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- Title
Algal assays of archipelago waters. Quantitative aspects.
- Authors
Lindahl, P. E. Björn; Melin, K. E. Roland
- Abstract
Eighteen surface water samples were collected during 1970 from Lake Mälaren (freshwater) and to the outer part of the Stockholm Archipelago (brackish water). After filtration most samples were enriched with phosphate (P), nitrate (N) and chelated trace elements (TE), alone or in combination, and inoculated with blue-green algae, Oscillatoria Agardhii or Aphanizomenon flos-aquae, isolated from the investigated area. The algae (not free from bacteria) were cultivated under standard conditions. The dry weight at harvesting was used to evaluate the growth-stimulating effect (in comparison with unenriched controls) of the additions. The yields of O. Agardhii (the controls and those with all three additions) were largest 17–26 km to the east of Slussen, the Stockholm lock. During the year the smallest growth occurred during summer. The results with A. flos-aquae followed a similar distribution pattern. Regression analysis of the results with O. Agardhii showed that enrichment with TE or P, alone or together, did not stimulate growth. The addition of N, alone and in combinations with TE or P, stimulated the growth, in proportion to the growth in the unenriched water samples. The enrichment with P + N + TE gave the largest stimulation.
- Subjects
ALGAE; AQUATIC resources; PHYTOPLANKTON; BRACKISH waters; SALINE waters; FRESHWATER biology; AQUATIC biology
- Publication
Oikos, 1973, Vol 24, Issue 2, p171
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3543872