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Predicting avian distributions to evaluate spatiotemporal overlap with locust control operations in eastern Australia.

Szabo,JK, Davy,PJ, Hooper,MJ and Astheimer,LB 2009, Predicting avian distributions to evaluate spatiotemporal overlap with locust control operations in eastern Australia., Ecological Applications, vol. 19, no. 8, pp. 2026-2037, doi: 10.1890/08-0264.1.

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Title Predicting avian distributions to evaluate spatiotemporal overlap with locust control operations in eastern Australia.
Author(s) Szabo,JK
Davy,PJ
Hooper,MJ
Astheimer,LB
Journal name Ecological Applications
Volume number 19
Issue number 8
Start page 2026
End page 2037
Total pages 12
Publisher Ecological Society of America
Place of publication Washington DC
Publication date 2009-12
ISSN 1051-0761
Keyword(s) Australian plague locust
Avian species occurrence
Chortoicetes terminifera
Ecotoxicology
Fipronil
Generalized linear models
Locust control pesticides
Locust outbreaks
Organophosphates
Predictive models
Risk of exposure to pesticides
Summary Locusts and grasshoppers cause considerable economic damage to agriculture worldwide. The Australian Plague Locust Commission uses multiple pesticides to control locusts in eastern Australia. Avian exposure to agricultural pesticides is of conservation concern, especially in the case of rare and threatened species. The aim of this study was to evaluate the probability of pesticide exposure of native avian species during operational locust control based on knowledge of species occurrence in areas and times of application. Using presence-absence data provided by the Birds Australia Atlas for 1998 to 2002, we developed a series of generalized linear models to predict avian occurrences on a monthly basis in 0.5 degrees grid cells for 280 species over 2 million km2 in eastern Australia. We constructed species-specific models relating occupancy patterns to survey date and location, rainfall, and derived habitat preference. Model complexity depended on the number of observations available. Model output was the probability of occurrence for each species at times and locations of past locust control operations within the 5-year study period. Given the high spatiotemporal variability of locust control events, the variability in predicted bird species presence was high, with 108 of the total 280 species being included at least once in the top 20 predicted species for individual space-time events. The models were evaluated using field surveys collected between 2000 and 2005, at sites with and without locust outbreaks. Model strength varied among species. Some species were under- or over-predicted as times and locations of interest typically did not correspond to those in the prediction data set and certain species were likely attracted to locusts as a food source. Field surveys demonstrated the utility of the spatially explicit species lists derived from the models but also identified the presence of a number of previously unanticipated species. These results also emphasize the need for special consideration of rare and threatened species that are poorly predicted by presence-absence models. This modeling exercise was a useful a priori approach in species risk assessments to identify species present at times and locations of locust control applications, and to discover gaps in our knowledge and need for further focused data collection.
Language eng
DOI 10.1890/08-0264.1
Field of Research 060299 Ecology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Ecological Society of America
Persistent URL http://hdl.handle.net/10536/DRO/DU:30067959

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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