The impact of physical processes on algal growth

Imboden, D.M. (1992) The impact of physical processes on algal growth. In: Sutcliffe, David W. and Jones, J. Gwynfryn (eds.) Eutrophication: research and application to water supply. Ambleside, UK, Freshwater Biological Association, pp. 30-43. (FBA Special Publications,3)

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Mixing and transport processes in surface waters strongly influence the structure of aquatic ecosystems. The impact of mixing on algal growth is species-dependent, affecting the competition among species and acting as a selective factor for the composition of the biocoenose. Were it not for the ever-changing ”aquatic weather”, the composition of pelagic ecosystems would be relatively simple. Probably just a few optimally adapted algal species would survive in a given water-body. In contrast to terrestrial ecosystems, in which the spatial heterogeneity is primarily responsible for the abundance of niches, in aquatic systems (especially in the pelagic zone) the niches are provided by the temporal structure of physical processes. The latter are discussed in terms of the relative sizes of physical versus biological time-scales. The relevant time-scales of mixing and transport cover the range between seconds and years. Correspondingly, their influence on growth of algae is based on different mechanisms: rapid changes are relevant for the fast biological processes such as nutrient uptake and photosynthesis, and the slower changes are relevant for the less dynamic processes such as growth, respiration, mineralization, and settling of algal cells. Mixing time-scales are combined with a dynamic model of photosynthesis to demonstrate their influence on algal growth.

Item Type: Book Section
Title: The impact of physical processes on algal growth
Personal Creator/Author:
Imboden, D.M.
Title of Book: Eutrophication: research and application to water supply
Sutcliffe, David W.
Jones, J. Gwynfryn
Refereed: No
Series Name: FBA Special Publications
Volume: 3
Page Range: pp. 30-43
Date: 1992
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
ISBN: 978-0900386-52-7
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Eutrophication; Algal blooms; Phytoplankton; Nutrients (mineral); Freshwater lakes; Physical limnology; Models; Growth; Photosynthesis; Water mixing
Subjects: Ecology
Item ID: 5286
Depositing User: Hardy B Schwamm
Date Deposited: 09 May 2011 20:04
Last Modified: 29 Sep 2011 15:11

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