@article{Klein2007,
        title = {Importance of pollinators in changing landscapes for world crops},
        author = {Alexandra-Maria Klein and Bernard E. Vaissière and James H. Cane and Ingolf Steffan-Dewenter and Saul A. Cunningham and Claire Kremen and Teja Tscharntke},
        journal = {Proceedings of the Royal Society B: Biological Sciences},
        month = {February},
        number = 1608,
        pages = {303--313},
        volume = 274,
        year = 2007,
        url = {http://dx.doi.org/10.1098/rspb.2006.3721},
        timestamp = {2008.02.27},
	file = {Klein2007.pdf:Klein2007.pdf:PDF},
	owner = {kej},
	numlit = {00235},
	abstract = {The extent of our reliance on animal pollination for world crop production
	for human food has not previously been evaluated and the previous
	estimates for countries or continents have seldom used primary data.
	In this review, we expand the previous estimates using novel primary
	data from 200 countries and found that fruit, vegetable or seed production
	from 87 of the leading global food crops is dependent upon animal
	pollination, while 28 crops do not rely upon animal pollination.
	However, global production volumes give a contrasting perspective,
	since 60% of global production comes from crops that do not depend
	on animal pollination, 35% from crops that depend on pollinators,
	and 5% are unevaluated. Using all crops traded on the world market
	and setting aside crops that are solely passively self-pollinated,
	wind-pollinated or parthenocarpic, we then evaluated the level of
	dependence on animal-mediated pollination for crops that are directly
	consumed by humans. We found that pollinators are essential for 13
	crops, production is highly pollinator dependent for 30, moderately
	for 27, slightly for 21, unimportant for 7, and is of unknown significance
	for the remaining 9. We further evaluated whether local and landscape-wide
	management for natural pollination services could help to sustain
	crop diversity and production. Case studies for nine crops on four
	continents revealed that agricultural intensification jeopardizes
	wild bee communities and their stabilizing effect on pollination
	services at the landscape scale.},
	biburl = {http://www.bibsonomy.org/bibtex/2b2da2940c466e944c6e35689d9b20857/bioenergyworkshop},
	keywords = {pollen pollinator Nadrowski_K economy crops landscape insects ecosystem_service}
}

@article{kremen2007mobile,
        title = {Pollination and other ecosystem services produced by mobile organisms:
	a conceptual framework for the effects of land-use change.},
        author = {Claire Kremen and Neal M Williams and Marcelo A Aizen and Barbara Gemmill-Herren and Gretchen LeBuhn and Robert Minckley and Laurence Packer and Simon G Potts and T'ai Roulston and Ingolf Steffan-Dewenter and Diego P Vázquez and Rachael Winfree and Laurie Adams and Elizabeth E Crone and Sarah S Greenleaf and Timothy H Keitt and Alexandra-Maria Klein and James Regetz and Taylor H Ricketts},
        journal = {Ecol Lett},
        month = {Apr},
        number = 4,
        pages = {299--314},
        volume = 10,
        year = 2007,
        url = {http://dx.doi.org/10.1111/j.1461-0248.2007.01018.x},
        timestamp = {2007.10.05},
	pii = {ELE1018},
	pmid = {17355569},
	file = {kremen2007mobile.pdf:kremen2007mobile.pdf:PDF},
	owner = {Administrator},
	numlit = {00163},
	doi = {10.1111/j.1461-0248.2007.01018.x},
	abstract = {Many ecosystem services are delivered by organisms that depend on
	habitats that are segregated spatially or temporally from the location
	where services are provided. Management of mobile organisms contributing
	to ecosystem services requires consideration not only of the local
	scale where services are delivered, but also the distribution of
	resources at the landscape scale, and the foraging ranges and dispersal
	movements of the mobile agents. We develop a conceptual model for
	exploring how one such mobile-agent-based ecosystem service (MABES),
	pollination, is affected by land-use change, and then generalize
	the model to other MABES. The model includes interactions and feedbacks
	among policies affecting land use, market forces and the biology
	of the organisms involved. Animal-mediated pollination contributes
	to the production of goods of value to humans such as crops; it also
	bolsters reproduction of wild plants on which other services or service-providing
	organisms depend. About one-third of crop production depends on animal
	pollinators, while 60-90\% of plant species require an animal pollinator.
	The sensitivity of mobile organisms to ecological factors that operate
	across spatial scales makes the services provided by a given community
	of mobile agents highly contextual. Services vary, depending on the
	spatial and temporal distribution of resources surrounding the site,
	and on biotic interactions occurring locally, such as competition
	among pollinators for resources, and among plants for pollinators.
	The value of the resulting goods or services may feed back via market-based
	forces to influence land-use policies, which in turn influence land
	management practices that alter local habitat conditions and landscape
	structure. Developing conceptual models for MABES aids in identifying
	knowledge gaps, determining research priorities, and targeting interventions
	that can be applied in an adaptive management context.},
	biburl = {http://www.bibsonomy.org/bibtex/2c36e9505191c24e3549f5bc0c14dc8d2/bioenergyworkshop},
	keywords = {resources biological_conservation animals ecosystem plants reproduction agricultural models bees pollen Nadrowski_K crops policy public natural_physiology}
}