Patchy patterns due to group dispersal
نویسندگان
چکیده
منابع مشابه
Competition and dispersal delays in patchy environments.
Dispersal delays are introduced into a competition model for two species that disperse among n identical patches. The model is formulated as a system of integro-differential equations with an arbitrary distribution of dispersal times between patches. By identifying steady states and analyzing local stability, conditions for competitive exclusion, coexistence or extinction are determined in term...
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Although dispersal is often considered to be a plastic, condition-dependent trait with low heritability, growing evidence supports medium to high levels of dispersal heritability. Obtaining unbiased estimates of dispersal heritability in natural populations nevertheless remains crucial to understand the evolution of dispersal strategies and their population consequences. Here we show that dispe...
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To better understand the evolution of dispersal in spatially heterogenous landscapes, we study difference equation models of populations that reproduce and disperse in a landscape consisting of k patches. The connectivity of the patches and costs of dispersal are determined by a k × k column substochastic matrix S where Sij represents the fraction of dispersing individuals from patch j that end...
متن کاملDispersal Timing: Emigration of Insects Living in Patchy Environments
Dispersal is a life-history trait affecting dynamics and persistence of populations; it evolves under various known selective pressures. Theoretical studies on dispersal typically assume 'natal dispersal', where individuals emigrate right after birth. But emigration may also occur during a later moment within a reproductive season ('breeding dispersal'). For example, some female butterflies fir...
متن کاملIncorporating dispersal distance into the disperser effectiveness framework: frugivorous birds provide complementary dispersal to plants in a patchy environment.
Fleshy-fruited plants are usually dispersed by an array of frugivores, differing in the effectiveness of the dispersal service they provide to the plant. Body size differences among frugivores are hypothesized to affect seed dispersal distances and consequently their effectiveness as dispersers. We tested this hypothesis by comparing the effectiveness of two passerine birds, grackles (Onychogna...
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ژورنال
عنوان ژورنال: Journal of Theoretical Biology
سال: 2011
ISSN: 0022-5193
DOI: 10.1016/j.jtbi.2010.11.047