DNA markers indicate that distinct spawning cohorts and aggregations of Patagonian squid, Loligo gahi, do not represent genetically discrete subpopulations

The Patagonian squid, Loligo gahi DOrbigny, has been described as having temporally and spatially identifiable spawning aggregations. Variation at six microsatellite loci was used to assess whether seasonal and geographical spawning groups around the Falkland Islands represent distinct sub-populatio...

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Bibliographic Details
Published in:Marine biology 2004-05, Vol.144 (5), p.961-970
Main Authors: SHAW, P. W, ARKHIPKIN, A. I, ADCOCK, G. J, BURNETT, W. J, CARVALHO, G. R, SCHERBICH, J. N, VILLEGAS, P. A
Format: Article
Language:English
Subjects:
Agnatha and pisces
Animal ethology
Animal populations
Biological and medical sciences
Deoxyribonucleic acid
DNA
Fundamental and applied biological sciences. Psychology
Genetic diversity
Hatching
Invertebrates
Islands
Loligo gahi
Marine
Marine biology
Psychology. Psychoanalysis. Psychiatry
Spawning
Subpopulations
Vertebrata
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Summary:The Patagonian squid, Loligo gahi DOrbigny, has been described as having temporally and spatially identifiable spawning aggregations. Variation at six microsatellite loci was used to assess whether seasonal and geographical spawning groups around the Falkland Islands represent distinct sub-populations. Genetic variation at these loci is high in this species (mean expected heterozygosity=0.87; mean number of alleles=14.7). No evidence of significantly different allele frequencies was found, either between samples from putative spawning cohorts or geographical areas, indicating that L.gahi around the Falkland Islands comprise a single genetically homogeneous population. Age structure analysis of samples (from statolith growth increments) indicated substantial spread in hatching dates among individuals of similar size and maturity status, suggesting the potential for extensive interbreeding between seasonal cohorts. A sample of L.gahi from the SE Pacific (Peru) displayed distinctly different gene frequencies (and allele size distribution at one locus) from SW Atlantic samples, supporting the suggestion that SE Pacific and SW Atlantic populations may represent distinct subspecies. [PUBLICATION ABSTRACT]
ISSN:0025-3162
1432-1793
DOI:10.1007/s00227-003-1260-z