The source-sink dynamics is a major hypothesis to explain
dispersal-mediated coexistence of locally exclusive competitors.
We study Lotka--Volterra diffusive models of indirect competition in
patchy metacommunities.
In a model of exploitative competition, we numerically show that the
effect of resource movement on the coexistence depends on demographic
factors that create source-sink
structures and that the dispersal rate of the superior competitor need
not be higher than that of the inferior to promote dispersal-mediated
coexistence. In a model of apparent competition, we analytically prove
that dispersal can make coexistence possible even if any patches are
sinks for the inferior resource species. The requirement for this
coexistence is the lower
dispersal rate of the inferior competitor. We conclude that dispersal
among patches can be a mechanism to save inferior indirect competitors
from regional extinction and that the level of spatial heterogeneity
need not be so high to reverse the competitive rankings among patches.
@article{1197390052,
author = {Namba, Toshiyuki},
title = {Dispersal-Mediated Coexistence of Indirect Competitors in Source-Sink Metacommunities},
journal = {Japan J. Indust. Appl. Math.},
volume = {24},
number = {1},
year = {2007},
pages = { 39-55},
language = {en},
url = {http://dml.mathdoc.fr/item/1197390052}
}
Namba, Toshiyuki. Dispersal-Mediated Coexistence of Indirect Competitors in Source-Sink Metacommunities. Japan J. Indust. Appl. Math., Tome 24 (2007) no. 1, pp. 39-55. http://gdmltest.u-ga.fr/item/1197390052/