Coefficient shifts in geographical ecology: An empirical evaluation of spatial and non-spatial regression

L. Mauricio Bini, J. Alexandre F. Diniz-Filho, Thiago F.L.V.B. Rangel, Thomas S.B. Akre, Rafael G. Albaladejo, Fabio S. Albuquerque, Abelardo Aparicio, Miguel B. Araújo, Andrés Baselga, Jan Beck, M. Isabel Bellocq, Katrin Böhning-Gaese, Paulo A.V. Borges, Isabel Castro-Parga, Vun Khen Chey, Steven L. Chown, Paulo De Marco, David S. Dobkin, Dolores Ferrer-Castán, Richard FieldJulieta Filloy, Erica Fleishman, Jose F. Gómez, Joaquín Hortal, John B. Iverson, Jeremy T. Kerr, W. Daniel Kissling, Ian J. Kitching, Jorge L. León-Cortés, Jorge M. Lobo, Daniel Montoya, Ignacio Morales-Castilla, Juan C. Moreno, Thierry Oberdorff, Miguel Á Olalla-Tárraga, Juli G. Pausas, Hong Qian, Carsten Rahbek, Miguel Á Rodríguez, Marta Rueda, Adriana Ruggiero, Paula Sackmann, Nathan J. Sanders, Levi Carina Terribile, Ole R. Vetaas, Bradford A. Hawkins

Research output: Contribution to journalArticlepeer-review

215 Scopus citations

Abstract

A major focus of geographical ecology and macroecology is to understand the causes of spatially structured ecological patterns. However, achieving this understanding can be complicated when using multiple regression, because the relative importance of explanatory variables, as measured by regression coefficients, can shift depending on whether spatially explicit or non-spatial modeling is used. However, the extent to which coefficients may shift and why shifts occur are unclear. Here, we analyze the relationship between environmental predictors and the geographical distribution of species richness, body size, range size and abundance in 97 multi-factorial data sets. Our goal was to compare standardized partial regression coefficients of non-spatial ordinary least squares regressions (i.e. models fitted using ordinary least squares without taking autocorrelation into account; "OLS models" hereafter) and eight spatial methods to evaluate the frequency of coefficient shifts and identify characteristics of data that might predict when shifts are likely. We generated three metrics of coefficient shifts and eight characteristics of the data sets as predictors of shifts. Typical of ecological data, spatial autocorrelation in the residuals of OLS models was found in most data sets. The spatial models varied in the extent to which they minimized residual spatial autocorrelation. Patterns of coefficient shifts also varied among methods and datasets, although the magnitudes of shifts tended to be small in all cases. We were unable to identify strong predictors of shifts, including the levels of autocorrelation in either explanatory variables or model residuals. Thus, changes in coefficients between spatial and non-spatial methods depend on the method used and are largely idiosyncratic, making it difficult to predict when or why shifts occur. We conclude that the ecological importance of regression coefficients cannot be evaluated with confidence irrespective of whether spatially explicit modelling is used or not. Researchers may have little choice but to be more explicit about the uncertainty of models and more cautious in their interpretation.

Original languageEnglish (US)
Pages (from-to)193-204
Number of pages12
JournalEcography
Volume32
Issue number2
DOIs
StatePublished - Apr 2009
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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