Effects of water mass exchange on bacterial communities in an aquaculture area during summer

Sakami, Tomoko; Abo, Katsuyuki; Takayanagi, Kazufumi; Toda, Satoru

doi:10.1016/s0272-7714(02)00126-9

Cited by 24 publications

(21 citation statements)

References 24 publications

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“…Indeed, a concurrent study undertaken in Loch Fyne during May, June and July 1999 observed higher bacterioplankton production at the fish farm station than at the reference station (R. J. G. Leakey et al unpubl.). Our data are consistent with previous observations of increased bacterioplankton abundance recorded near fish farm cages in Italian and Greek coastal waters (La Rosa et al 2002, Pitta et al 2006) and increased bacterioplankton abundance and production in a eutrophic embayment containing fish net pens off the Japanese coast (Sakami et al 2003); however, studies undertaken in Malaysian mangrove estuaries and western Mediterranean coastal waters have found no response by bacterioplankton to fish farm inputs (Alongi et al 2003, Maldonado et al 2005. In the present study, DON concentrations were significantly higher in the vicinity of the fish farm but DOP concentrations were generally similar at all stations.…”

Section: Discussionsupporting

confidence: 93%

Effect of salmon cage aquaculture on the pelagic environment of temperate coastal waters: seasonal changes in nutrients and microbial community

Navarro¹,

Leakey²,

Black³

2008

Mar. Ecol. Prog. Ser.

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The effects of salmon farm inputs on pelagic nutrient concentrations and planktonic microbial abundance and biomass were investigated in Loch Fyne, a temperate fjordic environment off the west coast of Scotland. The concentration of photosynthetic pigments and inorganic and organic nutrients, and the abundance and biomass of the autotrophic and heterotrophic microorganisms, were determined over a complete annual cycle from 3 depths (5, 15 and 25-30 m) at 4 stations located at differing proximities to the fish farm. Ammonium and dissolved organic nitrogen concentrations and heterotrophic microbial abundance and biomass were significantly higher at the stations nearest to the fish farm, suggesting that these and other nutrients derived from the fish farm may be directly or indirectly enhancing heterotrophic microbial activity. This in turn suggests that the heterotrophic microbial food web was responsible, at least in part, for processing matter and energy released into the pelagic environment from the salmon farm. By contrast, pigment concentrations, including chlorophyll a, tended to be similar at all stations, supporting the conclusions of previous studies that failed to establish a clear relationship between fish farm inputs and phytoplankton biomass. As such, the response of the heterotrophic microbial community is probably a more appro-priate indicator than chlorophyll concentration of local ecological effects of fish farms in temperate coastal waters. KEY WORDS: Fish farm · Plankton community · Bacteria · Nutrients · Chlorophyll Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 361: [47][48][49][50][51][52][53][54][55][56][57][58] 2008 sediment oxygen demand, leading to increases in sulphate reduction, increased inorganic nutrient fluxes and often profound, if spatially limited, effects on the benthic ecosystem. By contrast, relatively few studies have examined the effects of fish farm inputs on the pelagic environment and planktonic ecosystem structure and function (see review in Beveridge 1996, Pitta et al. 1999, Alongi et al. 2003.The most likely means by which inputs from fish farm cages may influence planktonic ecosystems is via alteration of inorganic and organic nutrient pools; although reduced light attenuation and the presence of pollutants (e.g. metals, antibiotics) may also play a role. Dissolved inorganic nutrients are released into the pelagic environment from fish farm cages either directly, as fish excretory products (ammonium and urea), or indirectly as a result of remineralisation of particulate organic waste. Such inorganic nutrient inputs have the potential to enhance the growth of phytoplankton and the formation of harmful phytoplankton blooms has been attributed to aquaculture inputs (e.g. Sorokin et al. 1996). They may also lead to changes in phytoplankton community composition via altered nutrient ratios with, for example, an increased N:Si ratio favouring the growth of flagellates rather than diatoms (Officer & Ryther 1980). ...

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Section: Discussionsupporting

confidence: 93%

Effect of salmon cage aquaculture on the pelagic environment of temperate coastal waters: seasonal changes in nutrients and microbial community

Navarro¹,

Leakey²,

Black³

2008

Mar. Ecol. Prog. Ser.

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“…Comparable levels of bacterial activity were found in the Santa Rosa Sound (Florida) (66 g C liter Ϫ1 day Ϫ1 ) (10), which is a strait that receives discharges from wastewater treatment plants, and in a eutrophic German lake (68.5 g C liter Ϫ1 day Ϫ1 ) (24). Even higher bacterial production was described for an aquaculture area in Japan (172 g C liter Ϫ1 day Ϫ1 on average) (53). In that system, microbial production was correlated with the concentration of dissolved organic nitrogen, suggesting that bacterial activity was supported by allochthonous organic matter from fish farming.…”

Section: Discussionmentioning

confidence: 95%

Blooms of Single Bacterial Species in a Coastal Lagoon of the Southwestern Atlantic Ocean

Piccini

Conde

Alonso

et al. 2006

Appl Environ Microbiol

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We investigated seasonal differences in community structure and activity (leucine incorporation) of the planktonic bacterial assemblage in the freshwater and brackish-water zones of a shallow coastal lagoon of the southwestern Atlantic Ocean. Alphaproteobacteria formed the dominant microbial group in both zones throughout the sampling period. After an intrusion of marine water, members of the SAR11 lineage became abundant in the brackish-water zone. These bacteria were apparently distributed over the lagoon during the following months until they constituted almost 30% of all prokaryotic cells at both sampling sites. At the first sampling date (March 2003) a single alphaproteobacterial species unrelated to SAR11, Sphingomonas echinoides, dominated the microbial assemblages in both zones of the lagoon concomitantly with a bloom of filamentous cyanobacteria. Pronounced maxima of leucine incorporation were observed once in each zone of the lagoon. In the freshwater zone, this highly active microbial assemblage was a mix of the typical bacteria lineages expected in aquatic systems. By contrast, a single bacterial genotype with >99% similarity to the facultative pathogen gammaproteobacterial species Stenotrophomonas maltophilia formed >90% of the bacterial assemblage (>10 7 cell ml ؊1 ) in the brackish-water zone at the time point of highest bacterial leucine incorporation. Moreover, these bacteria were equally dominant, albeit less active, in the freshwater zone. Thus, the pelagic zone of the studied lagoon harbored repeated short-term blooms of single bacterial species. This finding may have consequences for environmental protection.

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“…1). Oceanic seawater often intrudes into the bay because a branch stream of the Kuroshio Current runs near the bay's mouth 31) . The discharge of river water is rather slight and the salinity of water of the bottom is usually greater than 33, even at the bay's end.…”

Section: Study Site and Sample Collectionmentioning

confidence: 99%

“…Calibration was performed using standard solutions of 7-amino-4-methylcoumarin and 4-methylumbelliferone. Bacterial production was measured by the incorporation of 3 H-thymidine into cold trichloroacetic acid (TCA)-insoluble material as described previously 31) .…”

Section: Microbial Parametersmentioning

confidence: 99%

“…Bacterial community structures are influenced by specific physico-chemical conditions in large estuaries 2,8,18) and are related to microbial activities 6,40) . Environmental conditions in small bays also fluctuate widely, not only according to river water discharge but also according to effects of oceanic water intrusion into the bay 31) . Bacterial communities in such a small bay might have various structures and activities that differ from those in a large river estuary.…”

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confidence: 99%

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Seasonal and Spatial Variation of Bacterial Community Structure in River-Mouth Areas of Gokasho Bay, Japan

Sakami

2008

Microb. Environ.

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This study investigated seasonal and spatial dynamics of the bacterial community in Gokasho bay with denaturing gradient gel electrophoresis (DGGE) profiles of PCR-amplified 16S rRNA gene fragments. The community structure was related to physico-chemical water conditions in the area examined. The bacterial community clustered into three groups: bacteria collected during January-May; those collected from water at the surface in July and September; and those collected from water at the bottom in July and September and from both depths in November. Canonical correspondence analyses indicated that the seasonal variability in bacterial community was associated with water temperature succession. On the other hand, concentrations of particulate organic matter and nitrite plus nitrate were related to the vertical change in community structure in summer and autumn as well as HNF abundance, suggesting that both top-down and bottom-up control affected the community. The influence of salinity was insignificant though bacterial production was related to salinity. No relationship was observed between the variation in community structure and that in hydrolytic enzyme activity. The results indicate that changes in bacterial activity are not coupled with variation in community structure.

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Effects of water mass exchange on bacterial communities in an aquaculture area during summer

Cited by 24 publications

References 24 publications

Effect of salmon cage aquaculture on the pelagic environment of temperate coastal waters: seasonal changes in nutrients and microbial community

Effect of salmon cage aquaculture on the pelagic environment of temperate coastal waters: seasonal changes in nutrients and microbial community

Blooms of Single Bacterial Species in a Coastal Lagoon of the Southwestern Atlantic Ocean

Seasonal and Spatial Variation of Bacterial Community Structure in River-Mouth Areas of Gokasho Bay, Japan

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