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Woody species invasion in the Rolling Pampa grasslands, Argentina


, : Woody species invasion in the Rolling Pampa grasslands, Argentina. Agriculture ecosystems and environment 88(3): 271-278

Information on the geographical distribution of plant invasion has been recorded in detail in some areas of the world; however, in large regions such as South America there are a few, if any, records of the spread of alien plants and invasive species and even less information about their effects on ecosystems at different levels of organization. This study examines the extent to which woody species introduced during the last centuries are invading the Rolling Pampa (which is typical of the entire region of the Argentina pampas) and discusses whether this invasion is related to the species' genetics or to environmental factors. All woody species were surveyed along landscape corridors (highways and intersecting secondary dirt roads and streams), as well as in farmed fields under three different tillage systems: zero tillage in the entire field for all crops in the rotation (where tillage was replaced by a presowing herbicide application), zero tillage for selected crops, and conventional tillage. Landscape corridors along the roads had been invaded by 40 woody species (mostly trees). On the farmed land, fields under the zero tillage farming system were invaded by seven woody species (three tree species and four shrubs). With zero tillage for select crops only, woody species richness was reduced to three (one tree and two shrub species). In the conventional tillage, there were only three invading species, all shrubs. In both the roadside and riparian corridors, the species with the highest constancy values were Gleditsia triacanthos L., Morus alba L., and Melia azedarach L. In both types of zero tillage farmed fields, M. alba was absent, but G. triacanthos and M. azedarach remained the species with the highest constancy values. Both genetic and ecological factors were important determinants for the invasion of the pampas by woody species. The woody invasion process has reached a point at which the pampean grasslands on the better-drained soils will no longer be restored to a grassland biome without human intervention.

US$19.90

DOI: 10.1016/s0167-8809(01)00209-2


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Masliah, E.; Rockenstein, E.; Mante, M.; Crews, L.; Spencer, B.; Adame, A.; Patrick, C.; Trejo, M.; Ubhi, K.; Rohn, T.T.; Mueller-Steiner, S.; Seubert, P.; Barbour, R.; McConlogue, L.; Buttini, M.; Games, D.; Schenk, D., 2011: Passive immunization reduces behavioral and neuropathological deficits in an alpha-synuclein transgenic model of Lewy body disease. Dementia with Lewy bodies (DLB) and Parkinson's Disease (PD) are common causes of motor and cognitive deficits and are associated with the abnormal accumulation of alpha-synuclein (α-syn). This study investigated whether passive immunization...

Zagefka Yannakopulos, P., 1980: Eleven experiences in innovations in decentralization of educational administration and management of local resources. This document is devoted to experiences in the People's Republic of Benin, The Socialist Republic of the Union of Burma, Brazil, Costa Rica, Ecuador, India, Indonesia, Lebanon, The Kingdom of Nepal, the Republic of Sri Lanka, and Thailand. It...

Lampe, J.; Penoyer, D.Aragon.; Hadesty, S.; Bean, A.; Chamberlain, L., 2015: Timing is everything: results to an observational study of mealtime insulin practices. The purpose of this study was to evaluate the timing and practices of blood glucose testing and rapid-acting insulin administration around mealtimes. This study used an observational, descriptive design to assess the time between blood glucose tes...

Koch, J.M.; Mellin, K.B.; Waubke, T.N., 1990: Initial experience with autologous conjunctiva/limbus transplantation in pterygium. The present paper reports on the technique and results of conjunctiva/limbus transplantation in 13 eyes with primary or cicatricial pterygium (12 cases and 1 case, respectively). In all cases the pterygia were located nasally. The operation was pe...

LeFrancois, C., 1984: Fetal alcohol syndrome. Maternal alcohol ingestion: serious consequences for the fetus. Vermont Registered Nurse: 3-5

Wakisaka, Gyoichi, 1962: Clinical observations on the relationship between the electrocardlographic changes and dysproteinemia in various diseases. Japanese Circulation Jour: 864

Korsak, B.; Almeida, G.M.; Rocha, S.; Pereira, C.; Mendes, N.; Osório, H.; Pereira, Pícia.M.R.; Rodrigues, Jão.M.M.; Schneider, R.J.; Sarmento, B.; Tomé, Jão.P.C.; Oliveira, C., 2017: Porphyrin modified trastuzumab improves efficacy of HER2 targeted photodynamic therapy of gastric cancer. Gastric cancer (GC) is the 3rd deadliest cancer worldwide, due to limited treatment options and late diagnosis. Human epidermal growth factor receptor-2 (HER2) is overexpressed in ∼20% of GC cases and anti-HER2 antibody trastuzumab in combinatio...

Thatcher, VE., 1986: The parasitic crustaceans of fishes from the Brazilian Amazon. 16. Amazonicopeus elongatus gen. et sp. nov. (Copepoda: Poecilostomatoida) with the proposal of Amazonicopeidae fam. nov. and remarks on its pathogenicity. The post-metamorphic female of Amazonicopeus elongatus gen. et sp. nov. (Copepoda: Poecilostomatoida) is described and Amazonicopeidae fam. nov. is proposed to contain this parasite. The new form was found on the gill arches of Plagioscion squamos...

Zhu, Y.; Chen, H.; Cen, L.; Wang, J., 2015: Influence of abutment tooth position and adhesive point dimension on the rigidity of a dental trauma wire-composite splint. The influence of abutment tooth position and adhesive point dimension on rigidity of wire-composite splints, used in dental trauma, was evaluated in vitro. A commercial artificial resin model was used. The central incisors served as injured teeth...

Gay, E.W.; Smith, M., 1985: Georgian to lead American pediatricians. Journal of the Medical Association of Georgia 74(4): 245-247