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The Abundance and Composition of Freshwater Picocyanobacteria in Relation to Light Penetration

F. R. Pick
Limnology and Oceanography
Vol. 36, No. 7 (Nov., 1991), pp. 1457-1462
Stable URL: http://www.jstor.org/stable/2837651
Page Count: 6
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The Abundance and Composition of Freshwater Picocyanobacteria in Relation to Light Penetration
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Abstract

The abundance and composition of picocyanobacterial (PC) assemblages were measured in 38 lakes of varying trophic state and dissolved inorganic C concentrations. Light attenuation provided the best prediction of PC abundance, explaining half of the variation in summer abundance. Phycoerythrin-containing PC were particularly abundant $(>10^5 cells ml^-1)$ in oligotrophic to mesotrophic hard-water lakes, while nonphycoerythrin types were generally found in eutrophic and colored lakes. The percentage of phycoerythrin-containing PC declined significantly with increasing light attenuation among lakes and within experimental enclosures of one lake where light attenuation was altered by nutrient additions and food-web manipulations. The relationship may be the consequence of changes in spectral quality as lakes become nutrient enriched or colored by humic material.

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