The density of wintering toads is high in some mounds and low in others. Toads using a particular mound appear to constitute a distinct population. The factors which make some mounds more attractive than others have not been determined. It is possible that the differences may be related to ...
The State of Knowledge about Grizzly Bears (Kakenokuskwe osow Muskwa (Cree), Ursus arctos) in Northern Manitoba Grizzly bears have been observed with increasing frequency in northern Manitoba, Canada over the last four decades (1980 鈥 2020), likely originating from ... D Clark,AF Barnas,R ...
Local density estimates a range of 13–31 owls/km2 in Canada (Manitoba, Alberta, Saskatchewan and British Columbia) and the USA (Arizona, California, Colorado, Idaho, Iowa, Kansas, Minnesota, Montana, Nebraska, New Mexico, North and South Dakota, Oklahoma, Oregon, Texas, Utah and ...
Nestor 1 study site outside of Churchill, Manitobain June 1984, 1999, and 2000 to obtain estimates of population densities of tundranestingbirds and determine if density changes have occurred in relation to increasedgoose habitat damage... JE Sammler 被引量: 30发表: 2001年 加载更多来源...
These include external factors such as host population density and geographical location, and intrinsic factors such as genetic constitution, life history, and other conditions which may vary between individuals and host populations. Most of these studies have been conducted on rodents7–9. Many have...
The lack of heavy industry and of large metropolitan areas keeps Saskatchewan relatively free of the kinds of pollution associated with highpopulation densityand manufacturing, but the extensive agricultural development subjects it to the kinds connected with weed killers, insecticides, fertilizers, and li...
The factors responsible for the presence and diversity of parasites in free-ranging mammalian host populations have been the subject of an increasing number of investigations in the past two decades3,4,5,6,7,8,9. These include external factors such as host population density and geographical loca...
Additionally, increased density of birds due to frozen waters may have increased the likelihood of infection during this time. Following the detection of the newly introduced lineage H5N1 in early 2023, several mute swans (Cygnus olor) and a number of American black ducks in St. John’s were ...
In Manitoba, the two survey routes that had shrikes on them in 1987 were replicated in 1993, but not in 1998. In Alberta, the mean density of shrikes was 3.8 times higher in 1998 than in 1987. In Saskatchewan, shrike densities increased from 1987 to 1993 and declined from 1993 to ...
Aboriginal people are a sizable minority in some provinces – for example, in the western provinces of Manitoba and Saskatchewan, they constitute 15% of the population. It is in the North, however, that Aboriginal people are a significant segment of the population – 35% of the population of...