.

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Section: Sympatric Speciation?mentioning

confidence: 77%

“…The morphotypes Intermedius, Zurki, Acute, Troutlike, Barbel, White hunch, Dark, Bighead, Bigmouth small-eye, Bigmouth big-eye and Carplike have been defined by Nagelkerke et al (1994). Acute hunch is designated according to Mina et al (1996a). The description of the morphotype Green intermedius is not yet published (M. Mina, pers.…”

Section: Samplirgmentioning

confidence: 99%

Genetic divergence among morphotypes of Lake Tana (Ethiopia) barbs

Berrebi¹

1998

Biological Journal of the Linnean Society

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“…Th is implies that the statement of Mina et al ( 1996aMina et al ( b, 2001) that the diff erent Labeobarbus 'morphs' are best described as ' L. intermedius ' undergoing environmentally induced morphological divergence late (> 20 cm SL, age 4-5 years) in ontogeny appears to be incorrect. Th is was already indicated by Nagelkerke et al ( 1995 ), who showed that several of the 15 Labeobarbus species could already be morphologically distinguished at 10-15 cm SL.…”

Section: Morphological Divergencementioning

confidence: 86%

“…Th e latest revision of Lake Tana's Labeobarbus (Nagelkerke and Sibbing, 2000 ) resulted in the rehabilitation of six distinct species lumped by Banister as L. intermedius intermedius and nine new species. However, Mina et al ( 1996aMina et al ( ,b, 2001 stated that based on ontogenetic changes in skull characters, the diff erent 'morphs' are best described as ' intermedius ' undergoing morphological divergence late in ontogeny (>20 cm SL, age 4-5 years). According to the same authors morphological transformation is triggered by the habitat in which a juvenile labeobarb arrives (nurture), and is not genetically determined (nature).…”

Section: Introductionmentioning

confidence: 97%

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

et al. 2010

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Lake Tana (Ethiopia) harbours the only known remaining intact species fl ock of large (max. 100 cm standard length, SL) cyprinid fi shes (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 interspecifi c morphological diff erentiation would occur. Interspecifi c morphological diff erences and divergence were clearly observed early in ontogeny (≤ 40 mm SL). Th is study is the fi rst to demonstrate direct proof for the genetic basis of morphological diff erentiation among these labeobarbs, providing further support that Lake Tana's labeobarb species are true biological species.

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“…These mechanisms provide the poten tial for intraspecific trophic differentiation decreasing the competition between the specimens by use of alternative resources (Savvaitova, 1989;Mina et al, 1996;Swanson et al, 2003;Amundsen et al, 2004;Denoel et al, 2004;Gerasimov, 2007;Bolnick and Lau, 2008). Intensive intraspecific competition leads to the widening of the population trophic niche (Pers son, 1983;Jonsson and Jonsson, 2001;Bergstrom, 2007).…”

Section: Biotopic Segregation and Trophic Polymorphism In The Populatmentioning

confidence: 95%

Behavioral mechanisms of trophic differentiation in benthivorous fish

Gerasimov

2012

J. Ichthyol.

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The base of the behavioral mechanism responsible for trophic differentiation in fish is determined: during feeding, specialized benthivores use space more selectively, while in nonspecialized fish, accidental components play an important role in the foraging behavior that determines the difference in its efficiency in the compared groups of fish species. Consequently, the specialized fish are able to optimize their behavior at a lower stability of the food distribution. The mechanism of density regulation based upon the polymorphism of social behavior serves as the base for the intraspecific trophic differentiation in fish. We show that species specific and intraspecific differences in the ability to risk build the base of trophic differentiation under pres sure of a predator.

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Lake Tana large barbs: phenetics, growth and diversification

Cited by 16 publications

References 0 publications

Genetic divergence among morphotypes of Lake Tana (Ethiopia) barbs

Genetic divergence among morphotypes of Lake Tana (Ethiopia) barbs

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

Behavioral mechanisms of trophic differentiation in benthivorous fish

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