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Population genetic structure of the threatened tropical seagrass Enhalus acoroides in Hainan Island, China

journal contribution
posted on 2018-11-01, 00:00 authored by S Yu, S Liu, K Jiang, J Zhang, Z Jiang, Y Wu, C Huang, C Zhao, X Huang, Stacey Trevathan-TackettStacey Trevathan-Tackett
Knowledge of the genetic structure of ecologically important species provides insight into population dynamics and persistence, which is important for decisions concerning ecosystem conservation and management. Seagrass ecosystems are being degraded in China due to coastal anthropogenic disturbances like eutrophication and pollution, but their genetic ecology is still poorly understood. In this study, we collected Enhalus acoroides samples from three lagoons and five offshore open-water sites along the east coast of Hainan Island to investigate its genetic diversity and structure using ten microsatellite loci. A total of 66 alleles were found, and the genetic diversity indices (i.e. mean number of alleles per locus, allelic richness and heterozygosity) varied among the eight populations. Assignment tests showed that the E. acoroides populations consists of three genetic clusters. Impeded gene flow among lagoonal populations was found, while connectivity existed among the open-water populations. This pattern seemed to be shaped by geographic isolation and ocean currents. Based on the genetic contribution analysis, we recommended that the E. acoroides populations at Tielugang and Gangdong need protection priority given they contribute higher genetic diversity, but are currently high risk populations under threats of pollution and physical disturbance.

History

Journal

Aquatic botany

Volume

150

Pagination

64-70

Location

Amsterdam, The Netherlands

ISSN

0304-3770

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier B.V.

Publisher

Elsevier