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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d89may34

"UV-B Dose/Dose-Rate Responses of Seasonally Abundant Copepods of Puget Sound," D.B. Dey (NOAA, 2725 Montlake Blvd. E, Seattle WA 98113), D.M. Damkaer, G.A. Heron, Oecologia, 76(3), 321-329, 1988.

The UV-B dose/dose-rate thresholds for five species of copepods were determined and compared to previously studied zooplankton groups. Generally species appearing later in the spring and summer were less UV-B sensitive. To improve estimates of impact due to UV-B levels, the natural conditions or processes that influence the composition and intensity of the UV radiation to various species must be understood.

Item #d89may35

"The Influence of Elevated Carbon Dioxide Concentrations on the Partitioning of Carbon in Source Leaves of Phaseolus vulgaris," J. Hoddinott (Dept. Plant Sci., Univ. Brit. Columbia, Vancouver, B.C. V6T 2A2, Can.), P. Jolliffe, Can. J. Bot., 66(12), 2396-2401, Dec. 1988.

In laboratory studies cultivar Gold Crop was grown to the third trifoliate leaf stage in CO2 concentrations of 380, 800 and 1400 ppm. There was no effect of the CO2 concentration on plant height, leaf area, or dry weight, but the specific leaf weight as well as the starch content of the leaves increased with CO2 level. Labeling experiments with 14CO2 showed that increasing the CO2 concentration around the source leaf just after labeling increased all carbon flux rates and reduced the residence times in the leaf pools.

Item #d89may36

"The Effects of Enriched Carbon Dioxide Atmospheres on Plant-Insect Herbivore Interactions," E.D. Fajer (Dept. Organismic Biol., Harvard Univ., Cambridge MA 02138), M.D. Bowers, F.A. Bazzaz, Science, 243(4895), 1198-1200, Mar. 3, 1989.

Larvae of a specialist insect herbivore, Junonia coenia, were reared on one of its host plants, Plantago lanceolata, and grown in low (350 ppm) or high (700 ppm) CO2 environments. Those larvae raised on high CO2 foliage grew more slowly and experienced greater mortality, especially in early instars, than those raised on low CO2 foliage. This was due probably to the reduced foliar water and nitrogen concentrations of those plants and not to changes in the concentration of defensive compounds (iridoid glycosides). Results indicate interactions between plants and herbivorous insects will be modified under the predicted CO2 concentrations of the 21st century.

Item #d89may37

Letter on climatic change and forests, ibid., 243(4894), 991, Feb. 24, 1989.

Item #d89may38

"The Stability Bias and Adjustment to Climatic Variability: The Case of the Rising Level of the Great Salt Lake," P.M. Morrisette (NCAR, POB 3000, Boulder CO 80307), Appl. Geog., 8(3), 171-189, July 1988.

Discusses Utah's Great Salt Lake as a case of societal adjustment to climatic variability. Argues that important decisions have been and continue to be based on a misconception that the lake is stable. Discusses costs of rigid short-term adjustments to lake-level variability and climatic variability.

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