Habitat heterogeneity as a determinant of mammal species richness in high-energy regions

Article Abstract:

The species richness-energy hypothesis has been known as a causative agent for species richness. The hypothesis holds that higher energy availability provides a broader resource base and allows more species to coexist. Based on a study of North American mammals, it was revealed that the species richness-energy hypothesis applies to only over a limited geographical area where climatic energy levels are low, particularly in Alaska and most of Canada. In most of the continental US and southern Canada where energy levels are relatively high, mammal species richness is best dictated by topographic heterogeneity and local variation in energy availability.

Research, Habitat (Ecology), Habitats

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Compartments revealed in food-web structure

Article Abstract:

Compartments increase the stability in networks such as food webs. The two scenarios of disturbance, to develop a hypothesis for testing how compartmentalized interactions increase stability in food webs are explored.

United States

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Variance in ecological consumer-resource interactions

Article Abstract:

Research is presented concerning the use of food-web models which incorporate a variance in trophic interactions in order to study the influence of consumers in empirical studies.

Environmental aspects, Consumers, Letter to the Editor

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