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Importance of endogenous feedback controlling the long-term abundance of tropical mosquito species

Yang, Guo-Jing, Bradshaw, Corey J. A., Whelan, Peter I. and Brook, Barry William (2008). Importance of endogenous feedback controlling the long-term abundance of tropical mosquito species. Population Ecology,50(3):293-305.

Document type: Journal Article
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IRMA ID A00003xPUB40
Title Importance of endogenous feedback controlling the long-term abundance of tropical mosquito species
Author Yang, Guo-Jing
Bradshaw, Corey J. A.
Whelan, Peter I.
Brook, Barry William
Journal Name Population Ecology
Publication Date 2008
Volume Number 50
Issue Number 3
ISSN 1438-3896   (check CDU catalogue open catalogue search in new window)
Start Page 293
End Page 305
Total Pages 13
Place of Publication Japan
Publisher Springer Japan
Field of Research 0602 - Ecology
HERDC Category C1 - Journal Article (DEST)
Abstract Mosquitoes are a major vector for tropical diseases, so understanding aspects that modify their population dynamics is vital for their control and protecting human health. Maximising the efficiency of control strategies for reducing transmission risk requires as a first step the understanding of the intrinsic population dynamics of vectors. We fitted a set of density-dependent and density-independent models to the long-term time series of six tropical mosquito species from northern Australia. The models’ strength of evidence was assessed using Akaike’s Information Criterion (AIC c ), Bayesian Information Criterion (BIC) and jack-knifed cross-validation (C-V). Density dependence accounted for more than 99% of the model weight in all model-selection methods, with the Gompertz-logistic (Cushing model) being the best-supported model for all mosquito species (negative density feedback expressed even at low densities). The second-most abundant species, Aedes vigilax (a saline breeder), showed no spatial heterogeneity in its density-dependent response, but the remaining five species had different intrinsic growth rates across 11 study sites. Population densities of saline species were high only during the late dry to early wet season following the highest tides of the month or early flood rains when swamps were mostly saline, whereas those of freshwater species were highest during the mid-wet and mid-dry seasons. These findings demonstrate remarkably strong density dependence in mosquito populations, but also suggest that environmental drivers, such as rainfall and tides, are important in modifying seasonal densities. Neglecting to account for strong density feedback in tropical mosquito populations will clearly result in less effective control.
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Created: Fri, 01 May 2009, 11:54:13 CST by Sarena Wegener