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The models allow for interpolation between a limited number of species occurrences. For these models to be effective, it is required to gather observations not only of species presences, but also of absences, that is, where the species does not live.
The GLOBIO Model is a global biodiversity model developed by the Netherlands Environmental Assessment Agency to support policy makers by quantifying global human impacts on biodiversity and ecosystems. [1] [2] [3] It is designed to quantify human impacts on biodiversity at large (regional to global) scales. [4]
Shown in a museum, various models of species across various taxa and orders visualize the variety of life on earth. Biologists most often define biodiversity as the "totality of genes, species and ecosystems of a region".
A structural diagram of the open ocean plankton ecosystem model of Fasham, Ducklow & McKelvie (1990). [1]An ecosystem model is an abstract, usually mathematical, representation of an ecological system (ranging in scale from an individual population, to an ecological community, or even an entire biome), which is studied to better understand the real system.
The model then uses birth, death, immigration, extinction and speciation to modify community composition over time. Hubbell's theta. The UNTB model produces a dimensionless "fundamental biodiversity" number, θ, which is derived using the formula: θ = 2J m v. where:
As in most other sciences, mathematical models form the foundation of modern ecological theory. Phenomenological models: distill the functional and distributional shapes from observed patterns in the data, or researchers decide on functions and distribution that are flexible enough to match the patterns they or others (field or experimental ecologists) have found in the field or through ...
Other types of models may be used to forecast (or hindcast) biodiversity over evolutionary time scales. Palaeobiology modeling uses fossil and phylogenetic evidence of biodiversity in the past to project the trajectory of biodiversity in the future. Simple plots can be constructed and then adjusted based on the varying quality of the fossil record.
Depending on the reliability of the source data and the nature of the models employed (including the scales for which data are available), maps generated from such models may then provide better representations of the "real" biogeographic distributions of either individual species, groups of species, or biodiversity as a whole, however it ...