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The effects of aeration on growth and toxicity of Prymnesium parvum grown with and without algal prey

Vidyarathna, N. K.; Fiori, E.; Lundgren, V. M. and Graneli, Edna LU (2014) In Harmful Algae 39. p.55-63
Abstract
We investigated the effects of aeration on growth and toxicity of the haptophyte Prymnesium parvum in the presence and absence of the algal prey Rhodomonas sauna. Batch monocultures of P-limited P. parvum and N and P sufficient R. sauna and mixed cultures of the two microalgae were grown with no, low (20) and high (100) ml min(-1) aeration for 18 days. Cell growth of P. parvum and R. salina and cell toxicity of P. parvum were studied over the experimental period. The highest specific growth rates of P. parvum were found at low aeration rates. R. sauna in monocultures showed typical growth patterns, while R. sauna numbers declined rapidly in the mixed cultures. Of the initial cell densities, 98-100% of the R. salina cells were lysed or... (More)
We investigated the effects of aeration on growth and toxicity of the haptophyte Prymnesium parvum in the presence and absence of the algal prey Rhodomonas sauna. Batch monocultures of P-limited P. parvum and N and P sufficient R. sauna and mixed cultures of the two microalgae were grown with no, low (20) and high (100) ml min(-1) aeration for 18 days. Cell growth of P. parvum and R. salina and cell toxicity of P. parvum were studied over the experimental period. The highest specific growth rates of P. parvum were found at low aeration rates. R. sauna in monocultures showed typical growth patterns, while R. sauna numbers declined rapidly in the mixed cultures. Of the initial cell densities, 98-100% of the R. salina cells were lysed or ingested within 24 h of mixing with P. parvum cells. The maxima P. parvum biomasses were significantly higher in the mixed cultures than in the monocultures. Cell toxicity of P. parvum increased significantly in response to aeration rates and the highest levels were found in the high aeration condition. Availability of prey and resupply of inorganic nutrients decreased P. parvum cell toxicity. Our study suggests that P. parvum is tolerant and is able to grow over a broad range of aeration and associated turbulence effects though low aeration represents an optimal condition for growth. As P. parvum toxicity was higher in the high aeration treatment we suggest that the higher concentrations of oxygen cause more toxins to be produced, as these are oxygen rich compounds. We suggest that oxygenation and turbulence of surface waters caused by mixing may be involved in promoting high toxic P. parvum blooms in shallow lakes and coastal waters. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
categories
Higher Education
in
Harmful Algae
volume
39
pages
55 - 63
publisher
Elsevier
external identifiers
  • scopus:84908426038
ISSN
1878-1470
DOI
10.1016/j.hal.2014.06.010
language
English
LU publication?
no
id
995c871e-7708-48c0-94d6-ba5447da1703 (old id 7994201)
date added to LUP
2015-09-29 11:23:54
date last changed
2017-03-12 03:17:26
@article{995c871e-7708-48c0-94d6-ba5447da1703,
  abstract     = {We investigated the effects of aeration on growth and toxicity of the haptophyte Prymnesium parvum in the presence and absence of the algal prey Rhodomonas sauna. Batch monocultures of P-limited P. parvum and N and P sufficient R. sauna and mixed cultures of the two microalgae were grown with no, low (20) and high (100) ml min(-1) aeration for 18 days. Cell growth of P. parvum and R. salina and cell toxicity of P. parvum were studied over the experimental period. The highest specific growth rates of P. parvum were found at low aeration rates. R. sauna in monocultures showed typical growth patterns, while R. sauna numbers declined rapidly in the mixed cultures. Of the initial cell densities, 98-100% of the R. salina cells were lysed or ingested within 24 h of mixing with P. parvum cells. The maxima P. parvum biomasses were significantly higher in the mixed cultures than in the monocultures. Cell toxicity of P. parvum increased significantly in response to aeration rates and the highest levels were found in the high aeration condition. Availability of prey and resupply of inorganic nutrients decreased P. parvum cell toxicity. Our study suggests that P. parvum is tolerant and is able to grow over a broad range of aeration and associated turbulence effects though low aeration represents an optimal condition for growth. As P. parvum toxicity was higher in the high aeration treatment we suggest that the higher concentrations of oxygen cause more toxins to be produced, as these are oxygen rich compounds. We suggest that oxygenation and turbulence of surface waters caused by mixing may be involved in promoting high toxic P. parvum blooms in shallow lakes and coastal waters.},
  author       = {Vidyarathna, N. K. and Fiori, E. and Lundgren, V. M. and Graneli, Edna},
  issn         = {1878-1470},
  language     = {eng},
  pages        = {55--63},
  publisher    = {Elsevier},
  series       = {Harmful Algae},
  title        = {The effects of aeration on growth and toxicity of Prymnesium parvum grown with and without algal prey},
  url          = {http://dx.doi.org/10.1016/j.hal.2014.06.010},
  volume       = {39},
  year         = {2014},
}