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Cell lysis of competitors and osmotrophy enhance growth of the bloom forming alga Gonyostomum semen

Rengefors, Karin LU ; Pålsson, Carina LU ; Hansson, Lars-Anders LU and Heiberg, Lisa LU (2008) In Aquatic Microbial Ecology 51(1). p.87-96
Abstract (Swedish)
Abstract in Undetermined

The nuisance alga Gonyostomum semen (Raphidophyceae) is known to form dense blooms in many freshwater bodies, and has increased its distribution and abundance. However, information on the mechanisms behind bloom formation and maintenance is scarce. Field observations indicate that G. semen may be favored in humic lakes, In the present study, we performed controlled laboratory experiments on cultures to test whether G. semen growth is enhanced by humic acids. In addition, we tested the mixotrophic capability of G. semen by providing it with Rhodomonas lacustris as prey. G. semen increased its growth rate in the presence of humic substances due to either acquisition of carbon or some unknown growth... (More)
Abstract in Undetermined

The nuisance alga Gonyostomum semen (Raphidophyceae) is known to form dense blooms in many freshwater bodies, and has increased its distribution and abundance. However, information on the mechanisms behind bloom formation and maintenance is scarce. Field observations indicate that G. semen may be favored in humic lakes, In the present study, we performed controlled laboratory experiments on cultures to test whether G. semen growth is enhanced by humic acids. In addition, we tested the mixotrophic capability of G. semen by providing it with Rhodomonas lacustris as prey. G. semen increased its growth rate in the presence of humic substances due to either acquisition of carbon or some unknown growth factor. Moreover, growth rate was enhanced in the presence of R. lacustris, which in turn was negatively influenced when cultured together with G. semen. We found no evidence of phagotrophy, but observed lysis of R. lacustris cells exposed to G. semen pre-grown with R, lacustris. Thus, our experiments suggest that cell lysis (probably via trichocyst action) and osmotrophy could be 2 mechanisms involved in establishing and maintaining dominance of G. semen in humic lakes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cell lysis, osmotrophy, mixotrophy, humic acids, Gonyostomum semen, raphidophyceae, nuisance bloom
in
Aquatic Microbial Ecology
volume
51
issue
1
pages
87 - 96
publisher
Inter-Research
external identifiers
  • wos:000256190600009
  • scopus:44649155699
ISSN
0948-3055
DOI
10.3354/ame01176
language
English
LU publication?
yes
id
642a24a4-9dba-4864-bb66-7f827b026486 (old id 934069)
date added to LUP
2008-01-17 13:52:17
date last changed
2017-04-16 03:27:30
@article{642a24a4-9dba-4864-bb66-7f827b026486,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
The nuisance alga Gonyostomum semen (Raphidophyceae) is known to form dense blooms in many freshwater bodies, and has increased its distribution and abundance. However, information on the mechanisms behind bloom formation and maintenance is scarce. Field observations indicate that G. semen may be favored in humic lakes, In the present study, we performed controlled laboratory experiments on cultures to test whether G. semen growth is enhanced by humic acids. In addition, we tested the mixotrophic capability of G. semen by providing it with Rhodomonas lacustris as prey. G. semen increased its growth rate in the presence of humic substances due to either acquisition of carbon or some unknown growth factor. Moreover, growth rate was enhanced in the presence of R. lacustris, which in turn was negatively influenced when cultured together with G. semen. We found no evidence of phagotrophy, but observed lysis of R. lacustris cells exposed to G. semen pre-grown with R, lacustris. Thus, our experiments suggest that cell lysis (probably via trichocyst action) and osmotrophy could be 2 mechanisms involved in establishing and maintaining dominance of G. semen in humic lakes.},
  author       = {Rengefors, Karin and Pålsson, Carina and Hansson, Lars-Anders and Heiberg, Lisa},
  issn         = {0948-3055},
  keyword      = {cell lysis,osmotrophy,mixotrophy,humic acids,Gonyostomum semen,raphidophyceae,nuisance bloom},
  language     = {eng},
  number       = {1},
  pages        = {87--96},
  publisher    = {Inter-Research},
  series       = {Aquatic Microbial Ecology},
  title        = {Cell lysis of competitors and osmotrophy enhance growth of the bloom forming alga Gonyostomum semen},
  url          = {http://dx.doi.org/10.3354/ame01176},
  volume       = {51},
  year         = {2008},
}