Results 171 to 180 of about 82,204 (193)
Some of the next articles are maybe not open access.
A Trophic Level Effect on 137Cs Concentration
Health Physics, 1965Abstract In many animal species, the cesium/potassium ratio in the body is about two to three times higher than the cesium/potassium ratio in their normal diets. Data indicate that this increase ratio is greater with increased potassium intake and is larger in adult humans than in children.
R C, Pendleton +3 more
openaire +2 more sources
Exploitation in Three Trophic Levels
The American Naturalist, 1973The population dynamics of a general three-species, three-trophic-level exploitational system are explored. The conclusions pertaining to three levels are much the same as those for two. Exploitation is defined as one species using another to satisfy its reproductive requirements while the other suffers reproductive depression because of the ...
openaire +1 more source
The decline of the trophic level concept
Trends in Ecology & Evolution, 1987The development of the trophic level concept(1) is described and the causes of its failure as a predictive model in ecology are examined. A defence(2) of and modifications to the trophic level concept are reviewed. A trend towards taxonomic food web analysis is identified leading to models that are independent of the trophic level approach.
openaire +2 more sources