[Unidirectional Hybridization of Kaluga Acipenser dauricus Georgi, 1775 and Amur Sturgeon Acipenser schrenckii Brandt, 1869, Inferred from the Mitochondrial DNA Genotyping of Their Natural Hybrids].
Identifieur interne : 000080 ( PubMed/Corpus ); précédent : 000079; suivant : 000081[Unidirectional Hybridization of Kaluga Acipenser dauricus Georgi, 1775 and Amur Sturgeon Acipenser schrenckii Brandt, 1869, Inferred from the Mitochondrial DNA Genotyping of Their Natural Hybrids].
Auteurs : S V Shedko ; M B ShedkoSource :
- Genetika [ 0016-6758 ] ; 2016.
English descriptors
- KwdEn :
- MESH :
- chemical : DNA, Mitochondrial.
- genetics : Fishes.
- Animals, Haplotypes, Hybridization, Genetic, Polymorphism, Genetic.
Abstract
In 2009 through 2011, among 730 individuals of kaluga and Amur sturgeon collected in the lower reaches of the Amur River and the Amursky Liman, 17 morphologically intermediate individuals (hybrids) with the body length of 56 to 202 cm (median, 81 cm) were identified, including 11 individuals (4.6%) found in 2009, three individuals (1.6%) found in 2010, and three individuals (1.1%), in 2011. In 16 hybrids 819 bp of the mtDNA control regions were sequences and 11 haplotypes were identified. Since all these haplotypes were from the mtDNA lineages of kaluga, it was concluded that hybridization occurred in one direction, kaluga (♀) x Amur sturgeon (♂). This asymmetry could be caused by the large difference in sizes of these species. Since the earlier examined morphologically typical Amur sturgeons showed the absence of alien haplotypes (Shedko, et al., 2015), the absence of the mtDNA introgression is claimed. This can be caused by low viability or sterility of the backcross females (kaluga (♀) x Amur sturgeon (♂)) x Amur sturgeon (♂). The samples of hybrids and typical kaluga individuals demonstrated no differences in the frequency spectra of the mtDNA haplotypes. However, haplotype and nucleotide diversity in the first sample was somewhat higher than in the second one (0.950 versus 0.927 and 0.0054 versus 0.0044, respectively). The data obtained will be useful for population monitoring of kaluga and Amur sturgeon, Amur River endemics, which are classified as critically endangered by the IUCN Red List of Threatened Species.
PubMed: 27281853
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pubmed:27281853Le document en format XML
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<front><div type="abstract" xml:lang="en">In 2009 through 2011, among 730 individuals of kaluga and Amur sturgeon collected in the lower reaches of the Amur River and the Amursky Liman, 17 morphologically intermediate individuals (hybrids) with the body length of 56 to 202 cm (median, 81 cm) were identified, including 11 individuals (4.6%) found in 2009, three individuals (1.6%) found in 2010, and three individuals (1.1%), in 2011. In 16 hybrids 819 bp of the mtDNA control regions were sequences and 11 haplotypes were identified. Since all these haplotypes were from the mtDNA lineages of kaluga, it was concluded that hybridization occurred in one direction, kaluga (♀) x Amur sturgeon (♂). This asymmetry could be caused by the large difference in sizes of these species. Since the earlier examined morphologically typical Amur sturgeons showed the absence of alien haplotypes (Shedko, et al., 2015), the absence of the mtDNA introgression is claimed. This can be caused by low viability or sterility of the backcross females (kaluga (♀) x Amur sturgeon (♂)) x Amur sturgeon (♂). The samples of hybrids and typical kaluga individuals demonstrated no differences in the frequency spectra of the mtDNA haplotypes. However, haplotype and nucleotide diversity in the first sample was somewhat higher than in the second one (0.950 versus 0.927 and 0.0054 versus 0.0044, respectively). The data obtained will be useful for population monitoring of kaluga and Amur sturgeon, Amur River endemics, which are classified as critically endangered by the IUCN Red List of Threatened Species.</div>
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<Abstract><AbstractText>In 2009 through 2011, among 730 individuals of kaluga and Amur sturgeon collected in the lower reaches of the Amur River and the Amursky Liman, 17 morphologically intermediate individuals (hybrids) with the body length of 56 to 202 cm (median, 81 cm) were identified, including 11 individuals (4.6%) found in 2009, three individuals (1.6%) found in 2010, and three individuals (1.1%), in 2011. In 16 hybrids 819 bp of the mtDNA control regions were sequences and 11 haplotypes were identified. Since all these haplotypes were from the mtDNA lineages of kaluga, it was concluded that hybridization occurred in one direction, kaluga (♀) x Amur sturgeon (♂). This asymmetry could be caused by the large difference in sizes of these species. Since the earlier examined morphologically typical Amur sturgeons showed the absence of alien haplotypes (Shedko, et al., 2015), the absence of the mtDNA introgression is claimed. This can be caused by low viability or sterility of the backcross females (kaluga (♀) x Amur sturgeon (♂)) x Amur sturgeon (♂). The samples of hybrids and typical kaluga individuals demonstrated no differences in the frequency spectra of the mtDNA haplotypes. However, haplotype and nucleotide diversity in the first sample was somewhat higher than in the second one (0.950 versus 0.927 and 0.0054 versus 0.0044, respectively). The data obtained will be useful for population monitoring of kaluga and Amur sturgeon, Amur River endemics, which are classified as critically endangered by the IUCN Red List of Threatened Species.</AbstractText>
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