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Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock

BACKGROUND: Estimating the abundance of Culicoides using light traps is influenced by a large variation in abundance in time and place. This study investigates the optimal trapping strategy to estimate the abundance or presence/absence of Culicoides on a field with grazing animals. We used 45 light...

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Autores principales: Kirkeby, Carsten, Stockmarr, Anders, Bødker, René, Lind, Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682942/
https://www.ncbi.nlm.nih.gov/pubmed/23705770
http://dx.doi.org/10.1186/1756-3305-6-151
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author Kirkeby, Carsten
Stockmarr, Anders
Bødker, René
Lind, Peter
author_facet Kirkeby, Carsten
Stockmarr, Anders
Bødker, René
Lind, Peter
author_sort Kirkeby, Carsten
collection PubMed
description BACKGROUND: Estimating the abundance of Culicoides using light traps is influenced by a large variation in abundance in time and place. This study investigates the optimal trapping strategy to estimate the abundance or presence/absence of Culicoides on a field with grazing animals. We used 45 light traps to sample specimens from the Culicoides obsoletus species complex on a 14 hectare field during 16 nights in 2009. FINDINGS: The large number of traps and catch nights enabled us to simulate a series of samples consisting of different numbers of traps (1-15) on each night. We also varied the number of catch nights when simulating the sampling, and sampled with increasing minimum distances between traps. We used resampling to generate a distribution of different mean and median abundance in each sample. Finally, we used the hypergeometric distribution to estimate the probability of falsely detecting absence of vectors on the field. The variation in the estimated abundance decreased steeply when using up to six traps, and was less pronounced when using more traps, although no clear cutoff was found. CONCLUSIONS: Despite spatial clustering in vector abundance, we found no effect of increasing the distance between traps. We found that 18 traps were generally required to reach 90% probability of a true positive catch when sampling just one night. But when sampling over two nights the same probability level was obtained with just three traps per night. The results are useful for the design of vector monitoring programmes on fields with grazing animals.
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spelling pubmed-36829422013-06-15 Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock Kirkeby, Carsten Stockmarr, Anders Bødker, René Lind, Peter Parasit Vectors Short Report BACKGROUND: Estimating the abundance of Culicoides using light traps is influenced by a large variation in abundance in time and place. This study investigates the optimal trapping strategy to estimate the abundance or presence/absence of Culicoides on a field with grazing animals. We used 45 light traps to sample specimens from the Culicoides obsoletus species complex on a 14 hectare field during 16 nights in 2009. FINDINGS: The large number of traps and catch nights enabled us to simulate a series of samples consisting of different numbers of traps (1-15) on each night. We also varied the number of catch nights when simulating the sampling, and sampled with increasing minimum distances between traps. We used resampling to generate a distribution of different mean and median abundance in each sample. Finally, we used the hypergeometric distribution to estimate the probability of falsely detecting absence of vectors on the field. The variation in the estimated abundance decreased steeply when using up to six traps, and was less pronounced when using more traps, although no clear cutoff was found. CONCLUSIONS: Despite spatial clustering in vector abundance, we found no effect of increasing the distance between traps. We found that 18 traps were generally required to reach 90% probability of a true positive catch when sampling just one night. But when sampling over two nights the same probability level was obtained with just three traps per night. The results are useful for the design of vector monitoring programmes on fields with grazing animals. BioMed Central 2013-05-24 /pmc/articles/PMC3682942/ /pubmed/23705770 http://dx.doi.org/10.1186/1756-3305-6-151 Text en Copyright © 2013 Kirkeby et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Short Report
Kirkeby, Carsten
Stockmarr, Anders
Bødker, René
Lind, Peter
Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title_full Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title_fullStr Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title_full_unstemmed Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title_short Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock
title_sort spatio-temporal optimization of sampling for bluetongue vectors (culicoides) near grazing livestock
topic Short Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682942/
https://www.ncbi.nlm.nih.gov/pubmed/23705770
http://dx.doi.org/10.1186/1756-3305-6-151
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