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Article

Unexpected Diversity of Feeding Modes among Chisel-Mouthed Ethiopian Labeobarbus (Cyprinidae)

1
Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Russia
2
Zoological Institute of Russian Academy of Sciences, 199034 St. Petersburg, Russia
3
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 117071 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Kay Van Damme and Alexey A. Kotov
Water 2021, 13(17), 2345; https://doi.org/10.3390/w13172345
Received: 30 June 2021 / Revised: 13 August 2021 / Accepted: 20 August 2021 / Published: 26 August 2021
(This article belongs to the Special Issue Species Richness and Diversity of Aquatic Ecosystems)
Trophic resource partitioning is one of the main drivers of adaptive radiation. The evolutionary diversification of large African barbs, the genus Labeobarbus, seems to be related to mouth polymorphism. The chisel-mouthed or scraping phenotype has repeatedly evolved within Labeobarbus. At least five ecomorphs with a scraping mouth morphology were detected in the waters of the Ethiopian Highlands and can be provisionally classified into two groups: (i) “Varicorhinus”-like, and (ii) “Smiling”-like. Previously, all Labeobarbus with a scraping-mouth morphology were considered to be periphyton feeders. Using data on morphology, diet and stable isotope ratios (C and N), we addressed the question: does a scraping-mouth morphology predict feeding on periphyton? Our study revealed that five scraper ecomorphs exhibited three main feeding modes: (i) periphyton-eating, (ii) herbivory–detritivory, and (iii) insectivory. Two cases of the parallel divergence of sympatric ecomorphs with distinct feeding modes (herbivory–detritivory vs. insectivory) were revealed in two geographically isolated basins. A significant difference in δ15N values was detected among sympatric scraper ecomorphs. A periphytonophagous scraper was rich in δ15N values that are comparable with those in sympatric piscivorous fish. This data sheds light on the possibility of the utilization of periphyton as a protein-rich food by fishes. View Full-Text
Keywords: adaptive radiation; ecological speciation; fishes; Africa; trophic resource partitioning; stable isotopes adaptive radiation; ecological speciation; fishes; Africa; trophic resource partitioning; stable isotopes
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MDPI and ACS Style

Levin, B.A.; Komarova, A.S.; Rozanova, O.L.; Golubtsov, A.S. Unexpected Diversity of Feeding Modes among Chisel-Mouthed Ethiopian Labeobarbus (Cyprinidae). Water 2021, 13, 2345. https://doi.org/10.3390/w13172345

AMA Style

Levin BA, Komarova AS, Rozanova OL, Golubtsov AS. Unexpected Diversity of Feeding Modes among Chisel-Mouthed Ethiopian Labeobarbus (Cyprinidae). Water. 2021; 13(17):2345. https://doi.org/10.3390/w13172345

Chicago/Turabian Style

Levin, Boris A., Aleksandra S. Komarova, Oksana L. Rozanova, and Alexander S. Golubtsov 2021. "Unexpected Diversity of Feeding Modes among Chisel-Mouthed Ethiopian Labeobarbus (Cyprinidae)" Water 13, no. 17: 2345. https://doi.org/10.3390/w13172345

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