Bacterioplankton dynamics in the York River estuary: primary influence of temperature and freshwater inputs

Schultz, Gary E.; White, Edward B.; Ducklow, Hugh W.

doi:10.3354/ame030135

Cited by 35 publications

(28 citation statements)

References 50 publications

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“…Temperature has been shown to have a strong positive relationship with BP rate in many estuarine waters (Wright et al 1987, Murrell 2003, Schultz et al 2003, McManus et al 2004, Staroscik & Smith 2004, at least within a certain range of temperatures (Apple et al 2006). This is also the case in the upper nutrient-rich zone of the Urdaibai estuary (Revilla et al 2000).…”

Section: Seasonal Variation In Bacterial Production and Growth Ratementioning

confidence: 83%

“…In many estuaries, temperature has been shown to exert a strong influence on bacterial activity (Schultz et al 2003, McManus et al 2004, Staroscik & Smith, 2004. However, the influence of temperature has been shown to vary along the longitudinal axis in other estuaries (Goosen et al 1997, Revilla et al 2000.…”

Section: Introductionmentioning

confidence: 99%

“…Methodological constraints may be partly responsible for these discrepancies (Sherr et al 1986, Wikner et al 1990, as well as other processes causing biomass losses, such as viral lysis (Fuhrman 1999). In addition to grazing and viral lysis, bacterial abundance and biomass can be controlled by physical factors, such as temperature and supply of substrates, through their effect on bacterial growth rates (Revilla et al 2000, Schultz et al 2003, Staroscik & Smith 2004. However, it is recognized that the relative importance of the various factors that can regulate heterotrophic microbial population densities differs among systems (Wieltschnig et al 1999) and also among seasons (2olić et al 1998).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variability in bacterial abundance, production and protistan bacterivory in the lower Urdaibai estuary, Bay of Biscay

Iriarte¹,

Sarobe²,

Orive³

2008

Aquat. Microb. Ecol.

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. This rate showed seasonal variations and was higher during late winter/early spring than during summer/early autumn. This pattern is probably due to the greater dependence of small HNF on bacteria during late winter/early spring, when the availability of food sources other than bacteria, e.g. autotrophic picoplankton, was low. This led to seasonal variations in the degree of grazing control on the bacterial standing stock, this control being tighter during late winter/early spring. Bacterivory rate was substantially higher than BP in many months, i.e. bacteria showed a negative growth, and this was paralleled by reduction in bacterial abundance. The relationship between log bacterial abundance and log small HNF abundance suggested that small HNF were largely under a substrate supply (bottom-up) control.

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Section: Seasonal Variation In Bacterial Production and Growth Ratementioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal variability in bacterial abundance, production and protistan bacterivory in the lower Urdaibai estuary, Bay of Biscay

Iriarte¹,

Sarobe²,

Orive³

2008

Aquat. Microb. Ecol.

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“…Some seasonal changes are constrained, such as variation in light and temperature, and their influence on the structure and activity of aquatic microbial communities is reasonably well documented (4,9,30,46,51,67). Other variables, including variations in flow and terrestrial runoff associated with storms (22,39), are only partly determined by season, as seasonal differences in storm frequencies are constrained by regional climatic patterns.…”

mentioning

confidence: 99%

Recurring Seasonal Dynamics of Microbial Communities in Stream Habitats

Hullar

Kaplan

Stahl

2006

Appl Environ Microbiol

161

128

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Recurring seasonal patterns of microbial distribution and abundance in three third-order temperate streams within the southeast Pennsylvania Piedmont were observed over 4 years. Populations associated with streambed sediments and rocks (epilithon) were identified using terminal restriction length polymorphism (tRFLP) and sequencing of 16S rRNA genes selectively amplified with primers for the bacterial domain. Analyses of the relative magnitudes of tRFLP peak areas by using nonmetric multidimensional scaling resolved clear seasonal trends in epilithic and sediment populations. Oscillations between two dominant groups of epilithic genotypes, explaining 86% of the seasonal variation in the data set, were correlated with temperature and dissolved organic carbon. Sequences affiliated with epilithic phototrophs (cyanobacteria and diatom chloroplasts), a Rhodoferax sp., and a Bacillus species clustered in the summer, whereas sequences most closely related to "Betaproteobacteria" (putative Burkholderia sp.), and a putative cyanobacterium clustered in the fall/spring. The sediment genotypes also clustered into two groups, and these explained 85% of seasonal variation but correlated only with temperature. A summer tRFLP pattern was characterized by prevalence of "Betaproteobacteria," "Gammaproteobacteria," and a Bacillus sp., whereas the winter/spring pattern was characterized by phylotypes most closely related to "Firmicutes," "Gammaproteobacteria," and "Nitrospirae." A close association between these headwater streams and their watersheds was suggested by the recovery of sequences related to microbial populations provisionally attributed to not only freshwaters but also terrestrial habitats.Headwater streams are a primary link between aquatic and terrestrial ecosystems, transforming and exporting terrestrially derived materials and also contributing to export through autochthonous primary production. Complex communities of macro-and microbiota distributed among different stream habitats primarily mediate these transformations. The trophic structures of stream macrobiota and phototrophic eukaryotic microbiota have been intensively studied as contributors to production and energy flow in lotic systems (26). In contrast, although microorganisms exert significant, if not major, control on system chemistry and the processing of terrestrial inputs, there is little understanding of differences in lotic microbial population structure among biomes, population similarity among streams within a biome, or changes in structure associated with seasonal oscillations in chemical and physical parameters. This information is essential for developing a more complete description of the trophic structure and biogeochemistry of streams, one that more fully incorporates their relationship to the proximal terrestrial system (11,12,16,47,48).Microbial communities in the temperate deciduous forest biome are exposed to seasonal changes in their chemical and physical environments. Some seasonal changes are constrained, such as variation in light a...

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“…Chl a/DOC did, however, show a weak but significant negative correlation with DOC utilization in light-exposed relative to dark treatments (r 2 = 0.31, p ≤ 0.01). Like other estuarine systems, the York is unique in that bacterial production is decoupled from algal sources (Schultz et al 2003). Accordingly, the use of indirect parameters (e.g.…”

mentioning

confidence: 99%

Effects of sunlight on decomposition of estuarine dissolved organic C, N and P and bacterial metabolism

McCallister¹,

Bauer²,

Kelly³

et al. 2005

Aquat. Microb. Ecol.

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The effects of natural sunlight and microbial decomposition on DOC, DON, and DOP were investigated along the salinity gradient of a temperate coastal plain estuary. The impact of sunlight-irradiated DOM on bacterial properties (bacterial abundance, production, bacterial growth efficiency [BGE]) was also followed. Surface-water light levels resulted in no detectable abiotic production of NH 4 + or PO 4 3 -or loss of DOC. Bacterial decomposition of DOC was enhanced by 27 to 200% in irradiated relative to dark treatments. There was, however, no corresponding enhancement in DON and DOP remineralization. Significant differences in bacterial decomposition of light-exposed DOC were frequently observed following prolonged incubation (> 7 d), suggesting that enhanced reactivity may result from photochemical modification of higher molecular weight organic matter. BGE in light relative to dark treatments was positively correlated (r 2 = 0.38, p < 0.01) with in situ NH 4 + concentrations. In light treatments, significantly lower N and P remineralization in August 1999 corresponded with low in situ inorganic nutrient concentrations and bacterial growth efficiency (BGE) and with elevated bacterial DOC utilization. In contrast, enhanced DOC reactivity in April 2000 during nutrient-replete conditions corresponded with net immobilization of inorganic N and P by bacterial biomass production, but without a concomitant impact on BGE. These findings suggest that the combination of photochemical and microbial alteration of DOM may increase bacterial demand for inorganic nutrients, alter BGE, and influence the partitioning of C between bacterial biomass and respiration. KEY WORDS: DOC · DON · DOP · BGE · Phototransformation · Bacterial bioassays Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 40: [25][26][27][28][29][30][31][32][33][34][35] 2005 information available for estuarine DOM that is lower in vascular plant and soil influences and higher in contributions from younger (recently produced) or algalderived organic matter ' (Moran et al. 2000). The effects of sunlight-exposure on DOM cycling in estuaries are difficult to quantify. Variations in initial bioreactivity, age, sources and structural character (e.g. aromaticity) of DOM may affect its biological and photochemical fate during seaward transit (Mopper & Kieber 2002, Moran &Covert 2003 and references therein). In general, the balance between photoinhibition and photostimulation of DOM cycling may hinge on the initial reactivity of various subcomponents of DOM (Moran & Covert 2003). Thus, prediction of sunlight effects on DOM bioavailability and fate on a system scale is limited by the ability to characterize and predict the bioreactivity of the majority of organic compounds comprising the bulk DOM pool (Hedges et al. 2000). This has sometimes been circumvented by the use of microbial activity (e.g. bacterial abundance, growth and production) as a proxy for integrating both positive and negative photochemical imp...

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Bacterioplankton dynamics in the York River estuary: primary influence of temperature and freshwater inputs

Cited by 35 publications

References 50 publications

Seasonal variability in bacterial abundance, production and protistan bacterivory in the lower Urdaibai estuary, Bay of Biscay

Seasonal variability in bacterial abundance, production and protistan bacterivory in the lower Urdaibai estuary, Bay of Biscay

Recurring Seasonal Dynamics of Microbial Communities in Stream Habitats

Effects of sunlight on decomposition of estuarine dissolved organic C, N and P and bacterial metabolism

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