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• W2112897816 abstract "Availability of food may play a number of different dynamical roles in rodent–vegetation systems. Consideration of a suite of rodent–vegetation models, ranging from very simple ones to a model of medium complexity tailored to a specific system (brown lemmings at Point Barrow, Alaska, USA), suggested several general principles. If vegetation grows logistically following an herbivory event (a standard assumption of previously advanced models for herbivore–plant interactions), then almost any biologically reasonable combinations of parameters characterizing rodent–vegetation systems would result in population cycles. We argue, however, that the assumption of logistic growth of the food supply may be appropriate for only a few species, such as moss-eating lemmings. The dynamics of food supply for many arvicoline (microtine) rodents may be better described by a “linear initial regrowth” model, which exhibits globally stable dynamics. If this is so, quantitative interactions with food supply are unlikely to explain multiannual population cycles for most boreal or temperate voles. The role of food in population dynamics, however, is not limited to its potential to generate cycles. A tritrophic model including vegetation, rodents, and their specialist predators suggests that food limitation may provide direct density dependence needed for sustained oscillations in this system (which is usually modeled by a phenomenological logistic term in the prey equation). We relate the general theory that we developed to one specific system where we have enough data to arrive at reasonable estimates for most of the parameters—brown lemmings at Point Barrow. The Barrow model exhibits oscillations of the approximately correct period and amplitude, thus giving some theoretical support to the food hypothesis. Nevertheless, we suggest that this result should be treated cautiously because key events explaining the population cycle in the model occur during winter, but winter biology of lemmings is still poorly understood." @default.
• W2112897816 created "2016-06-24" @default.
• W2112897816 creator A5043788108 @default.
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• W2112897816 date "2001-06-01" @default.
• W2112897816 modified "2023-09-25" @default.
• W2112897816 title "AVAILABILITY OF FOOD AND THE POPULATION DYNAMICS OF ARVICOLINE RODENTS" @default.
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• W2112897816 doi "https://doi.org/10.1890/0012-9658(2001)082[1521:aofatp]2.0.co;2" @default.
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