Microtaxonomy of fragmenting Enchytraeus species using molecular markers, with a comment on species complexes in enchytraeids

Autor(en): Collado, Rut
Hass-Cordes, Eva
Schmelz, Ruediger M.
Stichwörter: Annelida; BIGEMINUS; Clitellata; Cryptic species; DIVERSITY; Enchytraeidae; Enchytraeus bigeminus group; FRIDERICIA; JAPONENSIS; molecular diversity; OLIGOCHAETA; POLYCHAETA; REGENERATION; REPRODUCTION; TAXONOMY; TERRESTRIAL; Zoology
Erscheinungsdatum: 2012
Herausgeber: TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY
Journal: TURKISH JOURNAL OF ZOOLOGY
Volumen: 36
Ausgabe: 1
Startseite: 85
Seitenende: 94
Zusammenfassung: 
Populations of Enchytraeus that reproduce by fragmentation are distributed worldwide, but their species-level taxonomy is unresolved because morphological differences are inconclusive. Therefore, we compared the isozyme and RAPD-PCR patterns of 5 populations of fragmenting enchytraeids from widely distant localities (Japan, Iran, Greece, and Brazil). Among these populations, 3 were identified (E. japonensis, E. bigeminus, and E. dudichi) and 2 were unidentified. Multiple isozyme bands suggested polyploidy in all investigated populations. In all RAPD-PCR algorithms except 1, the fragmenting group formed a cluster separate from 2 nonfragmenting Enchytraeus species. All 5 populations were clearly separable on the levels of protein and DNA, but the unidentified Greek populations clustered more closely with E. japonensis. It remains unknown whether the fragmenting group in Enchytraeus is monophyletic or polyphyletic. Although every investigated population may deserve species rank, a consistent classification is impossible at present.
ISSN: 13000179
DOI: 10.3906/zoo-1002-70

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