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|Title: ||Mathematical contributions to link biota with environment|
|Authors: ||Cerdeira, Jorge O.|
Martins, Maria J.
Silva, Pedro C.
Franco, Aldina M.
|Issue Date: ||25-Apr-2014|
|Publisher: ||Journal of Vegetation Science|
|Abstract: ||Hutchinson's pioneering work on the niche concept, dating from 1957, inspired the development of many ecological models. The first proposals, BIOCLIM and HABITAT , were simple geometric approximations to the shape of the niche. Despite their simplicity, they combine two features that make them adequate for the purpose of exploring the niche: they fit a predefined shape to the empirical data; and produce binary or ordinal predictions rather than continuous predictions. Thus, both explicitly delineate a precise boundary for the niche. However, the two methods present some limitations: BIOCLIM assumes that the variables are independent in their action on the species; and HABITAT , although not having that limitation, only delineates the boundaries of the niches without distinguishing levels of suitability for the species. We propose, discuss and illustrate: (1) the use of depth functions to identify regions with distinct suitability inside the niche; and (2) a general framework to assess overlap of the niches of two species, which can be applied to predictions from models that decompose the niche into a finite number of measurable regions.|
|Appears in Collections:||CIBIO-UE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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