Microbial dynamics in coastal waters of East Antarctica:bacterial production and nanoflagellate bacterivory

Leakey, Raymond J.G.; Archer, Stephen D.; Grey, Jonathan

doi:10.3354/meps142003

Cited by 57 publications

(37 citation statements)

References 51 publications

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“…Kottmeier & Sulhvan 1990, Leakey et al 1996). We found exposure of natural plankton assemblages to high UV treatments significantly increased the concentration of microheterotrophs and the increase was negatively correlated with the concentration of autotrophs.…”

Section: Trophic Interactionsmentioning

confidence: 69%

Exposure of natural Antarctic marine microbial assemblages to ambient UV radiation: effects on bacterioplankton

Davidson¹,

Heijden²

2000

Aquat. Microb. Ecol.

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Seasonal ozone depletion over Antarctica leads to enhanced UVB (280 to 320 nm) radiation throughout the period of greatest biological production. The effect of UV radiation on bacterioplankton has received little attention, and its effects on marine microheterotrophs and viruses, which mediate bacterial biomass, are poorly understood. This study examined the impact of ambient solar W radiation on bacterioplankton in natural Antarctic microbial communities. Following a lag of 2 d, bacterial concentrations increased all light treatments. Inhibition of bacterial growth increased with increasing UV irradiance and duration of exposure, reaching 27 % inhibition in hlgh UV treatments (c2.0 m equivalent depth) compared to controls after 7 d exposure. Bacterioplankton growth rates declined in all treatments during post-UV incubation, particularly at lower UV irradiances (23.0 m equivalent depth), indicating UV-induced inhibition of bacterial mortality during irradiation. Positive bacterial growth coincided with both phytoplankton mortality and increased microheterotroph concentrations following exposure to high UV irradiances. Exposure of Antarctic microbial communities to ambient UV is likely to increase microbial respiration of carbon in surface waters and reduce vertical carbon flux.

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Section: Trophic Interactionsmentioning

confidence: 69%

Exposure of natural Antarctic marine microbial assemblages to ambient UV radiation: effects on bacterioplankton

Davidson¹,

Heijden²

2000

Aquat. Microb. Ecol.

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“…Without ciliates, grazing on bacteria would be mainly by HNF. Then we carried out calculations in two different ways, (1) bacteria were ingested only by HNF #5 mm, or (2) (Leakey et al 1996). In the Atlantic sector of the Southern Ocean, Becquevort (1997) (Sherr et al 1997).…”

Section: Discussionmentioning

confidence: 99%

“…The functioning of the microbial food web has been widely studied in diverse temperate to polar marine systems (Vaqué et al 1994; Leakey et al 1996;Strom 2000) and the key role of protists and viruses as the main causes of bacterial mortality has been recognized (Bird and Karl 1999;Pedró s-Alió et al 2000;Wells and Deming 2006).…”

mentioning

confidence: 99%

Seasonal changes in planktonic bacterivory rates under the ice‐covered coastal Arctic Ocean

Vaqué

Guadayol

Peters

et al. 2008

Limnology & Oceanography

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Bacterivory was determined in surface waters of Franklin Bay, western Arctic, over a seasonal ice-covered period (winter-spring, 2003-2004). The objectives were to obtain information on the functioning of the microbial food web under the ice, during winter , and to test whether bacterial losses would increase after the increase in bacterial production following the spring phytoplankton bloom. Chl a concentrations ranged from 0.04 to 0.36 mg L 21 , increasing in March and reaching a peak in April. Bacterial biomass showed no consistent trend for the whole period, and protist biomass followed a pattern similar to that of Chl a. Bacterial production increased 1 week after Chl a concentrations started to increase, while bacterivory rates increased very slightly. Average bacterivory rates in winter (0.16 6 0.07 mg C L 21 d 21 ) were not significantly different from those in spring (0.29 6 0.24 mg C L 21 d 21 ). Average bacterial production, on the other hand, was similar to bacterivory rates in winter (0.19 6 0.38 mg C L 21 d 21 ), but higher than bacterivory in spring (0.93 6 0.28 mg C L 21 d 21 ). Therefore, bacterial production was controlled by grazers during winter and by substrate concentration in spring.

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“…Therefore, heterotrophic bacteria in Antarctic shelf waters must ultimately depend on in 5 situ PP for organic matter. The question of coupling between phytoplankton and bacterial 6 activity has been studied at several locations around the Antarctic continent (Billen and 7 Becquevort, 1991;Leakey et al, 1996) including the WAP region. In the RACER (Research on 8…”

Section: Phytoplankton Dynamics and Coupling To Bacteria We Examine mentioning

confidence: 99%

Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula: A regional and decadal investigation

Ducklow

Schofield

Vernet

et al. 2012

Journal of Marine Systems

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Microbial dynamics in coastal waters of East Antarctica:bacterial production and nanoflagellate bacterivory

Abstract: Bacterial production and heterotrophic nanoflagellate (HNAN) bacterivory were determined concurrently with measurements of abundance and biomass a t weekly intervals between 30

Cited by 57 publications

References 51 publications

Exposure of natural Antarctic marine microbial assemblages to ambient UV radiation: effects on bacterioplankton

Exposure of natural Antarctic marine microbial assemblages to ambient UV radiation: effects on bacterioplankton

Seasonal changes in planktonic bacterivory rates under the ice‐covered coastal Arctic Ocean

Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula: A regional and decadal investigation

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