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Diurnal and seasonal variations in grazing by bacterivorous mixotrophs in an oligotrophic clearwater lake

Pålsson, Carina LU and Granéli, Wilhelm LU (2003) In Archiv für Hydrobiologie 157(3). p.289-307
Abstract
The biomass and bacterial ingestion rates of mixotrophic phytoflagellates were examined on diurnal and seasonal scales in oligotrophic Lake Skarlen (S. Sweden). Ingestion rates were measured using fluorescent microspheres in situ on three depths every 6(th) hour during 24 hours in summer in order to quantify diurnal variations and once at midday during autumn, winter and spring. Mixotrophic phytoflagellates composed a large part of the phytoplankton biomass (18-31 %) throughout the year. Nonetheless, calculations suggest that the mixotrophs only consumed between 0.5 and 4.4 % of the bacterial carbon production, with the highest consumption percentage in winter under ice. Two groups of algae, Cryptomonas spp. and Dinobryon spp., were... (More)
The biomass and bacterial ingestion rates of mixotrophic phytoflagellates were examined on diurnal and seasonal scales in oligotrophic Lake Skarlen (S. Sweden). Ingestion rates were measured using fluorescent microspheres in situ on three depths every 6(th) hour during 24 hours in summer in order to quantify diurnal variations and once at midday during autumn, winter and spring. Mixotrophic phytoflagellates composed a large part of the phytoplankton biomass (18-31 %) throughout the year. Nonetheless, calculations suggest that the mixotrophs only consumed between 0.5 and 4.4 % of the bacterial carbon production, with the highest consumption percentage in winter under ice. Two groups of algae, Cryptomonas spp. and Dinobryon spp., were commonly found with ingested prey and both exhibited significant diurnal differences in bacterial ingestion rates with the highest mean rates measured in late afternoon (0.50 and 0.27 bacteria cell(-1) hour(-1), respectively) and very low rates during night (0.09 and 0.06 bacteria cell(-1) hour). In Cryptomonas spp., ingestion rates also varied.somewhat over the year and bacterial ingestion was highest during winter (0.57 bacteria cell(-1) hour), possibly as a result of the lengthy impaired light climate. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Archiv für Hydrobiologie
volume
157
issue
3
pages
289 - 307
publisher
E. Schweizerbart Science Publishers
external identifiers
  • wos:000184227800001
  • scopus:17944397467
ISSN
0003-9136
DOI
10.1127/0003-9136/2003/0157-0289
language
English
LU publication?
yes
id
3052a05d-dcb4-46d2-8e34-f71a3802120c (old id 136804)
date added to LUP
2007-06-29 07:18:07
date last changed
2018-05-29 12:13:15
@article{3052a05d-dcb4-46d2-8e34-f71a3802120c,
  abstract     = {The biomass and bacterial ingestion rates of mixotrophic phytoflagellates were examined on diurnal and seasonal scales in oligotrophic Lake Skarlen (S. Sweden). Ingestion rates were measured using fluorescent microspheres in situ on three depths every 6(th) hour during 24 hours in summer in order to quantify diurnal variations and once at midday during autumn, winter and spring. Mixotrophic phytoflagellates composed a large part of the phytoplankton biomass (18-31 %) throughout the year. Nonetheless, calculations suggest that the mixotrophs only consumed between 0.5 and 4.4 % of the bacterial carbon production, with the highest consumption percentage in winter under ice. Two groups of algae, Cryptomonas spp. and Dinobryon spp., were commonly found with ingested prey and both exhibited significant diurnal differences in bacterial ingestion rates with the highest mean rates measured in late afternoon (0.50 and 0.27 bacteria cell(-1) hour(-1), respectively) and very low rates during night (0.09 and 0.06 bacteria cell(-1) hour). In Cryptomonas spp., ingestion rates also varied.somewhat over the year and bacterial ingestion was highest during winter (0.57 bacteria cell(-1) hour), possibly as a result of the lengthy impaired light climate.},
  author       = {Pålsson, Carina and Granéli, Wilhelm},
  issn         = {0003-9136},
  language     = {eng},
  number       = {3},
  pages        = {289--307},
  publisher    = {E. Schweizerbart Science Publishers},
  series       = {Archiv für Hydrobiologie},
  title        = {Diurnal and seasonal variations in grazing by bacterivorous mixotrophs in an oligotrophic clearwater lake},
  url          = {http://dx.doi.org/10.1127/0003-9136/2003/0157-0289},
  volume       = {157},
  year         = {2003},
}