Allozyme comparison of two populations of Rineloricaria (Siluriformes, Loricariidae) from the Ivaí River, upper Paraná River basin, Brazil

Limeira, Daniel M.; Renesto, Erasmo; Zawadzki, Cláudio Henrique

doi:10.1590/s1415-47572009005000022

Cited by 7 publications

(2 citation statements)

References 12 publications

(20 reference statements)

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“…For example, Zawadzki et al (2008b) found no fixed diagnostic markers for three populations of Hypostomus regani from the Corumbá River, Itaipu Reservoir (both in the upper Paraná River basin) and Manso River (in the Paraguay River basin). Similarly, Limeira et al (2009) found no fixed markers in two populations of Rineloricaria pentamaculata above and below an 80 m high waterfall on the Ivaí River. Strieder et al (2009) also found no fixed markers for four populations of N. yapo along tributaries of the Tibagi and Pirapó rivers.…”

Section: Discussionmentioning

confidence: 94%

Allozyme differentiation of two populations of the genus Neoplecostomus Eigenmann & Eigenmann, 1888 (Teleostei, Loricariidae) from the upper Paraná River basin, Brazil

et al. 2011

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Allozyme electrophoresis was used to examine 12 enzymatic systems in two populations of the genus Neoplecostomus from the Paraná River basin. Samples of Neoplecostomus sp. 1 were collected in Paraitinguinha stream of the Tietê River basin, in the municipality of Salesópolis, São Paulo State, and those of Neoplecostomus sp. 2 from São Domingos stream of the Rio Grande River basin, in the municipality of Muzambinho, Minas Gerais State. The genetic variability of the two populations was estimated by Nei’s expected heterozygosity and was considered lower than average for populations of freshwater fish. The proportion of polymorphic loci was low (only 5.26% for the locus Idh). The low frequency of heterozygosity for both populations revealed a high fixation of alleles for each locus. Homozygote excess was observed in both populations. The values of Nei’s genetic identity and the presence of loci with different allele frequencies in both populations may imply that the two populations belong to different species. The genetic variability between populations was compared to other data for loricariids.

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Section: Discussionmentioning

confidence: 94%

Allozyme differentiation of two populations of the genus Neoplecostomus Eigenmann & Eigenmann, 1888 (Teleostei, Loricariidae) from the upper Paraná River basin, Brazil

et al. 2011

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“…Although less commonly employed in recent years, they continue to be a useful tool for biologists (Larsson et al 2007;Zawadzki et al 2008;Erdogan et al 2009, Lemeira et al 2009Sanz et al 2009) and at times techniques that use allozymes may be the only suitable way to differentiate some populations (Brunelli et al 2008).…”

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confidence: 99%

Differential Survival amongsSOD‐1*Genotypes in Chinook Salmon

et al. 2011

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Differential survival and growth were tested in Chinook salmon Oncorhynchus tshawytscha expressing two common alleles, *–100 and *–260, at the superoxide dismutase locus (sSOD‐1*). These tests were necessary to support separate studies in which the two alleles were used as genetic marks under the assumption of mark neutrality. Heterozygous adults were used to produce progeny with –100/–100, –100/–260, and –260/–260 genotypes that were reared in two natural streams and two hatcheries in the states of Washington and Oregon. The latter also were evaluated as returning adults. In general, the genotype ratios of juveniles reared at hatcheries were consistent with high survival and little or no differential survival in the hatchery. Adult returns at one hatchery were significantly different from the expected proportions, and the survival of the –260/–260 genotype was 0.56–0.89 times that of the –100/–100 genotype over four year‐classes. Adult returns at a second hatchery (one year‐class) were similar but not statistically significant: survival of the –260/–260 genotype relative to the –100/–100 genotype was 0.76. The performance of the heterozygote group was intermediate at both hatcheries. Significant differences in growth were rarely observed among hatchery fish (one year‐class of juveniles and one age‐class of adult males) but were consistent with greater performance for the –100/–100 genotype. Results from two groups of juveniles reared in streams (one year‐class from each stream) suggested few differences in growth, but the observed genotype ratios were significantly different from the expected ratios in one stream. Those differences were consistent with the adult data; survival for the –260/–260 genotype was 76% of that of the –100/–100 genotype. These results, which indicate nonneutrality among sSOD‐1* genotypes, caused us to modify our related studies and suggest caution in the interpretation of results and analyses in which allozyme marks are assumed to be neutral.

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Characterization of Genetic Resources

Hilsdorf

Hallerman

2017

Genetic Resources of Neotropical Fishes

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Allozyme comparison of two populations of Rineloricaria (Siluriformes, Loricariidae) from the Ivaí River, upper Paraná River basin, Brazil

Cited by 7 publications

References 12 publications

Allozyme differentiation of two populations of the genus Neoplecostomus Eigenmann & Eigenmann, 1888 (Teleostei, Loricariidae) from the upper Paraná River basin, Brazil

Allozyme differentiation of two populations of the genus Neoplecostomus Eigenmann & Eigenmann, 1888 (Teleostei, Loricariidae) from the upper Paraná River basin, Brazil

Differential Survival amongsSOD‐1*Genotypes in Chinook Salmon

Characterization of Genetic Resources

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