Light‐dependence of photosynthesis and growth in cyanobacteria: Implications for their dominance in eutrophic lakes
作者:
MaxM. Tilzer,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1987)
卷期:
Volume 21,
issue 3
页码: 401-412
ISSN:0028-8330
年代: 1987
DOI:10.1080/00288330.1987.9516236
出版商: Taylor & Francis Group
关键词: algal growth;blue‐green algae;cyanobacteria;dominance;light;photoinhibition;photosynthesis;phycobilins;phytoplankton;respiration
数据来源: Taylor
摘要:
In eutrophic lakes cyanobacteria are favoured relative to other phytoplankton, both under stratified and mixed conditions. During stratification, gas vacuole formation allows the accumulation of dense surface scums which attain the highest possible area‐specific photosynthetic rates in aquatic environments owing to high irradiances, near‐complete harvesting of impinging light, and minimal light inhibition and photo‐oxidation. During moderate mixing, high yields of biomass can be achieved by effective light harvesting for photosynthesis (aided by phycobilin pigments) and low maintenance energy requirements at low mean irradiances. Howevrr, nitrogen fixation competes for energy and reductant with photosynthesis, and leads to a decline of light‐saturated maximum growth rates. Wind‐driven vertical mixing and lateral advection are the main causes for the instability of cyanobacterial blooms in hyper‐eutrophic lake ecosystems.
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