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Disentangling the role of heat sources on microhabitat selection of two Neotropical lizard species

Published online by Cambridge University Press:  22 April 2019

Zaida Ortega Open the ORCID record for Zaida Ortega [Opens in a new window] ,
Abraham Mencía ,
Kleber Martins ,
Priscilla Soares ,
Vanda Lúcia Ferreira  and
Luiz Gustavo Oliveira-Santos
Zaida Ortega*
Affiliation:
Programa de Pós-Graduação em Ecologia e Conservação, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
Abraham Mencía
Affiliation:
Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
Kleber Martins
Affiliation:
Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
Priscilla Soares
Affiliation:
Programa de Pós-Graduação em Ecologia e Conservação, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
Vanda Lúcia Ferreira
Affiliation:
Instituto de Biociências, Universidade Federal do Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
Luiz Gustavo Oliveira-Santos
Affiliation:
Instituto de Biociências, Universidade Federal do Mato Grosso do Sul, ZIP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
*
*Email: zaidaortega@usal.es
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Abstract

Our aim was to disentangle the effects of different heat sources and the non-thermal properties of the substrate in the microhabitat choices of two lizard species living in savanna habitats of central-western Brazil: the teiid Ameivula aff. ocellifera (N = 43) and the tropidurid Tropidurus oreadicus (N = 23). To this end, a mixed structural resource selection function (mixed-SRSF) approach was used, modelling the probability of finding a lizard on a certain microhabitat based on environmental variables of used and simultaneously available places. First, we controlled for the effects of solar radiation, convection and the physical thermal properties of the substrate on substrate temperature. Then we assessed the effects of solar radiation, convection, conduction and the non-thermal properties of the substrate in the probability of use of a certain microhabitat. Results confirmed that substrate temperature was mediated by: air convection > solar radiation > physical thermal properties of the substrates. Moreover, the mixed-SRSF revealed that direct solar radiation and the non-thermal properties of the substrates were the only drivers of microhabitat selection for both species, with approximately the same strength. Our novel approach allowed splitting of the effect of different mechanisms in the microhabitat selection of lizards, which makes it a powerful tool for assessing the conformation of the interactions between different environmental variables mediating animal behaviour.

Keywords

Brazilconductionconvectionenvironmental temperaturesNeotropical lizardsresource selection functionsavannasolar radiationstructural equation modellingsubstrate
Type
Research Article
Information
Journal of Tropical Ecology , Volume 35 , Issue 4 , July 2019 , pp. 149 - 156
Copyright
© Cambridge University Press 2019 

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