Download PDF by Gerald R. Visgilio, Diana M. Whitelaw: Acid in the Environment: Lessons Learned and Future

By Gerald R. Visgilio, Diana M. Whitelaw

ISBN-10: 0387375619

ISBN-13: 9780387375618

This ebook is the results of a convention held biannually on the Goodwin-Niering middle for Conservation Biology and Environmental experiences at Connecticut collage. It makes use of an interdisciplinary method of concentrate on very important ecological affects of acid deposition. The booklet combines examine findings and the coverage analyses of specialists from various educational disciplines with the positions complicated by means of representatives of varied nongovernmental enterprises.

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Additional resources for Acid in the Environment: Lessons Learned and Future Prospects

Sample text

The so-called German Bight is a shallow sea located between 6° 12'E and 55°15'N covering an area of ca. 31,150 km 2 with a mean depth of24 m. It contains a water volume of about 736 km 3 , which has a mean residence time of 2 months (Hainbucher et al. 1986; Schonfeld and Radach, pers. ). The dissolved cadmium content within this water column can be assessed using the Cd concentration values published recently by Mart and Niirnberg (1986). These researchers determined the dissolved and total Cd concentrations over several years at different seasons.

Their calculations show that this feces might amount to 1 m 3 during one season in densely populated areas (250 mean-sized individuals m- 2 ) with I-weekly turnover of the uppermost cm of sediment layer. Sediment-reworking activities such as burrowing, feeding, ingestion, and egestion by infaunal species contribute to the subduction of nutritive material below the sediment-water interface (Aller 1982). ). Nutrient levels are highest in late winter, because uptake by phytoplankton is at its lowest due to low solar radiation and temperature, while mineralization of organic detritus from the bottom deposits continues to some extent during winter.

1986). , metals are liberated along with phosphate and other mineralization products in the top cm. In other words, considerable pollutant liberation occurs within a very short time after deposition from the aerobic degradation ofthe organic substrates. Metals released in dissolved form migrate along the pore water gradient downward into the reducing zone of the sediment where they can precipitate as a sulfide phase (or Fe-oxyhydrates in the case of phosphate). Both metals and phosphate may, however, also migrate upwards across the sediment-water interface into the overlying water column, occurring as bioavailable species with potential for benthic organism impact.

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Acid in the Environment: Lessons Learned and Future Prospects by Gerald R. Visgilio, Diana M. Whitelaw


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