Insights into zooplankton‐cyanobacteria interactions derived from enclosure studies
作者:
CarolynW. Burns,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1987)
卷期:
Volume 21,
issue 3
页码: 477-482
ISSN:0028-8330
年代: 1987
DOI:10.1080/00288330.1987.9516243
出版商: Taylor & Francis Group
关键词: blue‐green algae;cyanobacteria;enclosures;grazing;interactions;nutrient cycling;species composition;zooplankton
数据来源: Taylor
摘要:
Few workers have used enclosures specifically to study interactions between zoo‐plankton and cyanobacteria. Differences among studies in enclosure size, nutrient level, plankton abundance and species composition, presence or absence of fish, and length of experiments make generalisations difficult. Zooplankton had no direct effect on the growth of ungrazed cyanobacteria(Anabaena flos‐aquae, Aphanizomenon flos‐aquae, largeMicrocystiscolonies) in short‐term (<5 days) and long‐term (> 1 month) enclosure studies. When large cyanobacteria were abundant, someDaphniaspp. snowed reduced reproduction and development. When large grazers were abundant they suppressed the growth of edible, colonial cyanobacteria (Aphanizomenon elenkinii, smallMicrocystiscolonies). By altering the ambient light and nutrient environment, large zooplankton may suppress cyanobacteria; evidence for the importance of grazers in promoting cyanobacterial dominance by removing competing phytoplankton species is equivocal. Zooplankton may suppress nitrogen fixation by cyanobacteria through ammonia excretion and may promote a change in dominance from diatoms to cyanobacteria through recycling phosphorus but not silicon.
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