Bioinvasion threatens the genetic integrity of native diversity and a natural hybrid zone: Smooth-shelled blue mussels (Mytilus spp.) in the Strait of Magellan

Pablo A. Oyarzún, Jorge E. Toro, Juan I. Cañete, Jonathan P.A. Gardner

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Smooth-shelled blue mussels of the Mytilus edulis species complex are widely distributed bivalve molluscs whose introductions threaten native marine biodiversity (non-indigenous species - NIS). The aim of the present study was to identify the species and hybrids of Mytilus present in the Magellan Region (southern Chile). Results indicate that three mussel species of the Mytilus edulis complex are found in the region - M. edulis, M. chilensis (or the Southern Hemisphere lineage of Mytilus galloprovincialis), and M. galloprovincialis of Northern Hemisphere origin. For the first time, alleles of the introduced M. trossulus are reported from the Southern Hemisphere. In the Strait of Magellan the native Pacific blue mussel, Mytilus chilensis and the native Atlantic blue mussel, Mytilus edulis, meet and mix at a natural hybrid zone (about 125 km in length). This is the first record of a natural Mytilus hybrid zone in the Southern Hemisphere and is also the first record of the co-occurrence of genes from all four Mytilus species in any one region. These results contribute to the knowledge of the biodiversity and delimitation of mussel species in southern South America, and highlight how introduced species may threaten the genetic integrity of native species through hybridization and introgression.

Original languageEnglish
Pages (from-to)574-585
Number of pages12
JournalBiological Journal of the Linnean Society
Volume117
Issue number3
DOIs
Publication statusPublished - 1 Mar 2016

Keywords

  • Hybridization
  • Mitochondrial and nuclear DNA markers
  • Mytilus edulis species complex
  • South America

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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