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Coexistence under positive frequency dependence Jane Molofsky1*

Summary: Coexistence under positive frequency dependence
Jane Molofsky1*
, James D. Bever2
and Janis Antonovics3
Department of Botany, University of Vermont, Burlington,VT 05405, USA
Department of Biology, Indiana University, Bloomington, IN 47405, USA
3Department of Biology, University of Virginia, Charlottesville,VA 22903-2477, USA
Negative frequency dependence resulting from interspeciąc interactions is considered a driving force in
allowing the coexistence of competitors. While interactions between species and genotypes can also result
in positive frequency dependence, positive frequency dependence has usually been credited with hastening
the extinction of rare types and is not thought to contribute to coexistence. In the present paper, we
develop a stochastic cellular automata model that allows us to vary the scale of frequency dependence and
the scale of dispersal. The results of this model indicate that positive frequency dependence will allow the
coexistence of two species at a greater rate than would be expected from chance. This coexistence arises
from the generation of banding patterns that will be stable over long time-periods. As a result, we found
that positive frequency-dependent interactions over local spatial scales promote coexistence over neutral
interactions. This result was robust to variation in boundary conditions within the simulation and to
variation in levels of disturbance. Under all conditions, coexistence is enhanced as the strength of positive


Source: Antonovics, Janis - Department of Biology, University of Virginia


Collections: Biology and Medicine