Quantifying phosphorus and light effects in stream algae

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Limnology and Oceanography

DOI:https://doi.org/10.4319/lo.2009.54.1.0368· OSTI ID:1015097

Hill, Walter ^[1]; Fanta, S E ^[2]; Roberts, Brian J ^[3]

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1. University of Illinois, Urbana-Champaign
2. University of Illinois
3. ORNL

Simultaneous gradients of phosphorus and light were applied in experimental streams to develop quantitative relationships between these two important abiotic variables and the growth and composition of benthic microalgae. Algal biovolume and whole-stream metabolism responded hyperbolically to phosphorus enrichment, increasing approximately two-fold over the 5-300 g L-1 range of experimental phosphorus concentrations. The saturation threshold for phosphorus effects occurred at 25 g L-1 of soluble reactive phosphorus (SRP). Light effects were much stronger than those of phosphorus, resulting in a nearly ten-fold increase in algal biovolume over the 10-400 mol photons m-2 s-1 range of experimental irradiances. Biovolume accrual was light-saturated at 100 mol photons m-2 s-1 (5 mol photons m-2 d-1). Light effects were diminished by low phosphorus concentrations, and phosphorus effects were diminished by low irradiances, but evidence of simultaneous limitation by both phosphorus and light at subsaturating irradiances was weak. Contrary to the light:nutrient hypothesis, algal phosphorus content was not significantly affected by light, even in the lowest SRP treatments. However, algal nitrogen content increased substantially at lower irradiances, and it was very highly correlated with algal chlorophyll a content. Phosphorus enrichment in streams is likely to have its largest effect at concentrations <25 g L-1 SRP, but the effect of enrichment is probably minimized when streambed irradiances are kept below 2 mol photons m-2 d-1 by riparian shading or turbidity

• Research Organization: Oak Ridge National Laboratory (ORNL); Oak Ridge National Environmental Research Park
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1015097
• Journal Information: Limnology and Oceanography, Journal Name: Limnology and Oceanography Journal Issue: 1 Vol. 54; ISSN 0024-3590
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CHLOROPHYLL
HYPOTHESIS
METABOLISM
NITROGEN
PHOSPHORUS
PHOTONS
SATURATION
SHADING
TURBIDITY