Now showing items 1-3 of 3
Species as historical individuals
(Kluwer Academic Publishers; Springer Science+Business Media, 1990-10)
The species category is defined as the smallest historical individual within which there is a parental pattern of ancestry and descent. The use of historical individual in this definition is consistent with the prevailing ...
An epidemiological model of the corn stunt system in Central America
(Elsevier, 1990)
There is increasing appreciation on the part of ecologists of the crucial role that pathogens may play in the structure of plant populations and communities. This study used classic equations of epidemiology to analyze ...
Mapping freeze/thaw boundaries with SMMR data
(Elsevier, 1990-08)
Nimbus 7 SMMR data are used to map daily freeze/thaw patterns in the upper Midwest for the fall of 1984. The combination of a low 37 GHz radiobrightness and a negative 10.7, 18 and 37 GHz spectral gradient, [part]Tb/[part]f, ...