Efeito da idade a castração sobre a taxa de crescimento e características de carcaça de caprino Moxotó.
1984
Germination and establishment of Sahelian rangeland species : I. Seed properties.
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...
Efeito da adubação fosfatada e da frequência de uso sobre a produção de fitomassa do estrato herbáceo.
1990
Efeito da adubação fosfatada sobre a composição florística do estrato herbáceo da caatinga.
1990
Germination and establishment of Sahelian rangeland species : II. Effects of water availability.
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...
Poisonous Properties of Larkspur (Delphinium spp.)
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...
Pastoreio combinado de caprinos com ovinos em caatinga rebaixada: desempenho da pastagem e dos animais.
1995
Numeric classification as an aid to spectral mapping of vegetation communities
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...
Multi-scale effects of habitat loss and fragmentation on lesser prairie-chicken populations of the US Southern Great Pla...
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...
The On-Ranch Economics of Riparian Zone Cattle Grazing Management
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...
