TY - JOUR
T1 - Intestinal disaccharides in five species of phyllostomoid bats
AU - Hernandez, A.
AU - Martinez del Rio, C.
N1 - Funding Information:
Acknowledgements--We thank the Centro de Ecologia, Universidad Nacional Autonoma de M6xico, for invaluable logistic support. Our research was funded in part from a National Science Foundation dissertation improvement grant to CMR (BSR-8701048). G. Ceballos helped us in the identification of bats. S. H. Bullock and J. Kummerow provided encouragement and critical advice. J. Sober6n provided a field vehicle and, characteristically, lactose. The staff of the Estaci6n de Biologia Chamela provided assistance and good company. H. Arita, R. Edwards, D. J. Levey, and B. K. McNab read previous versions of the manuscript and provided helpful criticisms and suggestions.
PY - 1992/9
Y1 - 1992/9
N2 - 1. 1. Intestinal disaccharidases were studied in nectarivorous (Leptonycteris curasoae and Glossophaga soricina), frugivorous (Artibeus jamaicensis and Sturnira lilium), and insectivorous (Pteronotus personatus) adult bats. 2. 2. Adult bats lacked measurable lactase activity. With the exception of trehalase activity, which was present only in P. personatus, nectar- and fruit-eating bats exhibited higher disaccharidase activities standardized by intestinal nominal area than insect-eating P. personatus. 3. 3. Maltase and sucrase activities were significantly linearly correlated. 4. 4. Apparent affinity of sucrase varied almost 5-fold among species. This variation may reflect unstirred layer effects resulting from sucrase being a membrane bound enzyme rather than differences in the "true" affinity of sucrase in solution. 5. 5. Passerine birds showed higher maltase activity per unit of sucrase activity than bats and hummingbirds. Maximal sucrase and maltase activities standardized per intestinal nominal area are 1.5-2 times higher in hummingbirds than in nectar-feeding bats.
AB - 1. 1. Intestinal disaccharidases were studied in nectarivorous (Leptonycteris curasoae and Glossophaga soricina), frugivorous (Artibeus jamaicensis and Sturnira lilium), and insectivorous (Pteronotus personatus) adult bats. 2. 2. Adult bats lacked measurable lactase activity. With the exception of trehalase activity, which was present only in P. personatus, nectar- and fruit-eating bats exhibited higher disaccharidase activities standardized by intestinal nominal area than insect-eating P. personatus. 3. 3. Maltase and sucrase activities were significantly linearly correlated. 4. 4. Apparent affinity of sucrase varied almost 5-fold among species. This variation may reflect unstirred layer effects resulting from sucrase being a membrane bound enzyme rather than differences in the "true" affinity of sucrase in solution. 5. 5. Passerine birds showed higher maltase activity per unit of sucrase activity than bats and hummingbirds. Maximal sucrase and maltase activities standardized per intestinal nominal area are 1.5-2 times higher in hummingbirds than in nectar-feeding bats.
UR - http://www.scopus.com/inward/record.url?scp=0026644611&partnerID=8YFLogxK
U2 - 10.1016/0305-0491(92)90420-V
DO - 10.1016/0305-0491(92)90420-V
M3 - Artículo
SN - 0305-0491
VL - 103
SP - 105
EP - 111
JO - Comparative Biochemistry and Physiology -- Part B: Biochemistry and
JF - Comparative Biochemistry and Physiology -- Part B: Biochemistry and
IS - 1
ER -