Dynamics of extinction in coupled populations of the flour beetle Tribolium castaneum

In this study we analyzed the effect of migration on the persistence time of coupled local populations of Tribolium in different environments. Four treatments were set up to compare different levels of environmental heterogeneity. We established high, low, moderate, and no heterogeneity. These level...

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Bibliographic Details
Published in:Brazilian journal of biology 2005-05, Vol.65 (2), p.271-280
Main Authors: Godoy, W A C, Costa, M I S
Format: Article
Language:English
Subjects:
Animals
BIOLOGY
coupled populations
Ecosystem
environmental heterogeneity
Models, Biological
Population Dynamics
Time Factors
Tribolium
Tribolium - physiology
Tribolium castaneum
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Summary:In this study we analyzed the effect of migration on the persistence time of coupled local populations of Tribolium in different environments. Four treatments were set up to compare different levels of environmental heterogeneity. We established high, low, moderate, and no heterogeneity. These levels were estimated by the different amounts of food offered to each population. To investigate how risk spreading works, a stochastic model for two subpopulations was employed. The high heterogeneity treatment resulted in the longest persistence, even though survival analysis revealed no significant difference among treatments. The magnitude of differences in growth rates among subpopulations is probably associated with persistence.
ISSN:1519-6984
1678-4375
1519-6984
DOI:10.1590/s1519-69842005000200010