Data/hora: 05/06/2024 17:12:39

Provedor de dados: | 57
País: | Brazil
Título: | A new study method of microhabitat structure of small mammals
Autores: | CERQUEIRA,R.; FREITAS,S. R.
Data: | 1999-05-01
Ano: | 1999
Palavras-chave: | Discriminant analysis; Methods; Niche; Neotropics; Small mammals.
Resumo: | The variables in habitat studies are usually transformed in such a way that they become abstractions and intuition is lost. We tested a new method for the analysis of habitat using data collected in a grid laid at the "restinga de Maricá", in Rio de Janeiro State, Brazil. Thirty-seven microhabitat variables were measured at each trap station. We assume that these variables characterize the microhabitat structure at the moment when measurements were taken. The data are transformed in 3 ways: (1) the averages of the measured variables were calculated, as usual in habitat studies; (2) the data are transformed in densities per area in square meters without reduction in the number of variables; and (3) we calculated the natural logarithms of the data thus transformed. The 3 sets were analised through discriminant analysis. The logarithms of densities were the most efficient kind of transformation. This transformation resulted in a significance of p = 0.0001 with 39.72% of variance in the 1st discriminant function and of p = 0.0426 with 31.45% of variance in the 2nd function, and 84.62% of groups correctly classified. We obtained better classification results than previous similar works and we kept the intuition through the data analysis.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200006
Editor: | Instituto Internacional de Ecologia
Relação: | 10.1590/S0034-71081999000200006
Formato: | text/html
Fonte: | Revista Brasileira de Biologia  v.59 n.2 1999
Fonte: | info:eu-repo/semantics/openAccess