منابع مشابه
Snowy Owl Predation on Short-eared Owls
A problem confronting Snowy Owls (Nyctea scandiaca) in their southern incursions is the shortage of food. This difficulty is raised by the presence of other raptors that feed on small mammals. This note shows how little food is found by migrant Snowy Owls and indicates a complex temporary ecological solution. At Tatoosh Island, Washington (48”24’ N, 124” 44’ W) on 25 November 1973, we observed ...
متن کامل2nd Owl Symposium Snowy Owl ( Nyctea scandiaca ) Repr oduction in Relation to Lemming Population Cycles on W rangel Island
—Data on Snowy Owl ( Nyctea scandiaca) reproduction on Wrangel Island were collected for six seasons fr om a total of 423 nests. Nest densities ranged fr om 0.15 to 0.40 nests/km 2. Mean clutch size for all 6 years was 6.5 (fr om 5.3 to 8.4) being significantly higher during low lemming season (7.17) (N = 29) than for peak lemming season (6.0, p < 0.001). Clutch size corr elated with weather co...
متن کاملFatal encephalitis caused by Dactylaria constricta var. gallopava in a snowy owl chick (Nyctea scandiaca).
Dactylaria constricta var. gallopava (Cooke) Salkin et Dixon was found to cause fatal encephalitis in a 28-day-old, captivity-bred snowy owl chick (Nyctea scandiaca). The previously healthy bird suddenly developed ataxia, severe torticollis, and extensor rigidity of the legs. Since the animal did not improve with antibiotic or vitamin-mineral supplement therapy, the chick was euthanized 5 days ...
متن کاملSnowcat Track Detection in Snowy Environments∗
This paper describes the image processing techniques designed to localize tracks of snowcats for the Italian mission in Antarctica within the ENEA R.A.S. (Surface Antarctic Robot) project for the autonomous driving of intelligent snowcats. The final goal is to enable snowcats to automatically follow preceding ones. A camera is used to acquire images of the scene in realtime; the image sequence ...
متن کاملDisturbance to wintering western snowy plovers
In order to better understand the nature of disturbances to wintering snowy plovers, I observed snowy plovers and activities that might disturb them at a beach near Devereux Slough in Santa Barbara, California, USA. Disturbance (activity that caused plovers to move or fly) to wintering populations of threatened western snowy plovers was 16 times higher at a public beach than at protected beache...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1946
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay1100