Toolik Lake project: Terrestrial and freshwater research on change in the Arctic

Technical Report · Sun Mar 01 04:00:00 EST 1992

OSTI ID:7161470

Hobbie, J E; Peterson, B J; Shaver, G R

The Toolik Lake research project in the foothills of the North Slope, Alaska, has collected data since 1975 with funding from the NSFs Division of Polar Programs and from the Long Term Ecological Research Program and Ecosystems Research Program of the Division of Biotic Systems and Resources. The broad goal is to understand and predict how ecosystems of tundra, lakes, and streams function and respond to change. One specific goal is to understand the extent of control by resources (bottom-up control) or by grazing and predation (top-down control). The processes and relationships are analyzed in both natural ecosystems and in ecosystems that have undergone long-term experimental manipulations to simulate effects of climate and human-caused change. These manipulations include the fertilization of lakes and steams, the addition and removal of lake trout from lakes, the changing of the abundance of arctic grayling in sections of rivers, the exclusion of grazers from tundra, and the shading, fertilizing, and heating of the tussock tundra. A second specific goal is to monitor year-to-year variability and to measure how rapidly long-term change occurs. The measurements include: for lakes, measurements of temperature, chlorophyll, primary productivity; for streams, nutrients, chlorophyll on riffle rocks, insect and fish abundance, and water flow; and for the tundra, amount of flowering, air temperature, solar radiation, and biomass. A third specific goal is to understand the exchange of nutrients between land and water.

• Research Organization: Marine Biological Lab., Woods Hole, MA (United States)
• OSTI ID: 7161470
• Report Number(s): AD-P-007312/2/XAB
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
540310 -- Environment
Aquatic-- Basic Studies-- (1990-)
ALASKA
AMBIENT TEMPERATURE
ANIMALS
AQUATIC ORGANISMS
ARCTIC REGIONS
ARTHROPODS
CARBOXYLIC ACIDS
CHLOROPHYLL
CLIMATIC CHANGE
DEVELOPED COUNTRIES
ECOSYSTEMS
FISHES
FORECASTING
FRESH WATER
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INSECTS
INVERTEBRATES
LAKES
NORTH AMERICA
NUTRIENTS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
POLAR REGIONS
PORPHYRINS
PROTEINS
RADIATIONS
RESEARCH PROGRAMS
RIVERS
SOLAR RADIATION
STELLAR RADIATION
STREAMS
SURFACE WATERS
TEMPERATURE MEASUREMENT
TROUT
TUNDRA
USA
VERTEBRATES
WATER