Browsing by Author "610219d2-0112-488d-bdd8-c0082780f0fc"
Now showing items 1-20 of 94
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Bozinovic, Francisco; Catalán, Tamara P.; Estay, Sergio A.; Sabat Kirkwood, Alejandro Pablo (2013)Background: Among the predictions of the effect of future climate change, the impact of thermal conditions at local levels on the physiological performance of individuals and their acclimation capacities is key to ...
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Canals Lambarri, Mauricio; Martinez, B. B.; Figueroa, D.; Sabat Kirkwood, Alejandro Pablo (2011)One of the hypotheses that attempt to explain physiological limitations of energy budgets is the symmorphosis hypothesis, which proposes that if matching structures to functional needs were combined with the strict economy ...
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Ramírez Otárola, Natalia; Sabat Kirkwood, Alejandro Pablo (SOC BIOLGIA CHILE, 2011)Digestive capabilities, such as the rates nutrient hydrolysis and absorption, may affect energy intake and ultimately feeding behavior. In birds, a high diversity in gut biochemical capabilities seems to support the existence ...
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Bozinovic, Francisco; Rojas, José M.; Maldonado, Karin; Sabat Kirkwood, Alejandro Pablo; Naya, Daniel (ELSEVIER GMBH, 2010-08-28)The flexibility of digestive traits characterizes a standard model of physiological flexibility, demonstrating that animals adjust their digestive attributes in order to maximize overall energy return. Using an intraspecific ...
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Cortés, Pablo A.; Franco, Marcela; Sabat Kirkwood, Alejandro Pablo; Quijano, Silvia A.; Nespolo, Roberto F. (2011)The microbiotherid marsupial Dromiciops gliroides inhabits the temperate forests of the Southern hemisphere, facing seasonal nutritional and energetic bottlenecks due to its apparently facultative insectivory/frugivory. ...
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Barceló Carvajal, Gonzalo; Salinas Castillo, Jonathan; Sabat Kirkwood, Alejandro Pablo (2012)We studied the renal morphology of 16 species of passerines to assess whether the composition of the diet of birds have been paralleled by differences in the characteristics of the kidneys. We determined the number and ...
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Sabat Kirkwood, Alejandro Pablo; Ramírez Otárola, Natalia; Barceló, Gonzalo; Salinas, Jonathan; Bozinovic, Francisco (ELSEVIER SCIENCE INC, 2010-05-15)The food habit hypothesis (FHH) predicts that mass-independent BMR is associated with dietary traits. In spite of decades of research, the FHH remains controversial, in part because ambiguities surrounding diet categorization ...
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Narváez, Cristóbal; Ramírez Otárola, Natalia; Bozinovic, Francisco; Sánchez Hernández, Juan C.; Sabat Kirkwood, Alejandro Pablo (Elsevier, 2015)Inhibition of blood esterase activities by organophosphate (OP) pesticides has been used as a sensitive biomarker in birds. Furthermore, compared to mammalian vertebrates, less is known about the role of these enzyme ...
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Sabat Kirkwood, Alejandro Pablo; Narváez, Cristóbal; Peña Villalobos, Isaac; Aranda Contreras, Carolina Andrea; Maldonado, Karin; Sánchez Hernández, Juan C.; Newsome, Seth D.; Nespolo, Roberto; Bozinovic, Francisco (Frontiers media SA, 2017)Many physiological adjustments occur in response to salt intake in several marine taxa, which manifest at different scales from changes in the concentration of individual molecules to physical traits of whole organisms. ...
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Sabat Kirkwood, Alejandro Pablo; Maldonado, Karin; Rivera Hutinel, Antonio; Farfán, Gonzalo (SPRINGER, 2004-07)We investigated the phenotypic plasticity of renal function in three South American coastal passerine Cinclodes (ovenbirds) differing in the proportion of marine prey they consume. Individuals were acclimated to two regimes ...
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Sabat Kirkwood, Alejandro Pablo; Maldonado, Karin; Rivera Hutinel, Antonio; Farfan, Gonzalo (Springer Verlag, 2004)We investigated the phenotypic plasticity of renal function in three South American coastal passerine Cinclodes (ovenbirds) differing in the proportion of marine prey they consume. Individuals were acclimated to two regimes ...
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Peña Villalobos, Isaac; Casanova Maldonado, Ignacio; Lois Silva, Pablo; Palma Alvarado, Verónica; Sabat Kirkwood, Pablo (Nature, 2020)In order to maintain the energy balance, animals often exhibit several physiological adjustments when subjected to a decrease in resource availability. Specifically, some rodents show increases in behavioral activity in ...
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Sabat Kirkwood, Alejandro Pablo; González Vejares, Sandra; Maldonado, Karin (Elsevier, 2009)The urine field osmolality in Zonotrichia capensis along a latitudinal gradient in rainfall and temperature in Chile was examined. We also investigated latitudinal variation in the renal traits that mediate how these birds ...
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Ríos, Juan Manuel; Zarco, Agustín; Mosca Torres, María E.; Sabat Kirkwood, Alejandro Pablo (Universidad de Concepcion, 2014)Botanical composition of the diet of White-tipped Plantcutter Phytotoma rutila in the central Monte desert from Argentina, was determined by microhistological analysis of excreta. In both sexes, the diet was composed by a ...
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Martínez del Río, Carlos; Sabat Kirkwood, Alejandro Pablo; Anderson-Sprecher, Richard; Gonzalez, Sandra P. (2009)By comparing the isotopic composition of tissues deposited at different times, we can identify individuals that shift diets over time and individuals with constant diets. We define an individual as an isotopic specialist ...
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Sabat Kirkwood, Alejandro Pablo; Novoa, Fernando; Bozinovic, Francisco; Martínez del Río, Carlos (University of Chicago Press, 1998)The adaptive modulation hypothesis posits that the expression of digestive proteins should be modulated in response to intake of their respective substrates. A corollary of this hypothesis suggests that dietary flexibility ...
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Naya, Daniel; Ebensperger, Luis A.; Sabat Kirkwood, Alejandro Pablo; Bozinovic, Francisco (UNIV CHICAGO PRESS, 2008-11-01)Lactation is the most energetically demanding period in the life cycle of female mammals, and its effects on digestive flexibility and the size of internal organs have been extensively studied in laboratory mice and ...
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Sabat Kirkwood, Alejandro Pablo; Novoa, F. Fernando; Parada, Mario (American Ornithologist Society, 2001)In vertebrates, enzymatic activity levels in the small intestine are correlated with dietary composition. We examined enzymatic activity levels in juvenile specimens of two flamingo species, Phoenicoparrus andinus and ...
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Sabat Kirkwood, Alejandro Pablo; Gonzalez, Sandra P. (American Ornithologist Society, 2003)Changes in digestive enzyme activity along the intestine may be related to changes in substrate concentration in the intestine. We examined the distribution of digestive enzymes along the intestine in two species of ...
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Meynard, Christine; López-Calleja, M. Victoria; Bozinovic, Francisco; Sabat Kirkwood, Alejandro Pablo (American Ornithologist Society, 1999)We studied the activity of three intestinal membrane-bound digestive enzymes in the Rufous-tailed Plantcutter (Phytotoma rara), one of the smallest species of avian herbivores. We selected the disaccharidases (sucrase and ...