Natural urine concentrations and composition in neotropical bats

1. 1. Among neotropical bats with subdivided renal medullae, some natural urine samples are equal in concentration to mean maximum calculated levels.2. 2. Natural urine osmotic pressures in frugivorous phyllostomids are less than in other phyllostomids which, in turn, are less than in insectivorous bats.3. 3. Urinary sodium (Na+) concentrations show no difference between frugivorous. insectivorous, and others, but urinary potassium (K+) levels in frugivores are higher than in other bats.4. 4. Natural urine concentrations are primarily related to diet and secondarily to environmental dehydration pressure.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25423/1/0000872.pd