Dissolved Carbohydrate Concentration, Composition, and Bioavailability to Microbial Heterotrophs in Stream Water

Gremm, Th. J.; Kaplan, L. A.

doi:10.1002/(sici)1521-401x(199805)26:3<167::aid-aheh167>3.3.co;2-h

Cited by 10 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides quantity, a high-flow event can affect the composition of DOM (Gremm and Kaplan, 1998;Hood et al, 2006;Zhang et al, 2007;Spencer et al, 2008), which is a result of mobilization of different terrestrial DOM pools that are not available under base flow conditions (Vidon et al, 2008;Fellman et al, 2009;Osburn et al, 2019). The appearance of a group of new compounds under high flow is consistent with this idea (Figure 2B).…”

Section: Impact Of Storm Events On Riverine Domsupporting

confidence: 66%

“…A meta-analysis of 30 small eastern United States forested watersheds showed a power-law relationship between DOC concentration and discharges, with 86% of DOC exported during hydrologic events (Raymond and Saiers, 2010). Also acknowledged is that the increase in stream water DOM concentration during high-flow events is generally concurrent with a change in the DOM composition (Gremm and Kaplan, 1998;Hood et al, 2006;Zhang et al, 2007;Spencer et al, 2008). This shift is a result of mobilization of a different terrestrial DOM pool, which is not available under base flow scenarios (Vidon et al, 2008;Fellman et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular Level Analysis Reveals Changes in Chemical Composition of Dissolved Organic Matter From South Texas Rivers After High Flow Events

Liu

2019

Front. Mar. Sci.

View full text Add to dashboard Cite

Section: Impact Of Storm Events On Riverine Domsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Molecular Level Analysis Reveals Changes in Chemical Composition of Dissolved Organic Matter From South Texas Rivers After High Flow Events

Liu

2019

Front. Mar. Sci.

View full text Add to dashboard Cite

“…The increase in stream water DOM associated with high‐flow events is typically coupled with a change in the quality of DOM [ Gremm and Kaplan , 1998; Hood et al , 2006; Zhang et al , 2007]. This shift in the chemical quality of DOM can occur because terrestrial DOM source pools mobilized during high flows differ from those leached during base flows.…”

Section: Introductionmentioning

confidence: 99%

Changes in the concentration, biodegradability, and fluorescent properties of dissolved organic matter during stormflows in coastal temperate watersheds

et al. 2009

View full text Add to dashboard Cite

[1] Dissolved organic matter (DOM) transport during storms is studied because it is important in the annual watershed export budget for dissolved organic carbon (DOC). We sampled stream water from two watersheds (upland and wetland-dominated) and three subcatchments (bog, forested wetland, and mineral forest) located within the wetland-dominated watershed during a fall and summer storm to investigate changes in the magnitude and chemical quality of DOM during stormflows. Stormflow export of DOC ranged from 2.3 kg C ha À1 in the upland watershed to 13.9 kg C ha À1 in the bog subcatchment. Biodegradable DOC (BDOC) export for these same storms ranged from 0.6 kg C ha À1 in the upland watershed to 4.2 kg C ha À1 in the bog subcatchment. The percent BDOC decreased during both storms in the upland watershed, while percent BDOC increased in the three wetland streams. Parallel factor analysis (PARAFAC) modeling of fluorescence excitation-emission matrices further showed that as stream water DOM concentrations increased during stormflows in the upland watershed, the contribution of protein-like fluorescence decreased and humic-like fluorescence increased. However, the contribution of protein-like fluorescence increased and humic-like fluorescence decreased slightly in the three wetland streams. These results indicate that shifts in the biodegradability and chemical quality of DOM are different for upland and wetland watersheds. Taken together, our findings suggest stormflows are responsible for substantial export of BDOC from coastal temperate watersheds. Moreover, we found that PARAFAC modeling of fluorescent DOM is an effective tool for elucidating shifts in the quality of stream water DOM during storms.

show abstract

“…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. Many variables that directly influence stream microbiota have not been circumscribed.…”

mentioning

confidence: 99%

Recurring Seasonal Dynamics of Microbial Communities in Stream Habitats

Hullar

Kaplan

Stahl

2006

Appl Environ Microbiol

161

128

View full text Add to dashboard Cite

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...

show abstract

Dissolved Carbohydrate Concentration, Composition, and Bioavailability to Microbial Heterotrophs in Stream Water

Cited by 10 publications

References 0 publications

Molecular Level Analysis Reveals Changes in Chemical Composition of Dissolved Organic Matter From South Texas Rivers After High Flow Events

Molecular Level Analysis Reveals Changes in Chemical Composition of Dissolved Organic Matter From South Texas Rivers After High Flow Events

Changes in the concentration, biodegradability, and fluorescent properties of dissolved organic matter during stormflows in coastal temperate watersheds

Recurring Seasonal Dynamics of Microbial Communities in Stream Habitats

Contact Info

Product

Resources

About