Abstract:
:Allozyme electrophoresis was used to detect biological species of the E. gadi complex from gadids from the northern North Sea. A fixed difference at one of nine enzyme loci surveyed confirmed the existence of two reproductively isolated, sympatric species. Mixed infections of two E. gadi spp. (termed A and B) were observed in Gadus morhua and Pollachius virens. E. gadi sp. B was also found in Melanogrammus aeglefinus and Merlangius merlangus. The presence of gravid females of E. gadi spp. A and B in the same host species, P. virens, and sometimes in the same host individual, indicates that neither differential host-specificity nor seasonal differences in mating time are responsible for their reproductive isolation. Morphological study of probosces from electrophoretically identified specimens demonstrated that the two species can be discriminated in graphical and cluster analyses of hook morphometrics. E. gadi sp. I (of Vainola etal., 1994) and E. gadi sp. A are probably conspecific.
journal_name
Syst Parasitoljournal_title
Systematic parasitologyauthors
Wayland MT,Gibson DI,Sommerville Cdoi
10.1007/s11230-004-1388-3subject
Has Abstractpub_date
2005-02-01 00:00:00pages
139-49issue
2eissn
0165-5752issn
1573-5192journal_volume
60pub_type
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