Earth to Ocean Research Group, Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6.
Hakai Institute, PO Box 309, Heriot Bay, British Columbia, Canada V0P 1H0.
Proc Biol Sci. 2020 Mar 11;287(1922):20200108. doi: 10.1098/rspb.2020.0108.
The classical , which predicts species richness using island area and isolation, has been expanded to include contributions from marine subsidies, i.e. (SIB) . 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 km) 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 δN. 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 determining species richness and densities of terrestrial biota.
经典模型，使用岛屿面积和隔离度来预测物种丰富度，已经扩展到包括海洋补贴的贡献，即（SIB）。我们测试了海洋补贴对生产力温带岛屿上物种多样性和种群密度的影响，评估了以前在可比规模和补贴水平下未经测试的 SIB 预测。我们发现，加拿大不列颠哥伦比亚省中部海岸 91 个小岛屿（约 0.0001-3 公里）上的陆地繁殖鸟类群落的多样性与岛屿面积最密切相关，但也与海洋补贴有关。物种丰富度随岛屿面积增加而增加，种群密度随岛屿面积增加而减少，但隔离度没有可测量的影响。物种丰富度与海洋补贴呈负相关，海洋补贴以森林边缘土壤 δN 表示。然而，在海洋补贴较高的岛屿上，密度更高，面积和补贴之间的负相互作用表明，这种效应在较小的岛屿上更强，这为 SIB 提供了一些支持。我们的研究强调了海洋补贴如何塑造岛屿上的多样性模式，甚至可以超过隔离度对确定陆地生物多样性和密度的重要性。
