By Richard F. Wright (auth.), Curt Forsberg, Jan-Åke Johansson (eds.)

ISBN-10: 9400972849

ISBN-13: 9789400972841

ISBN-10: 9400972865

ISBN-13: 9789400972865

'A lake is the landscape's most pretty and expressive function. it's earth's eye; having a look into which the beholder measures the intensity of his personal nature. The fluviatile timber subsequent the shore are the narrow 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's constantly receiving new lifestyles and movement from above.' 'Nothing so reasonable, so natural, and while so huge, as a lake, perhaps, lies at the floor ofthe earth. Sky water. It wishes no fence. countries come and move with out defiling it. it's a replicate which no stone can crack, whose quicksilver won't ever put on off, whose gilding Nature regularly maintenance; no storms, no airborne dirt and dust, can dim its floor ever clean; - a replicate within which all impurity awarded to its sinks, swept and dusted through 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 existence within the Woods'. Fourth printing, April 1953, Ri!lehart & corporation, New York).

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Extra info for Forest Water Ecosystems: Nordic symposium on forest water ecosystems held at Farna, Central Sweden, September 28-October 2, 1981

Sample text

Cinctum fa. westii. The axenic conditions were regu- 37 Table 1. Lindstr5m medium No. 16 (L 16) for Peridinium cinc/um fa. westii. 5 . 0 . 70 MgS04 . 0 . 0 . 74 Na 2Si0 3 . 0 . 0 . 0 . 000184 Fe Mo Zn Mn Co Se Micronutrients FeCI 3 ·6H 2O Na2Mo04 . 2H 2O ZnCI 2 MnCI 2 ·4H 2O CoCl 2 ·6H 2O Na2Se03 . lS . cm- I Alkalinity: meq . 0. 0 . 0 . 0 . 5 . 1 larly checked on nutrient-enriched agar substrates (Oxoid, bactopeptone). Various multiples of the L-medium No. 16 (L 16, Table I) - a development of medium L 12 (Lindstrom & Rodhe 1978) - for P.

These criteria seem valid for Se and the growth of P. cinctum and are for the present only tentatively suggested for some of the other algae in this investigation. The bioactivity of Se concerning the response of P. cinctum (Figs. 1-2) indicates selenite-Se and organic Se to be more readily assimilable than selenate-Se. Maximum content, measured chemically, ofSe in P. cinctum, cultured in medium 2 XL 16 (Table I) is up to 150 X 10- 6 ng . cell-I (M. Remberger, pers. ). The content of Se per cell, based on cell numbers at optimum selenium concentration during maximum growth rate was 36 .

I. 81 B ...... 728 \ x x 2 2 R ...... 731. x x x X X X X X X • x 8. 8. X x 8 8 4 7 8 5 PH N-s2 I. x x x iI ! I X I x x xx R ...... 54 B ...... ~ x x x x x xx I "1 x x AI, Zn and Mn (Figs. 2-6). The relationships are statistically significant at the 99% confidence level (95% for Pt). The plot of Cd versus pH in Fig. 2 is based on the AAS-measurements. 0 I in both cases). Another important factor which influences the trace metal levels in fresh water is the concentration of organics such as humic substances.

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Forest Water Ecosystems: Nordic symposium on forest water ecosystems held at Farna, Central Sweden, September 28-October 2, 1981 by Richard F. Wright (auth.), Curt Forsberg, Jan-Åke Johansson (eds.)


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