Didymosphenia geminata: Algal blooms in oligotrophic streams and rivers

Details Didymosphenia geminata: Algal blooms in oligotrophic streams and rivers Didymosphenia geminata: Algal blooms in oligotrophic streams and rivers

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810405s&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 10, CiteID L10405

Mathematics

Logic

Biogeosciences: Benthic Processes (4804), Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Limnology (1845, 4239, 4942), Biogeosciences: Nutrients And Nutrient Cycling (4845, 4850), Biogeosciences: Water Quality

Scientific paper

In recent decades, the diatom Didymosphenia geminata has emerged as nuisance species in river systems around the world. This periphytic alga forms large “blooms” in temperate streams, presenting a counterintuitive result: the blooms occur primarily in oligotrophic streams and rivers, where phosphorus (P) availability typically limits primary production. The goal of this study is to examine how high algal biomass is formed under low P conditions. We reveal a biogeochemical process by which D. geminata mats concentrate P from flowing waters. First, the mucopolysaccaride stalks of D. geminata adsorb both iron (Fe) and P. Second, enzymatic and bacterial processes interact with Fe to increase the biological availability of P. We propose that a positive feedback between total stalk biomass and high growth rate is created, which results in abundant P for cell division. The affinity of stalks for Fe in association with iron-phosphorus biogeochemistry suggest a resolution to the paradox of algal blooms in oliogotrophic streams and rivers.

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