Aizen, M. A. & Feinsinger, P. (1994) Habitat fragmentation, native insect pollinators, and feral honey bees in Argentine chaco serrano Ecological Applications, 4, 378-392.

Aizen, M. A. & Harder, L. D. (2009) The global stock of domesticated honey bees is growing slower than agricultural demand for pollination. Current Biology, 19, 915-918.

Biesmeijer, J. C., Roberts, S. P. M., Reemer, M., Ohlemuller, R., Edwards, M., Peeters, T., Schaffers, A. P., Potts, S. G., Kleukers, R., Thomas, C. D., Settele, J. & Kunin, W. E. (2006) Parallel declines in pollinators and insect-pollinated plants in Britain and the Netherlands. Science, 313, 351-354.

Bommarco, R., Lundin, O., Smith, H. G. & Rundlöf, M. (2011) Drastic historic shifts in bumble-bee community composition in Sweden. Proceedings of the Royal Society B: Biological Sciences, 279, 309-315.

Cameron, S. A., Lozier, J. D., Strange, J. P., Koch, J. B., Cordes, N., Solter, L. F. & Griswold, T. L. (2011) Patterns of widespread decline in North American bumble bees. Proceedings of the National Academy of Sciences of the United States of America, 108, 662--667.

Eilers, E. J., Kremen, C., Greenleaf, S. S., Garber, A. K. & Klein, A. M. (2011) Contribution of pollinator-mediated crops to nutrients in the human food supply. Plos One, 6, e21363.

Forister, M. L., McCall, A. C., Sanders, N. J., Fordyce, J. A., Thorne, J. H., O'Brien, J., Waetjen, D. P. & Shapiro, A. M. (2010) Compounded effects of climate change and habitat alteration shift patterns of butterfly diversity. Proceedings of the National Academy of Sciences of the United States of America, 107, 2088-2092.

Free, J. B. (1993) Insect Pollination of Crops. Academic Press, London.

Freitas, B. M., Imperatriz-Fonseca, V. L., Medina, L. M., Kleinert, A. D. P., Galetto, L., Nates-Parra, G. & Quezada-Euan, J. J. G. (2009) Diversity, threats and conservation of native bees in the Neotropics. Apidologie, 40, 332-346.

Gallai, N., Salles, J. M., Settele, J. & Vaissiere, B. E. (2009) Economic valuation of the vulnerability of world agriculture confronted with pollinator decline. Ecological Economics, 68, 810-821.

Garibaldi, L. A., Steffan-Dewenter, I., Kremen, C., Morales, J. M., Bommarco, R., Cunningham , S., Carvalheiro, L., Chacoff, N., Dudenhöffer, J. H., Greenleaf, S., Holzschuh, A., Isaacs, R., Krewenka, K., Mandelik, Y., Mayfield, M., Morandin, L., Potts, S. G., Ricketts, T., Szentgyörgyi, H., Winfree, R. & Klein, A. M. (2011) Stability of pollination services decreases with isolation from natural areas despite honey bee visits Ecology Letters, 14, 1062--1072.

Hoehn, P., Tscharntke, T., Tylianakis, J. M. & Steffan-Dewenter, I. (2008) Functional group diversity of bee pollinators increases crop yield. Proceedings of the Royal Society B-Biological Sciences, 275, 2283-2291.

Jaffe, R., Dietemann, V., Allsopp, M. H., Costa, C., Crewe, R. M., Dall'olio, R., de la Rua, P., El-Niweiri, M. A. A., Fries, I., Kezic, N., Meusel, M. S., Paxton, R. J., Shaibi, T., Stolle, E. & Moritz, R. F. A. (2010) Estimating the density of honeybee colonies across their natural range to fill the gap in pollinator decline censuses. Conservation Biology, 24, 583-593.

Kaiser-Bunbury, C. N., Muff, S., Memmott, J., Muller, C. B. & Caflisch, A. (2010) The robustness of pollination networks to the loss of species and interactions: a quantitative approach incorporating pollinator behaviour. Ecology Letters, 13, 442-452.

Keil, P., Biesmeijer, J. C., Barendregt, A., Reemer, M. & Kunin, W. E. (2011) Biodiversity change is scale-dependent: An example from Dutch and UK hoverflies (Diptera, Syrphidae). Ecography 34, 392-401.

Klein, A. M., Vaissiere, B. E., Cane, J. H., Steffan-Dewenter, I., Cunningham, S. A., Kremen, C. & Tscharntke, T. (2007) Importance of pollinators in changing landscapes for world crops. Proceedings of the Royal Society B-Biological Sciences, 274, 303-313.

Memmott, J., Waser, N. M. & Price, M. V. (2004) Tolerance of pollination networks to species extinctions. Proceedings Of The Royal Society Of London Series B-Biological Sciences, 271, 2605-2611.

Ollerton, J., Winfree, R. & Tarrant, S. (2011) How many flowering plants are pollinated by animals? Oikos, 120, 321-326.

Potts, S. G., Roberts, S. P. M., Dean, R., Marris, G., Brown, M. A., Jones, R., Neumann, P. & Settele, J. (2010) Declines of managed honey bees and beekeepers in Europe. Journal of Apicultural Research, 49, 15-22.

Sala, O. E., Chapin, F. S., Armesto, J. J., Berlow, E., Bloomfield, J., Dirzo, R., Huber-Sanwald, E., Huenneke, L. F., Jackson, R. B., Kinzig, A., Leemans, R., Lodge, D. M., Mooney, H. A., Oesterheld, M., Poff, N. L., Sykes, M. T., Walker, B. H., Walker, M. & Wall, D. H. (2000) Biodiversity - Global biodiversity scenarios for the year 2100. Science, 287, 1770-1774.

vanEngelsdorp, D., Hayes, J., Underwood, R. M., Caron, D. & Pettis, J. (2011) A survey of managed honey bee colony losses in the USA, fall 2009 to winter 2010. Journal of Apicultural Research, 50, 1-10.

Warren, M. S., Hill, J. K., Thomas, J. A., Asher, J., Fox, R., Huntley, B., Roy, D. B., Telfer, M. G., Jeffcoate, S., Harding, P., Jeffcoate, G., Willis, S. G., Greatorex-Davies, J. N., Moss, D. & Thomas, C. D. (2001) Rapid responses of British butterflies to opposing forces of climate and habitat change. Nature, 414, 65-69.

Williams, P. H. & Osborne, J. L. (2009) Bumblebee vulnerability and conservation world-wide. Apidologie, 40, 367-387.