β-diversity and species accumulation in antarctic coastal benthos influence of habitat, distance and productivity on ecological connectivityβ-diversity和物种积累在南极海岸底栖生物栖息地的影响,距离和生产力生态连接.pdfVIP

b-Diversity and Species Accumulation in Antarctic Coastal Benthos: Influence of Habitat, Distance and Productivity on Ecological Connectivity 1,2 1 3 4,5 2 Simon F. Thrush *, Judi E. Hewitt , Vonda J. Cummings , Alf Norkko , Mariachiara Chiantore ` 1 National Institute of Water and Atmospheric Research, Hamilton, New Zealand, 2 DipTeRis, Universita di Genova, Genoa, Italy, 3 National Institute of Water and Atmospheric Research, Wellington, New Zealand, 4 Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland, 5 Department of Marine Ecology – ¨ Kristineberg, University of Gothenburg, Fiskebackskil, Sweden Abstract High Antarctic coastal marine environments are comparatively pristine with strong environmental gradients, which make them important places to investigate biodiversity relationships. Defining how different environmental features contribute to shifts in b-diversity is especially important as these shifts reflect both spatio-temporal variations in species richness and the degree of ecological separation between local and regional species pools. We used complementary techniques (species accumulation models, multivariate variance partitioning and generalized linear models) to assess how the roles of productivity, bio-physical habitat heterogeneity and connectivity change with spatial scales from metres to 100’s of km. Our results demonstrated that the relative importance of specific processes influencing species accumulation and b–diversity changed