A Communal Roosting of the Great Horned Owl (Bubo virginianus)

Robinson, Bryce W.; Davis, Caitlin

doi:10.3356/jrr-13-47.1

Cited by 1 publication

(5 citation statements)

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“…Nests proved to be more difficult to find in Arctic boreal forests than the mixed and deciduous forests at lower latitudes (Rohner and Doyle 1992;Little and Little 2018), leading to a small sample size of nests (n = 14). Half of these nests were also monitored using cameras.…”

Section: Discussionmentioning

confidence: 99%

“…We observed owls laying eggs directly into depressions in the witch's brooms without any apparent structure, as well as in crushed nestlike structures that could have been old raven nests. We located nests using a combination of methods from Shook (2002) and Rohner and Doyle (1992). We used call surveys to locate Great Horned Owls in January and February, before owls initiated nesting (Ronher and Doyle 1992;Reynolds et al 2021).…”

Section: Nest Searchingmentioning

confidence: 99%

“…We used call surveys to locate Great Horned Owls in January and February, before owls initiated nesting (Ronher and Doyle 1992;Reynolds et al 2021). After nesting began in late March-early April, we continued to use call surveys and conspecific broadcasts to elicit responses during the day and night following Rohner and Doyle (1992). When Great Horned Owls responded to playback, we used ArcGIS (ESRI 2017) to triangulate their location (Rohner and Doyle 1992).…”

Section: Nest Searchingmentioning

confidence: 99%

“…After nesting began in late March-early April, we continued to use call surveys and conspecific broadcasts to elicit responses during the day and night following Rohner and Doyle (1992). When Great Horned Owls responded to playback, we used ArcGIS (ESRI 2017) to triangulate their location (Rohner and Doyle 1992). We used systematic daytime searching on foot to locate nests within ~200 m radius of the triangulated location (Rohner and Doyle 1992;Shook 2002).…”

Section: Nest Searchingmentioning

confidence: 99%

“…When Great Horned Owls responded to playback, we used ArcGIS (ESRI 2017) to triangulate their location (Rohner and Doyle 1992). We used systematic daytime searching on foot to locate nests within ~200 m radius of the triangulated location (Rohner and Doyle 1992;Shook 2002). During these daytime nest searches, we examined all potential nest platforms for signs of occupation such as bone fragments, feathers, Snowshoe Hare feet, pellets, prey remains, and owl feathers stuck to branches.…”

Section: Nest Searchingmentioning

confidence: 99%

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Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit

et al. 2022

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We studied the diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern range limit during an apparent high in the Snowshoe Hare (Lepus americanus) population. We performed diet analyses using images from fixed motion sensor cameras and pellet and prey remains collected at active nests, and gathered data on breeding success through camera and visual observations. Pellet data at 14 nests produced 1277 prey records consisting of 65–95% Snowshoe Hare biomass. Great Horned Owls ate 18 different prey types, with overall biomass consisting of 93% mammal, 7% bird, and less than 1% insects, frogs, and fish. The mean prey mass of 714 g (± 34 SE) was 2–25 times the mean prey mass of studies of this species at more southerly latitudes. Camera observations showed that Great Horned Owls delivered an average of 459 g/chick/d (± 75) throughout nesting. This was significantly (P = 0.005) higher than observations from Alberta, at 328–411 g/chick/d. Pellet/prey remains data showed that Great Horned Owls delivering a higher proportion of hares to their nestlings successfully raised more chicks (χ21 = 6.3, P = 0.012), highlighting the importance of this prey in the population dynamics of Great Horned Owl. In addition, we observed Snowshoe Hare removing pellets beneath nest sites, revealing an apparently undocumented bias to the use of pellet analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Nest Searchingmentioning

confidence: 99%