منابع مشابه
Survival of Mallard Broods in South-Central North Dakota
-Survival characteristics of 25 broods of Mallards (Anas platyrhynchos) were determined on a study area in the Missouri Coteau of south-central North Dakota in 1976-1977. Radio-equipped Mallard hens fledged at least one duckling in 7 of 16 (44%) broods produced in 1976, 5 of 9 (55%) in 1977, and 12 of 25 (48%) for both years combined. Of the 13 broods in which all young were lost, 11 (85%) were...
متن کاملLincoln estimates of mallard (Anas platyrhynchos) abundance in North America
Estimates of range-wide abundance, harvest, and harvest rate are fundamental for sound inferences about the role of exploitation in the dynamics of free-ranging wildlife populations, but reliability of existing survey methods for abundance estimation is rarely assessed using alternative approaches. North American mallard populations have been surveyed each spring since 1955 using internationall...
متن کاملEffects of dietary vanadium in mallard ducks.
Acult mallard ducks fed 0, 1, 10, or 100 ppm vanadyl sulfate in the diet were sacrificed after 12 wk on treatment; tissues were analyzed for vanadium. No birds died during the study and body weights did not change. Vanadium accumulated to higher concentrations in the bone and liver than in other tissues. Concentrations in bones of hens were five times those in bones of drakes, suggesting an int...
متن کاملVocalizations of the Mallard (anas Platyrhynchos)
Weidmann 1956; Johnsgard 1965; McKinney compartment was then placed into a 90 ft x 90 ft x 12 ft flight pen. Thus, each of the two observation 1965a, 1969, 1970), and quantitative data are pens had a group of four pairs that had been visually available for visual displays of a few species separated for 5 months. of ducks (e.g., Weidmann 1958; Weidmann Birds were individually marked with colored...
متن کاملFemoral Perforation after Hemiarthroplasty – Life goes on for 7 years!
INTRODUCTION Femoral perforation after hemiarthroplasty is a known complication. In cases with cemented hemiarthroplasty the recommendation is to leave the implant till it requires revision while for uncemented hemiarthroplasty early revision is recommended. CASE REPORT We present a case of perforation of lateral femoral cortex after Autin Moore hemiarthroplasty.. The patient reported a swell...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1960
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay2286