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Recruitment of resting stages may induce blooms of Microcystis at low N : P ratios

Ståhl-Delbanco, Annika LU ; Hansson, Lars-Anders LU and Gyllström, Mikael LU (2003) In Journal of Plankton Research 25(9). p.1099-1106
Abstract
Some species of cyanobacteria form resting stages at the sediment surface when environmental conditions become unfavourable. As conditions turn more favourable, these resting stages hatch to the water phase, where the cells grow, reproduce, and sometimes form blooms. Since blooms of cyanobacteria have become an increasing threat to inland and brackish waters, it is important to assess the mechanisms and processes involved in the initiation of such blooms. One such mechanism is recruitment from the sediment surface. Potential factors regulating the recruitment of resting stages include variations in nutrient concentrations and ratios, as well as variations in grazing. To investigate how the recruitment of Microcystis responds to different... (More)
Some species of cyanobacteria form resting stages at the sediment surface when environmental conditions become unfavourable. As conditions turn more favourable, these resting stages hatch to the water phase, where the cells grow, reproduce, and sometimes form blooms. Since blooms of cyanobacteria have become an increasing threat to inland and brackish waters, it is important to assess the mechanisms and processes involved in the initiation of such blooms. One such mechanism is recruitment from the sediment surface. Potential factors regulating the recruitment of resting stages include variations in nutrient concentrations and ratios, as well as variations in grazing. To investigate how the recruitment of Microcystis responds to different levels of these factors, we performed an enclosure experiment (zooplankton abundances were regulated by predation from fish). We found that recruitment and growth were most pronounced at the second highest nutrient concentration (average concentrations were 498 mug l(-1) of dissolved nitrogen and 134 mug l(-1) of total phosphorus), while no direct response to different grazing levels was detected. We also found that resting stages can be important for initiating and sustaining blooms. The environmental conditions most important in regulating the recruitment rate from resting stages corresponded to the requirements of the plankton cells, namely high nutrient addition and low N:P ratio. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Plankton Research
volume
25
issue
9
pages
1099 - 1106
publisher
Oxford University Press
external identifiers
  • wos:000185148600008
  • scopus:0141569687
ISSN
0142-7873
DOI
10.1093/plankt/25.9.1099
language
English
LU publication?
yes
id
0d4f92a4-f949-456c-8822-d5726ae1ee03 (old id 136799)
date added to LUP
2007-06-29 08:03:07
date last changed
2017-01-01 06:44:17
@article{0d4f92a4-f949-456c-8822-d5726ae1ee03,
  abstract     = {Some species of cyanobacteria form resting stages at the sediment surface when environmental conditions become unfavourable. As conditions turn more favourable, these resting stages hatch to the water phase, where the cells grow, reproduce, and sometimes form blooms. Since blooms of cyanobacteria have become an increasing threat to inland and brackish waters, it is important to assess the mechanisms and processes involved in the initiation of such blooms. One such mechanism is recruitment from the sediment surface. Potential factors regulating the recruitment of resting stages include variations in nutrient concentrations and ratios, as well as variations in grazing. To investigate how the recruitment of Microcystis responds to different levels of these factors, we performed an enclosure experiment (zooplankton abundances were regulated by predation from fish). We found that recruitment and growth were most pronounced at the second highest nutrient concentration (average concentrations were 498 mug l(-1) of dissolved nitrogen and 134 mug l(-1) of total phosphorus), while no direct response to different grazing levels was detected. We also found that resting stages can be important for initiating and sustaining blooms. The environmental conditions most important in regulating the recruitment rate from resting stages corresponded to the requirements of the plankton cells, namely high nutrient addition and low N:P ratio.},
  author       = {Ståhl-Delbanco, Annika and Hansson, Lars-Anders and Gyllström, Mikael},
  issn         = {0142-7873},
  language     = {eng},
  number       = {9},
  pages        = {1099--1106},
  publisher    = {Oxford University Press},
  series       = {Journal of Plankton Research},
  title        = {Recruitment of resting stages may induce blooms of Microcystis at low N : P ratios},
  url          = {http://dx.doi.org/10.1093/plankt/25.9.1099},
  volume       = {25},
  year         = {2003},
}