An improved procedure for testing the effects of key innovations on rate of speciation

Article Abstract:

The use of Fisher's procedure to test the probability values derived by using a random speciation and extinction model will result in the testing of the null hypothesis. Three randomization testing procedures for the modified null hypothesis are presented with the corresponding estimates of their effectivity. FP proves to be an appropriate method for testing loci compatibility with random mating's null model but is inappropriate when applied to instances of substantial heterozygote deficiency.

Mathematical models, Distribution (Probability theory)

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Body size and consumer-resource dynamics

Article Abstract:

Consumer-resource models and their dynamics based on energetics and allometric empiricism are presented. Categories such as endotherm, vertebrate ectotherm, invertebrate ectotherm and plant were formulated based on metabolism and body sizes. The models provide alternatives to the usual parameter-laden population models in assessing population dynamics, particularly when time and resource constraints allow the gathering of only a minimum of parameters.

Energy metabolism, Allometry, Bioenergetics

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Does body size optimization result in skewed body size distribution on a logarithmic scale?

Article Abstract:

Kozlowski and Weiner's (1997) model for the optimal adult body size is analyzed. This model shows that optimization of body size yields a distribution of sizes on a logarithmic scale within a taxon that is skewed to the right. It is argued that although this finding was based on a limited range of parameters, a very general outcome of body size optimization in the model was achieved.

Research, Body size, Body weights and measures

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