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Allozyme analysis of geographical and seasonal variation of Illex coindetii (Cephalopoda: Ommastrephidae) from central Mediterranean and Iberian Atlantic

Published online by Cambridge University Press:  21 February 2005

P. Martínez
Affiliation:
Xenética Evolutiva Molecular, Facultade de Ciencias-Bioloxía, Universidade de Vigo, E-36200, Spain Instituto Nacional de Toxicología, Luis Cabrera 9, 28002 Madrid, Spain, E-mail: pilarm.fernandez@mju.es
P. Belcari
Affiliation:
Dipartamento Scienze Uomo e Ambiente, Universita di Pisa, 56126 Pisa, Italy
A. Sanjuan
Affiliation:
Xenética Evolutiva Molecular, Facultade de Ciencias-Bioloxía, Universidade de Vigo, E-36200, Spain
A. Guerra
Affiliation:
ECOBIOMAR, Instituto de Investigaciones Marinas, CSIC, Eduardo Cabello, 6, Vigo, E-36208, Spain

Abstract

Previous morphological studies of Illex coindetii from the Mediterranean have shown both juvenile and mature individuals all year round suggesting an homogeneous population pattern, however, seasonal spawning variation seems to exist varying with geographical area. Present work analysed 240 individuals from the northern Tyrrhenian and Atlantic Iberian waters at the four year-round seasons using 33 presumptive enzyme-coding loci to compare geographical and temporal variances. Genetic variability was low (Ho=0·02–0·04). Moderate variation at some loci was found due to both temporal and geographical factors (12% of total genetic variance) and to temporal variance (FST=0·004–0·015). Unweighted pair-group method using arithmetric averages (UPGMA) and Multidimensional scaling–minimum spanning tree (MDS–MST) analyses after Cavalli-Sforza & Edwards (1967) chord genetic distances showed the summer Italian and the spring Atlantic samples as the most divergent among the whole.

Type
Research Article
Copyright
2005 Marine Biological Association of the United Kingdom

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