Short-term variations of bacterioplankton in Antarctic zone: Terre Adelie area

Delille, Daniel; Bouvy, Marc; Cahet, G.

doi:10.1007/bf02012643

Cited by 46 publications

(19 citation statements)

References 38 publications

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“…In contrast with the primary productivity, bacterial activity seems not directly related to temperature . This observation confirms previous work in the Southern Ocean (Delille et al ., 1988 ;Vincent, 1988 ;Delille & Perret, 1989 ;Fukunaga & Russell, 1990 ;Vosjan & Olanczuk-Neyman, 1991 ;Nedwell & Rutter, 1994) which demonstrate that the temperature seems to have only a rather limited influence on Antarctic and subantarctic bacterioplanktonic communities. With decrease of temperature and light the relative importance of bacterial communities increases .…”

Section: Resultssupporting

confidence: 83%

Seasonal changes in bacterial and phytoplankton biomass in a subantarctic coastal area (Kerguelen Islands)

1996

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The seasonal variations of bacterial and phytoplanktonic biomass were studied during several pluri-annual surveys in the subantarctic Morbihan Bay (Kerguelen Islands, 49 '20 S ; 70 °10 E) . Large interannual variation was observed . Phytoplanktonic biomass showed moderate values during winter and autumn . They increased sharply in spring, reaching a maximum value of about 1 mg C 1 -1 corresponding to an important depletion of nutrients . A second phytoplanktonic bloom of similar amplitude occurred in late summer . During algal blooms which were roughly associated with optimal values of solar irradiation for the first one and with the highest temperatures for the second one, phytoplanktonic material represented near 100% of particulate and living carbon . Bacteria showed maximal abundance (0 .2 to 0 .7 mg C 1 -1 ) during summer or autumn . Their relative abundance,which represented less than 1% of the living biomass in spring and summer, can reach more than 95% in autumn and winter.

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Section: Resultssupporting

confidence: 83%

Seasonal changes in bacterial and phytoplankton biomass in a subantarctic coastal area (Kerguelen Islands)

1996

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“…4, 5, 6). In contrast, the similarity between heterotrophic data obtained in seawater samples after incubations at 2°C or 12°C confirms results from previous works from the Southern Ocean (Delille et al 1988;Vincent 1988;Delille and Perret 1989;Fukunaga and Russell 1990;Vosjan and Olanczuk-Neyman 1991), and demonstrates that despite the extreme cold, the temperature seems to have only a limited influence on Antarctic bacterioplanktonic populations. Thus, the sub-ice seawater bacterial communities appeared to be essentially psychrotrophic.…”

Section: Discussionsupporting

confidence: 91%

“…This discrepancy between total bacterial abundance and parameters more related to active response to nutrient supply is not surprising. Density-independent growth has been reported previously for both planktonic and sea ice bacterial communities (Hanson et al 1983;Delille et al 1988).…”

Section: Discussionmentioning

confidence: 82%

“…As a result, most of the research on microbial communities in the Austral Ocean has focused primarily on seawater and sea ice microalgae (see Vincent 1988 or Palmisano and Garrison 1993 for a review). However, bacteria may contribute significantly to the carbon and energy transfers within the Southern Ocean (B61ter and Dawson 1982;Sullivan and Palmisano 1984;Hanson and Lowery 1985;Delille et al 1988;Fiala and Delille 1993). More than 50% of primary production can be attributed to microbial regeneration of nutrients (Ronner et al 1983;Koike et al 1986).…”

Section: Introductionmentioning

confidence: 97%

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Seasonal changes of Antarctic marine bacterioplankton and sea ice bacterial assemblages

Delille

Rosiers

1996

Polar Biol

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The distributions of bacterial populations in sea ice and underlying seawater were investigated on the continental shelf of the "Terre Ad61ie" area. A reference station was sampled weekly from January 1991 to January 1992. In winter, the survey included a minimum of six sampling layers: surface and bottom ice, brine, seawater from the interface, and at 0.5 and 2 m depth. In seawater, the total bacterial abundance ranged from 0.5 x 105 cells m1-1 in July to 6.0 x l0 s cells m1-1 after ice break. Values reaching 2.5 x 106 cells mI-1 were recorded in the overlying ice cover. Mean cell volumes were twice as high in brine as in seawater. The saprophytic bacterial abundance ranged from 5.0 x 10 ~ CFU (colony-forming units) m1-1 in some winter interface samples to less than 1.0 x 103 CFU ml -1 in most of the summer seawater samples. In sea ice a clear decreasing gradient for most of the studied bacterial parameters from the surface layers towards the bottom layer was found. The ice cover had a discernible impact on underlying seawater, but its influence was restricted to a limited interface layer.

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“…The seasonal changes in bacterial populations are essential to understand because bacteria are key elements, especially in the Antarctic marine food web (Bolter & Dawson, 1982;Sullivan & Palmisano, 1984;Hanson & Lowery, 1985;Delille et al, 1988). An intense temporal variability occurs in Antarctic seawaters, perhaps the most extreme seasonality observed anywhere in the world ocean (Karl, 1993).…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes of subantarctic benthic bacterial communities

Delille

1995

Hydrobiologia

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From December 1982 to February 1985 systematic observations of heterotrophic bacterial populations were recorded for a nearshore marine sediment of Kerguelen Archipelago. A weekly survey included physicochemical (temperature, mineral and organic C and N) measurements. Total (A.O.D C.) and saprophytic (M.P.N. on Zobell medium) counts were used for quantitative bacterial investigations. Heterotrophic microbial activities were estimated by 14 C glucose and 1 4 C glutamic acid uptake measurements. The bacterial community structure was investigated by carrying out 57 morphological and biochemical tests on 1742 isolated strains. Quantitative data were treated by principal component analysis. Qualitative data were analysed by a numerical taxonomy technique using similarity coefficients with WPGM algorithm. The % abundance of the various taxonomic groups varied greatly with season. Although non fermentative Gram-negative rods were generally dominant, the existence of a succession of populations during bacterial growth resulting from periodical organic enrichements is clearly demonstrated. The nutrient supply rather than the temperature seems to be the major factor determining microbial fluctuations in the studied subantarctic coastal marine environments.

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Short-term variations of bacterioplankton in Antarctic zone: Terre Adelie area

Cited by 46 publications

References 38 publications

Seasonal changes in bacterial and phytoplankton biomass in a subantarctic coastal area (Kerguelen Islands)

Seasonal changes in bacterial and phytoplankton biomass in a subantarctic coastal area (Kerguelen Islands)

Seasonal changes of Antarctic marine bacterioplankton and sea ice bacterial assemblages

Seasonal changes of subantarctic benthic bacterial communities

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