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Validating a common tick survey method: cloth-dragging and line transects

Kjellander, Pia L. and Aronsson, Malin and Alm Bergvall, Ulrika and Carrasco, Josep L. and Christensson, Madeleine and Lindgren, Per-Eric and Åkesson, Mikael and Kjellander, Petter (2021). Validating a common tick survey method: cloth-dragging and line transects. Experimental and Applied Acarology. 83 , 131-146
[Research article]

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Abstract

Cloth-dragging is the most widely-used method for collecting and counting ticks, but there are few studies of its reliability. By using cloth-dragging, we applied a replicated line transects survey method, in two areas in Sweden with different Ixodes ricinus tick-densities (low at Grimso and high at Bogesund) to evaluate developmental stage specific repeatability, agreement and precision in estimates of tick abundance. 'Repeatability' was expressed as the Intraclass Correlation Coefficient (ICC), 'agreement' with the Total Deviation Index (TDI) and 'precision' by the coefficient of variation (CV) for a given dragging distance. Repeatability (ICC) and agreement (TDI) were higher for the most abundant instar (nymphs) and in the area of higher abundance. At Bogesund tick counts were higher than at Grimso and so also repeatability, with fair to substantial ICC estimates between 0.22 and 0.75, and TDI ranged between 1 and 44.5 counts of difference (thus high to moderate agreement). At Grimso, ICC was poor to moderate and ranged between 0 and 0.59, whereas TDI remained low with estimates lower or equal to 1 count (thus high agreement). Despite a 100-fold lower abundance at Grimso, the same level of precision for nymphs could be achieved with a 70% increase of dragging effort. We conclude that the cloth-dragging technique is useful for surveying ticks' and primarily to estimate abundance of the nymphal stage, whereas it rarely will be recommended for larvae and adults.

Authors/Creators:Kjellander, Pia L. and Aronsson, Malin and Alm Bergvall, Ulrika and Carrasco, Josep L. and Christensson, Madeleine and Lindgren, Per-Eric and Åkesson, Mikael and Kjellander, Petter
Title:Validating a common tick survey method: cloth-dragging and line transects
Series Name/Journal:Experimental and Applied Acarology
Year of publishing :2021
Volume:83
Page range:131-146
Number of Pages:16
Publisher:SPRINGER
ISSN:0168-8162
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Ixodes, Repeatability, Tick, Dragging, Total deviation index, Validation
URN:NBN:urn:nbn:se:slu:epsilon-p-109721
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109721
Additional ID:
Type of IDID
DOI10.1007/s10493-020-00565-4
Web of Science (WoS)000593048400001
ID Code:21225
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:14 Jan 2021 13:23
Metadata Last Modified:14 Jan 2021 13:31

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