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14 October 2019 How the Distance Between Drag-Cloth Checks Affects the Estimate of Adult and Nymphal Ixodes scapularis (Acari: Ixodidae) Density
Ben Borgmann-Winter, David Allen
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Abstract

Drag-cloth sampling is the most commonly used method to sample for ticks. A cloth is dragged along the ground and checked for ticks at regular intervals to count ticks before they drop off.The distance between drag-cloth checks differs between studies, which could result in lower density estimates for studies with greater distances between checks. Here, we measured this effect by 1) calculating the rate at which nymphal and adult Ixodes scapularis Say ticks drop off the cloth per meter dragged and 2) measuring tick density by drag-cloth sampling with three different drag-cloth check interval distances. We found a higher drop-off rate for adult ticks, 0.083/m, than nymphal ticks, 0.047/m.The estimated density of ticks decreased with increasing check interval distance. Our results not only highlight the importance of accounting for check interval distance when estimating tick density, but also provide the first estimate of nymphal I. scapularis drop-off rate.

© The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Ben Borgmann-Winter and David Allen "How the Distance Between Drag-Cloth Checks Affects the Estimate of Adult and Nymphal Ixodes scapularis (Acari: Ixodidae) Density," Journal of Medical Entomology 57(2), 623-626, (14 October 2019). https://doi.org/10.1093/jme/tjz179
Received: 5 July 2019; Accepted: 6 September 2019; Published: 14 October 2019
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KEYWORDS
drag-cloth sampling
Ixodes scapularis
nymph
sampling bias
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