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Chemical and biological characteristics of Emerald Lake and the streams in its watershed and the responses of the lake and streams to acidic deposition. Final report

Technical Report ·
OSTI ID:5192279
; ; ; ;
This report describes the results of field work conducted at Emerald Lake in Sequoia National Park during the period of 1983-88, with an emphasis on the effects of acid deposition on a high-elevation lake in the Sierra Nevada. Time-series data were collected for major ions, nutrients, trace metals, chlorophyll, zooplankton and zoobenthos. Mass balances were calculated for major solutes in the lake, including analysis of the inflows and major solutes in the lake, including analysis of the inflows and outflow from the lake. The ecology and population dynamics of the resident population of brook trout were studied in detail. Biological surveys indicated the presence of the Pacific tree frog in small ponds in the vicinity of Emerald Lake. Experimental acidification of large bags in the lake was used to develop dose-response relationships for the major zooplankton species, especially Daphnia. The conclusion of the research to date is that Emerald Lake is not currently showing serious chemical or biological effects of acidification. Acid-sensitive animals are found in the lake and associated streams. The surface waters of the Emerald Basin are extremely dilute and ANC-generating processes in the lake are small compared to that of the watershed. Acidic episodes have been recorded. If these episodes were to increase, the surface waters and the biological populations could be readily affected.
Research Organization:
California Univ., Santa Barbara, CA (USA)
OSTI ID:
5192279
Report Number(s):
PB-90-104308/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ACIDIFICATION
AQUATIC ORGANISMS
ATMOSPHERIC PRECIPITATIONS
BIOLOGICAL EFFECTS
BIOLOGICAL INDICATORS
CARBOXYLIC ACIDS
CHEMISTRY
CHLOROPHYLL
DEPOSITION
DOCUMENT TYPES
DOSE-RESPONSE RELATIONSHIPS
ECOLOGY
ELEMENTS
ENVIRONMENTAL EFFECTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROLOGY
LAKES
LIMNOLOGY
MATHEMATICS
METALS
NAPAP
NUTRIENTS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANKTON
PORPHYRINS
PROGRESS REPORT
PROTEINS
RAIN
SEASONAL VARIATIONS
STREAMS
SURFACE WATERS
TIME-SERIES ANALYSIS
VARIATIONS
WATER CHEMISTRY
WATERSHEDS
ZOOPLANKTON