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Genetic structure of eelgrass Zostera marina meadows in an embayment with restricted water flow

2006; Inter-Research; Volume: 309; Linguagem: Inglês

10.3354/meps309107

1616-1599

Raquel Muñiz‐Salazar, SL Talbot, G. Kevin Sage, DH Ward, Alejandro Cabello‐Pasini,

Marine Biology and Ecology Research

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 309:107-116 (2006) - doi:10.3354/meps309107 Genetic structure of eelgrass Zostera marina meadows in an embayment with restricted water flow Raquel Muñiz-Salazar1,*, Sandra L. Talbot2, George K. Sage2, David H. Ward2, Alejandro Cabello-Pasini1 1Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California AP 453, Ensenada, Baja California 22800, Mexico 2Alaska Science Center, US Geological Survey, 1011 E. Tudor Road, Anchorage, Alaska 99503, USA *Email: ramusal@uabc.mx ABSTRACT: Genetic structure of the seagrass Zostera marina in a coastal lagoon with restricted water flow, and with heterogeneous water residence times and oceanographic characteristics, was assessed using 8 polymorphic microsatellite loci. Analyses of genetic differentiation (θ) and Bayesian clustering suggested that the Z. marina population in San Quintin Bay (SQB) is genetically substructured, with at least 4 genetically different groups: (1) West Head, (2) Mouth, (3) East Arm, and (4) East Head. The greatest θ value was observed between the most distant sites (θ = 0.095). The lowest values were found among sites closest to the mouth of the coastal lagoon (θ = 0.000 to 0.009). The maximum likelihood approach showed that the sites at the mouth have a mixed pattern of gene flow without a unidirectional pattern. In contrast, there was a clear pattern of asymmetrical gene flow from the mouth towards the West Head. These results suggested that the restriction of water flow at the heads, current pattern, and the distance between sites can reduce genetic flow and promote genetic differences within Z. marina meadows in small water embayments such as SQB. Though the population is genetically substructured and a 14% decline in cover has been detected, this study did not show evidence of a recent genetic bottleneck. In contrast, mouth sites have experienced a recent expansion in their population size, and also perhaps a recent influx of rare alleles from genetically distinct immigrants. KEY WORDS: Small structure · Microsatellites · Zostera marina · San Quintin Bay · Bottleneck · Barriers Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 309. Online publication date: March 15, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research.