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dc.contributor.author
Ciminari, María Eugenia  
dc.contributor.author
Afik, Daniel  
dc.contributor.author
Karasov, William  
dc.contributor.author
Caviedes Vidal, Enrique Juan Raul  
dc.date.available
2021-07-18T13:22:22Z  
dc.date.issued
2001-10-01  
dc.identifier.citation
Ciminari, María Eugenia; Afik, Daniel; Karasov, William; Caviedes Vidal, Enrique Juan Raul; Is diet-shifting facilitated by modulation of pancreatic enzymes? Test of an adaptational hypothesis in Yellow-rumped Warblers; American Ornithologists' Union; Auk; 118; 4; 1-10-2001; 1101-1107  
dc.identifier.issn
0004-8038  
dc.identifier.uri
http://hdl.handle.net/11336/136381  
dc.description.abstract
Many birds exhibit seasonal switches in diet and thus alter nutrients predominating their food intake. We tested for dietary modulation of pancreatic enzymes in Yellow-rumped Warblers (Dendroica coronata), a species for which such dietary changes are documented. Birds were fed three diets formulated from either fruit, insect, or seed. We predicted that pancreatic carbohydrase amylase, and the proteases trypsin and chymotrypsin, would be modulated in direct correlation with relative levels of dietary carbohydrate and protein, respectively. In contrast to the prediction, there was no significant dietary effect on activities of amylase and chymotrypsin, and a significant change in trypsin activity (highest on seed diet) occurred in the wrong direction with regard to the prediction. Considering the statistical power of our tests, we conclude that Yellow-rumped Warblers represent a case of only modest ability, at best, to modulate pancreatic enzymes. For some diets, especially high-starch diets that they digest relatively poorly and on which they tend to lose body mass, they may lack sufficient enzyme and hence are constrained in their dietary niche.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
American Ornithologists' Union  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Birds  
dc.subject
Diet  
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Pancreatic carbohydrase amylase  
dc.subject.classification
Bioquímica y Biología Molecular  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Is diet-shifting facilitated by modulation of pancreatic enzymes? Test of an adaptational hypothesis in Yellow-rumped Warblers  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2021-02-17T20:12:03Z  
dc.identifier.eissn
1938-4254  
dc.journal.volume
118  
dc.journal.number
4  
dc.journal.pagination
1101-1107  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Ciminari, María Eugenia. Universidad Nacional de San Luis; Argentina  
dc.description.fil
Fil: Afik, Daniel. University of Haifa at Oranim; Israel  
dc.description.fil
Fil: Karasov, William. University of Wisconsin; Estados Unidos  
dc.description.fil
Fil: Caviedes Vidal, Enrique Juan Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina  
dc.journal.title
Auk  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/auk/article/118/4/1101/5561977  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1093/auk/118.4.1101