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Marine Biology

, 165:9 | Cite as

Comparative population genetic study of an important marine parasite from New Zealand flat oysters

Original paper

Abstract

The comparative genetic structure of hosts and parasites can reveal constraints acting on parasite dispersal among host populations and the evolution of local adaptation. We sampled New Zealand flat oysters Ostrea chilensis from 12 sites throughout New Zealand to (1) determine the distribution and prevalence of the haplosporidian parasites Bonamia exitiosa and B. ostreae, and (2) test for congruent patterns of host and parasite genetic structure. B. exitiosa was detected at three sites: Hauraki Gulf (5% prevalence), Marlborough Sounds (30%), and Foveaux Strait (7%), whereas B. ostreae was only detected in the Marlborough Sounds (37%). Using nuclear internal transcribed spacer (ITS) rDNA sequences of B. exitiosa, as well as mitochondrial cytochrome c oxidase subunit 1 gene (CO1) sequences of O. chilensis from the same sites plus other key O. chilensis growing areas (Tasman Bay and Chatham Islands), we compared the genetic structure of host and parasite. B. exitiosa displayed genetic structure across all three sites which were reflected in populations of O. chilensis except for gene flow between Tasman Bay-Marlborough Sounds-Chatham Islands. The observed patterns reflect the host specificity of Bonamia parasites and the limited dispersal capability of oysters. O. chilensis may experience long distance dispersal which is likely influenced by oceanographic factors. Nonetheless, a failure to detect Bonamia parasites among genetically connected O. chilensis populations suggests natural long distance co-dispersal of Bonamia parasites with O. chilensis is unlikely. Instead, the dispersal of Bonamia parasites is likely influenced by anthropogenic factors.

Notes

Acknowledgements

We thank New Zealand’s Ministry for Primary Industries (MPI), NIWA, and Kono Seafoods for the efforts in sample collection. The Animal Health Laboratory, Wallaceville, (MPI) provided laboratory resources during the course of this study which was carried out as part of a Ph.D. project at the University of Otago, within Prof. Robert Poulin’s laboratory group. Finally, we thank the anonymous reviewers, whose input greatly improved this manuscript.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflicts of interests.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of OtagoDunedinNew Zealand
  2. 2.Ministry for Primary Industries, Animal Health LaboratoryInvestigation and Diagnostic CentreUpper HuttNew Zealand

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