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Do surveys of adult dragonflies and damselflies yield repeatable data? Variation in monthly counts of abundance and species richness
Journal of Insect Conservation ( IF 1.9 ) Pub Date : 2020-08-08 , DOI: 10.1007/s10841-020-00260-0
James W. Pearce-Higgins , David Chandler

There is considerable debate over the most appropriate method for surveying dragonflies and damselflies (odonates). Using data from 62 survey locations nested within 26 waterbodies at 15 sites (discrete parcels of common ownership) in West Suffolk, UK, we show that short (20 m line transects or 3 min duration point counts), monthly counts of adults are repeatable. Correlations between predictions from models accounting for variation in ambient conditions and time of day and 52 separate counts used for validation equalled r = 0.87 for total abundance and r = 0.75 for species richness. Correlation coefficients between observed and modelled abundance exceeded 0.5 for eight of fourteen species modelled individually. Ambient temperature was the most important weather variable that influenced survey results, affecting the abundance of nine species, total abundance and species’ richness. Most of the spatial variation in survey results was between waterbodies, rather than between sites or at individual survey locations, suggesting that adult counts may indicate aspects of waterbody quality, although differences in these patterns were observed between dragonflies (Anisoptera) and damselflies (Zygoptera). Encouraging relatively infrequent and rapid counts of flying adults may therefore be used to increase volunteer participation in citizen (community) science odonate monitoring schemes whilst also providing repeatable abundance and species richness data that can contribute to research and monitoring programmes.

中文翻译:

对成年蜻蜓和豆娘的调查是否会产生可重复的数据?每月丰度和物种丰富度计数的变化

关于调查蜻蜓和豆娘(蜻蜓)的最合适方法存在相当大的争论。使用来自英国西萨福克 15 个地点(共同所有权的离散地块)的 26 个水体中嵌套的 62 个调查地点的数据,我们表明短(20 m 线横断面或 3 分钟持续时间点计数)的成年人每月计数是可重复的。考虑环境条件和一天中时间变化的模型的预测与用于验证的 52 个单独计数之间的相关性等于总丰度的 r = 0.87 和物种丰富度的 r = 0.75。对于单独建模的 14 种物种中的 8 种,观察到的丰度和建模的丰度之间的相关系数超过 0.5。环境温度是影响调查结果的最重要的天气变量,影响了九个物种的丰度,总丰度和物种丰富度。调查结果的大部分空间变化发生在水体之间,而不是地点之间或个别调查地点,这表明成虫数量可能表明水体质量的各个方面,尽管在蜻蜓(Anisoptera)和豆娘(Zygoptera)之间观察到这些模式的差异. 因此,鼓励相对不频繁和快速的飞行成年人计数可用于增加公民(社区)科学监测计划的志愿者参与,同时还提供可用于研究和监测计划的可重复的丰度和物种丰富度数据。表明成年数量可能表明水体质量的各个方面,尽管在蜻蜓(Anisoptera)和豆娘(Zygoptera)之间观察到这些模式的差异。因此,鼓励相对不频繁和快速的飞行成年人计数可用于增加公民(社区)科学监测计划的志愿者参与,同时还提供可用于研究和监测计划的可重复的丰度和物种丰富度数据。表明成年数量可能表明水体质量的各个方面,尽管在蜻蜓(Anisoptera)和豆娘(Zygoptera)之间观察到这些模式的差异。因此,鼓励相对不频繁和快速的飞行成年人计数可用于增加公民(社区)科学监测计划的志愿者参与,同时还提供可用于研究和监测计划的可重复的丰度和物种丰富度数据。
更新日期:2020-08-08
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