General Introduction - Integrated Assessment of Health and Sustainability of Agroecosystems - page 21

Omore, A.O., McDermott, J.J., and Carles, A.B. (1994). Comparison of productivity of cattle graz-
ing systems in small-holder dairy farms in Kiambu District, Kenya. In Proceedings of the
7th International Symposium on Veterinary Epidemiology and Economics . Nairobi, pp.
121-123.
Orians, G.H. (1975). Diversity, stability and maturity in natural ecosystems. In Unifying Con-
cepts in Ecology . Van Dobben, W.H., and Lowe-McConnell, R.H., eds. The Hague,
Netherlands: B.V. Publishers, pp. 139-150.
Pearce, D., Barbier, E., and Markandya, A. (1990). Sustainable Development: Economics and
Environment in the Third World . Edward Elgar, London. 217 pp.
Pimental, D., and Hall, C.W. (1984). Food and Energy Resources . Academic Press, Orlando,
FL. 268 pp.
Powell, J.M., and Williams, T.O. (1993). Livestock, Nutrient Cycling, and Sustainable Agri-
culture in the West African Sahel . Gatekeeper Series SA37. International Institute for
Environment and Development, London. 15 pp.
Powell, J.M., and Williams, T.O. (1995). An overview of mixed farming systems in sub-Saha-
ran Africa. In Livestock and Sustainable Nutrient Cycling in Mixed Farming Systems
of Sub-Saharan Africa. Vol. 2. Powell, J.M., Fernández-Rivera, S., and Williams, T.O.,
eds. Addis Ababa: ILCA.
Ransom, J.K., Ojiem, J., and Anampiu, F.K. (1995). Nutrient flux between maize and live-
stock in a maize-coffee-livestock system in central Kenya. In Livestock and Sustain-
able Nutrient Cycling in Mixed Farming Systems of Sub-Saharan Africa. Vol. 2.
Powell, J.M., Fernández-Rivera, S., and Williams, T.O., eds. Addis Ababa: ILCA, pp.
411- 418.
Rappaport, R.A. (1971). The flow of energy in an agricultural society. Scientific American
225: 116-132.
Rapport, D.J. (1992). Evolution of indicators of ecosystem health. In Ecological Indicators .
McKenzie, D.H., Hyatt, D.E., and McDonald, V.J., eds. London: Elsevier Applied Sci-
ence, pp. 121-134.
Rapport, D.J. (1995). Ecosystem health: What's in a name? Ecosystem Health 1: 1-2.
Rapport, D.J., and Regier, H.A. (1980). An ecological approach to environmental informa-
tion. Ambio 9, 22-27.
Rapport, D.J., Regier, H.A., and Hutchinson, T.C. (1985). Ecosystem behavior under stress.
American Naturalist 125, 617-640.
Robinson, J.V., and Valentine, W.D. (1979). The concepts of elasticity, invulnerability and
invadability. Theoretical Biology 81: 91-104.
Ruitenbeek, H.J. (1991). Indicators of Ecologically Sustainble Development: Towards New
Fundamentals . Ministry of Supply and Services, Ottawa.
Rutledge, R.W. (1974). Ecological Stability: A Systems Theory Viewpoint . Oklahoma State
University, Stillwater. 93 pp.
Schaeffer, D.J. (1991). A toxicological perspective on ecosystem characteristics to track sus-
tainable development. Ecotoxicology and Environmental Safety 22: 225-239.
Schaeffer, D.J., Herricks, E.E., and Kerster, H.W. (1988). Ecosystem health: I. Measuring
ecosystem health. Environmental Management 12, 445-455.
Smit, B., Waltner-Toews, D., Rapport, D., Wall, E., Wichert, G., Gwyn, E., and Wandel, J.
(1998). Agroecosystem Health: Analysis and Assessment . Agroecosystem Health Proj-
ect, University of Guelph, Ontario, Canada. 114 pp.
Spedding, C.R.W. (1988). An Introduction to Agricultural Systems . Elsevier Applied Science,
London. 189 pp.
Stangel, P.J. (1995). Nutrient cycling and its importance in sustaining crop-livestock systems
in sub-Saharan Africa: an overview. In Livestock and Sustainable Nutrient Cycling
in Mixed Farming Systems of Sub-Saharan Africa . Vol. 2. Powell, J.M., Fernández-
Rivera, S., and Williams, T.O., eds. Addis Ababa: ILCA, pp. 35-57.