Three-year study of benthic algal spring bloom development in a small, Danish lowland stream
✍ Scribed by Karina Kjeldsen; Torben M. Iversen; Jens Thorup; Peer Lund-Thomsen
- Book ID
- 104615115
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 819 KB
- Volume
- 335
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
Seasonal development of benthic algae was studied over a three-year period in a small, nutrient-rich lowland stream to investigate inter-annual variation in the algal spring bloom and differences in algal biomass regulation on two different substrata: fine-grained sediments and stones . The algal spring bloom was initiated when irradiance at the sediment surface exceeded 7 mol photons m' 2 d -1 and mean water velocity was concomitantly below the threshold for bed load transport in the stream . Large inter-annual and substratum-dependent differences in peak algal biomass were observed, thus suggesting that different parameters regulate algal biomass development on the two substrata . On fine-grained sediments algal biomass development was predominantly coupled to light availability, while on stony substrata algal composition and peak biomass might be affected by invertebrate grazing .