2017
DOI: 10.1590/1982-0224-20160152
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Abstract: We explored patterns of phenotypic variation in Hemigrammus coeruleus from the Unini River basin, a blackwater river in the Brazilian Amazon. Geometric morphometrics was used to evaluate variation in body shape among populations from four tributaries (UN2-UN5). We found no evidence for sexual dimorphism in body size and shape. However, morphological differences among populations were detected as the analyses recovered significant groups corresponding to each sub-basin, with some overlap among them. The populat… Show more

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Cited by 10 publications
(7 citation statements)
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“…Thus, these species must efficiently perform both long-distance steady swimming and local unsteady swimming. Diet composition and habitat structural complexity are principal factors shaping fish morphology (most recently Foster et al, 2015;Prado et al, 2016;Restrepo-Escobar et al, 2016;Lazzarotto et al, 2017;Siqueira-Souza et al, 2017). Anatomically, relative trunk and tail lengths are related to the absolute number, size and relative distribution of vertebrae.…”
Section: Head Lengthmentioning
confidence: 99%
“…Thus, these species must efficiently perform both long-distance steady swimming and local unsteady swimming. Diet composition and habitat structural complexity are principal factors shaping fish morphology (most recently Foster et al, 2015;Prado et al, 2016;Restrepo-Escobar et al, 2016;Lazzarotto et al, 2017;Siqueira-Souza et al, 2017). Anatomically, relative trunk and tail lengths are related to the absolute number, size and relative distribution of vertebrae.…”
Section: Head Lengthmentioning
confidence: 99%
“…Thus, its study helps to understand the diversity of life and to appraise whether morphological variability results from selection by ecological and environmental factors or biogeographic history (e.g. vicariance, dispersal or genealogical history) (Norris, Douglas, 1992;Adams et al, 2004;D'Anatro, Loureiro, 2005;Lazzarotto et al, 2017). Comparisons carried out herein revealed subtle morphological differences among the studied groups in morphometric and meristic data but not in coloration patterns (Fig.…”
Section: Discussionmentioning
confidence: 76%
“…Such variation in body and head shapes of fish populations may be influenced by differences in predation (Burns et al, 2009;Araújo et al, 2014), diet (Hegrenes, 2001), local habit (Langerhans et al, 2003;Sidlauskas et al, 2006;Webster et al, 2011), geomorphology (physical and/or chemical features) or sub-basins (Lowe-McConnell, 1999), and genetic divergence or phenotypic plasticity or a combination of those factors (Svanbäck, Eklöv, 2006;Elmer et al, 2010;Zamudio et al, 2016). Some intraspecific studies on characid species have pointed out that morphological differentiation among populations or groups can be related to environmental, heterochronic, or geographic factors (Román-Valencia et al, 2009;Ornelas-García et al, 2014;Aguirre et al, 2016;Marinho, Langeani, 2016;Vanegas-Ríos, 2016;Lazzarotto et al, 2017).…”
Section: Discussionmentioning
confidence: 99%
“…Natural body shape and size variations have been found among H. coeruleus populations living in the Unini River basin (Lazzarotto, Barros, Louvise, & Caramaschi, ), being suggested that other fish species can present similar pattern. This variation in H. coeruleus was observed in a much smaller geographical scale than the one used in these research comparisons.…”
Section: Discussionmentioning
confidence: 97%