Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

OAI: https://revistas.ucr.ac.cr/index.php/rbt/oai
Phenotypic variation of the fishes Curimata mivartii (Characiformes: Curimatidae) and Pimelodus grosskopfii (Siluriformes: Pimelodidae) in lotic and lentic habitats
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Keywords

geometric morphometric
phenotypic variation
phenotypic plasticity
flow regimes
morfometría geométrica
variación fenotípica
plasticidad fenotípica
regímenes de flujo

How to Cite

Hincapié-Cruz, J. P., & Márquez, E. J. (2021). Phenotypic variation of the fishes Curimata mivartii (Characiformes: Curimatidae) and Pimelodus grosskopfii (Siluriformes: Pimelodidae) in lotic and lentic habitats. Revista De Biología Tropical, 69(2), 434–444. https://doi.org/10.15517/rbt.v69i2.41708

Abstract

Introduction: Despite their importance in swimming performance and individual fitness, body shape and size variations in response to water flow velocity remain unknown for most migratory freshwater fishes in the Neotropics. Objective: Test the hypothesis of phenotypic variation in the size and body shape of two species of freshwater fishes that encounter changes in water velocity across their migrations in two rivers that belong to a single Neotropical basin. Methods: Landmark-based geometric morphometrics was used to study variations in body size and shape for the fish species Curimata mivartii and Pimelodus grosskopfii in lotic and lentic habitats of the Colombian Magdalena-Cauca Basin. Results: Individuals of C. mivartii from two lotic habitats were similar in size and both were significantly bigger than those from lentic habitats, whereas individuals of P. grosskopfii were similar in size in both habitats. Both species showed more streamlined bodies in lotic habitats and deeper body shapes in lentic habitats. Conclusions: Both species exhibit phenotypic changes in body shape concordant with previous predictions on morphological variations of fishes. This information is relevant to predict changes in response to environmental heterogeneity, especially those induced by anthropogenic activities that change the water velocity in the river.

https://doi.org/10.15517/rbt.v69i2.41708
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Copyright (c) 2021 Juan P. Hincapié-Cruz, Edna J. Márquez

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