Ecomorphology of Astyanax species in streams with different substrates

Souza, Marcelo Alves de; Fagundes, Daniela Cristina; Leal, Cecília Gontijo

doi:10.1590/s1984-46702014000100006

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…Our results suggest that other species of Characiformes may be dominant in impacted streams. In fact, many species (particulary Characidae) of this order are active water column swimmers (Souza et al 2014). Their ability to exploit the entire water column makes them greatly flexible regarding feeding items (Moraes et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Metrics derived from fish assemblages as indicators of environmental degradation in Cerrado streams

Ávila¹,

Carvalho²,

Casatti³

et al. 2018

Zoologia

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ABSTRACT. The development of effective monitoring tools depends on finding sensitive metrics that are capable of detecting the most important environmental impacts at a given region. We assessed if metrics derived from stream fish assemblages reflect physical habitat degradation and changes in land cover. We sampled the ichthyofauna and environmental character- Some commonly used metrics did not reflect the disturbances and many others were redundant with those that did. These results indicate that the metrics derived from fish assemblages may be informative for identifying the conservation status of streams, with the potential to be used in biomonitoring.

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Section: Discussionmentioning

confidence: 99%

Metrics derived from fish assemblages as indicators of environmental degradation in Cerrado streams

Ávila¹,

Carvalho²,

Casatti³

et al. 2018

Zoologia

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“…As a behavioural characteristic, animals of this genus present difficulty to pass through geographical barriers and tend to isolate themselves in different populations (Shibatta et al, 2002). This characteristic results in decreasing genetic variability between populations, which directly reflects the observed ecomorphological differences (Souza et al, 2014).…”

Section: Species Of the Genusmentioning

confidence: 88%

“…Among the species of this genus, Astyanax rivularis is an endemic species of the São Francisco River basin (Fricke et al, 2019). This basin crosses the Serra da Canastra, a mountain range considered a biodiversity hotspot and located in the southern centre of the state of Minas Gerais, Brazil (Pasa et al, 2019;Souza et al, 2014). A. rivularis specimens are small, omnivorous and diurnal animals that actively swim in the water column (Casatti & Castro, 1998;Casatti & Castro, 2006).…”

mentioning

confidence: 99%

Gonadal morphology and difference in reproductive development of two isolated populations of Astyanax rivularis (Teleostei, Characidae)

Quirino

Siqueira‐Silva

Rodrigues

et al. 2021

Journal of Fish Biology

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Individuals of the same species may present different reproductive tactics depending on the environment in which they develop and mature. The present study aimed to define the gonadal development phases of males and females of Astyanax rivularis and to carry out a comparative analysis of the reproductive development of specimens captured in two isolated environments of the São Francisco River basin in Serra da Canastra, Brazil (Point 1: low vegetation and river showing calm and crystalline waters with small well formations; Point 2: current waters, and well-established areas of arboreal vegetation). Thus, the gonads of A. rivularis specimens were collected, fixed and processed with techniques for light microscopy. Five maturation phases of the females' reproductive cycle were established: immature, developing, spawning capable, regressing and regenerating. Three maturation phases of the males' reproductive cycle were observed: spawning capable, regressing, and regenerating. There are differences in the phases of gonadal development of A. rivularis between the two sampling points so that, possibly, animals upstream of the waterfall demonstrate a delay in the reproductive cycle in relation to animals downstream.

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“…These data expand that one by Moreira-Filho and Bertollo [2], who proposed that species of A. scabripinnis complex would be morphologically adapted into a wide range of environments. Recent studies reinforce the great morphological plasticity of the genus and demonstrate that different species in the same environment could present distinct phenotypic adaptations [28, 29]. Thus, divergent evolutionary mechanisms at each basin could change the adaptive response, since environmental exploration and interaction with other species affect character selection, habitat colonization, and, hence, genes [30].…”

Section: Discussionmentioning

confidence: 99%

Morphological and Genetic Structure of Two Equivalent Astyanax Species (Characiformes: Characidae) in the Region of Paranaíba Arc

Rocha

Alves

Pasa

et al. 2019

The Scientific World Journal

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The Astyanax scabripinnis complex is composed of a large number of almost morphological indistinguishable species, including Astyanax paranae and Astyanax rivularis, which exist in the Paraná and São Francisco Basins, respectively, and sometimes are considered subspecies of the A. scabripinnis group or even are cited just as A. scabripinnis. The two river basins are separated by the Upper Paranaíba Arc, likely the main cause of the isolation of these species. We used geometric morphometric tools and DNA analyses of populations of both species to identify the differences between them. Geometric morphometrics separated the two species into distinct groups, whose main difference was the body depth. This is generally related to the speed of the water flow in the river basins. The maximum likelihood phylogram based on mitochondrial DNA sequences formed two main clades: one composed of the population of A. rivularis and the other, of A. paranae. In the haplotype network, the species were similarly separated into two groups from the same ancestral haplotype, with A. rivularis dispersing into two lineages in the São Francisco River Basin. The distribution of A. paranae is a consequence of a secondary dispersion event in the Paraná River Basin. It forms two lineages from a haplotype derived from the ancestor. The vicariant effect of separate basins, through the elevation of the Upper Paranaíba Arc, led to the allopatric speciation of the populations originating the present species. The results of geometric morphometrics and molecular data of the fish show the importance of this geological event in the biogeography and evolutionary history of the ichthyofauna of the region and indicate that the isolation of these species seems to be effective.

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Ecomorphology of Astyanax species in streams with different substrates

Cited by 9 publications

References 27 publications

Metrics derived from fish assemblages as indicators of environmental degradation in Cerrado streams

Metrics derived from fish assemblages as indicators of environmental degradation in Cerrado streams

Gonadal morphology and difference in reproductive development of two isolated populations of Astyanax rivularis (Teleostei, Characidae)

Morphological and Genetic Structure of Two Equivalent Astyanax Species (Characiformes: Characidae) in the Region of Paranaíba Arc

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