Estimating the effect of tracking tag weight on insect movement using video analysis: A case study with a flightless orthopteran
In this study, we describe an inexpensive and rapid method of using video analysis and identity tracking to measure the effects of tag weight on insect movement. In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a fac...
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description | In this study, we describe an inexpensive and rapid method of using video analysis and identity tracking to measure the effects of tag weight on insect movement. In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a factor known to affect insect movement and behavior. We recorded the movements of groups of flightless adult crickets Gryllus locorojo (Orthoptera:Gryllidae) as affected by no tag (control); by light, medium, or heavy tags (198.7, 549.2, and 758.6 mg, respectively); and by low, intermediate, or high temperatures (19.5, 24.0, and 28.3°C, respectively). Each individual in each group was weighed before recording and was recorded for 3 consecutive days. The mean (± SD) tag mass expressed as a percentage of body mass before the first recording was 26.8 ± 3.7% with light tags, 72 ± 11.2% with medium tags, and 101.9 ± 13.5% with heavy tags. We found that the influence of tag weight strongly depended on temperature, and that the negative effects on movement generally increased with tag weight. At the low temperature, nearly all movement properties were negatively influenced. At the intermediate and high temperatures, the light and medium tags did not affect any of the movement properties. The continuous 3-day tag load reduced the average movement speed only for crickets with heavy tags. Based on our results, we recommend that researchers consider or investigate the possible effects of tags before conducting any experiment with tags in order to avoid obtaining biased results. |
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In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a factor known to affect insect movement and behavior. We recorded the movements of groups of flightless adult crickets Gryllus locorojo (Orthoptera:Gryllidae) as affected by no tag (control); by light, medium, or heavy tags (198.7, 549.2, and 758.6 mg, respectively); and by low, intermediate, or high temperatures (19.5, 24.0, and 28.3°C, respectively). Each individual in each group was weighed before recording and was recorded for 3 consecutive days. The mean (± SD) tag mass expressed as a percentage of body mass before the first recording was 26.8 ± 3.7% with light tags, 72 ± 11.2% with medium tags, and 101.9 ± 13.5% with heavy tags. We found that the influence of tag weight strongly depended on temperature, and that the negative effects on movement generally increased with tag weight. At the low temperature, nearly all movement properties were negatively influenced. At the intermediate and high temperatures, the light and medium tags did not affect any of the movement properties. The continuous 3-day tag load reduced the average movement speed only for crickets with heavy tags. Based on our results, we recommend that researchers consider or investigate the possible effects of tags before conducting any experiment with tags in order to avoid obtaining biased results.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0255117</identifier><identifier>PMID: 34293059</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Analysis ; Animal behavior ; Animals ; Arthropods ; Behavior ; Biology and Life Sciences ; Biotelemetry ; Body mass ; Body temperature ; Body Weight ; Case reports ; Computer and Information Sciences ; Crickets ; Ecology ; Engineering and Technology ; Experiments ; Flight, Animal - physiology ; Gryllidae - physiology ; High temperature ; Insects ; Linear Models ; Low temperature ; Methods ; Movement - physiology ; Orthoptera ; Radio frequency identification ; Recording ; Research and Analysis Methods ; Rest ; Social Sciences ; Tags ; Telemetry ; Temperature ; Temperature effects ; Tracking ; Weight</subject><ispartof>PloS one, 2021-07, Vol.16 (7), p.e0255117-e0255117</ispartof><rights>COPYRIGHT 2021 Public Library of Science</rights><rights>2021 Kaláb et al. 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In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a factor known to affect insect movement and behavior. We recorded the movements of groups of flightless adult crickets Gryllus locorojo (Orthoptera:Gryllidae) as affected by no tag (control); by light, medium, or heavy tags (198.7, 549.2, and 758.6 mg, respectively); and by low, intermediate, or high temperatures (19.5, 24.0, and 28.3°C, respectively). Each individual in each group was weighed before recording and was recorded for 3 consecutive days. The mean (± SD) tag mass expressed as a percentage of body mass before the first recording was 26.8 ± 3.7% with light tags, 72 ± 11.2% with medium tags, and 101.9 ± 13.5% with heavy tags. We found that the influence of tag weight strongly depended on temperature, and that the negative effects on movement generally increased with tag weight. At the low temperature, nearly all movement properties were negatively influenced. At the intermediate and high temperatures, the light and medium tags did not affect any of the movement properties. The continuous 3-day tag load reduced the average movement speed only for crickets with heavy tags. 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One</addtitle><date>2021-07-22</date><risdate>2021</risdate><volume>16</volume><issue>7</issue><spage>e0255117</spage><epage>e0255117</epage><pages>e0255117-e0255117</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>In this study, we describe an inexpensive and rapid method of using video analysis and identity tracking to measure the effects of tag weight on insect movement. In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a factor known to affect insect movement and behavior. We recorded the movements of groups of flightless adult crickets Gryllus locorojo (Orthoptera:Gryllidae) as affected by no tag (control); by light, medium, or heavy tags (198.7, 549.2, and 758.6 mg, respectively); and by low, intermediate, or high temperatures (19.5, 24.0, and 28.3°C, respectively). Each individual in each group was weighed before recording and was recorded for 3 consecutive days. The mean (± SD) tag mass expressed as a percentage of body mass before the first recording was 26.8 ± 3.7% with light tags, 72 ± 11.2% with medium tags, and 101.9 ± 13.5% with heavy tags. We found that the influence of tag weight strongly depended on temperature, and that the negative effects on movement generally increased with tag weight. At the low temperature, nearly all movement properties were negatively influenced. At the intermediate and high temperatures, the light and medium tags did not affect any of the movement properties. The continuous 3-day tag load reduced the average movement speed only for crickets with heavy tags. Based on our results, we recommend that researchers consider or investigate the possible effects of tags before conducting any experiment with tags in order to avoid obtaining biased results.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>34293059</pmid><doi>10.1371/journal.pone.0255117</doi><tpages>e0255117</tpages><orcidid>https://orcid.org/0000-0002-1739-0143</orcidid><orcidid>https://orcid.org/0000-0003-3485-9377</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Analysis Animal behavior Animals Arthropods Behavior Biology and Life Sciences Biotelemetry Body mass Body temperature Body Weight Case reports Computer and Information Sciences Crickets Ecology Engineering and Technology Experiments Flight, Animal - physiology Gryllidae - physiology High temperature Insects Linear Models Low temperature Methods Movement - physiology Orthoptera Radio frequency identification Recording Research and Analysis Methods Rest Social Sciences Tags Telemetry Temperature Temperature effects Tracking Weight |
title | Estimating the effect of tracking tag weight on insect movement using video analysis: A case study with a flightless orthopteran |
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