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Seascape, genetic diversity and global population structure of the hammerhead shark Sphyrna zygaena

Grant number: 17/17605-3
Support type:Regular Research Grants
Duration: March 01, 2018 - February 29, 2020
Field of knowledge:Physical Sciences and Mathematics - Oceanography - Biological Oceanography
Principal Investigator:Fernando Fernandes Mendonça
Grantee:Fernando Fernandes Mendonça
Home Institution: Instituto de Saúde e Sociedade (ISS). Universidade Federal de São Paulo (UNIFESP). Campus Baixada Santista. Santos , SP, Brazil
Assoc. researchers:Diogo Teruo Hashimoto

Abstract

The increasing exploitation of sharks in the last decades has become a subject of international concern with estimates of population declines surpassing 90% in several species. Among these, the hammerhead shark Sphyrna zygaena is found all over the world, in temperate and tropical seas, being one of the largest and most widely distributed sharks of the genus. However, few data on population trends are currently available, despite the priorities established by the United Nations Convention on the Law of the Sea, of which Brazil is a part, for species of global distribution that are highly migratory. In this sense, the application of the state of the art in genomics, associated to the environmental patterns and characteristics, can contribute to the elucidation of several fundamental aspects for the biological knowledge, evolutionary history, distribution and local adaptations of a species. Thus, we present a proposal for an integrative study of the marine landscapes of the Atlantic, Pacific and Indian Oceans, genotyping of SNPs and mitochondrial DNA sequences of S. zygaena hammerhead shark for the characterization of genetic diversity, genus flow patterns, population structure and Phylogeography In a global spatial context. The proposed results will cover important knowledge and will provide subsides to international management and conservation plans. (AU)