Marine subsidies mediate patterns in avian island biogeography

Proceedings. Biological Sciences
Debora S ObristJohn D Reynolds

Abstract

The classical theory of island biogeography, which predicts species richness using island area and isolation, has been expanded to include contributions from marine subsidies, i.e. subsidized island biogeography (SIB) theory. We tested the effects of marine subsidies on species diversity and population density on productive temperate islands, evaluating SIB predictions previously untested at comparable scales and subsidy levels. We found that the diversity of terrestrial breeding bird communities on 91 small islands (approx. 0.0001-3 km2) along the Central Coast of British Columbia, Canada were correlated most strongly with island area, but also with marine subsidies. Species richness increased and population density decreased with island area, but isolation had no measurable influence. Species richness was negatively correlated with marine subsidy, measured as forest-edge soil δ15N. Density, however, was higher on islands with higher marine subsidy, and a negative interaction between area and subsidy indicates that this effect is stronger on smaller islands, offering some support for SIB. Our study emphasizes how subsidies from the sea can shape diversity patterns on islands and can even exceed the importance of isolation in d...Continue Reading

References

Jan 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·J M Diamond, E Mayr
Jun 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·J M DiamondE Mayr
Nov 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·M E Gilpin, J M Diamond
May 28, 2010·Ecology·David A SpillerTomoya Iwata
Feb 18, 2011·Proceedings. Biological Sciences·Rachel D Field, John D Reynolds
Mar 29, 2011·Science·Morgan D Hocking, John D Reynolds
Feb 7, 2019·PloS One·Marlene A Wagner, John D Reynolds

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