Single-species models for many-species food webs.

Abstract:

:Most species live in species-rich food webs; yet, for a century, most mathematical models for population dynamics have included only one or two species. We ask whether such models are relevant to the real world. Two-species population models of an interacting consumer and resource collapse to one-species dynamics when recruitment to the resource population is unrelated to resource abundance, thereby weakening the coupling between consumer and resource. We predict that, in nature, generalist consumers that feed on many species should similarly show one-species dynamics. We test this prediction using cyclic populations, in which it is easier to infer underlying mechanisms, and which are widespread in nature. Here we show that one-species cycles can be distinguished from consumer resource cycles by their periods. We then analyse a large number of time series from cyclic populations in nature and show that almost all cycling, generalist consumers examined have periods that are consistent with one-species dynamics. Thus generalist consumers indeed behave as if they were one-species populations, and a one-species model is a valid representation for generalist population dynamics in many-species food webs.

journal_name

Nature

journal_title

Nature

authors

Murdoch WW,Kendall BE,Nisbet RM,Briggs CJ,McCauley E,Bolser R

doi

10.1038/417541a

keywords:

subject

Has Abstract

pub_date

2002-05-30 00:00:00

pages

541-3

issue

6888

eissn

0028-0836

issn

1476-4687

pii

417541a

journal_volume

417

pub_type

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