Abstract:
:Ecosystems are differentially open to subsidies of energy, material and organisms. This fundamental ecosystem attribute has long been recognized but the influence of this property on community regulation has not been investigated. We propose that this environmental attribute may explain variation in the strength of trophic cascades among ecosystems. Simply because of gravity, we should predict that systems with convex profiles receive low amounts of subsidies whereas systems with concave profiles act as spatial attractors, and receive high amounts of subsidies. The subsidy hypothesis states that ecosystems with high amounts of allochthonous inputs will experience the strongest trophic cascades. To test this hypothesis, we derive ecosystem models and investigate the effect of location and magnitude of subsidies on the strength of trophic cascades. Predictions from our models support the subsidy hypothesis and highlight the need to consider ecosystems as open to allochthonous flows.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Leroux SJ,Loreau Mdoi
10.1111/j.1461-0248.2008.01235.xsubject
Has Abstractpub_date
2008-11-01 00:00:00pages
1147-1156issue
11eissn
1461-023Xissn
1461-0248journal_volume
11pub_type
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