Hello,

I guess you might need to dig in that topic by splitting your question according to taxa. For example, the classification is quite straightforward for bird species, at least in Western countries (the habitat of most bird species being known). This should be available through Birdlife International (http://www.birdlife.org/index.html) but you might need to compute the information by yourself.

For other groups of animals and plants, it might become trickier.

Good luck with that and sorry for not being more helpful

My colleagues have an interesting article that may be helpful:

CABRAL, J. A., ROCHA, A., SANTOS, M., & CRESPÍ, A. L. (2007). A stochastic dynamic methodology (SDM) to facilitate handling simple passerine indicators in the scope of the agri-environmental measures problematics. Ecological Indicators, 34–47.

http://www.sciencedirect.com/science/article/pii/S1470160X0500107X

Today I came across the recently released "State of Nature" report on the current state of nature in the UK. Regarding this question: In this report they regard 508 (33%) out of the total 1562 plant species nationally monitored as farmland plants. 45 out of 217 vertebrates (22%) are regarded as farmland species. Among invertebrates the numbers are even higher; 511 out of 1028 (49%) species monitored are regarded as farmland species. Ultimately this leads to a total of 1064 species regarded as farmland species out of a total of 2817 species. So, 37% of all monitored species (Vertebrates, invertebrates and plants) in Britain are regarded as farmland species.

http://www.rspb.org.uk/ourwork/science/stateofnature/

http://www.rspb.org.uk/Images/stateofnature_tcm9-345839.pdf

If you need to narrow it down further, then this paper on bryophytes might be of interest: Preston, Christopher D.; Hill, Mark O.; Porley, Ron D.; Bosanquet, Sam D.S.. 2010 Survey of the bryophytes of arable land in Britain and Ireland 1: a classification of arable field assemblages. Journal of Bryology, 32 (2). 61-79.