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Emergent properties in island species community assembly: relating species abundance distributions (SADs) with oceanic islands biogeographical variables.

AuthorsBorges, Paulo A.V.; Matthews, Thomas; Borda-d'Agua, Luis; Cardoso, Pedro; Rigal, François; Triantis, Kostas A.; Whittaker, Robert J.; Borregard, Michael; Fattorini, Simone; Hortal, Joaquín CSIC ORCID ; Santos, Ana Margarida C.; Lobo, Jorge M. CSIC ORCID ; Rego, C.; Elias, Rui B.; Oromí, Pedro; Fernández-Palacios, José María; Caujapé Castells, J. CSIC ORCID; Thébaud, Christophe; Strasberg, Dominique; Emerson, Brent C. CSIC ORCID
Issue Date7-Jul-2014
CitationIsland Biology 2014
AbstractIsland biogeographical and ecological theories are dominated by patterns and processes related with species diversity and in particular species richness. Although we now have some understanding of the processes involved in species diversification and on the factors determining the number of species on islands, we still lack a theory that relates island geographical variables with species abundance and community assembly at both local and regional scales in insular systems. The observation that ecological systems contain a small number of very abundant species and numerous relatively rare species is often described as one of only a few universal ecological laws. In this contribution we use standardized arthropod and vascular plant datasets from the Azores, Madeira, Canary Islands and La Reunion to investigate the impact island characteristics in species abundance distributions (SADs). We found that in Azores a large number of communities are bimodal, comprising very rare species (i.e. with low abundances) and relatively common species. Satellite taxa, introduced species and species that are more adapted to anthropogenic land surrounding the native forest tend to be found in lower abundances. More generally for all the archipelagos, we also found that SADs change as a function of species rarity and island age. In this respect, island identity is more important than trophic group in the properties of SADs. The consistent observed differences in the shape and parameters of island SAD models demonstrate that the study of relative species abundances is potentially useful in island biogeography.
DescriptionTrabajo presentado en el el congreso Island Biology 2014 celebrado en Hawai del 7 al 11 de julio de 2014.
Appears in Collections:(IPNA) Comunicaciones congresos
(MNCN) Comunicaciones congresos

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