A predator-induced population decline in one area appeared to stabilize at low caribou densities, suggesting that the wolf predation rate may be density dependent.doi:10.7557/2.16.4.1223Seip D.RCichowski D.BSwedish University of Agricultural SciencesRangifer...
GRIZZLY BEAR POPULATION DENSITY AND DISTRIBUTION IN THE SOUTHERN COAST RANGES OF BRITISH COLUMBIA 来自 env.gov.bc.ca 喜欢 0 阅读量: 22 作者: B Bateman 摘要: INTRODUCTION ... 4 Issue...
Population density and parasitism of larch casebearer, Coleophora laricella (Hübner), were monitored for 10 years before parasites introduced for biological control became abundant. Overwintering densities remained fairly stable at about 100 larvae per 100 buds. The factor most closely correlated with...
This technique first fits a model using all available covariates and the (log) population density of each administrative unit as the response. Then, a very conservative covariate selection process is performed to reduce the number of covariates that will be used for both the RF model fitting and...
Montana, constituent state of the U.S. The fourth-largest state by area, Montana also has the third-lowest population density in the country. It borders Canada to the north, North Dakota and South Dakota to the east, Wyoming to the south, and Idaho to th
These fluctua tions have been attributable to variability in freshwater and marine survival, and have been related to climatic factors such as rainfall (Wick ett 1958) and to population density or predation on fry (Hunter 1959). Chum salmon in British Columbia return to spawn in their natal ...
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For insect parasitoids the low density of the hosts during population troughs means it is likely that parasitoids will need other host species to survive and thus they will be generalists. This would also be the case for predators. The impact of these mortality agents must be both direct and...
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 ...
3. Overall, these results illustrated the dependency of GPS on the density of the reference population data set and indicated that accuracy improves with the inclusion of additional populations residing in geographically distant or isolated regions. GPS applicability using a thinner marker set. PC-...