Effects of animal husbandry on secondary production and trophic efficiency at a regional scale

Agricultural systems are expected to have higher net secondary production [NSP] than natural systems as a result of higher trophic efficiency and lower interannual variability. These differences, however, have not been quantified across regional gradients. We compiled a dataset of herbivore biomass,...

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Detalles Bibliográficos
Otros Autores: Irisarri, Jorge Gonzalo Nicolás, Oesterheld, Martín, Golluscio, Rodolfo Angel, Paruelo, José María
Formato: Artículo
Lenguaje:Inglés
Materias:
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2014irisarri.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
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245 1 0 |a Effects of animal husbandry on secondary production and trophic efficiency at a regional scale 
520 |a Agricultural systems are expected to have higher net secondary production [NSP] than natural systems as a result of higher trophic efficiency and lower interannual variability. These differences, however, have not been quantified across regional gradients. We compiled a dataset of herbivore biomass, consumption, NSP, annual precipitation, and aboveground net primary production [ANPP] for extensive livestock farms across a wide precipitation gradient in Argentina. We compared these data with worldwide published studies of natural systems. In a double-logarithmic scale, NSP of agricultural systems increased with ANPP from semiarid to subhumid systems and decreased from subhumid to humid systems, a response that contrasted with the linear positive increase of natural systems. Compared to natural systems dominated by homeotherms, Etroph [NSP:ANPP] in agricultural systems in semiarid areas was 8 times higher, due to a 2 times higher Econsump [Consumption:ANPP] and a 4 times higher Eprod [NSP:Consumption]. In subhumid areas, Etroph was 46 times higher, due to a 13.7 times higher Econsump and a 3.3 times higher Eprod. In humid areas, Etroph was 5 times higher, due to a 2.5 times higher Econsump and a 2 times higher Eprod. The interannual variation of herbivore biomass, a major determinant of NSP, was 60 per cent lower in agricultural than in natural systems dominated by homeotherms, and was decoupled from the variability of precipitation. Agricultural systems reach higher NSP by [1] diverting a major proportion of ANPP from the detritus to the grazing chain, [2] converting more efficiently consumption into NSP, and [3] stabilizing herbivore biomass across years. 
653 0 |a ABOVEGROUND NET PRIMARY PRODUCTION 
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653 0 |a POIKILOTHERM 
653 0 |a HOMEOTHERM 
653 0 |a INTERANNUAL VARIATION 
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700 1 |9 12998  |a Irisarri, Jorge Gonzalo Nicolás 
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700 1 |9 729  |a Golluscio, Rodolfo Angel 
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773 |t Ecosystems  |g Vol.17, no.4 (2014), p.738-749, grafs., tbls. 
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900 |a ^tEffects of animal husbandry on secondary production and trophic efficiency at a regional scale 
900 |a ^aIrisarri^bJ. G. N. 
900 |a ^aOesterheld^bM. 
900 |a ^aGolluscio^bR. A. 
900 |a ^aParuelo^bJ. M. 
900 |a ^aIrisarri^bJ. Gonzalo N. 
900 |a ^aOesterheld^bMartín 
900 |a ^aGolluscio^bRodolfo Angel 
900 |a ^aParuelo^bJosé María 
900 |a ^aIrisarri^bJ. Gonzalo N.^tIFEVA-Faculty of Agronomy, University of Buenos Aires-CONICET, Av. San Martín 4453, C.P:1417 Buenos Aires, Argentina- E-mail: irisarri@agro.uba.ar 
900 |a ^aOesterheld^bMartín^tIFEVA-Faculty of Agronomy, University of Buenos Aires-CONICET, Av. San Martín 4453, C.P:1417 Buenos Aires, Argentina 
900 |a ^aGolluscio^bRodolfo Angel^tIFEVA-Faculty of Agronomy, University of Buenos Aires-CONICET, Av. San Martín 4453, C.P:1417 Buenos Aires, Argentina 
900 |a ^aParuelo^bJosé María^tIFEVA-Faculty of Agronomy, University of Buenos Aires-CONICET, Av. San Martín 4453, C.P:1417 Buenos Aires, Argentina 
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900 |a ^igrafs., tbls. 
900 |a Vol.17, no.4 (2014) 
900 |a 749 
900 |a ABOVEGROUND NET PRIMARY PRODUCTION 
900 |a HERBIVORES 
900 |a POIKILOTHERM 
900 |a HOMEOTHERM 
900 |a INTERANNUAL VARIATION 
900 |a CONSUMPTION 
900 |a Agricultural systems are expected to have higher net secondary production [NSP] than natural systems as a result of higher trophic efficiency and lower interannual variability. 
900 |a These differences, however, have not been quantified across regional gradients. 
900 |a We compiled a dataset of herbivore biomass, consumption, NSP, annual precipitation, and aboveground net primary production [ANPP] for extensive livestock farms across a wide precipitation gradient in Argentina. 
900 |a We compared these data with worldwide published studies of natural systems. In a double-logarithmic scale, NSP of agricultural systems increased with ANPP from semiarid to subhumid systems and decreased from subhumid to humid systems, a response that contrasted with the linear positive increase of natural systems. 
900 |a Compared to natural systems dominated by homeotherms, Etroph [NSP:ANPP] in agricultural systems in semiarid areas was 8 times higher, due to a 2 
900 |a times higher Econsump [Consumption:ANPP] and a 4 times higher Eprod [NSP:Consumption]. 
900 |a In subhumid areas, Etroph was 46 times higher, due to a 13.7 times higher Econsump and a 3.3 times higher Eprod. 
900 |a In humid areas, Etroph was 5 times higher, due to a 2.5 times higher Econsump and a 2 times higher Eprod. 
900 |a The interannual variation of herbivore biomass, a major determinant of NSP, was 60 per cent lower in agricultural than in natural systems dominated by 
900 |a homeotherms, and was decoupled from the variability of precipitation. 
900 |a Agricultural systems reach higher NSP by [1] diverting a major proportion of ANPP from the detritus to the grazing chain, [2] converting more efficiently consumption into NSP, and [3] stabilizing herbivore biomass across years. 
900 |a 2014 
900 |a AAG 
900 |a 2014irisarri 
900 |a http://ri.agro.uba.ar/files/intranet/articulo/2014irisarri.pdf 
900 |a https://link.springer.com 
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