Epilithic algae distribution along a chemical gradient in a naturally acidic river, Río Agrio (Patagonia, Argentina).

Microbial Ecology
Gustavo D Baffico

Abstract

The epilithic algae distribution along a pH gradient and the relationship between the chemical gradient and biomass development were studied in Río Agrio, a naturally acidic river located in Patagonia (Argentina). The epilithic community was monitored during the summer of three consecutive years in sites located above and below the entrance of tributaries. The epilithic community showed differences between sites based on the chemical composition of the water and the precipitates that appear on the streambed of the river. The lowest biomass, diversity, and number of species were found at the most extreme part of the river in terms of pH (ca. 2) and element concentrations. Euglena mutabilis was the dominant species in this section of the river. As pH increased (ca. 3), the community changed to be dominated by filamentous green algae (Ulothrix spp., Mougeotia sp., Klebsormidium sp.) showing luxuriant growths in terms of biomass. With the inflow of a neutral tributary, the pH of Río Agrio increased above 3, and the precipitates of orange-red iron hydroxides appeared. The algal community was not affected by these precipitates or the low P concentrations, along the next 30 km of river downstream from this site. The apparent physical ...Continue Reading

References

Jul 10, 2001·The British Journal of Surgery·M LångJ Takala
Jan 7, 2005·Extremophiles : Life Under Extreme Conditions·Gustavo D BafficoFernando Pedrozo
Apr 29, 1988·Science·D M McKnightK E Bencala

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Citations

Nov 16, 2013·Environmental Science & Technology·Christina JeschkeMatthias Koschorreck

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