An Ecosystem Approach to Aquatic Ecology: Mirror Lake and by Gene E. Likens, F. Herbert Bormann (auth.), Gene E. Likens

By Gene E. Likens, F. Herbert Bormann (auth.), Gene E. Likens (eds.)

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As part of the Mirror Lake ecosystem studies, three holes were drilled through the drift and at least 30 m into the bedrock; a fourth hole was drilled 61 m into the bedrock. Geologic descriptions of the samples of drilled rock and geophysical data were obtained for each of the holes. Geophysical surveys using seismic refraction were done at the land surface around most of the perimeter of Mirror Lake and at a few locations higher in the drainage basin. A-2). A-3). A south arm of a bedrock valley begins at this saddle and descends to the north.

G. mobilizing Aln+) toxic effects. There is considerable controversy about historical trends in acid precipitation because data are few. The record of measurements at Hubbard Brook is the longest in North America. Whereas at some other sites there has been some increase or decrease in pH values with time, only small changes have been observed at Hubbard Brook (see Likens et al. 1979, 1984). 10) decline in annual volume-weighted H+ concentration after 1970- B. Biogeochemistry 37 71. Also the range of concentration in weekly appreciably more acid than the remaining porsamples has narrowed, and the distribution has tions (Hornbeck et al.

During years with excessive stormpeaks, exports of P tend to exceed inputs to the stream-ecosystem, whereas in average years with few and small peaks, inputs may be stored or balanced by outputs. Our data for 1968-69 suggest that inputs of nitrogen may exceed outputs from the stream-ecosystem by small amounts <10% (Meyer et al. 1981). These net gains have been interpreted as evidence for temporary storage of N in the stream-ecosystem. However, denitrification losses were not evaluated carefully and relationships may change from year to year depending on hydrologic patterns.

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