6 documents found, page 1 of 1
Changes in potential mammal diversity in national parks and their implications ...
Estrada, Alba; Barbosa, A. Márcia; Real, RaimundoObserved species richness (OSR) is a widely used and well-studied biodiversity metric. However, non-observed species in favorable ecosystems are also relevant. Two metrics that include observed and potential species were recently defined: potential biodiversity (hereafter potential species richness—PSR) and geometric mean of favorabilities (GMF). We used these metrics to evaluate the national park network of ma...
Species Distributions, Quantum Theory, and the Enhancement of Biodiversity Meas...
Real, Raimundo; Barbosa, A. Márcia; Bull, Joseph W.Species distributions are typically represented by records of their observed occurrence at a given spatial and temporal scale. Such records are inevitably incomplete and contingent on the spatial-temporal circumstances under which the observations were made. Moreover, organisms may respond differently to similar environmental conditions at different places or moments, so their distribution is, in principle, not...
modEvA: Model Evaluation and Analysis
Barbosa, A. Márcia; Brown, Jennifer; Jiménez-Valverde, Alberto; Real, RaimundoThe modEvA package analyses species distribution models and evaluates their performance. It includes functions for performing variation partitioning, calculating several measures of model discrimination and calibration, optimizing prediction thresholds based on a number of criteria, performing multivariate environmental similarity surface (MESS) analysis, and displaying various analytical plots.
Applying fuzzy logic to comparative distribution modelling: a case study with t...
Barbosa, A. Márcia; Real, RaimundoWe modelled the distributions of two toads (Bufo bufo and Epidalea calamita) in the Iberian Peninsula using the favourability function, which makes predictions directly comparable for different species and allows fuzzy logic operations to relate different models. The fuzzy intersection between individual models, representing favourability for the presence of both species simultaneously, was compared with anothe...
Transferability of environmental favourability models in geographic space: The ...
Barbosa, A. Márcia; Real, Raimundo; Vargas, J. MarioTransferring distribution models between different geographical areas may be problematic, as the performance of models outside their original scope is hard to predict. A modelling procedure is needed that Transferring distribution models between different geographical areas may be problematic, as the performance of models outside their original scope is hard to predict. A modelling procedure is needed that gets...
Conservation biogeography of ecologically interacting species: the case of the ...
Real, Raimundo; Barbosa, A. Márcia; Rodríguez, Alejandro; García, Francisco J.; Vargas, J. Mario; Palomo, L. Javier; Delibes, MiguelAim: To assess overlooked conservation problems of the Iberian lynx by exploring biogeographic relationships with its staple prey, the European rabbit. Location: The Iberian Peninsula. Methods: We modeled environmental favorability for the lynx based on its distribution before 1989, and for the rabbit using distribution data collected primarily after its population crash of 1989. We used the latter as a current...