A puzzle with many pieces: the genetic structure and diversity of Phaeocystis antarctica Karsten (Prymnesiophyta)

Gaebler-Schwarz, S; Medlin, LK; Leese, F. 2015 A puzzle with many pieces: the genetic structure and diversity of Phaeocystis antarctica Karsten (Prymnesiophyta). European Journal of Phycology, 50. 112-124. 10.1080/09670262.2014.998295

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Official URL: http://dx.doi.org/10.1080/09670262.2014.998295

Abstract/Summary

Strong ocean current systems characterize the Southern Ocean. The genetic structure of marine phytoplankton species is believed to depend mainly on currents. Genetic estimates of the relatedness of populations of phytoplankton species therefore should provide a proxy showing to what extent different geographic regions are interconnected by the ocean current systems. In this study, spatial and temporal patterns of genetic diversity were studied in the circumpolar prymnesiophyte Phaeocystis antarctica Karsten using seven nuclear microsatellite loci. Analyses were conducted for 86 P. antarctica isolates sampled around the Antarctic continent between 1982 and2007. The resultsrevealed highgenetic diversity without singlegenotypes recurringeven amongisolateswithin a bloom or originating from the same bucket of water. Populations of P. antarctica were significantly differentiated among the oceanic regions. However, some geographically distant populations were more closely related to each other than they were to other geographically close populations. Temporal haplotype turnover within regions was also suggested by the multilocus fingerprints. Our data suggest that even within blooms of P. antarctica genetic diversity and population sizes are large but exchange between different regions canbe limited. Positive and significant inbreeding coefficients hint at further regional substructure of populations, suggestingthat patches, once isolated from one another, may not reconnect. These data emphasize that even for planktonic species in a marine ecosystem that is influenced by strong currents, significant breaks in geneflow may occur.

Item Type: Publication - Article
Additional Keywords: biogeography, current patterns, dispersal, genetic diversity, Phaeocystis , population genetics, Southern Ocean
Subjects: Biology
Divisions: Marine Biological Association of the UK > Ecosystems and Environmental Change > Behaviour and effects of contaminants
Depositing User: Mrs Maggie Thomas
Date made live: 23 Nov 2015 16:30
Last Modified: 06 Jun 2017 16:14
URI: http://plymsea.ac.uk/id/eprint/6619

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