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Tropical mosquito assemblages demonstrate 'textbook' annual cycles.

Franklin, Donald C. and Whelan, Peter I. (2009). Tropical mosquito assemblages demonstrate 'textbook' annual cycles.. PLoS ONE,4(12):e8296.

Document type: Journal Article
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IRMA ID 73283902xPUB52
Title Tropical mosquito assemblages demonstrate 'textbook' annual cycles.
Author Franklin, Donald C.
Whelan, Peter I.
Journal Name PLoS ONE
Publication Date 2009
Volume Number 4
Issue Number 12
ISSN 1932-6203   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-77949504147
Start Page e8296
Total Pages 5
Place of Publication United States
Publisher Public Library of Science
HERDC Category C1 - Journal Article (DEST)
Abstract Background
Annual biological rhythms are often depicted as predictably cyclic, but quantitative evaluations are few and rarely both cyclic and constant among years. In the monsoon tropics, the intense seasonality of rainfall frequently drives fluctuations in the populations of short-lived aquatic organisms. However, it is unclear how predictably assemblage composition will fluctuate because the intensity, onset and cessation of the wet season varies greatly among years.

Methodology/Principal Findings
Adult mosquitoes were sampled using EVS suction traps baited with carbon dioxide around swamplands adjacent to the city of Darwin in northern Australia. Eleven sites were sampled weekly for five years, and one site weekly for 24 years, the sample of c. 1.4 million mosquitoes yielding 63 species. Mosquito abundance, species richness and diversity fluctuated seasonally, species richness being highly predictable. Ordination of assemblage composition demonstrated striking annual cycles that varied little from year to year. The mosquito assemblage was temporally structured by a succession of species peaks in abundance.

Ordination provided strong visual representation of annual rhythms in assemblage composition and the means to evaluate variability among years. Because most mosquitoes breed in shallow freshwater which fluctuates with rainfall, we did not anticipate such repeatability; we conclude that mosquito assemblage composition appears adapted to predictable elements of the rainfall.
Keywords tropical
annual cycles
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