In these species one sees the same basic "deer design" diversified into a large number of ecological niches.
That fits with the theory of "adaptive radiation", which holds the rate at which new species arise is constrained by the number of ecological niches available for them to fill.
Robert Costanza, one of a growing number of "ecological economists," proposed the idea that if oil companies wanted to drill in environmentally sensitive areas, they should be required to post an assurance bond, just as a building contractor often does, large enough to cover the "worst-case damages from their activity".
The final result is an aggregated number of ecological footprint in square metres evaluated with SPI.
Functional differential equations with periodic delays appear in a number of ecological, economical, control and physiological models.
The SPI has, therefore, been applied to a number of ecological assessment tasks, especially for evaluating technologies based on renewable resources [18 20].
Rural landscapes are highly dynamic and their change impacts on a number of ecological processes such as the dynamics of biodiversity.
Marine reserves are an important type of MPA in which no extraction is allowed, but their usefulness depends upon a number of ecological, management, and political factors.
Improvements in transport infrastructures have a positive impact on regional development and significant repercussions on the economy, as well as affecting a large number of ecological processes.
The rapid growth of cities in many parts of the world has stimulated an increasing number of ecological studies of urban environments.
Fragmentation also leads to edge effects, which, when compounded by habitat degradation, may alter the intensity of a number of ecological processes.
