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MEPS 292:225-232 (2005)
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Abstract
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Genetic variation in the lesser flying squid Todaropsis eblanae (Cephalopoda, Ommastrephidae) in east Atlantic and Mediterranean waters
E. Dillane1,*, P. Galvin2, J. Coughlan1, M. Lipinski3, T. F. Cross1
1Department of Zoology, Ecology and Plant Science/Environmental Research Institute,National University of Ireland, Cork, Ireland
2Tyndall Institute, National University of Ireland, Cork, Ireland 3Marine and Coastal
Management Branch, DEAT, Private Bag X2, Roggebaai 8012, Cape Town, South Africa
*Email: e.dillane@ucc.ie
ABSTRACT: Samples of Todaropsis eblanae from throughout the species range in east Atlantic and Mediterranean waters were screened for genetic variability at 1 minisatellite and 4 microsatellite loci. Extremely high levels of variability were
observed within samples at all loci, with the mean observed heterozygosity per locus ranging from 0.82 to 0.91. Tests of allele frequency heterogeneity and measures of FST (Wright’s fixation index) suggest that significant genetic
differentiation occurs between samples taken in African waters and those taken in European waters (overall FST = 0.014, p < 0.001). Furthermore, significant differentiation was evident between the samples taken from South African waters and
those taken from off Mauritania (between sample FST = 0.012, p < 0.001). More subtle structuring was suggested within the European samples, largely attributable to differences between the Mediterranean sample and Atlantic samples (within
Europe FST = 0.002, p < 0.03). However, the high levels of heterozygosity associated with the examined loci means that biological implications of marginally significant statistical results must be considered. One consistent aspect of the
observed variation is that the Mauritanian sample is more genetically differentiated from European samples than from the more geographically isolated South African sample. Homoplasy and historical events such as climatic cycles and post-glacial
recolonisation are considered as possible explanations for the observed patterns of variation. In terms of stock structure, the findings suggest the presence of at least 3 genetically isolated populations in the east Atlantic, which has important
implications for management and sustainability of this resource.
KEY WORDS: Todaropsis eblanae · Squid · Microsatellites · Minisatellites · Population genetics · Fisheries · Stocks
Full text in pdf format
Published in MEPS Vol.
292
(2005) on May 12
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2005
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