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Time scale of resource dynamics and coexistence through time partitioning

par Loreau, Michel
Référence Theoretical population biology, 41, 3, page (401-412)
Publication Publié, 1992-06

Article révisé par les pairs

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Résumé :

The difference between the time scales of consumer and resource dynamics is a critical factor for the coexistence of consumers that occupy different temporal niches in a seasonal environment. Its significance is investigated using a general discrete cyclic model involving two consumers competing for the exploitation of one resource. Simulations confirm and extend previous analytical results. Temporal overlap and difference between consumer efficiencies play roles that are in general qualitatively similar to those of niche overlap and difference between carrying capacities in the classical theory of competition in a constant environment. But the relative time scale of resource dynamics plays a crucial role which does not have an analogue in the classical theory: coexistence at the consumer level is possible only above threshold values of both frequency and speed of dynamics at the resource level. © 1992.