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Heterogeneity in song rates in the Collared Flycatcher(Ficedula albicollis)explained with the availability parameter in generalized N-mixture models:Its importance for abundance estimates in avian aural counts

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Avian Research 2023年第1期14卷 38-44页

作者： Grzegorz Neubauer Arkadiusz Sikora Laboratory of Forest Biology University of WroclawSienkiewicza 2150-335WrocławPoland Ornithological Station Museum and Institute of ZoologyPolish Academy of SciencesNadwislanska10880-680GdanskPoland

Binomial N-mixture models are commonly applied to estimate abundance unaffected by imperfect detection,but are known to be sensitive to violations of *** of the model’s assumptions,the independence of detections has rarely been *** requires that during a survey,detection of one individual does not affect detection of another *** assumption can be frequently violated in passerine birds,which exhibit territorial behaviour by singing,since neighbouring individuals are likely to motivate each other to vocalize,leading to non-independence in singing activity and in the following detection ***,we explored this phenomenon with the generalized,binomial version of the N-mixture model,where detection probability is decomposed into availability probability φ-which can be interpreted as per capita song rate or the probability of vocalising-and actual detection probability p,given vocalisations take *** repeated counts of the Collared Flycatcher(Ficedula albicollis)as a case study,and treating the maximum observed counts C_(maxi) at a site i as an explanatory covariate for φ,we showed that per capita song rates increased with observed counts at a ***,if song rates vary due to local abundance,including C_(maxi)as an explanatory variable for song rate addressed with φ,helps to explain this variation(which otherwise goes undetected)and improves inferences under the *** had strong effects on the resulting abundance estimates:if this relationship was ignored in the models,total estimated population sizes were consequently lower by as much as 22-27%,compared to when this effect was *** it is likely that song rates may commonly be density-dependent in birds manifesting territorial behaviours by singing,further tests addressing violations of independence assumptions in these models are *** suggested by Kery and Royle(2016),despite some form of circularity likely being involved,modelling heterogeneity in the detec

关键词： Abundance Awailabity bird∞mt Dansity dpendent detection Ganerlizd N minture models Singing sactiwity Song Tate

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