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Summary: vol. 157, no. 6 the american naturalist june 2001
Effects of Enrichment on Simple Aquatic Food Webs
Anders Persson,* Lars-Anders Hansson,
Christer Brošnmark,
Per Lundberg,§
Lars B. Pettersson,k
Larry Greenberg,#
P. Anders Nilsson,** Per Nystrošm,
Pia Romare,
and Lars Tranvik§§
Department of Ecology, Lund University, Ecology Building, S-223
62 Lund, Sweden
Submitted March 24, 2000; Accepted January 19, 2001
abstract: Simple models, based on Lotka-Volterra types of inter-
actions between predator and prey, predict that enrichment will have
a destabilizing effect on populations and that equilibrium population
densities will change at the top trophic level and every second level
below. We experimentally tested these predictions in three aquatic
food web configurations subjected to either high or low nutrient
additions. The results were structured by viewing the systems as either
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