[OANNES Foro] Hierarchical analysis of the population genetic structure in Concholepas concholepas

[Mario Cabrejos]

Marine Ecology

 <http://onlinelibrary.wiley.com/doi/10.1111/maec.2016.37.issue-2/issuetoc>
Volume 37, Issue 2, pages 359–369, April 2016

Article first published online: 22 DEC 2015

DOI: 10.1111/maec.12286


 


 


Hierarchical analysis of the population genetic structure in Concholepas
concholepas, a marine mollusk with a long-lived dispersive larva


1.     Leyla Cárdenas1,*, Juan Carlos Castilla2 and Frédérique Viard3,4

1 Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias,
Universidad Austral de Chile, Valdivia, Chile 2 Facultad de Ciencias
Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile 3
CNRS, team diversity and connectivity of coastal marine landscapes, Station
Biologique de Roscoff, Roscoff, France 4 Sorbonne Universités, University
Pierre and Marie Curie Paris 06, UMR 7144, Station Biologique de Roscoff,
Roscoff, France. * Correspondence  Leyla Cárdenas E-mail:
<mailto:leylacardenas en uach.cl> leylacardenas en uach.cl


 


Abstract


For most marine invertebrate species, dispersal is achieved mainly or
exclusively by pelagic larvae. When the duration of the pelagic larval stage
is long, genetic homogeneity over large geographic scales is expected.
However, genetic structure has often been reported over small spatial
scales, suggesting that more complex processes occur than a simple positive
relationship between pelagic larval duration and gene flow. Concholepas
concholepas has a larval stage that can last up to 3 months in the water
column with a wide distributional range covering from 6°S to 56°S. We used a
hierarchical sampling technique to test if the genetic homogeneity of this
highly dispersive species is maintained throughout its total geographic
range in spite of environmental heterogeneity. In the three studied regions
(Antofagasta Bay, Valdivia and Patagonia), a spatial pattern of isolation by
distance in conjunction with a spatial genetic structure was observed.
Within each region, different spatial genetic patterns were detected. In
Antofagasta Bay and Valdivia there was evidence of substantial gene flow
among populations, whereas in Patagonia, populations showed genetic
structure and a unique, genetically isolated location was identified. These
results revealed the existence of spatial differences in the genetic
patterns among regions with different coastal topographies in C.
concholepas, and give us new insights into the inter-relationships of larval
dispersal potential, actual larval dispersal and physical processes.
Regarding the sustainable management of C. concholepas, two important issues
are derived from this study: (i) to highlight the need for a regional
context in the management of C. concholepas, (ii) to determine the
distinctiveness of the most austral population and to focus on the
conservation efforts due to the relevance of this area.

 



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