Factors affecting detection probability, effective area surveyed, and species misidentification in grassland bird point counts

IF 2.6 2区 生物学 Q1 ORNITHOLOGY
Condor Pub Date : 2019-08-26 DOI:10.1093/condor/duz030
Elizabeth A. Rigby, Douglas H. Johnson
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引用次数: 5

Abstract

ABSTRACT We simulated bird surveys using recorded bird songs to assess factors affecting detection probability in grassland bird point counts. We used mixed effects logistic regression models to estimate effects of those factors and to estimate and visualize the variation in the area around the observer where birds can be perceived (the perception area). We simulated surveys with 8,926 binary opportunities for detection in Minnesota grasslands in 2011 and 2012. Species, distance to the observer, wind speed and direction, observer, and density of vegetation all affected detection of recorded bird songs. Species had a strong effect; the size of the predicted perception area around the observer differed by an order of magnitude among species. Wind also had a strong effect on detection. As wind speed increased, probability of detection downwind of the observer was reduced and the perception area around the observer became smaller and more asymmetrical. The effective distance at which an observer is more likely to detect a bird than not detect it may differ among species and angles to the wind, even within the same survey. Eight of 10 species had low probability of misidentification (≤0.03), but Grasshopper Sparrow (Ammodramus savannarum) and LeConte's Sparrow (Ammospiza leconteii) were frequently misidentified (probability = 0.09–0.24 among observers), contributing to a low rate of correct detection for those species. We recommend collecting point-count data within distance bands so that data can be analyzed based on the effective radius for each species and standardizing surveys across wind conditions to reduce variation in detection probability.
草地鸟类点计数检测概率、有效调查面积和物种误认的影响因素
摘要:我们使用记录的鸟鸣模拟鸟类调查,以评估影响草原鸟类点计数检测概率的因素。我们使用混合效应逻辑回归模型来估计这些因素的影响,并估计和可视化观察者周围可以感知鸟类的区域(感知区域)的变化。2011年和2012年,我们在明尼苏达州草原模拟了8926次二元探测机会的调查。物种、与观测者的距离、风速和风向、观测者和植被密度都影响了对记录鸟鸣的检测。物种具有强烈的影响;观察者周围预测感知区域的大小在物种之间相差一个数量级。风对探测也有很大影响。随着风速的增加,观察者在下风处被探测到的概率降低,观察者周围的感知区域变得更小、更不对称。即使在同一次调查中,观察者更有可能探测到鸟类的有效距离也可能因物种和风的角度而异。10个物种中有8个物种的误认概率较低(≤0.03),但Grasshopper Sparrow(Ammodramus salvanarum)和LeConte’s Sparrow(Ammospiza leconteii)经常被误认(观察者中的概率=0.09–0.24),导致这些物种的正确检测率较低。我们建议收集距离带内的点计数数据,以便根据每个物种的有效半径对数据进行分析,并对风况下的调查进行标准化,以减少检测概率的变化。
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来源期刊
Condor
Condor ORNITHOLOGY-
CiteScore
6.30
自引率
12.50%
发文量
46
审稿时长
6-12 weeks
期刊介绍: The Condor is the official publication of the Cooper Ornithological Society, a non-profit organization of over 2,000 professional and amateur ornithologists and one of the largest ornithological societies in the world. A quarterly international journal that publishes original research from all fields of avian biology, The Condor has been a highly respected forum in ornithology for more than 100 years. The journal is one of the top ranked ornithology publications. Types of paper published include feature articles (longer manuscripts) Short Communications (generally shorter papers or papers that deal with one primary finding), Commentaries (brief papers that comment on articles published previously in The Condor), and Book Reviews.
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