Levels of intra-host and temporal sequence variation in a large <Emphasis Type="Italic">CO</Emphasis>1 sub-units from <Emphasis Type="Italic">Anisakis simplex sensu stricto</Emphasis> (Rudolphi 1809) (Nematoda: Anisakisdae): implications for fisheries management |
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Authors: | M A Cross C Collins N Campbell P C Watts J C Chubb C O Cunningham E M C Hatfield K MacKenzie |
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Institution: | (1) Biological Sciences Institute, University of Dundee, Dundee, DD1 4HN, Scotland, UK;(2) FRS Marine Laboratory, P.O. Box 101, 375 Victoria Road, Aberdeen, AB11 9DB, Scotland, UK;(3) School of Biological Sciences, Biosciences Building, Liverpool University, Crown Street, Liverpool, L69 7ZB, UK;(4) School of Biological Sciences (Zoology), University of Aberdeen, Aberdeen, AB24 2TZ, Scotland, UK |
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Abstract: | This paper is the first to address the suitability and potential of the cytochrome oxidase-1 (CO1) region of the parasitic marine nematode Anisakis simplex sensu stricto as a genetic marker. A. simplex s.s. is an ubiquitous parasite of many marine organisms and has been used as a ‘biological tag’ for population studies of pelagic
fish stocks. The CO1 marker informs not only about nematode population structure but also about its hosts. The large CO1 sub-unit (∼800 bp) was analysed from third stage larvae of A. simplex s.s. from Atlantic herring, Clupea harengus L. caught off the north-west coast of Scotland. In total 161 A. simplex s.s.
CO1 sequences were analysed from 37 herring that represented three spawning periods over 2 years. Overall very high haplotype
and low nucleotide diversities were observed (h = 0.997 and π = 0.008, respectively). These results are in keeping with studies investigating parasitic nematodes of ungulates
and are symptomatic of the high rate of substitutions accumulated by mtDNA and effective dispersal strategies of the parasite.
The Tamura-Nei I + Г (Г = 1.2243) model of nucleotide substitution best suited the present data which were dominated by a high thymine bias and associated
transitions. Large within population differences were highlighted by hierarchal AMOVAs with little variation related to spawning
events or years which may indicate localised temporal stability. Temporal homogeneity in the CO1 gene coupled with the ubiquitous and widespread nature of the parasite indicates both the potential and limitations for
its incorporation in stock-separation studies of its hosts.
This work was carried out at the School of Biological Sciences, Liverpool University, Crown Street, Liverpool. L69 7ZB, UK. |
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