Morphotypes and genetic diversity of Dendrobaena schmidti (Lumbricidae, Annelida).

Autor:	Shekhovtsov SV; Institute of Cytology and Genetics of Suberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia Institute of Biological Problems of the North of Far Eastern Branch of the Russian Academy of Sciences, Magadan, Russia Novosibirsk State University, Novosibirsk, Russia., Rapoport IB; Tembotov Institute of Ecology of Mountain Territories of the Russian Academy of Sciences, Nalchik, Russia., Poluboyarova TV; Institute of Cytology and Genetics of Suberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia Institute of Biological Problems of the North of Far Eastern Branch of the Russian Academy of Sciences, Magadan, Russia., Geraskina AP; Center for Forest Ecology and Productivity of the Russian Academy of Sciences, Moscow, Russia., Golovanova EV; Omsk State Paedagogical University, Omsk, Russia., Peltek SE; Institute of Cytology and Genetics of Suberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.
Jazyk:	angličtina
Zdroj:	Vavilovskii zhurnal genetiki i selektsii [Vavilovskii Zhurnal Genet Selektsii] 2020 Feb; Vol. 24 (1), pp. 48-54.
DOI:	10.18699/VJ20.594
Abstrakt:	Dendrobaena schmidti (Michaelsen, 1907) is a polymorphic earthworm species from the Caucasus and adjacent regions. Adult D. schmidti individuals have highly variable body size (from 1.5 to well over 10 cm) and color (from dark purple to total lack of pigmentation), so a lot of subspecies of D. schmidti have been described; however, the existence of most of them is currently under dispute. We studied the genetic diversity of D. schmidti from seven locations from the Western Caucasus using mitochondrial (a fragment of the cytochrome oxidase I gene) and nuclear (internal ribosomal transcribed spacer 2) DNA. For both genes studied, we found that our sample was split into two groups. The first group included somewhat bigger (3-7.5 cm) individuals that were only slightly pigmented or totally unpigmented (when fixed by ethanol). The second group contained small (1.7-3.5 cm) specimens with dark purple pigmentation. In one of the studied locations these two groups were found in sympatry. However, there were no absolute differences either in general appearance (pigmented/unpigmented, small/big) or among diagnostic characters. Although the two groups differed in size (the majority of individuals from the first group were 5-6 cm long, and of the second one, 2-3 cm), the studied samples overlapped to a certain degree. Pigmentation, despite apparent differences, was also unreliable, since it was heavily affected by fixation of the specimens. Thus, based on the obtained data we can conclude that D. schmidti consists of at least two species that have identical states of diagnostic characters, but differ in general appearance. (Copyright © AUTHORS, 2018.)
Databáze:	MEDLINE
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