Toolik Lake: Ecology Of An Aquatic Ecosystem In Arctic Alaska (developments In Hydrobiology)

The limnological study of Toolik Lake began in the Summer of 1975. This research was an outgrowth of the arctic IBP project which had focused mainly on small Arctic pond ecosystems on the Alaskan Arctic coastal plain. It was thought desirable to study larger, deeper lakes which contained fish to further generalizations developed during the IBP study. Initial research on Toolik Lake and the surrounding lakes and ponds focused on process studies such as annual primary productivity of the lake or the vertical migration patterns of the resident zooplankton. In 1983 the philosophy of the research changed with the funding of a more integrated programme. The fundamental question posed was whether Arctic lake and stream ecosystems are regulated from the bottom up by nutrient availability or from the top down by the density and activity of top predators. In 1987 the Toolik Lake area was designated an LTER (Long-Term Ecological Research) site, one of 18 such sites throughout the United States, Puerto Rico and the Antarctic. The research theme for the Arctic LTER also focuses on the regulation of Arctic ecosystems, whether regulation comes from the top down or bottom up. The Arctic LTER also incorporates a terrestrial component as well as a lake and stream component. Front Matter....Pages i-vii The biogeochemistry and zoogeography of lakes and rivers in arctic Alaska....Pages 1-14 Cation export from Alaskan arctic watersheds....Pages 15-22 The flux of CO 2 and CH 4 from lakes and rivers in arctic Alaska....Pages 23-36 A silicon budget for an Alaskan arctic lake....Pages 37-44 Biogeochemistry of manganese- and iron-rich sediments in Toolik Lake, Alaska....Pages 45-59 Nitrogen and phosphorus concentrations and export for the upper Kuparuk River on the North Slope of Alaska in 1980....Pages 61-69 Water and sediment export of the upper Kuparuk River drainage of the North Slope of Alaska....Pages 71-81 Influences of slimy sculpin ( Cottus cognatus ) predation on the rocky littoral invertebrate community in an arctic lake....Pages 83-90 The influence of light and nutrient addition upon the sediment chemistry of iron in an arctic lake....Pages 91-101 Epilithic diatom community response to years of PO 4 fertilization: Kuparuk River, Alaska (68 N Lat.)....Pages 103-119 Epilithic chlorophyll a , photosynthesis, and respiration in control and fertilized reaches of a tundra stream....Pages 121-131 Community structure and bottom-up regulation of heterotrophic microplankton in arctic LTER lakes....Pages 133-141 Control mechanisms of arctic lake ecosystems: a limnocorral experiment....Pages 143-188 A comparison of slimy sculpin ( Cottus cognatus ) populations in arctic lakes with and without piscivorous predators....Pages 189-201 Effects of fish predation on larval chironomid ( Diptera: Chironomidae ) communities in an arctic ecosystem....Pages 203-211 Cost of predation avoidance in young-of-year lake trout ( Salvelinus namaycush ): growth differential in sub-optimal habitats....Pages 213-218 Shifts in abundance and growth of slimy sculpin in response to changes in the predator population in an arctic Alaskan lake....Pages 219-223 Salmonid diet and the size, distribution, and density of benthic invertebrates in an arctic lake....Pages 225-233 Simulation model of the planktivorous feeding of arctic grayling: laboratory and field verification....Pages 235-245 The effects of river fertilization on mayfly ( Baetis sp.) drift patterns and population density in an arctic river....Pages 247-258 Black fly ( Diptera: Simuliidae ) response to phosphorus enrichment of an arctic tundra stream....Pages 259-265 Access pipes for sampling through thick ice....Pages 267-269