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dc.contributor.author
Brzek, Pawel
dc.contributor.author
Kohl, Kevin D.
dc.contributor.author
Caviedes Vidal, Enrique Juan Raul
dc.contributor.author
Karasov, William H.
dc.date.available
2016-02-23T16:14:45Z
dc.date.issued
2013-06
dc.identifier.citation
Brzek, Pawel; Kohl, Kevin D.; Caviedes Vidal, Enrique Juan Raul; Karasov, William H.; Activity of intestinal carbohydrases responds to multiple dietary signals in nestling House sparrows; Company of Biologists; Journal of Experimental Biology; 216; 6-2013; 3981-3987
dc.identifier.issn
0022-0949
dc.identifier.uri
http://hdl.handle.net/11336/4396
dc.description.abstract
The ‘adaptive modulation hypothesis’ predicts that activity of digestive enzymes should match the amount of their substrates in diet. Interestingly, many passerine birds do not adjust the activity of intestinal carbohydrases to dietary carbohydrate content. It is difficult to assess the generality of this rule, because in some studies passerines fed on low-carbohydrate and high-lipid diet showed reduced activity of intestinal carbohydrases. However, as carbohydrase activity may be inhibited by high dietary lipid content, it is unclear whether observed effects reflected lack of induction by the low carbohydrate levels or suppression by the high lipid levels. Here, we isolated the specific effects of dietary carbohydrate and lipid on carbohydrases. We hand-fed house sparrow nestlings on diets with 25% starch and 8% lipid (diet HS), no starch and 20% lipid (HL), or 25% starch and 20% lipid (HSL). Our results show that activity of intestinal carbohydrases is simultaneously induced by dietary carbohydrates and decreased by dietary lipid, although the latter effect seems stronger. Activities of maltase and sucrase summed over the total intestine decreased in the order HS>HSL>HL. We observed a complex interaction between diet composition and intestinal position for mass-specific activity of these enzymes, suggesting site-specific responses to changes in digesta composition along the intestines caused by digestion and absorption. We re-interpret results of earlier studies and conclude that there is no unequivocal example of adaptive modulation of intestinal carbohydrases by dietary carbohydrate in adult passerine birds, whereas the present experiment confirms that nestlings of at least some species possess such capacity.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Company of Biologists
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Phenotypic Flexibility
dc.subject
Digestive Enzymes
dc.subject
House Sparrows
dc.subject
Ontogeny
dc.subject.classification
Biología del Desarrollo
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Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Activity of intestinal carbohydrases responds to multiple dietary signals in nestling House sparrows
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
216
dc.journal.pagination
3981-3987
dc.journal.pais
Reino Unido
dc.journal.ciudad
Cambridge
dc.description.fil
Fil: Brzek, Pawel. University of Wisconsin. Department of Forest and Wildlife Ecology; Estados Unidos
dc.description.fil
Fil: Kohl, Kevin D.. University of Wisconsin. Department of Forest and Wildlife Ecology; Estados Unidos
dc.description.fil
Fil: Caviedes Vidal, Enrique Juan Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina. University of Wisconsin. Department of Forest and Wildlife Ecology; Estados Unidos. Universidad Nacional de San Luis. Facultad de Ciencias Humanas. Laboratorio de Biología "Profesor Enrique Cavides Codelia"; Argentina
dc.description.fil
Fil: Karasov, William H.. University of Wisconsin. Department of Forest and Wildlife Ecology; Estados Unidos
dc.journal.title
Journal of Experimental Biology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://jeb.biologists.org/content/216/21/3981
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/doi:10.1242/jeb.086041
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/issn/0022-0949
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