Dissolved organic matter and lake metabolism: Biogeochemistry and controls of nutrient flux dynamics in lakes: Technical progress report, 1 July 1988--30 June 1989

Technical Report · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5826985

Wetzel, R G

This research concentrates on the importance of dissolved organic matter as the key functional way that the high littoral and wetland contributions regulates freshwater ecosystem metabolism (both running and standing waters). Much of this contribution is a result of the high DOM loadings and the slow but large decomposition of this massive dissolved detrital organic matter. The evidence for these concepts was gathered over the years both in these studies and many others, so that the pervasiveness of detrital dynamics is universally found as a major component of aquatic ecosystem metabolism. A second major area involves coupling the land-water interface metabolism to pelagic regulation via nutrient regulation. The research of the current studies focused upon (1) the physiological couplings between epiphytic periphyton and the supporting submersed macrophytes, and (2) the physiological capabilities of algae and bacteria to utilize enzymatically dissolved organic phosphorus compounds has been and is being examined rigorously along gradients from the littoral through the pelagic regions. The dissolved organic polyphenolic compounds of littoral and wetland macrophyte origins have been shown to be complex and inhibit phosphatase and other enzyme activities, and thereby regulate availability and uptake kinetics of limiting nutrients and subsequent growth. 323 refs., 26 figs.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA). Dept. of Biology
• DOE Contract Number: FG02-87ER60515
• OSTI ID: 5826985
• Report Number(s): DOE/ER/60515-338-Pt.1; COO-1599-338-Pt.1; ON: DE89016562
• Country of Publication: United States
• Language: English

Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
BACTERIA
BIODEGRADATION
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMOPHYCOTA
CYANOBACTERIA
DECOMPOSITION
DIATOMS
DOCUMENT TYPES
ECOLOGICAL CONCENTRATION
ECOLOGY
ELEMENTS
GROWTH
LAKES
MICROORGANISMS
NITRATES
NITROGEN COMPOUNDS
NONMETALS
ORGANIC MATTER
OXYGEN
OXYGEN COMPOUNDS
PLANTS
POPULATION DENSITY
PROGRESS REPORT
SEASONAL VARIATIONS
SEDIMENTS
SULFATES
SULFUR COMPOUNDS
SURFACE WATERS
VARIATIONS