Document Type

Article

Article Version

Publisher's PDF

Publication Date

2011

Abstract

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.

Comments

Copyright 2011 American Geographical Union / Wiley

The final publisher PDF has been archived here with permission from the copyright holder.

Publication Title

Geophysical Research Letters

Published Citation

Sundareshwar, P. V., Upadhayay, S., Abessa, M., Honomichl, S., Berdanier, B., Spaulding, S. A., Sandvik, C., & Trennepohl, A. (2011). Didymosphenia geminata: Algal blooms in oligotrophic streams and rivers. Geophysical Research Letters, 38(10).

DOI

10.1029/2010GL046599

Peer Reviewed

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