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Testing the effect of CO sub(2) concentration on the dynamics of marine heterotrophic bacterioplankton

Grossart, Hans-Peter ; Allgaier, Martin ; Passow, Uta ; Riebesell, Ulf

Limnology and oceanography, 2006-01, Vol.51 (1), p.1-11 [Periódico revisado por pares]

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  • Título:
    Testing the effect of CO sub(2) concentration on the dynamics of marine heterotrophic bacterioplankton
  • Autor: Grossart, Hans-Peter ; Allgaier, Martin ; Passow, Uta ; Riebesell, Ulf
  • Assuntos: Bacteria
  • É parte de: Limnology and oceanography, 2006-01, Vol.51 (1), p.1-11
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-2
  • Descrição: To date no study exists that directly addresses changes in dynamics of heterotrophic bacteria in surface waters in relation to partial pressure of CO sub(2) (pCO sub(2)). Therefore, we studied the effect of changes in pCO sub(2) on bacterial abundance and activities by using mesocosms with different pCO sub(2) levels ( similar to 190, similar to 370, and similar to 700 ppmV, representing past, present-day, and future atmospheric pCO sub(2), respectively). Abundance of total bacteria did not differ with increasing pCO sub(2) throughout the whole study period, whereas bacterial protein production (BPP) was highest at highest pCO sub(2). This effect was even more pronounced for cell-specific production rates, especially those of attached bacteria, which were up to 25 times higher than those of free bacteria. During the breakdown of the bloom, however, the abundance of both free and attached bacteria was significantly increased with pCO sub(2). Differences in bacterial growth rate ( mu ) were smaller than those of BPP, but both mu and BPP of attached bacteria were elevated under high pCO sub(2). Averages of total protease as well as alpha - and alpha -glucosidase activities were highest at elevated pCO sub(2) levels, but a statistically significant dependence on pCO sub(2) was only evident for protease activity. There is a measurable but indirect effect of changes in pCO sub(2) on bacterial activities that are mainly linked to phytoplankton and presumably particle dynamics.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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