I. Dewenter and E. Ockinger, Dispersal capacity and diet breadth modify the 529 response of wild bees to habitat loss, Proc. Biol. Sci, vol.277, pp.2075-2082, 2010.

L. G. Carvalheiro, C. L. Seymour, R. Veldtman, and S. W. Nicolson, Pollination services 532 decline with distance from natural habitat even in biodiversity-rich areas, J. Appl. Ecol, vol.533, issue.47, 2010.

L. G. Carvalheiro, C. L. Seymour, S. W. Nicolson, and R. Veldtman, Creating patches of 535 native flowers facilitates crop pollination in large agricultural fields: mango as a case, p.548, 2012.

L. Mar-tins, G. Njoroge, and . Tribe, Crops, browse and pollinators in Africa: an 549 initial stock-taking, p.550, 2007.

E. J. Eilers, C. Kremen, S. Smith-greenleaf, A. K. Garber, and A. Klein, Contribution 551 of pollinator-mediated crops to nutrients in the human food supply, PLoS One, vol.6, 2011.

P. R. Ehrlich and J. Harte, Opinion: To feed the world in 2050 will require a global revolution, Proceedings of the National Academy of Sciences, vol.112, issue.48, pp.14743-14744, 2015.
DOI : 10.1073/pnas.1519841112

C. Fontaine, I. Dajoz, J. Meriguet, and M. Loreau, Functional diversity of plant-pollinator 572 interaction webs enhances the persistence of plant communities, PLoS Biol, 2006.

R. Bommarco, Functional identity and diversity of animals predict ecosystem 577 functioning better than species-based indices, p.578, 2015.

N. Gallai, J. Salles, J. Settele, and B. E. Vaissière, Economic valuation of the vulnerability of world agriculture confronted with pollinator decline, Ecological Economics, vol.68, issue.3, pp.810-821, 2008.
DOI : 10.1016/j.ecolecon.2008.06.014

URL : https://hal.archives-ouvertes.fr/halshs-01293686

L. A. Garibaldi, M. A. Aizen, A. M. Klein, S. Cunningham, L. D. Harder et al., Global 583 growth and stability of agricultural yield decrease with pollinator dependence, Proc. I, 2011.

A. M. Klein, Wild pollinators enhance fruit set of crops regardless of honey bee 601 abundance, Science, vol.339, 2013.

C. H. Vergara, B. F. Viana, and M. Woyciechowski, Trait matching of flower visitors 608 and crops predicts fruit set better than trait diversity, J. Appl. Ecol, vol.52, pp.1436-1444, 2015.

B. Geslin, V. Le-féon, M. Kuhlmann, B. E. Vaissière, and I. Dajoz, The bee fauna of 623 large parks in downtown Paris, p.624, 2016.

C. Kremen, Bee foraging ranges and their relationship to body size, Oecologia, vol.626, pp.153-589, 2007.

D. Goulson, E. Nicholls, C. Botias, and E. L. Rotheray, Bee declines driven by combined 628 stress from parasites, pesticides, and lack of flowers, Science, vol.80, issue.347, pp.1255957-629, 2015.

C. E. Grueber, S. Nakagawa, R. J. Laws, and I. G. Jamieson, Multimodel inference in ecology and evolution: challenges and solutions, Journal of Evolutionary Biology, vol.1, issue.4, pp.699-711, 2011.
DOI : 10.1111/j.1420-9101.2010.02210.x

A. Klein, B. E. Vaissière, J. H. Cane, I. Steffan-dewenter, S. A. Cunningham et al., Importance of pollinators in changing landscapes for world crops, Proceedings of the Royal Society B: Biological Sciences, vol.72, issue.5, pp.303-133721, 2006.
DOI : 10.1126/science.265.5176.1170

C. Kremen and L. K. M-'gonigle, Small-scale restoration in intensive agricultural 672 landscapes supports more specialized and less mobile pollinator species, J. Appl. Ecol, p.673, 2015.

C. Kremen, N. M. Williams, and R. W. Thorp, Crop pollination from native bees at risk from agricultural intensification, Proceedings of the National Academy of Sciences, vol.99, issue.26, pp.16812-16816, 2002.
DOI : 10.1073/pnas.262413599

E. Laliberté and . P. Legendre, A distance-based framework for measuring functional diversity from multiple traits, Ecology, vol.118, issue.1, pp.299-305, 2010.
DOI : 10.1111/j.1461-0248.2005.00850.x

L. A. Morandin and C. Kremen, Hedgerow restoration promotes pollinator populations and exports native bees to adjacent fields, Ecological Applications, vol.23, issue.4, pp.829-839, 2013.
DOI : 10.1016/j.ecolecon.2007.02.024

L. Mucina and M. C. Rutherford, The vegetation of South Africa, p.697, 2006.

J. C. Biesmeijer, R. Bommarco, W. E. Kunin, T. Tscheulin, E. Lamborn et al., Assessing bee species richness in two Mediterranean communities: Importance of 702 habitat type and sampling techniques, Ecol. Res, vol.26, pp.969-983, 2011.

K. A. Orford, P. J. Murray, I. P. Vaughan, and J. Memmott, Modest enhancements to 717 conventional grassland diversity improve the provision of pollination services, J, 2016.

. Ecol, Online Only doi:10, 1111.

T. J. Popic, Y. C. Davila, and G. M. Wardle, Evaluation of common methods for sampling 720 invertebrate pollinator assemblages: net sampling out-perform pan traps, PLoS One, vol.8, 2013.

R. Development and C. Team, R: A language and environment for statistical computing. 723 R Foundation for Statistical Computing, 2014.

R. Rader, I. Bartomeus, J. M. Tylianakis, and E. Laliberté, The winners and losers of land use intensification: pollinator community disassembly is non-random and alters functional diversity, Diversity and Distributions, vol.42, issue.8, pp.908-917, 2014.
DOI : 10.1111/ddi.12221

P. Schmid-hempel, A. Kacelnik, and A. I. Houston, Honeybees maximize efficiency by not filling their crop, Behavioral Ecology and Sociobiology, vol.141, issue.1, pp.61-66, 1985.
DOI : 10.1007/BF00299430

P. Schmid-hempel and R. Schmid-hempel, Nectar-collecting bees use Distance-sensitive movement rules, Animal Behaviour, vol.34, issue.2, pp.605-60710, 1986.
DOI : 10.1016/S0003-3472(86)80131-2

M. Stang, P. G. Klinkhamer, N. M. Waser, I. Stang, and E. Van-der-meijden, Size- 748 specific interaction patterns and size matching in a plant-pollinator interaction web, 2009.

M. Stang, P. G. Klinkhamer, E. J. Van-der-meijden, A. M. Klein, and T. Tscharntke, Size constraints and flower 751 abundance determine the number of interactions in a plant-flower visitor web Spatiotemporal variation in the diversity 767 of hymenoptera across a tropical habitat gradient, Oikos Ecology, vol.752, issue.86, pp.111-121, 2005.

A. J. Vanbergen and P. Initiative, Threats to an ecosystem service: pressures on pollinators, Frontiers in Ecology and the Environment, vol.11, issue.5, pp.251-259, 2013.
DOI : 10.1073/pnas.0501860102

D. P. Vázquez, W. F. Morris, and P. Jordano, Interaction frequency as a surrogate for the 772 total effect of animal mutualists on plants, Ecol. Lett, vol.8, 2005.

C. Westphal, I. Steffan-dewenter, and T. Tscharntke, Mass flowering crops enhance pollinator densities at a landscape scale, Ecology Letters, vol.80, issue.11, pp.961-965, 2003.
DOI : 10.1046/j.1461-0248.2003.00523.x

R. Winfree, Pollinator-Dependent Crops: An Increasingly Risky Business, Current Biology, vol.18, issue.20, pp.10-1890, 2008.
DOI : 10.1016/j.cub.2008.09.010

J. S. Wilson, T. Griswold, and O. J. Messinger, Sampling Bee Communities 791 (Hymenoptera : Apiformes) in a Desert Landscape : Are Pan Traps Sufficient ?, J. Kansas, vol.792, 2008.

S. Wood, D. S. Karp, F. Declerck, C. Kremen, S. Naeem et al., Functional 794 traits in agriculture: agrobiodiversity and ecosystem services, Trends Ecol. Evol, vol.30, pp.795-531, 2015.

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