Exotic species arrive in the state by several avenues. Some exotic species have been intentionally released and encouraged to proliferate. A number of species of game birds (such as chukar, white-tailed ptarmigan, and wild turkey) and sport fish (such as large-mouth bass) were introduced by the Oregon Department of Fish and Wildlife (formerly the Oregon Game Commission) (Evanich 1986). Such int...

Biomass and energy evaluation was carried out in the Municipality of Teresópolis Rio de Janeiro, Brazil. Th e following agricultural and natural systems were considered: (i) vegetables systems (leaf, fruit and mixed vegetables); (ii) citrus; (iii) ecological agro-forestry; (iv) cattle ranching, (v) silvopastoril systems, (vi) forest fragments and, (vii) forest in regeneration stage (1, 2 and 3 ...

For many of Utah’s rural communities, the problem of either growth or decline has been compounded by dependency on public lands and the changing perceptions by the general public of how these lands should be used. Utah communities whose economies have revolved around farming, ranching, and extraction of natural resources have depended upon access to and use of public lands, but use of these lan...

Our analysis begins with the puzzle: how did Botswana develop a legalrational state? We suggest that three key interlinked factors were important. First, during the pre-colonial period the Tswana developed local states with relatively limited kingship or chiefship and with a political structure that was able to integrate people of other ethnic groups such as Kalanga. Second, facing the onslaugh...

Frontier malaria is a biological, ecological, and sociodemographic phenomenon operating over time at three spatial scales (micro/individual, community, and state and national). We explicate these linkages by integrating data from remote sensing surveys, ground-level surveys and ethnographic appraisal, focusing on the Machadinho settlement project in Rondônia, Brazil. Spatially explicit analyses...

An observation of the ultraviolet nightglow between 2670/• and 3040/• was conducted over White Sands Missile Range on October 22, 1984, at 0020 hours LST during the Orionids meteor shower. A 1/4-meter uv spectrometer operating at 3.5/• resolution viewed the Earth's limb at tangent heights between 90 km and 110 km for 120 seconds. By inverting the observed limb intensities, a total zenith intens...