Efeito da idade a castração sobre a taxa de crescimento e características de carcaça de caprino Moxotó.
1984
1984
Published in Oecologia
In the context of a study on the dynamics of Sahelian rangelands, seed characteristics of about 30 species have been described, with particular attention to germination characteristics. Data on both form and weight of the seeds are presented. Germination was studied under controlled conditions in a climate room. Optimum conditions for germination w...
1990
1990
Published in Oecologia
In order to understand the vegetation dynamics of Sahelian rangelands, the effects of water availability on germination were investigated under controlled conditions in climate rooms. Mixtures of seeds from species that occur in the same habitats but have different seed characteristics were exposed to different watering treatments. Responses to the...
Some members of the tribe DelphineaeWarming are useful as forage for grazing cattle or as a source of medicaments for man. However, under certain circumstances their consumption results in poisoning, apparently because of norditerpenoid alkaloids. At least 150 diterpenoid alkaloids have been identified in Delphinium. In this report, factors influen...
1995
Published in Plant Ecology
This study demonstrates a vegetation mapping methodology that relates the reflectance information contained in multispectral imagery to traditionally accepted ecological classifications. Key elements of the approach used are (a) the use of cover rather than density or presence/absence to quantify the vegetation, (b) the inclusion of physical compon...
Published in Landscape Ecology
Large-scale patterns of land use and fragmentation have been associatedwith the decline of many imperiled wildlife populations. Lesserprairie-chickens(Tympanuchus pallidicinctus) are restricted to thesouthernGreat Plains of North America, and their population and range have declined by> 90% over the past 100 years. Our objective was to examine scal...
Published in Environmental Management
A simulation model of a cattle ranch based in southern Alberta, Canada was developed to evaluate the on-ranch economics of adopting different grazing management strategies to improve riparian grazing capacity in natural grass rangeland. Under low-cost scenarios, there are positive economic incentives to adopt strategies to maintain riparian zones t...