Intra- or inter-specific difference in genotypes of Caligus elongatus Nordmann 1832? |
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Authors: | Øivind Øines Thomas Schram |
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Institution: | (1) Section for Parasitology, National Veterinary Institute, P.O. Box 8156 Dep., Oslo, Norway;(2) Department of Biology, University of Oslo, P.O. Box 1066, Blindern, Oslo, Norway |
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Abstract: | Two mitochondrial and one nuclear genetic marker were used to study the phylogenetic position of the two reported CO1-genotypes
of Caligus elongatus in a group of closely related caligid parasites. Molecular analysis of the two mitochondrial genes (CO1 and 16S), indicate
genetic distances of the two C. elongatus genotypes in the lower range of distances previously reported between other crustacean species, but higher than comparable
reported within-species differences. Analyses of nuclear 18S sequences indicate no detectable differentiation between these
genotypes, but may be due to expected differences in the resolution of these genetic markers. Investigation of two of three
selected morphological characters reveals phenotypes supporting the division based on the molecular division. The species
status on the two C. elongatus genotypes cannot be drawn conclusively, although the molecular and morphological data presented here suggests the presence
of sibling species. |
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Keywords: | Parasitic copepod Caligus elongatus phylogeny 16S CO1 18S |
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