Seasonally limited host supply generates microparasite population cycles.

Abstract:

:Cycles in biological populations have been shown to arise from enemy-victim systems, delayed density dependence, and maternal effects. In an initial effort to model the year-to-year dynamics of natural populations of entomopathogenic nematodes and their insect hosts, we find that a simple, nonlinear, mechanistic model produces large amplitude, period two population cycles. The cycles are generated by seasonal dynamics within semi-isolated populations independently of inter-annual feedback in host population numbers, which differs from previously studied mechanisms. The microparasites compete for a fixed number of host insect larvae. Many nematodes at the beginning of the year quickly eliminate the pool of small hosts, and few nematodes are produced for the subsequent year. Conversely, initially small nematode populations do not over-exploit the host population, so the surviving hosts grow to be large and produce many nematodes that survive to the following year.

journal_name

Bull Math Biol

authors

Dugaw CJ,Hastings A,Preisser EL,Strong DR

doi

10.1016/j.bulm.2003.09.005

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

583-94

issue

3

eissn

0092-8240

issn

1522-9602

pii

S0092824003000971

journal_volume

66

pub_type

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