Crop pollination from native bees at risk from agricultural intensification
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...…intensification may disrupt processes such as biological pest control (Andow 1983; Altieri & Letourneau 1984; Corbett & Rosenheim 1996; Thies & Tscharntke 1999; Östman et al. 2001; Symondson et al. 2002) and crop pollination (Kremen et al. 2002, 2004; Klein et al. 2003a,b; Ricketts et al. 2004)....
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...…as a source of (generalist) species invading crop area, enhancing the potential of pollination or biological control (Tscharntke & Kruess 1999; Kremen et al. 2002) and (iii) crop habitat as a source of (generalist) species invading the natural non-crop area, thereby affecting biotic…...
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...…Perfecto et al. 2004; Tylianakis et al. 2004), grassland production (Bullock et al. 2001; Loreau & Hector 2001), pollination (Nabhan & Buchmann 1997; Kremen et al. 2002; Klein et al. 2003a,b) and resistance to plant invasion (Lyons & Schwartz 2001; Kennedy et al. 2002; Levine et al. 2004; Zavaleta…...
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...…bees are of increasing importance), decomposition processes depend on many more organism groups than earthworms and also sustainable pest control needs many enemy species in most cases (Scheu 2001; Steffan-Dewenter & Tscharntke 2000a; Kremen et al. 2002; Mäder et al. 2002; Symondson et al. 2002)....
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