Effects of demographic stochasticity on biological community assembly on evolutionary time scales
KAUST Grant NumberKUK-I1-005-04
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AbstractWe study the effects of demographic stochasticity on the long-term dynamics of biological coevolution models of community assembly. The noise is induced in order to check the validity of deterministic population dynamics. While mutualistic communities show little dependence on the stochastic population fluctuations, predator-prey models show strong dependence on the stochasticity, indicating the relevance of the finiteness of the populations. For a predator-prey model, the noise causes drastic decreases in diversity and total population size. The communities that emerge under influence of the noise consist of species strongly coupled with each other and have stronger linear stability around the fixed-point populations than the corresponding noiseless model. The dynamics on evolutionary time scales for the predator-prey model are also altered by the noise. Approximate 1/f fluctuations are observed with noise, while 1/ f2 fluctuations are found for the model without demographic noise. © 2010 The American Physical Society.
CitationMurase Y, Shimada T, Ito N, Rikvold PA (2010) Effects of demographic stochasticity on biological community assembly on evolutionary time scales. Phys Rev E 81. Available: http://dx.doi.org/10.1103/PhysRevE.81.041908.
SponsorsThis work was partly supported by 21st Century COE Program "Applied Physics on Strong Correlation" from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, the JSPS (Grant No. 19340110), and GRP of KAUST (Grant No. KUK-I1-005-04). Y. M. appreciates hospitality at Florida State University, where work was supported by U.S. NSF Grants No. DMR-0444051 and No. DMR-0802288.
PublisherAmerican Physical Society (APS)
JournalPhysical Review E
CollectionsPublications Acknowledging KAUST Support
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