title: Being abundant is not enough: a decrease in effective population size over eight generations in a Norwegian population of the seaweed, Fucus serratus.
abstract: The brown alga Fucus serratus is a key foundation species on rocky intertidal shores of northern Europe. We sampled the same population off the coast of southern Norway in 2000 and 2008, and using 26 microsatellite loci, we estimated the changes in genetic diversity and effective population size (Ne). The unexpectedly low Ne (73-386) and Ne/N ratio (10-3-10-4), in combination with a significant decrease (14%) in allelic richness over the 8-year period, suggests an increased local extinction risk. If small Ne proves to be a common feature of F. serratus, then being abundant may not be enough for the species to weather future environmental changes.
authors.affiliation: Department of Marine Benthic Ecology and Evolution, Centre for Ecological and Evolutionary Studies, Biological Centre, University of Groningen, 9750 AA, Haren, The Netherlands. j.a.coyer@rug.nl
authors.forename: James A
authors.initials: JA
authors.lastname: Coyer
authors.forename: Galice
authors.initials: G
authors.lastname: Hoarau
authors.forename: Kjersti
authors.initials: K
authors.lastname: Sjøtun
authors.forename: Jeanine L
authors.initials: JL
authors.lastname: Olsen