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Functional morphology of the tetra fish Astyanax lacustris differs between divergent habitats in the Pantanal wetlands
Author(s) -
CostaPereira R.,
Araújo M. S.,
Paiva F.,
Tavares L. E. R.
Publication year - 2016
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13026
Subject(s) - biology , macrophyte , habitat , ecology , lake ecosystem , wetland , predation , river ecosystem , phenotypic plasticity , population , demography , sociology
This study investigated whether the body morphology of the tetra fish Astyanax lacustris (previously Astyanax asuncionensis ) varied between populations inhabiting one lagoon (a lentic, shallow environment, with great habitat complexity created by aquatic macrophytes) and an adjacent river (a deeper, lotic environment where aquatic macrophytes are scarce) in a seasonally flooded wetland, despite population mixing during the wet season. Morphological differences matched a priori predictions of the theory relating functional body morphology and swimming performance in fishes between lagoon and river habitats. Observed morphological variation could have resulted from adaptive habitat choice by tetras, predation by piscivores and adaptive phenotypic plasticity during development.