Mostrar el registro sencillo del ítem
dc.contributor.author
Kohl, Kevin D.
dc.contributor.author
Brzek, Pawel
dc.contributor.author
Caviedes Vidal, Enrique Juan Raul
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.contributor.author
Karasov, William H.
dc.date.available
2017-03-31T19:19:06Z
dc.date.issued
2011-03
dc.identifier.citation
Kohl, Kevin D.; Brzek, Pawel; Caviedes Vidal, Enrique Juan Raul; Karasov, William H.; Pancreatic and intestinal carbohydrases are matched to dietary starch level in wild passerine birds; University of Chicago Press; Physiological and Biochemical Zoology; 84; 2; 3-2011; 195-203
dc.identifier.issn
1522-2152
dc.identifier.issn
1537-5293
dc.identifier.uri
http://hdl.handle.net/11336/14628
dc.description.abstract
Evolutionary shifts in diet composition are presumably accompanied by simultaneous changes in digestive physiology. The adaptive modulation hypothesis predicts that activities of digestive enzymes should match the relative levels of their substrates in an animal’s diet so that available membrane space and synthetic energy are not wasted on enzymes in excess of need. However, previous studies on captive passerine birds showed high intraspecific phenotypic flexibility only in proteases but not in carbohydrases in response to varying diet composition. In this study, we measured the activities of pancreatic, intestinal, and hepatic enzymes in six wild-caught passerine species. We predicted that if the adaptive modulation hypothesis holds during evolutionary shifts in diet composition in birds, then mass-specific activities of digestive enzymes should be correlated positively with the content of their relevant substrates in species’ diets. Whereas mass-specific activities of proteases (aminopeptidase-N, trypsin, chymotrypsin, alanine aminotransferase) were not correlated with estimated dietary protein content, mass-specific activities of all studied carbohydrases (amylase, maltase, sucrase) were positively correlated with estimated dietary starch content. We conclude that activities of carbohydrases but not proteases are evolutionarily matched to diet composition in passerine birds. We hypothesize that the need for nitrogen and essential amino acids can prevent the evolution of a low activity of proteases, even in species feeding on a low-protein diet.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
University of Chicago Press
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Pancreatic Enzymes
dc.subject
Intestinal Enzymes
dc.subject
Dietary Adaptation
dc.subject
Comparative Method
dc.subject
Birds
dc.subject.classification
Zoología, Ornitología, Entomología, Etología
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
Ciencias Biológicas
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.title
Pancreatic and intestinal carbohydrases are matched to dietary starch level in wild passerine birds
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-30T17:42:31Z
dc.journal.volume
84
dc.journal.number
2
dc.journal.pagination
195-203
dc.journal.pais
Estados Unidos
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.journal.ciudad
Chicago
dc.description.fil
Fil: Kohl, Kevin D.. University of Wisconsin; Estados Unidos. University of Utah; Estados Unidos
dc.description.fil
Fil: Brzek, Pawel. University of Wisconsin; Estados Unidos. University of Bialystok. Department of Biology; Polonia
dc.description.fil
Fil: Caviedes Vidal, Enrique Juan Raul. Universidad Nacional de San Luis. Facultad de Quimica, Bioquimica y Farmacia. Departamento de Bioquímica y Ciencias Biológicas; Argentina. Universidad Nacional de San Luis. Facultad de Ciencias Humanas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina
dc.description.fil
Fil: Karasov, William H.. University of Wisconsin; Estados Unidos
dc.journal.title
Physiological and Biochemical Zoology
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.jstor.org/stable/10.1086/658146
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1086/658146
Archivos asociados