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Algal growth control by a barley straw extract.
A S Ball1, M Williams, D Vincent
1Department of Biological Sciences, John Tabor Laboratories, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK. andrew@essex.ac.uk
Bioresource Technology
|March 29, 2001
Summary
Barley straw extract effectively inhibits harmful algal blooms in potable water. Even dilute decomposed barley straw extract significantly reduces growth of Microcystis sp., a toxin-producing cyanobacterium.
Area of Science:
- Environmental Science
- Aquatic Ecology
- Phycology
Background:
- Harmful algal blooms (HABs) are increasing in potable water sources.
- Effective and safe methods for HAB control are needed.
- Cyanobacteria, such as Microcystis sp., pose significant risks due to toxin production.
Purpose of the Study:
- To assess the potential of barley straw extract to inhibit algal growth.
- To compare the effects of barley straw and wheat straw on algal biomass.
- To investigate the efficacy of decomposed barley straw extract against specific algal species.
Main Methods:
- Algal growth was monitored in lakewater with added barley straw (1% w/v).
- Chlorophyll a concentration was used as a measure of algal biomass.
- Aqueous extract from decomposed barley straw was tested against Microcystis sp. and Scenedesmus.
Main Results:
- Barley straw addition inhibited algal growth, keeping chlorophyll a below 40 µg l⁻¹.
- Wheat straw addition led to a significant increase in algal biomass (1160 µg l⁻¹ chlorophyll a).
- Decomposed barley straw extract (0.005%) markedly inhibited Microcystis sp. and Scenedesmus growth.
Conclusions:
- Barley straw demonstrates significant potential for inhibiting harmful algal blooms in aquatic ecosystems.
- Decomposed barley straw extract is a potent inhibitor of key bloom-forming cyanobacteria like Microcystis sp.
- This natural extract offers a promising, eco-friendly approach to managing potable water quality and mitigating risks associated with HABs.