Random processes and geographic species richness patterns: Why so few species in the north?

F. Bokma, J. Bokma, M. Monkkonen*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    46 Citations (Scopus)

    Abstract

    In response to the suggestion that the latitudinal gradient in species richness is the result of stochastic processes of species distributions, we created a computer simulation program that enabled us to study random species distributions over irregularly shaped areas. Our model could not explain latitudinal variation in species richness of New World mammals and created species richness patterns that differed dramatically from previous stochastic models. The interplay of speciation and species migration in our simulation generated the highest species richness in the middle of a landmass, not in the middle of its latitudinal stretch as was found in previous one-dimensional models. The discrepancy between the results of this study and previous empirical studies suggests that the effect of randomness in species-richness distribution is on a continental scale restricted by other, dominant determinants that limit the effect of chance.

    Original languageEnglish
    Pages (from-to)43-49
    Number of pages7
    JournalEcography
    Volume24
    Issue number1
    DOIs
    Publication statusPublished - Feb-2001

    Keywords

    • LATITUDINAL GRADIENTS
    • NEW-WORLD
    • DIVERSITY
    • MARSUPIALS
    • MAMMALS
    • BATS

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