Relationships between an invasive crab, habitat availability and intertidal community structure at biogeographic scales

Marine Environmental Research
Paul E GribbenJeffrey T Wright

Abstract

At local scales, habitat availability influences interactions between native and invasive species. Habitat availability may also predict patterns in native communities and invasive species at biogeographic scales when both native and invasive species have specific habitat requirements. The New Zealand porcelain crab, Petrolisthes elongatus, has invaded intertidal rocky shores around Tasmania, Australia, where it is found in high densities (>1800 m(2)) under rocks. A hierarchical sampling approach was used to investigate 1) the relationship between habitat availability (rock cover) and the biomass and abundance of P. elongatus, and 2) the relationship between P. elongatus biomass and native communities at local and regional scales. Invertebrate communities and habitat availability were sampled at multiple sites in the north and south regions of Tasmania. P. elongatus biomass and abundance were positively correlated with rock cover and patterns were consistent at the biogeographic scale (between regions). P. elongatus biomass was positively correlated with native species richness, biomass and abundance highlighting their co-dependence on rock cover. However, multivariate analyses indicated a different native community structure w...Continue Reading

References

Nov 24, 1999·Science·J J StachowiczR W Osman
May 10, 2003·Proceedings. Biological Sciences·Jonathan M LevineSandra Lavorel
Feb 6, 2008·Ecology Letters·Thomas J StohlgrenJohn Kartesz

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