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Marine Ecology Progress Series

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MEPS 508:129-138 (2014)  -  DOI:

Additive and site-specific effects of two foundation species on invertebrate community structure

A. Randall Hughes1,*, Paul E. Gribben2,4, David L. Kimbro1, Melanie J. Bishop3

1Northeastern University Marine Science Center, 430 Nahant Rd., Nahant, MA 01908, USA
2Plant Functional Biology and Climate Change Cluster, School of the Environment, University of Technology, Sydney, NSW 2007, Australia
3Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia
4Present address: Institute of Natural and Mathematical Sciences, Massey University, Auckland 0745, New Zealand
*Corresponding author:

ABSTRACT: Many aquatic and terrestrial ecosystems are comprised of assemblages of multiple foundation species. Despite the common occurrence of multiple foundation species, relatively few studies have examined the independent and combined effects of multiple co-occurring foundation species or investigated whether they facilitate similar or distinct associated communities. At 2 sites in a temperate Australian mangrove forest, we examined the independent and interactive effects of co-occurring intermediate foundation species (the macroalga Hormosira banksii and the oyster Saccostrea glomerata—each of which is facilitated by mangrove pneumatophores) on associated community structure. Because the identity of the associated species facilitated by these 2 foundation species can differ, we hypothesized that their combined effects on species richness would be independent and additive. We found that despite their mutual facilitation by mangrove pneumatophores, the 2 intermediate foundation species exhibited independent and positive effects on associated species abundance, richness, and composition. Associated species abundance and richness increased consistently with S. glomerata biomass. In contrast, associated species abundance and richness only responded to H. banksii presence (not biomass), and this response differed across sites. Our finding that functionally different species produce additive effects on biodiversity is consistent with predictions from other recent studies of facilitation cascades. Furthermore, the site-specific effects of foundation species in this study add to growing evidence that while foundation species can set the potential abundance and richness of associated communities, realized community structure is determined by processes operating at larger spatial and temporal scales.

KEY WORDS: Algae · Context dependency · Facilitation cascade · Foundation species · Mangrove · Oyster

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Cite this article as: Hughes AR, Gribben PE, Kimbro DL, Bishop MJ (2014) Additive and site-specific effects of two foundation species on invertebrate community structure. Mar Ecol Prog Ser 508:129-138.

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