By Richard F. Wright (auth.), Curt Forsberg, Jan-Åke Johansson (eds.)
'A lake is the landscape's most pretty and expressive characteristic. it really is earth's eye; having a look into which the beholder measures the intensity of his personal nature. The fluviatile bushes subsequent the shore are the slim eyelashes which fringe it, and the wooded hills and cliffs round are its overhanging brows.' 'A box of water betrays the spirit that's within the air. it truly is continuously receiving new existence and movement from above.' 'Nothing so reasonable, so natural, and whilst so huge, as a lake, maybe, lies at the floor ofthe earth. Sky water. It wishes no fence. countries come and move with out defiling it. it's a reflect which no stone can crack, whose quicksilver won't ever put on off, whose gilding Nature continuously upkeep; no storms, no airborne dirt and dust, can dim its floor ever clean; - a replicate within which all impurity offered to its sinks, swept and dusted by means of the sun's hazy brush, - this the sunshine dust-cloth, - which keeps no breath that's breathed on it, yet sends its personal to drift as clouds excessive above its floor, and be mirrored in its bosom still.' (Henry David Thoreau: 'Walden; or lifestyles within the Woods'. Fourth printing, April 1953, Ri!lehart & corporation, New York).
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Additional resources for Forest Water Ecosystems: Nordic symposium on forest water ecosystems held at Farna, Central Sweden, September 28-October 2, 1981
Acidified lakes (pH < 5) generally demonstrated much lower concentrations of bioactive Se «20 ng . I-I) than neutral, fertilized, lime-enriched, slightly acidic or humic lakes (>20 ng . I-I). 92; n = 7). The ecological importance of Se is suggested for some common species of phytoplankton. Introduction Since Robinson (1933) found selenium (Se) toxic in grains and Schwarz & Foltz (1957) discovered it to be essential in mammal nutrition, considerable information about the existence and the consequences of this element in abiotic and biotic systems has been accumulating (Selenium and Tellurium A bstracts; Zingaro & Cooper 1974; Gam boa Lewis 1976; Swaine 1979).
The determination of metals was made by graphite furnace atomic absorption spectroscopy (AAS), hydride-flameless AAS (As only), differential pulse anodic stripping voltammetry (ASV) and neutron activation analysis (N AA), which was used both for water samples and for filters. 07 total interlaboratory standard deviation of 30-70% for cadmium and lead, and 15-55% for copper, with the highest figures for the samples with the lowest metal concentrations. Good agreement was generally obtained between AAS- and ASV-analyses of lead, cadmium and copper and between AAS- and NAA-analyses of iron, arsenic and aluminium.
1980), acting against inhibiting superoptimal nutrient concentrations cannot be excluded in the experiments with the green algae. The occurrence of impurities, bacteria and algal excreta may also effect the fluorescence yield. If these data are generally valid, selenium may be characterized as an element with ecological relevance for a number of common phytoplankton genera which often dominate in fresh waters. They also emphasize the significance of inorganic and organic micronutrients, which beside P0 4-P and NO)-N may limit algal growth in natural waters.