Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus

We tested the role of dietary shifts (from rodents to fruits and to mixed diets) on the nutritional ecology of the culpeo fox Pseudalopex culpaeus, a native canid of South America. We studied the effects of food quality on digestive processes, nutrition, and mass balance, and the implications of die...

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Autores principales:	SILVA,SERGIO I., JAKSIC,FABIÁN M., BOZINOVIC,FRANCISCO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2005
Materias:	nutritional bottleneck fox dietary shift fruit consumption
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200007
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spelling	oai:scielo:S0716-078X20050002000072014-08-12Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeusSILVA,SERGIO I.JAKSIC,FABIÁN M.BOZINOVIC,FRANCISCO nutritional bottleneck fox dietary shift fruit consumption We tested the role of dietary shifts (from rodents to fruits and to mixed diets) on the nutritional ecology of the culpeo fox Pseudalopex culpaeus, a native canid of South America. We studied the effects of food quality on digestive processes, nutrition, and mass balance, and the implications of diet quality for fox survival. We observed at the end of the nutritional trials that body mass differed significantly between the three diet groups (fruits, rats and mixed diets), while percentage of body mass change differed significantly only in the fruit diet treatment. Foxes fed with fruits consumed more food to meet their dietary and metabolic needs. Across diets, dry-matter as well as energy digestibility increased significantly with diet quality. Also, mean retention time was negatively and significantly correlated with dry-matter intake. We put forth that mixed diet may yield higher assimilation efficiencies and hence higher nutrient intakes than those predicted from the ingestion and assimilation of pure diets (i.e,. only rats, only fruits). We hypothesize that during periods of low availability of mammalian prey, a mixed diet should yield a positive energy/mass balance for the fox. We conclude that temporal and spatial variation in nutrient, energy, and water contents of prey available in a given habitat could have an important effect on fox nutrition, energy use, and mass balance. Finally, we postulate that P. culpaeus could not survive on fruits only past seven daysinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.78 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200007en10.4067/S0716-078X2005000200007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	nutritional bottleneck fox dietary shift fruit consumption
spellingShingle	nutritional bottleneck fox dietary shift fruit consumption SILVA,SERGIO I. JAKSIC,FABIÁN M. BOZINOVIC,FRANCISCO Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
description	We tested the role of dietary shifts (from rodents to fruits and to mixed diets) on the nutritional ecology of the culpeo fox Pseudalopex culpaeus, a native canid of South America. We studied the effects of food quality on digestive processes, nutrition, and mass balance, and the implications of diet quality for fox survival. We observed at the end of the nutritional trials that body mass differed significantly between the three diet groups (fruits, rats and mixed diets), while percentage of body mass change differed significantly only in the fruit diet treatment. Foxes fed with fruits consumed more food to meet their dietary and metabolic needs. Across diets, dry-matter as well as energy digestibility increased significantly with diet quality. Also, mean retention time was negatively and significantly correlated with dry-matter intake. We put forth that mixed diet may yield higher assimilation efficiencies and hence higher nutrient intakes than those predicted from the ingestion and assimilation of pure diets (i.e,. only rats, only fruits). We hypothesize that during periods of low availability of mammalian prey, a mixed diet should yield a positive energy/mass balance for the fox. We conclude that temporal and spatial variation in nutrient, energy, and water contents of prey available in a given habitat could have an important effect on fox nutrition, energy use, and mass balance. Finally, we postulate that P. culpaeus could not survive on fruits only past seven days
author	SILVA,SERGIO I. JAKSIC,FABIÁN M. BOZINOVIC,FRANCISCO
author_facet	SILVA,SERGIO I. JAKSIC,FABIÁN M. BOZINOVIC,FRANCISCO
author_sort	SILVA,SERGIO I.
title	Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
title_short	Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
title_full	Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
title_fullStr	Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
title_full_unstemmed	Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus
title_sort	nutritional ecology and digestive response to dietary shift in the large south american fox, pseudalopex culpaeus
publisher	Sociedad de Biología de Chile
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200007
work_keys_str_mv	AT silvasergioi nutritionalecologyanddigestiveresponsetodietaryshiftinthelargesouthamericanfoxpseudalopexculpaeus AT jaksicfabianm nutritionalecologyanddigestiveresponsetodietaryshiftinthelargesouthamericanfoxpseudalopexculpaeus AT bozinovicfrancisco nutritionalecologyanddigestiveresponsetodietaryshiftinthelargesouthamericanfoxpseudalopexculpaeus
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Nutritional ecology and digestive response to dietary shift in the large South American fox, Pseudalopex culpaeus

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