Loose coupling of predator-prey cycles: entrainment, chaos, and intermittency in the classic MacArthur consumer-resource equations
Article Abstract:
The qualitative behavior of the connected form of consumer-resource equations conforming to MacArthur's proposition is explored. Consumer-resource equations have been drafted such that damping is unavoidable, which is a restriction since the actual systems usually display permanent oscillations. Modern draftings of a single consumer-resource pair have conditions permitting limit cycles, but most are not in the connected form as proposed by MacArthur for the basic consumer-resource system. The phenomenon of entrainment is displayed at low levels of connection between the consumer and its resource, and at higher levels of connection, chaos is displayed.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1993
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Cost-benefit model for the induction of an antipredator defense
Article Abstract:
A model to analyze the costs and benefits of the induction of antipredator defense in the cladoceran Daphnia pulex, which produces offspring with neck spines in response to the predatory insect larva Chaeborus. The life tables of spined and unspined Daphnia were modified to show how prey population growth rate is affected by different predation levels. The critical Chaeborus density which determines spine formation was mainly influenced by food availability and spatial overlap between predator and prey. The main cost of spine induction is to lengthen the development period of Daphnia pulex.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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