Intestinal Water Absorption Varies with Expected Dietary Water Load among Bats but Does Not Drive Paracellular Nutrient Absorption

Autor(es)

Price, Edwin R. ^[1] ; Brun, Antonia ^{[2, 3]} ; Gontero-Fourcade, Manuel ^{[2, 3]} ; Fernandez-Marinone, Guido ^{[2, 3]} ; Cruz-Neto, Ariovaldo P. ^[4] ; Karasov, William H. ^[1] ; Caviedes-Vida, Enrique ^{[5, 2, 3]}

Afiliação do(s) autor(es)

^[1] Univ Wisconsin, Dept Forest & Wildlife Ecol, Madison, WI 53706 - USA

^[2] Univ Nacl San Luis, Fac Ciencias Humanas, Lab Biol Prof E Caviedes Codelia, RA-5700 San Luis - Argentina

^[3] Consejo Nacl Invest Cient & Tecn, Lab Biol Integrat, Inst Multidisciplinario Invest Biol San Luis, RA-5700 San Luis - Argentina

^[4] Univ Estadual Paulista, Dept Zool, BR-13506900 Rio Claro, SP - Brazil

^[5] Univ Nacl San Luis, Dept Bioquim & Ciencias Biol, RA-5700 San Luis - Argentina

• Tipo de documento: Artigo Científico
• Fonte: PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY; v. 88, n. 6, p. 680-684, NOV-DEC 2015.
• Citações Web of Science: 2

Resumo

Rapid absorption and elimination of dietary water should he particularly important to flying species and were predicted to vary with the water content of the natural diet. Additionally, high water absorption capacity was predicted to he associated with high paracellular nutrient absorption due to solvent drag. We compared the water absorption rates of sanguivorous, nectarivorous, frugivorous, and insectivorous bats in intestinal lumina! perfusions. High water absorption rates were associated with high expected dietary water load hut were not highly correlated with previously measured rates of (paracellular) arabinose clearance. In conjunction with these tests, we measured water absorption and the paracellular absorption of nutrients in the intestine and stomach of vampire bats using luminal perfusions to test the hypothesis that the unique elongated vampire stomach is a critical site of water absorption. Vampire bats' gastric water absorption was high compared to mice hut not compared to their intestines. We therefore conclude that (1) dietary water content has influenced the evolution of intestinal water absorption capacity in bats, (2) solvent drag is not the only driver of paracellular nutrient absorption, and (3) the vampire stomach (AU)

• Processo FAPESP: 12/04610-5 - Análise comparativa da morfologia do intestino e rotas de absorção de nutrientes entre morcegos e roedores: evidência de convergência adaptativa com aves?
• Beneficiário: Ariovaldo Pereira da Cruz-Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular