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The concept of population in clonal organisms: mosaics of temporally colonized patches are forming highly
 

Summary: The concept of population in clonal organisms: mosaics
of temporally colonized patches are forming highly
diverse meadows of Zostera marina in Brittany
R. BECHELER,* O. DIEKMANN, C. HILY, Y. MOALIC* and S. ARNAUD-HAOND*
*Ifremer, Laboratoire Environnement Profond, Centre de Brest BP70, 29 280 Plouzane´, France, CCMAR, CIMAR-Laborato´rio
Associado, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal, LEMAR, Institut Universitaire Europe´en de
la Mer, Universite´ Occidentale de Bretagne, 29 280 Plouzane´, France
Abstract
Seagrasses structure some of the world's key coastal ecosystems presently in decline due
to human activities and global change. The ability to cope with environmental changes
and the possibilities for shifts in distribution range depend largely on their evolvability
and dispersal potential. As large-scale data usually show strong genetic structure for
seagrasses, finer-grained work is needed to understand the local processes of dispersal,
recruitment and colonization that could explain the apparent lack of exchange across
large distances. We aimed to assess the fine-grained genetic structure of one of the most
important and widely distributed seagrasses, Zostera marina, from seven meadows in
Brittany, France. Both classic population genetics and network analysis confirmed a
pattern of spatial segregation of polymorphism at both regional and local scales. One
location exhibiting exclusively the variety `angustifolia' did not appear more differen-
tiated than the others, but instead showed a central position in the network analysis,

  

Source: Alberto, Filipe - Centro de Ciencias do Mar, Universidade do Algarve

 

Collections: Environmental Sciences and Ecology; Biology and Medicine