Examlex
Use the following abstract from Theoretical Population Biology to answer the corresponding questions) .
Abstract:
We derive measures for assessing the value of an individual habitat fragment for the dynamics and persistence of a metapopu living in a network of many fragments. We demonstrate that the most appropriate measure of fragment value depends on the question asked. Specifically, we analyse four alternative measures: the contribution of a fragment to the metapopulation capa the network, to the equilibrium metapopulation size, to the expected time to metapopulation extinction and the long- term contribution of a fragment to colonization events in the network. The latter measure is comparable to density- dependent measures in general matrix population theory, though some differences are introduced by the fact that "density dependence" is spatially localized in the metapopulation context. We show that the value of a fragment depends not only on the properties of the landscape but also on the properties of the species. Most importantly, variation in fragment values between the habitat fragments is greatest in the case of rare species that occur close to the extinction threshold, as these species are likely to be restricted to the most favorable parts of the landscape. We expect that the measures of habitat fragment described and analysed here have applications in landscape ecology and in conservation biology.
-One measure for the value of the patch was given by the long- term contribution of a fragment to colonization events in the network. How do the properties of a landscape and the properties of a species affect the value of a patch?
Disadvantaged Populations
Groups of people who face greater obstacles to health, education, and economic opportunity due to social, economic, or environmental disadvantages.
Validity
The degree to which a test or measurement accurately reflects or assesses the specific concept that it is intended to measure.
Reliability
The degree to which an assessment tool or measurement produces stable and consistent results over repeated applications or observations.
Probability Sample
A sampling method in which every member of the population has a known and non-zero chance of being selected.
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