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Sources of beta diversity in estuarine benthic macro-invertebrate communities in the Baltic Sea - North Sea transition

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Identification of sources of beta diversity, the change of diversity, is important to
understand regulation of overall diversity.
Additive partitioning of diversity (species richness and expH) compared to
random, was performed on a quantitative benthic macro-invertebrate collection
of > 400 species from an area extending > 400 km. The 330 samples were
arranged hierarchically into four levels representing different spatial scales: 1)
the sample scale (0.1 m2) nested within 2) Stations (m scale) nested within 3)
sediment type strata (km scale), nested within 4) regions with different salinity
regimes (ca 100 km).
Contributions of beta to total diversity were high among regions, but minor
between sediment types. Thus controlling for the two environmental factors,
salinity and sediment type, there was still an unexplained high beta among
stations within regions.
A significant distance-decay within regions of similarity between stations likely
contributed to this high beta. Decay curves with shorter halving distances for
species with direct benthic development compared to those with planktotrophic
larval development, suggested that dispersal limitation generated some of the
high beta within regions. The study indicates control of beta diversity by both
environmental factors and factors related to invertebrate biology, operating at
different spatial scales.
StatusUdgivet - 2011
BegivenhedWorld Conference on Marine Biodiversity 2011 - Aberdeen, Scotland, Storbritannien
Varighed: 26 sep. 201130 sep. 2011


KonferenceWorld Conference on Marine Biodiversity 2011
ByAberdeen, Scotland

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