Effects of agriculture expansion and intensification on the vertebrate and invertebrate diversity in the Pampas of Argentina

In this paper we summarize for the first time the effects of agriculture expansion and intensification on animal diversity in the Pampas of Argentina and discuss research needs for biodiversity conservation in the area. The Pampas experienced little human intervention until the last decades of the 1...

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Otros Autores: Medan, Diego, Torretta, Juan Pablo, Hodara, Karina, De la Fuente, Elba Beatriz, Montaldo, Norberto Horacio
Formato: Artículo
Lenguaje:Inglés
Materias:
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Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Medan.pdf
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Aporte de:Registro referencial: Solicitar el recurso aquí
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245 0 0 |a Effects of agriculture expansion and intensification on the vertebrate and invertebrate diversity in the Pampas of Argentina 
520 |a In this paper we summarize for the first time the effects of agriculture expansion and intensification on animal diversity in the Pampas of Argentina and discuss research needs for biodiversity conservation in the area. The Pampas experienced little human intervention until the last decades of the 19th century. Agriculture expanded quickly during the 20th century, transforming grasslands into cropland and pasture lands and converting the landscape into a mosaic of natural fragments, agricultural fields, and linear habitats. In the 1980s, agriculture intensification and replacement of cattle grazing-cropping systems by continuous cropping promoted a renewed homogenisation of the most productive areas. Birds and carnivores were more strongly affected than rodents and insects, but responses varied within groups: [a] the geographic ranges and/or abundances of many native species were reduced, including those of carnivores, herbivores, and specialist species [grassland-adapted birds and rodents, and probably specialized pollinators], sometimes leading to regional extinction [birds and large carnivores], [b] other native species were unaffected [birds] or benefited [bird, rodent and possibly generalist pollinator and crop-associated insect species], [c] novel species were introduced, thus increasing species richness of most groups [26 percent of non-rodent mammals, 11. 1 percent of rodents, 6. 2 percent of birds, 0. 8 percent of pollinators]. Much taxonomic and ecological work is still needed to understand Pampean animal biodiversity, to understand how agriculturization is affecting it, and to identify appropriate conservation actions. Networks of Important Bird Areas and Valuable Grassland Areas harbor a balanced representation of Pampean biodiversity and, if adequately protected, may provide valuable research sites, but complementary work should be carried out on agriculturized areas. 
653 0 |a BIRDS 
653 0 |a GRASSLANDS 
653 0 |a INSECTS 
653 0 |a OTHER VERTEBRATES 
653 0 |a POLLINATORS 
653 0 |a RODENTS 
653 0 |a ADAPTATION 
653 0 |a AGRICULTURAL INTENSIFICATION 
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653 0 |a AGRICULTURAL PRACTICE 
653 0 |a BIRD 
653 0 |a CARNIVORE 
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653 0 |a GRASSLAND 
653 0 |a INVERTEBRATE 
653 0 |a NATIVE SPECIES 
653 0 |a RODENT 
653 0 |a SPECIALIZATION 
653 0 |a SPECIES DIVERSITY 
653 0 |a VERTEBRATE 
653 0 |a ARGENTINA 
653 0 |a PAMPAS 
653 0 |a ANIMALIA 
653 0 |a AVES 
653 0 |a BOS 
653 0 |a HEXAPODA 
653 0 |a INVERTEBRATA 
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700 1 |9 13690  |a Montaldo, Norberto Horacio 
773 |t Biodiversity and Conservation  |g vol.20, no.13 (2011), p.3077-3100 
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900 |a In this paper we summarize for the first time the effects of agriculture expansion and intensification on animal diversity in the Pampas of Argentina and discuss research needs for biodiversity conservation in the area. The Pampas experienced little human intervention until the last decades of the 19th century. Agriculture expanded quickly during the 20th century, transforming grasslands into cropland and pasture lands and converting the landscape into a mosaic of natural fragments, agricultural fields, and linear habitats. In the 1980s, agriculture intensification and replacement of cattle grazing-cropping systems by continuous cropping promoted a renewed homogenisation of the most productive areas. Birds and carnivores were more strongly affected than rodents and insects, but responses varied within groups: [a] the geographic ranges and/or abundances of many native species were reduced, including those of carnivores, herbivores, and specialist species [grassland-adapted birds and rodents, and probably specialized pollinators], sometimes leading to regional extinction [birds and large carnivores], [b] other native species were unaffected [birds] or benefited [bird, rodent and possibly generalist pollinator and crop-associated insect species], [c] novel species were introduced, thus increasing species richness of most groups [26 percent of non-rodent mammals, 11. 1 percent of rodents, 6. 2 percent of birds, 0. 8 percent of pollinators]. Much taxonomic and ecological work is still needed to understand Pampean animal biodiversity, to understand how agriculturization is affecting it, and to identify appropriate conservation actions. Networks of Important Bird Areas and Valuable Grassland Areas harbor a balanced representation of Pampean biodiversity and, if adequately protected, may provide valuable research sites, but complementary work should be carried out on agriculturized areas. 
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