| Autor: |
Bochkarev, Nickolai A., Zuykova, Elena I., Abramov, Sergey A., Podorozhnyuk, Elena V., Politov, Dmitry V. |
| Zdroj: |
Fundamental and Applied Limnology : Archive fuer Hydrobiologie; February 2017, Vol. 189 Issue: 3 p193-207, 15p |
| Abstrakt: |
Data on morphology, biology and the molecular-genetic variability of theCoregonus ussuriensis(CU) and chadary whitefishC. chadary(Teleostei: Salmoniformes: Coregonidae) (CW) from the upstream and down- stream reaches of the Amur River drainage are presented. These species differ in growth rate and morphological traits. Analysis of feeding has shown that CU is euryphagous, although during the summer this species has a signifi- cant proportion of fish and insect imago in its diet. Its habits considerably differ from the ecological niche of CW and otherpidschian-like whitefishes inhabiting the water bodies of the southern part of Siberia. We have confirmed reliable distinctions between CU and CW in the numbers of gill raker and lateral line scales. The comparative analysis of the morphometric traits showed that a body shape ofC. ussuriensisdiffers both frompidschian-like whitefishes and fromC. chadary. The phylogenetic relationships among mtDNA haplotypes were reconstructed based on variability in mitochondrial genes 16 S–ND1 and ND3. TheCoregonusspecies from the Amur River form a monophyletic clade sister to Lake Baikal omul and whitefishes lineage, with two distinct groups corresponding with two studied species. On the basis of our data, we suggest the hypotheses of sympatric and allopatric origins of these species. Two extantCoregonusspecies could have originated from: (i) a single ancestral whitefish related to Lake Baikal coregonids or (ii) two independent allopatric (Baikalian and south Siberianpidschian-like) forms that migrated to the Amur River basin, presumably asynchronously, with the subsequent hybridization and introgression that could have resulted in the complete replacement of mitochondrial DNA. |
| Databáze: |
Supplemental Index |
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