Nocturnal Energy Expenditure of Dark-Eyed Juncos Roosting in Indiana during Winter

Webb, Diane; Rogers, Christopher M.

doi:10.2307/1368439

Cited by 37 publications

(21 citation statements)

References 13 publications

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“…In some studies, the importance of wind speed reduction inside the cavity was mentioned (e.g. Walsberg 1986;Webb and Rogers 1988;Cooper 1999). Such influence on birds' behaviour was not tested in our experiment but nonetheless, we suggest that Great Tits are able to select a roost with a more suitable microclimate before they go to sleep.…”

Section: Discussionmentioning

confidence: 69%

“…dense vegetation) or secure (e.g. tree cavity) roost sites, and second, which roost sites provide the more suitable microclimate (cf., Mayer et al 1982;Walsberg 1986;Webb and Rogers 1988;Cooper 1999). With Tree Sparrows (Passer montanus), it was found that individuals roosting in a nest-box saved 18% of energy and in a nest-box filled with old nesting material saved up to 36% (Pinowski et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Some cavity-nesting passerine species in temperate-zone forests use tree cavities for winter roosting (Busse and Olech 1968;Winkel and Hudde 1988;Báldi and Csörg} o 1994;Krištín et al 2001;Mazgajski 2002;Otter 2007). In comparison to open sites in vegetation, enclosed roosts (tree cavities or nest-boxes) decrease their energetic costs during the night in more extreme weather conditions (Mayer et al 1982;Walsberg 1986;Webb and Rogers 1988;Cooper 1999). In winter temperatures, birds roosting in a nest-box save 10-38% of energy expended through the night (Kendeigh 1944(Kendeigh , 1961Cooper 1999;Pinowski et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Selection of winter roosts in the Great Tit Parus major: influence of microclimate

2009

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The success in energy saving in roosting Great Tits (Parus major) is potentially influenced by roost microclimatic characteristics. We tried to learn about the pattern in cavity microclimate influence on night roosting of birds, under natural weather conditions. An experimental aviary offered two artificial tree-roosts with different microclimatic conditions which varied according to the outdoor conditions (mainly due to solar radiation) and microclimate retention capability of roosts. Birds actively explored roosts before the final choice of sleeping site. Two hours prior to sunset, there were significant differences between the roosts (n = 11 adult males tested, each six nights). Selected roosts had higher average temperature (Wilcoxon matched pairs test, P = 0.017) and temperature at the time of sunset (P = 0.028). Simultaneously, inside temperature decreased slowly (P = 0.047). During the night, when birds slept in one of the roosts, the average temperature was higher (P \ 0.001) and the fluctuation range of temperatures was smaller (P = 0.003) there. Moreover, at the morning twilight, the temperature of the occupied roost was higher (P \ 0.001). Humidity did not have a significant influence at all. The effect of metabolic heating was demonstrated. When birds slept in the insulated roost (n = 30 nights), the indoor average temperature significantly differed from the non-insulated and outdoor temperatures (Kruskal-Wallis ANOVA, P = 0.0001). Selection of an actually warmer and thermally more stable roost according to the course of weather indicates demand for a wide spectrum of potential roosts in the natural environment.

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selection of winter roosts in the Great Tit Parus major: influence of microclimate

2009

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“…Firstly, we aimed to determine whether the ability to detect predator chemical cues for roosting selection is innate in birds. Roosting may be an important behaviour for overwinter survival, as one of the benefits of sleeping in a cavity is a decrease in energetic costs during cold nights (Walsberg 1986, Webb & Rogers 1988. Birds actively select warmer and thermally more stable roosting places (Vel v ký et al 2010).…”

Section: Smelling Out Predators Is Innate In Birdsmentioning

confidence: 99%

Smelling Out Predators is Innate in Birds

Amo

Visser

Oers

2011

Ardea

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“…Clear evidence for temperature-based roost cavity selection in birds is missing. Some evidence exists for non-cavity roosting species, which select mainly wind-protected roost sites within vegetation cover (Buttemer 1985;Walsberg 1986;Webb and Rogers 1988). Of the other vertebrates, bats select warmer cavities for summer roosting, which is especially important for juveniles that may suffer from nighttime cold (Sedgeley 2001).…”

Section: Implications For Roosting Birdsmentioning

confidence: 99%

Microclimate of tree cavities during winter nights—implications for roost site selection in birds

Paclík

Weidinger

2007

Int J Biometeorol

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We examined the relationships between cavity temperature, ambient temperature outside the cavity and structural characteristics of 70 cavities measured for 1 night to determine if cavity roosting birds may potentially select warmer tree cavities for wintertime roosting. The mean temperature increment of the cavity (=cavity-ambient temperature) varied from -2.4 to 4.9 degrees C and increased with higher day-to-night fluctuations in the ambient temperature, smaller cavity entrance and better health status of the cavity tree. Cavities in healthy trees were warmer than those in dead trees, but this difference disappeared with rising mean ambient temperatures. This interaction between the effects of tree health status and mean ambient temperature, as well as the effect of day-to-night fluctuations in the ambient temperature, were supported by the analysis of repeated measurements of temperature taken on 12 consecutive nights in five cavities. The variability in cavity microclimates makes the selection of warmer roost sites possible, and the predictors of microclimate may provide indirect cues to prospecting birds.

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Nocturnal Energy Expenditure of Dark-Eyed Juncos Roosting in Indiana during Winter

Cited by 37 publications

References 13 publications

Selection of winter roosts in the Great Tit Parus major: influence of microclimate

Selection of winter roosts in the Great Tit Parus major: influence of microclimate

Smelling Out Predators is Innate in Birds

Microclimate of tree cavities during winter nights—implications for roost site selection in birds

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