Low genetic diversity of sharks: natural patterns or induced by exploitation?

Abstract

Event Abstract Back to Event Low genetic diversity of sharks: natural patterns or induced by exploitation? Fernando F. Mendonça1*, Rui Coelho2, Miguel N. Santos2, Bruno A. De-Franco1, Bruno L. Ferrette1, Millke Morales3, Juliana De-Biasi1, Sâmia M. Camargo1, Carolina Magalhães3, Claudio Oliveira3 and Fausto Foresti3 1 São Paulo Federal University, Marine Sciences, Brazil 2 Instituto Português do Mar e da Atmosfera, IPMA, Portugal 3 São Paulo State University, Morfology, Brazil Genetic diversity patterns are extremely relevant components in management plans on threatened species. However, such evaluations typically determine the current variation of this diversity without being able to characterize the magnitude of loss over the time. Considering the increasing number of sharks that have been included in the IUCN Red List of Threatened Species, without prior reviews about the molecular diversity could have been made, we present a comparison of these parameters, using sequences of the control region mitochondrial DNA of 1.016 sharks belonging to three endangered pelagic species (Carcharhinus longimanus, Alopias superciliosus and Sphyrna zygaena) and three not currently threatened (Prionace glauca, Galeocerdo cuvier and Carcharhinus leucas) from the Atlantic Ocean, of regions without signs of population genetic structure. As a result, among the endangered species was observed average nucleotide diversity π=0.00144 and haplotype Hd=0.415. Among the species not threatened such indexes were π=0.00306 and Hd=0753, 53% higher for nucleotide diversity and 45% higher for the haplotype diversity with respect to endangered species. Assessing the diversity loss of a population would imply the use of historical samples collected before population declines. However, this finding of different levels of genetic diversity in endangered species may mean that in sharks the genetic variability might not be naturally low as previously assumed, but may also be the effect of population declines due to human exploitation. Thus, the evolutionary potential of many species of sharks may become compromised even before detecting situations of population collapses. Acknowledgements Finnacial support: FAPESP 2011/23787-0 and CNPq 470762/2013 Keywords: conservation genetics, molecular diversity, endangered pelagic sharks species, control region mitochondrial DNA, Carcharhinus longimanus, Alopias superciliosus, Sphyrna zygaena, Prionace glauca, Galeocerdo cuvier, Carcharhinus leucas Conference: XIX Iberian Symposium on Marine Biology Studies, Porto, Portugal, 5 Sep - 9 Sep, 2016. Presentation Type: Poster Presentation Topic: 1. ECOLOGY, BIODIVERSITY AND VULNERABLE ECOSYSTEMS Citation: Mendonça FF, Coelho R, Santos MN, De-Franco BA, Ferrette BL, Morales M, De-Biasi J, Camargo SM, Magalhães C, Oliveira C and Foresti F (2016). Low genetic diversity of sharks: natural patterns or induced by exploitation?. Front. Mar. Sci. Conference Abstract: XIX Iberian Symposium on Marine Biology Studies. doi: 10.3389/conf.FMARS.2016.05.00109 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 19 Apr 2016; Published Online: 03 Sep 2016. * Correspondence: Prof. Fernando F Mendonça, São Paulo Federal University, Marine Sciences, Santos, SP, 11030-400, Brazil, fernandoffm@yahoo.com.br Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Fernando F Mendonça Rui Coelho Miguel N Santos Bruno A De-Franco Bruno L Ferrette Millke Morales Juliana De-Biasi Sâmia M Camargo Carolina Magalhães Claudio Oliveira Fausto Foresti Google Fernando F Mendonça Rui Coelho Miguel N Santos Bruno A De-Franco Bruno L Ferrette Millke Morales Juliana De-Biasi Sâmia M Camargo Carolina Magalhães Claudio Oliveira Fausto Foresti Google Scholar Fernando F Mendonça Rui Coelho Miguel N Santos Bruno A De-Franco Bruno L Ferrette Millke Morales Juliana De-Biasi Sâmia M Camargo Carolina Magalhães Claudio Oliveira Fausto Foresti PubMed Fernando F Mendonça Rui Coelho Miguel N Santos Bruno A De-Franco Bruno L Ferrette Millke Morales Juliana De-Biasi Sâmia M Camargo Carolina Magalhães Claudio Oliveira Fausto Foresti Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.