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      Chilling to the bone: Lower temperatures increase vertebrate predation by Tonatia bidens (Chiroptera: Phyllostomidae)

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          ABSTRACT The greater round-eared bat, Tonatia bidens (Spix, 1823), is a medium-sized phyllostomid bat distributed in the north of Argentina, Paraguay and Brazil. The diet and foraging patterns of this species are poorly known. We analyzed the composition of the diet of a population of T. bidens and how the temperature influences the consumption of vertebrates and invertebrates. To describe diet composition, we conducted weekly collections of food scrap from two monospecific night-perches. Data of temperature for the study period were taken from the meteorological station installed 300 m from the collection perches. The influence of temperature was evaluated using generalized linear models (GLMs) with negative binomial distribution. Tonatia bidens consumed 28 taxons (204 records), being at least 17 Artropods and 11 Passeriformes birds. Temperature explained a greater proportion of vertebrate abundance (R2 = 0.23) than invertebrate (R2 = 0.16) or to both pooled (R2 = 0.11). The relation with temperature was positive with invertebrates and negative with the vertebrates. The diet of the population of T. bidens comprised mainly invertebrates, which were the most frequent and diverse taxa. Data suggests that T. bidens has a diverse diet, with proportion of the item’s consumption varying temporally. Environmental factors, such as the temperature presented on this work, seems to be good proxies for the dietary traits of this species.

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          Most cited references 11

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          Sinopse da fauna cavernícola do Brasil (1907-1994)

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            Seasonal variation in the diet of the bat Carollia perspicillata (Chiroptera: Phyllostomidae) in an Atlantic Forest area in southeastern Brazil

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              A Comparison of Tropical and Temperate Aerial Insect Abundance

               C. Hails (1982)

                Author and article information

                Zoologia (Curitiba)
                Zoologia (Curitiba)
                Sociedade Brasileira de Zoologia (Curitiba, PR, Brazil )
                : 37
                Criciúma orgnameUniversidade do Extremo Sul Catarinense orgdiv1Laboratório de Zoologia e Ecologia de Vertebrados Brazil
                Goiânia Goiás orgnameUniversidade Federal de Goiás orgdiv1Programa de Pós-Graduação em Ecologia e Evolução Brazil
                Curitiba Paraná orgnameUniversidade Federal do Paraná orgdiv1Departamento de Zoologia orgdiv2Programa de Pós-Graduação em Zoologia Brazil
                Criciúma orgnameUniversidade do Extremo Sul Catarinense orgdiv1Laboratório de Ecologia de Paisagem e de Vertebrados Brazil
                Manaus Amazonas orgnameInstituto Nacional de Pesquisas da Amazônia orgdiv1Programa de Pós-Graduação em Ecologia Brazil
                Criciúma orgnameUniversidade do Extremo Sul Catarinense orgdiv1Programa de Pós-Graduação em Ciências Ambientais Brazil
                S1984-46702020000100307 S1984-4670(20)03700000307

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