Nest Site Use, Breeding Success, and Reproductive Rates of Chimney Swifts in St. Adolphe, MB, 2010-2013

Stewart, Barbara E.; Stewart, Robert E.

doi:10.29173/bluejay346

Cited by 3 publications

(15 citation statements)

References 4 publications

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“…As well, the 95% confidence limits around the parameter estimate for linear date included zero (Table 3). However, linear date had a reasonably large effect size compared to the other less important covariates, and we know time of season is biologically important for detection probability of adult Chimney Swifts at nest sites based on previous studies (Zammuto et al 1981, Stewart andStewart 2010). In particular, we found that detection probability was highest later in the nesting season, i.e., late July.…”

Section: Discussionsupporting

confidence: 61%

“…We investigate factors influencing the probability of detecting Chimney Swifts at active nest chimneys in order to make recommendations on a survey protocol that reliably determines nesting occupancy of chimneys and thus reduces nondetection error. Previous studies have shown that the time between chimney entries and exits by nesting Chimney Swifts varies with weather, time of day, and nestling age (Kendeigh 1952, Fischer 1958, Zammuto et al 1981, Stewart and Stewart 2010, 2013. In this study, we examine how temporal (time of day and season) and weather variables influence the probability of detecting Chimney Swifts at nest sites in southern Ontario, Canada.…”

Section: Introductionmentioning

confidence: 94%

“…Parental care demands of eggs/young change as nesting season progresses, which affects frequency of chimney entries/exits (Kendeigh 1952, Fischer 1958, Zammuto et al 1981, Stewart and Stewart 2010 +…”

Section: Time Of Seasonmentioning

confidence: 99%

“…Chimneys included in this study had been identified by volunteers as being occupied by nesting Chimney Swifts in a previous year, either through inspection of the chimney interior or ground observation of daytime activity, i.e., chimney entries and exits by Chimney Swifts. Observation of daytime activity at a chimney can be used to differentiate between roost and nest chimneys because Chimney Swifts typically return to roost chimneys only at sunset, whereas swifts visit nest chimneys throughout the day during the breeding season to nest build, incubate eggs, or feed young (Stewart and Stewart 2010).…”

Section: Chimney Surveysmentioning

confidence: 99%

“…Only one breeding pair usually occupies a nest chimney, although one to two nonbreeding "helpers" have been documented at nest sites (Fischer 1958, Dexter 1969). Furthermore, a breeding pair makes inconspicuous trips in and out of the chimney throughout the day to build a nest, incubate eggs, or feed young (Kendeigh 1952, Fischer 1958, Stewart and Stewart 2010, Steeves et al 2014.…”

Section: Introductionmentioning

confidence: 99%

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Timing matters: cloud cover and date influence probability of detecting nesting Chimney Swifts (Chaetura pelagica)

Purves¹,

Falconer²,

Tozer³

et al. 2019

ACE

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One third of bird species in North America need immediate conservation action. Effective management and recovery actions for species of conservation concern require accurate methods of monitoring species occurrence that limit the incidence of nondetection error (when a species is falsely recorded as absent when it is present). The Chimney Swift (Chaetura pelagica) is experiencing widespread population declines in North America, possibly, in part, because chimneys used for nesting or roosting are being capped or demolished. In particular, the presence of nesting swifts in a chimney can be difficult to determine, and thus, it is important to design survey protocols that limit the incidence of nondetection error. Here, we used data from Bird Studies Canada's Citizen Science program, Ontario SwiftWatch, and dynamic occupancy models to examine factors influencing the probability of detecting Chimney Swifts at nest sites. We found that the probability of detecting Chimney Swifts at nest chimneys decreased with increasing cloud cover. We also found some support suggesting that detection increased moderately with date over the course of the nesting period (June-July). Based on our findings, we recommend that surveys aiming to identify Chimney Swift nest sites in southern Ontario, Canada should be conducted for at least one hour under clear skies, and as late in the nesting period as possible. The results of this study will inform survey design to reduce the incidence of false negatives during chimney surveys for nest occupancy, and as a result, help reduce Chimney Swift nesting habitat disturbance and loss. Le choix du moment: la couverture nuageuse et la date ont une influence sur la probabilité de détecter les Martinets ramoneurs nicheursRÉSUMÉ. Un tiers des espèces d'oiseaux d'Amérique du Nord nécessitent des mesures de conservation immédiates. Des mesures efficaces de gestion et de rétablissement des espèces menacées exigent des méthodes précises de surveillance de l'occurrence des espèces qui limitent l'incidence des erreurs de non-détection (lorsqu'une espèce est faussement enregistrée comme étant absente alors qu'elle est présente). Le Martinet ramoneur (Chaetura pelagica) connaît un déclin généralisé de sa population en Amérique du Nord, peutêtre en partie parce que les cheminées utilisées pour la nidification ou le repos sont recouvertes ou démolies. En particulier, la présence de Martinets nicheurs dans une cheminée peut être difficile à déterminer. Il est donc important de concevoir des protocoles de relevé qui limitent l'incidence des erreurs de non-détection. Ici, nous avons utilisé les données du programme de science citoyenne SwiftWatch d'Études d'Oiseaux Canada, Ontario, ainsi que des modèles dynamiques d'occupation pour examiner les facteurs influant sur la probabilité de détecter des Martinets ramoneurs aux sites de nidification. Nous avons constaté que la probabilité de détecter des Martinets ramoneurs près des cheminées utilisées comme nichoir diminuait avec l'augmentation de la couverture nuageuse. N...

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Section: Discussionsupporting

confidence: 61%