Bacterivory by sestonic protists in a southeastern blackwater river

Carlough, Leslie A.; Meyer, Judy L.

doi:10.4319/lo.1991.36.5.0873

Cited by 48 publications

(26 citation statements)

References 24 publications

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“…An ingestion rate of 30 bacteria cell" h-' has also been recorded at 1.8OC for cultures of the bacterivorous HNAN Paraphysomonas imperforata isolated from Arctic waters (Choi & Peters 1992). The maximum cellular clearance and ingestion rates recorded in the present study fall within the range of values commonly observed in warmer water environments, although maximum rates from temperate and tropical waters are generally higher (Berninger et al 1991a, Carlough & Meyer 1991, Vaque et al 1994. This is to be expected as HNAN ingestion rate is positively related to temperature both in culture (Caron et al 1986, Tobiesen 1990, Choi & Peters 1992) and in field populations (Peters 1994.…”

Section: Hnan Bacterivorysupporting

confidence: 59%

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

Leakey

Archer²,

Grey³

1996

Mar. Ecol. Prog. Ser.

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Section: Hnan Bacterivorysupporting

confidence: 59%

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

Leakey

Archer²,

Grey³

1996

Mar. Ecol. Prog. Ser.

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“…The abundance of heterotrophic flagellates, most of them in the 'nano' size class, peaked at a comparably high value of 4700 ml -1 in the Darß-Zingst bodden (cf. overview in Sanders et al 1992), and exceeded that in several other estuaries (Dolan & Gallegos 1991, Laybourn-Parry et al 1992, El Serehy & Sleigh 1993 and some lakes (Carlough & Meyer 1991, Vörös et al 1996.…”

Section: Darß-zingst Bodden -High Abundance Of Heterotrophic Micro-ormentioning

confidence: 71%

Viability of bacteria from different aquatic habitats. I. Environmental conditions and productivity

Schumann¹,

Rieling²,

Görs³

et al. 2003

Aquat. Microb. Ecol.

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Various freshwater, estuarine and coastal stations of the Southern Baltic Sea were comparatively studied to evaluate pelagic bacterial performance. Inner coastal waters (so-called bodden or lagoons) are highly productive systems and dominate the coast of the Southern Baltic Sea. Due to high nutrient loads up to the 1990s in combination with an enhanced primary production, increased amounts of particulate (POC) and dissolved organic carbon (DOC) accumulated in these waters. In the Darß-Zingst bodden chain, POC < 16 and DOC < 13 mg C l -1 , and C:N ratios of 9 to 11 in particulate matter were measured in winter and spring samples. Due to high POC concentrations, the average ratio of DOC:POC was 1.1:1, which is very low compared to other aquatic systems. Bacterial abundance and activities were rather high and reached 24 × 10 6 ml -1 and 18 µg C l -1 h -1 , respectively. Although 2 of the 3 investigated freshwater systems were classified as eutrophic, the highest measured POC concentrations, bacterial abundance and production were much lower (1.6 mg C l -1 , 11 × 10 6 bacteria ml ) than in the bodden. In contrast to that, the DOC load was as high as in these inner coastal waters (<12 mg C l -1 ). The coastal stations of the Baltic Sea, classified as mesotrophic, were not severely loaded with organic matter and bacteria (POC < 0.8, DOC < 5.5 mg C l -1 , bacteria < 3 × 10 6 ml -1). Bacterial production again was lower than at all other stations; however, levels did reach an exceptional 4.6 µg C l -1 h -1, which is comparable to values of the freshwater systems. Compared to the other investigated marine and freshwater systems, the bodden were heavily loaded with organic matter, especially particulate organic matter (POM). The origin of this material is assumed to be mainly autochthonous as it is known not to be transported by rivers into these estuaries. Although dissolved inorganic nitrogen (DIN) concentrations were high at least in winter, POM was of poor quality; this was reflected by high C:N ratios and a low contribution of phytoplankton carbon to POC. However, this is particularly surprising, because nitrogen should be readily available at all bodden sites by resuspension from the sediment caused by frequent winds in these very shallow systems of < 2 m depth. KEY WORDS: Organic matter · Bacterial production · Hydrolytic enzymes · Marine systems · Brackish systems · Freshwater systems Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 32: [121][122][123][124][125][126][127][128][129][130][131][132][133][134][135] 2003 organic matter input and decomposition, and subsequently reveal the most important regulating factors of bacterial activity.Besides nutrient availability, grazing as a top down control factor regulates bacterial biomass and species composition (e.g. Berninger et al. 1991). Protozoa, especially heterotrophic nanoflagellates, are an important, or often the dominating, loss factor for bacterial standing stock in pelagic systems (e.g. Jürgens et a...

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“…(1-100) Meyer (1991) lakes, open water marine). For example, in the shortterm experiments the percentage of bacteria consumed by protists per day ranges from 3 to 16 %, and the percentage of bacteria removed in long term experiments (disappearance) ranged from 15 to 34 % (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Fate of bacterial production in a heterotrophic ecosystem: grazing by protists and metazoans in the Hudson Estuary

Vaqué¹,

Pace²,

Findlay³

et al. 1992

Mar. Ecol. Prog. Ser.

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The Hudson River Estuary IS a heterotrophic ecosystem with high rates of planktonic bacterial production. We measured grazing on bacteria in monthly experiments dunng 1990 to determine: ( l ) the prlmary consumers of bacteria; (2) whether absolute rates of grazing on bacteria were high relative to other systems; and (3) whether bacterla were a sufficient carbon resource for consumers. Fluorescent minicells were used to measure the Ingestion of bacteria by heterotrophic flagellates and ciliates. Using the abundances of bacteria, rotifers and cladocerans in the river, we also estimated zooplankton clearance rates. Total grazing of the plankton community was assessed by measuring the disappearance of fluorescent minicells over 24 and 48 h. Heterotrophic flagellates were the primary consumers of bacteria with ciliates and the cladoceran Bosmina longirostris also important seasonally. Ingestion of bacteria by heterotrophic flagellates, ciliates, and B. longirostris was sufficient at most times to satisfy estimated carbon requirements of these consumers. Large bacterial size and relatively low consumer populations in the Hudson account for the apparent sufficiency of bacteria as a carbon source We conclude that grazing on bacteria in the Hudson River is similar to the levels of grazlng observed in other systems. Nevertheless, bacteria are a potentially significant resource, because the domlnant planktonic consumers are capable of ~ngesting bacteria at rates sufficient to support carbon demands. INTRODUCTIONDepending on food web structure, bacteria may be either a link in food webs supporting metazoan production or largely a sink where bacterial production is respired by microorganisms (e.g. Ducklow et al. 1986, Pomeroy & Deibel 1986, Pace et al. 1990, Wylie & Currie 1991. Most investigations of bacteria in aquatic food webs have been carried out on the plankton of lakes and marine systems where bacterial production is typically 30 % of primary production on an area1 basis (reviewed by Cole et al. 1988). Many nearshore marine and estuarine systems, however, are heterotrophic in the sense that total system respiration exceeds primary production (Smith 1991). In these systems allochthonous organic matter may be an espe-'Addressee for correspondence O Inter-Research 1992 cially significant carbon source supporting bacterial production (Coffin & Sharp 1987, Painchaud & Therriault 1989. Under these circumstances, bacteria might be a particularly significant resource for higher consumers presuming bacteria can grow on allochthonous carbon.An example of such a strongly heterotrophic ecosystem is the Hudson River Estuary. Bacteria and phytoplankton are only weakly coupled in this system, and bacterial production exceeds primary production by 2-to 3-fold (Findlay et al. 1991). Total system respiration estimates are consistent with the measurements of bacterial production and the notion that respiration is far in excess of phytoplankton primary production (Howarth et al. 1992). The Hudson River Estuary, with relative...

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Bacterivory by sestonic protists in a southeastern blackwater river

Cited by 48 publications

References 24 publications

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

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

Viability of bacteria from different aquatic habitats. I. Environmental conditions and productivity

Fate of bacterial production in a heterotrophic ecosystem: grazing by protists and metazoans in the Hudson Estuary

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