2009
DOI: 10.1590/s1679-62252009000400010
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Abstract: The genetic variability of three Gymnotus species from the Caracu stream, a small tributary of the left margin of Paraná River (Brazilian upper Paraná River floodplain), was estimated with data of 17 putative allozyme loci, which were obtained by using corn starch gel electrophoresis of 10 enzymatic systems: Aspartate aminotransferase (E. C. 2.6.1.1), Alcohol dehydrogenase (E. C. 1.1.1.1), Esterase (E. C. 3.1.1.1), Glucose dehydrogenase (E. C. 1.1.1.118), Glycerol-3-phosphate dehydrogenase (E. C. 1.1.1.8), Iso… Show more

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Cited by 5 publications
(3 citation statements)
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References 34 publications
(32 reference statements)
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“…The representatives of the Gymnotiformes order have specific characteristics, such as the capacity to emit electrical pulses used in communication, foraging, navigation and orientation in relation to the substrate (CRAMPTON and ALBERT, 2006). These characteristics facilitate the establishment of the species in environments with high turbidity and the presence of aquatic vegetation (REZENDE et al, 2009), as observed at the sites sampled in this study. The Azul River microbasin, which is widely exploited by agriculture and livestock activities, is characterized by a reduced area of riparian vegetation, causing high turbidity of the water and the development of dense marginal aquatic vegetation, which enables the successful colonization by the representatives of the Gymnotiformes order.…”
Section: Discussionsupporting
confidence: 53%
“…The representatives of the Gymnotiformes order have specific characteristics, such as the capacity to emit electrical pulses used in communication, foraging, navigation and orientation in relation to the substrate (CRAMPTON and ALBERT, 2006). These characteristics facilitate the establishment of the species in environments with high turbidity and the presence of aquatic vegetation (REZENDE et al, 2009), as observed at the sites sampled in this study. The Azul River microbasin, which is widely exploited by agriculture and livestock activities, is characterized by a reduced area of riparian vegetation, causing high turbidity of the water and the development of dense marginal aquatic vegetation, which enables the successful colonization by the representatives of the Gymnotiformes order.…”
Section: Discussionsupporting
confidence: 53%
“…61 Previous studies of several Neotropical fish species have reached similar conclusions, with a mean genetic divergence among congeners of *5%, 60 and exclusive alleles being found in many cases, confirming the low genetic variability found in these species. 62 Similar values were recorded in the basin of the Itapecuru River, 63 in northeastern Brazil, which permitted the reliable identification of 92.19% of the fish species, with interspecific differences of <3% in most cases, demonstrating considerable potential for the discrimination of cryptic species. In the present study, the variation found among congeners was much FIG.…”
Section: Discussionsupporting
confidence: 63%
“…Among the species found in Paraná River and Coastal Rivers basins, cytogenetic reports are available for Gymnotus carapo (LINNAEUS 1758) (2n = 54), Gymnotus inaequilabiatus (VALENCIENNES 1839) (2n = 52), Gymnotus sylvius (ALBERT and FERN-ANDES-MATOLI 1999) (2n = 40) and Gymnotus pantherinus (STEINDACHNER 1908) (2n = 52) (FERNANDES-MATIOLI et al 2001). Such variation in the chromosomal number from 2n = 40 to 2n = 54, coupled with the fact that speciation events leading to the origin of some Gymnotus species are considered to be recent (REZENDE et al 2009), make the genus an excellent material to study the occurrence of chromosomal rearrangements in the evolutionary history of this fi sh group.…”
Section: Introductionmentioning
confidence: 99%