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Ecological Implications of Resource Depression
Depression phenomena are familiar to most field ecologists but are seldom incorporated into formal ecological theory, so here the possibility of enhancement of availability, as well as competition, is concerned.
Spatial and Temporal Scales in Habitat Selection
Female yellow-headed blackbirds in eastern Washington State settle to nest at higher densities on marshes with higher emergence rates of odonates, the most important prey delivered to nestlings.…
On the Evolution of Mating Systems in Birds and Mammals
- G. Orians
- BiologyAmerican Naturalist
- 1 November 1969
Most cases of polygyny in birds, a group in which monogamy is the most common mating pattern, can be explained on the basis of the model, and those cases not apparently fitting into the predictions are clearly indicated.
Spacing Patterns in Mobile Animals
This review will examine concepts of spacing patterns in mobile animals from the perspective of their proximate causes, their ecological consequences, and their adaptive significance.
Ecology of Australia: the effects of nutrient‐poor soils and intense fires
- G. Orians, A. Milewski
- Environmental ScienceBiological Reviews of The Cambridge Philosophical…
- 1 August 2007
A “Nutrient‐Poverty/Intense‐Fire Theory” is developed, which postulates that most anomalous features of organisms and ecosystems of Australia are the evolutionary consequences of adaptations to nutrient poverty, compounded by intense fire that tends to occur as a result of nutrient poverty.
Some adaptations of marsh-nesting blackbirds.
- G. Orians
- Environmental ScienceMonographs in population biology
- 1 July 1982
The author uses models derived from Darwin's theory of natural selection to predict the behavior and morphology of individuals as well as the statistical properties of their populations, and tests models that predict habitat selection, foraging behavior, territoriality, and mate selection.
Sucessional Status and the Palatability of Plants to Generalized Herbivores
Results of tests indicated that early successional annuals were significantly more palatable than early succession perennials, and no correlation was found between palatability and evolutionary association of the herbivores with the plant species.
A Cost-Income Model of Leaves and Roots with Special Reference to Arid and Semiarid Areas
The model provides a reasonable explanation for the large numbers of desert plants with deciduous, mesophytic leaves and for the great variations reported in R/S ratios in desert plants.
Seed Dispersal by Animals: Contrasts with Pollen Dispersal, Problems of Terminology, and Constraints on Coevolution
There are problems with drawing analogies between the two systems and using terminology derived from studies of pollination to design and interpret studies of seed dispersal.