Definition of the Subject
An understanding of the determinants of biodiversity is an important goal of academic ecology and the protection of biodiversity is an importantgoal in conservation. Biodiversity has two components: the number (or density) of species and the relative abundance of species. Both components vary overdifferent spatial and temporal scales. The allocation of limiting resources to different species in an ecological community is reflected in the abundanceof each species. The notion of a “community” in ecology (as in more general usages of this word) is poorly defined but will here mean thetotal number of organisms found within a fixed area of space (a site). Abundance is measured in different ways but the most exact measure is thetotal mass of living tissues (i. e. biomass) found in a given species at the site. Relative abundance is the proportional abundance of eachspecies relative to the total abundance of all species at the site. The species...
Abbreviations
- Species richness:
-
the number of species per unit area; a synonym is species density.
- Species abundance:
-
the number of individuals or amount of living biomass per species per unit area.
- Per capita instantaneous growth rate:
-
the net number of new individuals produced by an average individual in a population at time t.
- Deterministic chaos:
-
a pattern of change over time that is perfectly determined by initial conditions, but for which tiny changes in initial conditions result is divergences in the dynamics such that the pattern appears random.
- Attractor:
-
a set of values (a point, a curve or higher – including a fractal – dimensional object) towards which a dynamic trajectory will move.
- Basin of attraction:
-
the set of values from which any dynamic trajectory will move towards the same attractor.
- Maximum entropy formalism:
-
a formal method for producing probability estimates that agree with certain constraints specifying available information about a system but that are otherwise maximally uninformative.
- Maximally uninformative (or ignorance) prior:
-
a probability distribution that encodes the basic structure of a logical problem as given by the definition of the variable, but that contains no other information.
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Shipley, B. (2009). Entropy Maximization and Species Abundance. In: Meyers, R. (eds) Encyclopedia of Complexity and Systems Science. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30440-3_174
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