Department of Biology
King’s College
London, U.K.

" The measurement of large-scale gas exchange between the biosphere and the atmosphere is extremely necessary, but it is difficult in practice. The use of aircraft sampling with laser-based detection equipment has produced good data for carbon dioxide and ozone in stable conditions, and prospects are promising for carbon monoxide, methane, sulfur dioxide, oxides of nitrogen, and others.

P.A. Matson, R.C. Harriss, “Prospects for aircraft-based gas exchange measurements in ecosystem studies,” Ecology, 69 (5), 1318-25, October 1988.

" High variability in the genetic constitution of a population is generally regarded as a valuable feature, providing a resource for adaptation to new conditions. The lack of genic diversity in a scarce aquatic plant, Howellia aquatilis, determined by protein electrophoresis, bodes ill for its long-term survival prospects.

P. Lesica, RE Leary, F.W. Allendorf, D.E. Bilderback...

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