Influence of light on bacterioplankton in a tropical lake

Lindell, Måns; Edling, Hélène

doi:10.1007/bf00020548

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…This was also found by Aas et al (1996), Lindell & Edling (1996), Lyons et al (1998) and Pakulski et al (1998). Inhibition can be assumed to be only a result of changes in quantity and quality of the photon flux since this was the only parameter that changed with depth of the incubated samples in our study.…”

Section: Discussionsupporting

confidence: 90%

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Diurnal variations in depth profiles of UV-induced DNA damage and inhibition of bacterioplankton production in tropical coastal waters

Visser¹,

Poos²,

Scheper³

et al. 2002

Mar. Ecol. Prog. Ser.

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In this study, diurnal changes in bacterial production and DNA damage in bacterioplankton (measured as cyclobutane pyrimidine dimers, CPDs) incubated in bags at different depths in tropical coastal waters were investigated. The DNA damage and inhibition of the bacterial production was highest at the surface and decreased with depth. Inhibition of both leucine (Leu) and thymidine (TdR) incorporation was detectable to a depth of 10 m, while DNA damage was measurable only until 5 m. In addition, the decrease of the inhibition of Leu and TdR incorporation with depth was less than the decrease in DNA damage. Variations in DNA damage in bacteria and in biodosimeters were mostly explained by UV radiation (UVR) dose received over time and depth. UVB radiation (UVBR) contributed more than UVA radiation (UVAR) to the damage. The attenuation coefficient of DNA damage with depth was comparable to the attenuation coefficients of UVBR suggesting that DNA damage was induced mainly by UVBR. For incubations at the surface, there was a trend of increasing DNA damage at a constant rate during the entire period of daylight, while the inhibition of leucine incorporation showed a trend of a less rapid increase in the afternoon than in the morning. This might have been due to photorepair, which would also explain the lack of correlation between the inhibition of leucine incorporation and UV dose. It was concluded that CPD damage in DNA is not necessarily the predominant factor in the inhibition of bacterial production. It cannot explain the large impact of sunlight on bacterioplankton productivity in tropical waters. KEY WORDS: DNA damage · Bacterial production · UV radiationResale or republication not permitted without written consent of the publisher

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Section: Discussionsupporting

confidence: 90%

“…Inactivations of enzymes, e.g. inhibition of transport of nutrients or amino acids, can be a consequence of UVAR exposure (Fernandez & Pizarro 1996, Lindell & Edling 1996. To obtain more insight into all these different UV-induced processes, it is clear that more research is needed.…”

Section: Discussionmentioning

confidence: 99%

Diurnal variations in depth profiles of UV-induced DNA damage and inhibition of bacterioplankton production in tropical coastal waters

Visser¹,

Poos²,

Scheper³

et al. 2002

Mar. Ecol. Prog. Ser.

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“…in contrast, thirteen other relatively unpolluted tropical coastal lagoons in rio de Janeiro state have an average of 3.65 µg chl a l -1 (Farjalla et al, 2001). the observed initial bacterial abundance (3.4 x 10 9 cells l -1 ), biomass (2.4 µm c), and secondary productivity (0.032 µm c h -1 ) are within the range of most tropical freshwater ecosystems (torréton et al, 1994;Benner et al, 1995;lindell & edling, 1996;Anesio et al, 1997;thomaz & esteves, 1997;Bouvy et al, 1998). direct disposal of sewage into imboassica lagoon, although stimulating phytoplankton growth (melo, 2001), has not resulted in higher bacterial abundance, biomass, and secondary productivity than that found in other, less impacted Brazilian tropical coastal lagoons (Farjalla et al, 2001;Farjalla et al, 2002).…”

Section: Discussionmentioning

confidence: 98%

Bacterial growth and DOC consumption in a tropical coastal lagoon

Farjalla¹,

Enrich‐Prast²,

Esteves³

et al. 2006

Braz. J. Biol.

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The aims of this research were to determine the main limiting nutrient to bacterial growth in Imboassica lagoon, southeastern Brazil, to estimate the percentage of dissolved organic carbon (DOC) available for bacterial growth, and to determine the bacterial growth efficiency (BGE) of natural assemblages. Bacterial growth and DOC consumption were determined in batch culture experiments, in which water samples were supplemented with nitrogen and phosphorus together or separately, or incubated without nutrient additions. When added together, N and P stimulated higher bacterial growth rates and production, as well as higher DOC consumption. The BGEs and DOC consumption rates were strongly dependent on the method used to determine bacterial production. The BGE ranged from 11 to 72%. However, only a minor fraction of bulk DOC was consumed by the planktonic bacteria (from 0.7 to 3.4%). The results suggest that low availability of phosphorus and nitrogen coupled with excess organic carbon was the main factor responsible for the relatively low bacterial utilization of DOC in Imboassica lagoon.

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“…Although the use of polyethylene containers in UV work has been criticized (Holm-Hansen & Helbling 1993), this criticism is itself controversial (Prezelin & Smith 1993), and polyethylene has been routinely used for UV studies (Williamson et al 1994, Davidson et al 1996, Lindell & Edling 1996. Removal of UVB in half the bags was accomplished by placing the polyethylene bag within a second, Mylar bag with a 70 pm wall thickness.…”

Section: Methodsmentioning

confidence: 99%

Effects of ultraviolet-B radiation on two arctic microbial food webs

Wickham¹,

Carstens²

1998

Aquat. Microb. Ecol.

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The impact of UVB radiation on arctic planktonic microb~al communities was examined in 2 shipboard experiments conducted on the northeast coast of Greenland, using water from a sea-ice meltwater pond and a land pond. The experiments were designed as a preliminary investigation of the interaction of UVB and grazer effects on microbial communities, in order to evaluate the net effect of UVB on intact communities. We used Mylar bags to remove the natural levels of UVB, and a variation of the Landry-Hassett type dilution design to manipulate grazer abundance. The experiments allowed UVB effects to be scaled relative to grazing intensity and to growth in the absence of grazing. UVB effects on ciliates and rotifers were highly species-specific and ranged from no growth rate enhancement with the removal of UVB, to strong enhancement, and even to higher numbers in the presence, rather than absence, of UVB. Removal of UVB had little or no effect on heterotrophic flagellates. Nanoand picoplanktonic algae were suppressed by UVB in only 1 experiment, and bacteria showed no enhancement in the absence of UVB in either experiment. When UVB effects occurred in nano-or picoautotrophs or HNF, they were substantially smaller than the mortality produced through grazing. It would appear that at current UVB levels, community-level deleterious effects of UVB on arctic microbial lood webs can be difficult to discern, due to the species-specificity of the effects.

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Influence of light on bacterioplankton in a tropical lake

Cited by 23 publications

References 14 publications

Diurnal variations in depth profiles of UV-induced DNA damage and inhibition of bacterioplankton production in tropical coastal waters

Diurnal variations in depth profiles of UV-induced DNA damage and inhibition of bacterioplankton production in tropical coastal waters

Bacterial growth and DOC consumption in a tropical coastal lagoon

Effects of ultraviolet-B radiation on two arctic microbial food webs

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