NDLI: Effects of Animal Husbandry on Secondary Production and Trophic Efficiency at a Regional Scale

Content Provider	Springer Nature Link
Author	Irisarri, J. Gonzalo N. Oesterheld, Martín Golluscio, Rodolfo A. Paruelo, José M.
Copyright Year	2014
Abstract	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, E troph (NSP:ANPP) in agricultural systems in semiarid areas was 8 times higher, due to a 2 times higher E consump (Consumption:ANPP) and a 4 times higher E prod (NSP:Consumption). In subhumid areas, E troph was 46 times higher, due to a 13.7 times higher E consump and a 3.3 times higher E prod. In humid areas, E troph was 5 times higher, due to a 2.5 times higher E consump and a 2 times higher E prod. The interannual variation of herbivore biomass, a major determinant of NSP, was 60 % 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.
Starting Page	738
Ending Page	749
Page Count	12
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	17
Issue Number	4
e-ISSN	14350629
Language	English
Publisher	Springer US
Publisher Date	2014-02-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aboveground net primary production herbivores poikilotherm homeotherm interannual variation consumption Ecology Plant Sciences Zoology Environmental Management Geoecology/Natural Processes Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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