NDLI: Connectivity and genetic structure of the queen conch on the Mesoamerican Reef

Content Provider	Springer Nature Link
Author	Machkour M’Rabet, Salima Cruz Medina, Jorge García De León, Francisco J. Jesús Navarrete, Alberto Hénaut, Yann
Copyright Year	2017
Abstract	The queen conch (Strombus gigas) is a commercially important marine invertebrate that is widely distributed throughout the western Atlantic, from Bermuda to Brazil. Intense exploitation has resulted in a decrease in population numbers of this species, which is listed as protected from commercial exploitation under IUCN and CITES. Previous studies on population genetics have demonstrated contrasting results in terms of the population structure of S. gigas. This research analyzed the genetic connectivity of the queen conch over a wide area of the Mesoamerican Reef System to determine whether S. gigas presents one panmictic population or a more complex structure. Furthermore, we evaluated the risk of local extinction by establishing the genetic diversity of the studied populations. High resolution was obtained for the five ISSR markers used for a total of 190 individuals, from seven localities along the Mesoamerican Reef. Our results reject the panmictic structure hypothesis for the queen conch in the study area and demonstrate genetic patchiness, indicating general homogeneity among localities that present an isolation-by-distance pattern. However, some genetic temporal variation was confirmed for the Cozumel locality. Furthermore, our results reveal self-recruitment for the Alacranes Reef aggregation and suggest sufficient connectivity with localities on the Caribbean coast to maintain high genetic diversity. With regard to genetic diversity, the results demonstrate that the queen conch is not genetically threatened in the study area. This is probably due to high annual recruitment within Caribbean queen conch aggregations, and suggests that S. gigas is a highly resilient organism. We advocate that the appropriate management of S. gigas (fishing quota and/or closed season) must be followed to attain a rapid recovery of queen conch populations. This study represents a fundamental step in the understanding of the dynamic population structure of S. gigas in the Mesoamerican Reef and is an important contribution toward improving the future management of this commercially protected species.
Starting Page	535
Ending Page	548
Page Count	14
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	36
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-02-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Population structure Genetic diversity Connectivity ISSR Spatial autocorrelation Marine gastropod Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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