Literaturdatenbank

WIKINDX Resources

Segurado, P. (2007). Occurrence and persistence of freshwater turtles in portugal: Problems of scale and implications for conservation. Unpublished thesis , Universidae de Évora, Évora. 
Added by: Sarina Wunderlich (06 Jul 2014 16:17:20 UTC)
Resource type: Thesis/Dissertation
BibTeX citation key: anon2007.16476
View all bibliographic details
Categories: General
Keywords: Habitat - habitat, Schildkröten - turtles + tortoises, Südwesteuropa - South-Western Europa, Testudinidae, Testudo marginata
Creators: Segurado
Publisher: Universidae de Évora (Évora)
Views: 7/552
Views index: 22%
Popularity index: 5.5%
Abstract     
Correlative modelling approaches have been used as first approximations to infer the role of environmental and biotic factors underlying species occurrences. However correlative models cannot demonstrate unequivocally causal relationships. Furthermore a number of artefacts may cause some inferred relationships to be spurious. In this thesis I focus my work on these sources of uncertainty. First I demonstrate the joint effect of the kind of modelling technique and species macroecological traits in the accuracy of models of species distribution. Then, by means of simulated spatial patterns I assess the overestimation of species distribution models’ accuracy due to spatial autocorrelation. Third, I address the issue of the effect of spatial scale on patterns of species co-occurrence showing that evidences of spatial segregation at finer scales can be inversed at wider scales. In the last part I propose a simple resampling technique to overcome problems derived from sampling artefacts due to species rarity. Emys orbicularis Mauremys leprosa
Added by: Sarina Wunderlich  
wikindx 4.2.2 ©2014 | Total resources: 14930 | Database queries: 52 | Script execution: 0.43701 secs | Style: American Psychological Association (APA) | Bibliography: WIKINDX Master Bibliography