Journal article
Introgressive hybridisation between two widespread sharks in the east Pacific region
Molecular Phylogenetics and Evolution, Vol.136, pp.119-127
07/2019
PMID: 30981810
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Source: InCites
Abstract
With just a handful of documented cases of hybridisation in cartilaginous fishes, shark hybridisation remains poorly investigated. Small amounts of admixture have been detected between Galapagos (Carcharhinus galapagensis) and dusky (Carcharhinus obscurus) sharks previously, generating a hypothesis of ongoing hybridisation. We sampled a large number of individuals from areas where the species co-occur (contact zones) across the Pacific Ocean and used both mitochondrial and nuclear-encoded SNPs to examine genetic admixture and introgression between the two species. Using empirical analytical approaches and simulations, we first developed a set of 1873 highly informative SNPs for these two species to evaluate the degree of admixture between them. Overall, results indicate a high discriminatory power of nuclear SNPs (FST = 0.47, p < 0.05) between the two species, unlike mitochondrial DNA (ΦST = 0.00 p > 0.05), which failed to differentiate these species. We identified four hybrid individuals (∼1%) and detected bi-directional introgression between C. galapagensis and C. obscurus in the Gulf of California along the east Pacific coast of the Americas. We emphasize the importance of including a combination of mtDNA and diagnostic nuclear markers to properly assess species identification, detect patterns of hybridisation, and better inform management and conservation of these sharks, especially given the morphological similarities within the genus Carcharhinus.
Details
- Title
- Introgressive hybridisation between two widespread sharks in the east Pacific region
- Creators
- Diana A Pazmiño - Universidad San Francisco de QuitoLynne van Herderden - James Cook UniversityColin A Simpfendorfer - James Cook UniversityClaudia Junge - University of AdelaideStephen C Donnellan - University of AdelaideE. Mauricio Hoyos-Padilla - Pelagios-Kakunjá A.C.Clinton A.J Duffy - Auckland War Memorial MuseumCharlie Huveneers - Flinders UniversityBronwyn M Gillanders - University of AdelaidePaul A Butcher - NSW Department of Primary IndustriesGregory E Maes - James Cook University
- Publication Details
- Molecular Phylogenetics and Evolution, Vol.136, pp.119-127
- Publisher
- Academic Press
- Grant note
- We are extremely grateful to the Galápagos National Park for providing valuable tissue samples, and for granting the permit to collect and export samples from the Galápagos Islands (permit number 065-2013PNG and 014-2014PNG). For laboratory, analytical, and logistic support we thank Ivany Argueta, Stefano Montanari, and the Molecular Ecology and Evolutionary Laboratory (MEEL). Dusky shark samples from Coffs Harbour were collected as part of a Fisheries Research and Development Corporation project (FRDC grant number 2010/062). Finally, we thank and acknowledge the effort of Matias Braccini, Grant Johnson (from the Northern Territory Fisheries), Geremy Cliff, Scott Cutmore, and Mark Scott who collected and shared samples from Western Australia, Northern Territory, South Africa, Moreton Bay and Norfolk Island, respectively. This work was supported by the Ecuadorian Government, who funded this research through the National Secretary of Higher Education, Science and Technology (SENESCYT) scholarship. An ARC Linkage grant (grant number LP120100652) to BMG, CH and SCD funded the C. obscurus research.
- Identifiers
- 991012925477302368
- Copyright
- © 2019 Published by Elsevier Inc. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; National Marine Science Centre
- Language
- English
- Resource Type
- Journal article