Mineral and Nitrogen Concentrations in Feces of Some Neotropical Bats

Abstract

Concentrations of nitrogen and minerals in individual fecal pellets of Noctilio leporinus directly reflect composition of the fish, crustaceans, beetles, or moths originally consumed. Among Neotropical bats that feed primarily on plant parts (fruits, nectar, pollen, and flowers), animal parts (insects and vertebrates), or both, differences in measured concentrations of nutrients are present in feces. Nitrogen levels are markedly higher and sodium levels are marginally higher in feces of carnivores and omnivores than in frugivores. Calcium levels are higher and potassium levels are lower in feces of bats that primarily consume insects. Total iron levels in feces of frugivorous species are marginally lower than in carnivores or omnivores. Magnesium concentrations seem unrelated to feeding habits. Intake of nitrogen, potassium, and magnesium appears to be adequate for bats of all feeding habits. Periodic deficiencies for calcium exist for insectivorous species and for sodium, and possibly iron, in some frugivorous species.