Sequentially assembled food webs and extremum principles in ecosystem ecology

The Journal of Animal Ecology
Nathaniel VirgoMark Emmerson

Abstract

1. Successional changes during sequential assembly of food webs were examined. This was carried out by numerical methods, drawing one species at a time from a species pool and obtaining the permanent (persistent) community emerging at each step. Interactions among species were based on some simple rules about body sizes of consumers and their prey, and community dynamics were described in terms of flows of biomass density. 2. Sequential assembly acted as a sieve on the communities, assembled communities having many properties different on average from those of feasible, stable communities taken at random from the species pools. 3. Time-series of community development were consistent with certain functions thought to go to an extremum (maximum or minimum) in ecosystem ecology, including a rapid early increase in net primary productivity and ascendency, although a clear trend in total biomass density was not evident and resilience decreased rather than increased. 4. In addition, more gradual changes in food web structure took place during succession to which the ecosystem goal functions were relatively insensitive. These changes included gradual increases in the number of species, invasion resistance, number of loops of length > ...Continue Reading

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Citations

May 20, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jennifer A Dunne, Richard J Williams
Jan 17, 2008·The American Naturalist·Nadiah P Kristensen
Dec 15, 2010·Journal of Theoretical Biology·Martin HartvigJan E Beyer
Apr 10, 2007·Journal of Theoretical Biology·Hannah M Lewis, Richard Law
Nov 3, 2010·Journal of Theoretical Biology·José A CapitánJordi Bascompte
Jan 30, 2018·Ecology Letters·Daniel S MaynardStefano Allesina
Nov 19, 2020·Ecology Letters·Hsi-Cheng HoSamraat Pawar

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