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Allozymic Characterization of Scottish and Aegean Populations of Nephrops Norvegicus

Published online by Cambridge University Press:  11 May 2009

Marco Passamonti
Affiliation:
Dipartimento di Biologia Evoluzionistica Sperimentale, Universita di Bologna, via Selmi 3, 40126 Bologna, Italy.
Barbara Mantovani
Affiliation:
Dipartimento di Biologia Evoluzionistica Sperimentale, Universita di Bologna, via Selmi 3, 40126 Bologna, Italy.
Valerio Scali
Affiliation:
Dipartimento di Biologia Evoluzionistica Sperimentale, Universita di Bologna, via Selmi 3, 40126 Bologna, Italy.
Carlo Froglia
Affiliation:
CNR - IRPEM, Molo Mandracchio, 60125 Ancona, Italy

Extract

One Scottish and two Aegean samples of Nephrops norvegicus (Crustacea: Decapoda) were allozymically tested using a total of 110 individuals and compared with two already characterized Adriatic populations. Three main characteristics of their genetic structure emerge: a highly homogeneous allele pattern, a strong heterozygote deficiency at some loci and a significant genotypic variance among populations, mainly caused by the Pgm locus. Population subdivision, intraunit inbreeding, bottlenecks and selective constraints are taken into account to allow for these genetic features, although none of them proved decisive. The search for straightforward characters differentiating Norway lobsters of geographically different areas proved unsuccessful, although a significant genotypic differentiation was noticed among our samples. Observed D values among the geographically distant samples indicate a very low genetic divergence, so that no clear phyletic conclusions can be traced on the sole allozyme-gene analysis.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1997

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