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Comparison between window traps and pan traps in monitoring flower-visiting insects in agricultural fields

Published online by Cambridge University Press:  06 April 2022

Xiaoyu Shi
Affiliation:
Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China
Daomeng Fu
Affiliation:
Institute of Entomology, Jiangxi Agricultural University, Nanchang, China College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
Haijun Xiao*
Affiliation:
Institute of Entomology, Jiangxi Agricultural University, Nanchang, China School of Grassland Science, Beijing Forestry University, Beijing, China
Jenny A. Hodgson
Affiliation:
Department of Evolution, Ecology and Behaviour, University of Liverpool, Liverpool, UK
Dongyue Yan
Affiliation:
Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China
Yi Zou*
Affiliation:
Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China
*
Authors for correspondence: Haijun Xiao, Email: hjxiao@jxau.edu.cn; Yi Zou, Email: yi.zou@xjtlu.edu.cn
Authors for correspondence: Haijun Xiao, Email: hjxiao@jxau.edu.cn; Yi Zou, Email: yi.zou@xjtlu.edu.cn

Abstract

Sampling flower-visiting insects in agricultural fields at large spatial and temporal scales is significant for understanding local insect pollinator communities. The most commonly used method, pan trap, has been criticized due to its attractant bias. A window trap (also referred to as the flight-intercept trap) is a non-attractant sampling method, which has been applied in forests and grasslands, but rarely in agricultural fields. We aim to test whether we can replace pan traps with window traps in agricultural fields by comparing species richness and species composition between the two methods, and to show whether flower-visiting insects collected in both traps can reflect flower-visiting activity recorded by camera observation. We conducted a 2-year study to compare the performance of these sampling methods in an oilseed rape field. Results showed that the relative abundance of dominant flower-visiting species was highly correlated between the window trap and the pan trap samples, while window traps caught more individuals and higher (rarefied) species richness than pan traps. The species composition of window traps was more similar to each other than that of pan traps. The proportion of honey bees (Apis spp.) collected in both traps underestimated their flower-visiting activity recorded by camera observations, while sweat bees (Halictidae) and butterflies (Lepidoptera) were overestimated. Our study suggests that the window trap has the potential to serve as an alternative sampling method of flower-visiting insects to the pan trap. However, we need to be cautious when using specimens caught in both traps as a proxy of their flower-visiting activity.

Type
Research Paper
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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