Brown, Christopher G
Dunham, Amy E
Bagdassarian, Carey K
Although the food web is one of the most fundamental and oldest concepts in ecology, elucidating the strategies and structures by
which natural communities of species persist remains a challenge to empirical and theoretical ecologists. We show that simple regulatory
feedbacks between autotrophs and their environment when embedded within complex and realistic food-web models enhance
biodiversity. The food webs are generated through the niche-model algorithm and coupled with predator–prey dynamics, with and
without environmental feedbacks at the autotroph level. With high probability and especially at lower, more realistic connectance levels,
regulatory environmental feedbacks result in fewer species extinctions, that is, in increased species persistence. These same feedback
couplings, however, also sensitize food webs to environmental stresses leading to abrupt collapses in biodiversity with increased forcing.
Feedback interactions between species and their material environments anchor food-web persistence, adding another dimension to
biodiversity conservation. We suggest that the regulatory features of two natural systems, deep-sea tubeworms with their microbial
consortia and a soil ecosystem manifesting adaptive homeostatic changes, can be embedded within niche-model food-web dynamics.
r 2007 Elsevier Ltd. All rights reserved.
The Jeffress Memorial Trust, The College of William and
Mary, Harvard University, and the Howard Hughes
Biodiversity maintenance in food webs with regulatory environmental feedbacks
Rauscher, Daniel, Brown, Christopher G, Dunham, Amy E, et al.. "Biodiversity maintenance in food webs with regulatory environmental feedbacks." (2007) Elsevier: https://hdl.handle.net/1911/21691.