Factors affecting roost departure and entry by wintering merlins

Warkentin, Ian G.

doi:10.1139/z86-195

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…It is possible that daytime-foraging areas offered enough protection that the effect of wind speed was negligible. Similar results and conclusions have been reached in other studies (e.g., Reebs 1986;Warkentin 1986).…”

Section: Discussionsupporting

confidence: 92%

“…To generate answers to this question, it is necessary to consider dawn and dusk separately, as low temperature was not similarly correlated with activity at both times. In other studies, where the effect of cold was studied on both departure and arrival times, cold was always correlated with late departures and early arrivals ( a decrease of activity at both ends of the day; see Zammuto and Franks 198 1;Reebs 1986;Warkentin 1986). For Mourning Doves, cold did lead to late departures, but also led to late rather than early arrivals.…”

Section: Discussionmentioning

confidence: 89%

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Influence of temperature and other factors on the daily roosting times of Mourning Doves in winter

Doucette¹,

Reebs²

1994

Can. J. Zool.

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observations were made during 30 departures and 30 arrivals at a Mourning Dove (Zenaida mat-l-oul-a) roost in Moncton, New Brunswick, Canada. Our objective was to identify the effect of cold on the timing of roosting flights in this species, a recent addition to the local wintering fauna. The effect of other environmental factors was taken into account by including them, along with temperature, in a multiple regression analysis. Doves left the roost later relative to sunrise ( i ) on longer days, ( i i ) on cloudy mornings, ( i i i ) when fewer birds were using the roosts, ( i v ) on colder mornings, and ( 1 1 ) when winds were high. They returned to the roost later relative to sunset ( i ) on colder evenings and ( i i ) in clear weather. Late arrivals on colder days represent an unusual finding. Anatomical and behavioural considerations suggest that Mourning Doves cannot reduce heat loss as substantially as other species; therefore, late arrivals on cold evenings may reflect the more important role of energy gain through extended foraging required to survive the long winter night. DOUCETTE, D.R., et REEBS, S.G. 1994. Influence of temperature and other factors on the daily roosting times of Mourning Doves in winter. Can. J. Zool. 72 : 1287-1290. De novembre 1992 a fevrier 1993, 30 observations de departs et d'arrivees ont ete effectuees a un dortoir de Tourterelles tristes (Zenuidu mact-oura) a Moncton, Nouveau-Brunswick, Canada. L'objectif etait de determiner si le froid avance ou retarde le moment du depart et de l'arrivee chez cette espkce qui a commence, depuis peu, a passer l'hiver au Canada. L'effet d'autres variables environnementales a aussi ete mesure en incluant ces dernikres dans une analyse de regression multiple.Les tourterelles ont retard6 leur depart par rapport au lever du soleil ( i ) lors de journees longues, ( i i ) lors de matins ennuages, ( i i i ) quand moins d'oiseaux etaient presents au dortoir, ( i v ) quand il faisait plus froid et ( v ) par grands vents. Elles ont retard6 leur arrivee par rapport au coucher du soleil ( i ) quand il faisait plus froid et ( i i ) lors d'aprks-midis sans nuages. L'arrivCe tardive lors de temps froids, rarement observee chez d'autres espkces, s'explique peut-Stre chez la tourterelle par un besoin de consommer plus de nourriture en vue de pouvoir generer plus de chaleur pour compenser la deperdition calorifique occassionnee par un manque d'adaptation anatomique et comportementale.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 89%

Influence of temperature and other factors on the daily roosting times of Mourning Doves in winter

Doucette¹,

Reebs²

1994

Can. J. Zool.

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“…Our finding that first nest departure time was not affected by temperature aligns with observations from 2 previous studies of breeding passerines (Kluijver 1950, Nolan 1978, but stands in contrast to the results of most studies of roosting birds, which have found that cold temperatures delay roost departure times (Brodsky and Weatherhead 1984, Reebs 1986, Warkentin 1986, Everding and Jones 2006, Xu et al 2008. This difference could reflect differences between the breeding and nonbreeding periods or greater thermoregulatory challenges posed by colder temperatures during the nonbreeding season.…”

Section: Discussionsupporting

confidence: 87%

“…To date, most research on the timing of first morning activity either has focused on the importance of light levels (Nice 1943, Davis and Lussenhop 1970, Swingland 1976 or has evaluated the effects of temperature during the nonbreeding season. For example, several studies have shown that cold temperatures increase time spent at roost sites (Brodsky and Weatherhead 1984, Reebs 1986, Warkentin 1986, Everding and Jones 2006, Xu et al 2008; but see Doucette and Reebs 1994). However, patterns observed during winter may not be maintained during the breeding season, when the activity patterns of nesting birds depend on both parental Western North American Naturalist 74(1), © 2014, pp.…”

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confidence: 99%

Temperature Does Not Affect the Timing of First Nest Departure in Orange-Crowned Warblers

Ims

Sofaer

Sillett

et al. 2014

Western North American Naturalist

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Effect of weather conditions on the communal roosting behaviour of common ravens Corvus corax with unlimited food resources

Janicke

Chakarov

2006

J Ethol

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Avian time-activity budgets are known to be affected by many environmental factors. The aim of this study was to examine whether roosting times of common ravens Corvus corax are affected by inclement weather conditions in response to increased energy demands. The study was conducted at a communal roost of ravens in Thuringia, Germany, from August 2003 to January 2005. The number of roosting ravens fluctuated substantially, ranging from zero individuals in summer to 574 in winter. During the entire study period, a composting facility served as the main feeding ground for roosting ravens. There, the feeding-toresting ratio did not depend on flock size, indicating the ravens were not food limited. Ravens arrived at the preroost and the roost later relative to sunset on cloudless evenings and on days with shorter length of daylight. Weather conditions measured as ambient temperature, wind speed, and cumulative daily precipitation had no effect on arrival times at the preroost and the roost. Likewise, moonlight did not affect roosting times. Apparently, flexible time-activity budgets resulting from a superabundant food supply may have enabled ravens to moderate the effects of environmental conditions on arrival times at the preroost and the roost.

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Factors affecting roost departure and entry by wintering merlins

Cited by 7 publications

References 15 publications

Influence of temperature and other factors on the daily roosting times of Mourning Doves in winter

Influence of temperature and other factors on the daily roosting times of Mourning Doves in winter

Temperature Does Not Affect the Timing of First Nest Departure in Orange-Crowned Warblers

Effect of weather conditions on the communal roosting behaviour of common ravens Corvus corax with unlimited food resources

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