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BIOTROPICA 40(1): 132135 2008 10.1111/j.1744-7429.2007.00319.x Sex and Season Affect Individual-Level Diet Variation in the Neotropical Marsupial
 

Summary: BIOTROPICA 40(1): 132­135 2008 10.1111/j.1744-7429.2007.00319.x
Sex and Season Affect Individual-Level Diet Variation in the Neotropical Marsupial
Gracilinanus microtarsus (Didelphidae)
Eduardo Guimar~aes Martins,1 M´arcio Silva Ara´ujo
Programa de P´os-graduac¸ ~ao em Ecologia, Instituto de Biologia, Universidade Estadual de Campinas, CP 6109, 13083-970, Campinas,
S~ao Paulo, Brazil
Vin´icius Bonato
Instituto de Ci^encias Biol´ogicas, Centro Regional Universit´ario Esp´irito Santo do Pinhal, Avenida H´elio Vergueiro Leite, 13990-000, Esp´irito
Santo do Pinhal, S~ao Paulo, Brazil
and
S´ergio Furtado dos Reis
Departamento de Parasitologia, Instituto de Biologia, Universidade Estadual de Campinas, CP 6109, 13083-970, Campinas, S~ao Paulo, Brazil
ABSTRACT
Individual-level diet variation was investigated in Gracilinanus microtarsus, an insectivorous marsupial whose diet is affected by sex and season in the highly seasonal
Brazilian Cerrado. To measure individual-level diet variation, the diets of individual males and females were compared to that of their population in the warm-wet and
cool-dry seasons using the proportional similarity index (PSi). This index varies from 1 (complete overlap between the individual i 's and population's diets) toward
0 (decreasing overlap). Mean PSi values were computed as a measure of the degree of interindividual diet variation (the larger the mean PSi value, the smaller the
variation among individuals' diets). Interindividual diet variation among females was similar between seasons, whereas among males it decreased from the warm-wet
to the cool-dry season. Diet variation among males is probably reduced in the cool-dry season because of constraints on food consumption generated by interactions
between endogenous (physiological needs associated with high rates of body mass growth) and exogenous (food limitation) factors.

  

Source: Araújo, Márcio S. - Marine Sciences Program, Department of Biological Sciences, Florida International University

 

Collections: Environmental Sciences and Ecology; Biology and Medicine