Estimation of the genetic diversity and effective size of the population of the wedge clam Donax trunculus of the Doñana National Park and its contribution to unprotected areas

Rico, Ciro and Drake, Pilar and Macpherson, Enrique and Cuesta, Jose A. (2016) Estimation of the genetic diversity and effective size of the population of the wedge clam Donax trunculus of the Doñana National Park and its contribution to unprotected areas. In: Research Projects in National Parks: 2010-2013. Organismo Autonomo Parques Nacionales, Madrid, pp. 177-192. ISBN 978-84-8014-898-6

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Abstract

We have studied seven populations of the wedge clam Donax trunculus, distributed throught the Spanish
Atlantic and Mediterranean coasts. A comparative analysis of size and density was performed
from a sample obtained from a commercially exploited population from Isla Canela, and from another
population which is managed under a strict plan using only artisanal hand dredging from the beach of
the Doñana National Park showing that the management carried out in the Doñana National Park is
correct and allows sustainable fisheries. Twenty one microsatellite loci were isolated and characterized
in D. trunculus of which 16 were polymorphic and codominant. At least 12 of them have high frequencies
of null alleles in all populations, and the rest in most populations. All collected samples were genotyped
with these 16 loci and genetic diversity indices, tests of disequiibrium, fixation indices and
probabilities of genetic differentiation among localities were determined. The odds of assignment to
the sampling location were also determined. Several analyses were conducted to determine the potential
causes for the deviations from Hardy-Weinberg equilibrium which shown that they were mainly due
to the presence of null alleles. Furthermore, using the ribosomal internal transcribed spacer it was determined
that the commercially exploited populations of the wedge clam under the specific name Donax
trunculus are actually a mixture of a hybrid and non-hybrid species. The analysis of the genetic structure
made both to all individuals and separately for hybrid and non-hybrid individuals showed four genetically
distinct populations in the Spanish coast. The first in the Cantabric Sea, the second in the Gulf
of Cadiz, the third from the Strait of Gibraltar to Cabo de Gata and the last one from the Cabo de Gata
to the Gulf of Rosas.

Item Type:	Book Chapter
Subjects:	Q Science > Q Science (General)
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Marine Studies
Depositing User:	Fulori Nainoca - Waqairagata
Date Deposited:	27 Jul 2017 03:32
Last Modified:	27 Jul 2017 03:32
URI:	https://repository.usp.ac.fj/id/eprint/10036

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