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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".
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]
Hubbell built on earlier neutral models, including Robert MacArthur and E.O. Wilson's theory of island biogeography [1] and Stephen Jay Gould's concepts of symmetry and null models. [ 7 ] An "ecological community" is a group of trophically similar, sympatric species that actually or potentially compete in a local area for the same or similar ...
Insects make up the vast majority of animal species. [14]Chapman, 2005 and 2009 [9] has attempted to compile perhaps the most comprehensive recent statistics on numbers of extant species, drawing on a range of published and unpublished sources, and has come up with a figure of approximately 1.9 million estimated described taxa, as against possibly a total of between 11 and 12 million ...
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 ...
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.
Two global information systems are either dedicated to, or have strong focus on, biogeography (in the form of the spatial location of observations of organisms), namely the Global Biodiversity Information Facility (GBIF: 2.57 billion species occurrence records reported as at August 2023) [29] and, for marine species only, the Ocean Biodiversity ...
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: