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Proceedings Paper

Habitat size and extinction in population dynamics
Author(s): Carlos Escudero; Javier Buceta; Francisco Javier de la Rubia; Katja Lindenberg
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Paper Abstract

We review the critical patch size problem, already classic in the mathematical biology literature. We consider a logistic population living in a finite patch of length L and undergoing random dispersal. The patch presents good conditions for life, while the conditions are so harsh outside that they lead to certain extinction. The usual mean field approach leads to a critical patch size Lc, such that if the actual length of the patch is smaller than Lc the population becomes extinct with certainty, whereas a longer patch leads to certain survival. We study the fluctuations in the population due to its low density near extinction and analyze their effects on the probability of extinction. We find that there is no patch size that can be considered absolutely safe for the population and that, under certain circumstances, the population is under risk of extinction for any patch size.

Paper Details

Date Published: 25 May 2004
PDF: 11 pages
Proc. SPIE 5467, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems II, (25 May 2004); doi: 10.1117/12.537570
Show Author Affiliations
Carlos Escudero, Univ. Nacional de Educacion a Distancia (Spain)
Javier Buceta, Univ. Nacional de Educacion a Distancia (Spain)
Univ. of California/San Diego (United States)
Francisco Javier de la Rubia, Univ. Nacional de Educacion a Distancia (Spain)
Katja Lindenberg, Univ. of California/San Diego (United States)


Published in SPIE Proceedings Vol. 5467:
Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems II
Derek Abbott; Sergey M. Bezrukov; Andras Der; Angel Sanchez, Editor(s)

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