Latitudinal gradients of species richness: A test of the geographic area hypothesis at two ecological scales

Article Abstract:

The latitudinal gradient of increasing species richness toward tropical areas may be the oldest and most fundamental pattern regarding life on earth and it applies to most taxonomic groups. It is suggested that any environmental factor that affects the number of individuals in an area will increase richness because of random replacement or passive sampling, local extinction or speciation.

Texas, Environmental aspects, Extinction (Biology), Tropics, Zoological specimens, Animal specimens, Tropical climates

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Habitat heterogeneity, species diversity and null models

Article Abstract:

Null models were constructed to test the hypothesis that differentiation diversity between habitat types is greater than that produced by stochastic processes. The findings suggest that an increase in habitat heterogeneity leads to an increase in species diversity.

Habitat (Ecology), Biological diversity, Biodiversity, Habitats

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