Spatial and temporal variability of absorption by dissolved material at a continental shelf

Boss, Emmanuel; Pegau, W. Scott; Zaneveld, J. Ronald V.; Barnard, Andrew H.

doi:10.1029/2000jc900008

Cited by 121 publications

(74 citation statements)

References 20 publications

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“…However, the qPCR data also indicated higher abundance of AAP bacteria in waters with higher light attenuation. Light attenuation is due to a combination of factors, including the presence of colored dissolved organic matter (9,11) and suspended particles (6,7). In the Baltic, bChl a and colored dissolved organic matter concentrations were positively correlated (26), suggesting an inverse relationship of AAP bacterial abundance with light.…”

Section: Discussionmentioning

confidence: 99%

Aerobic Anoxygenic Phototrophic Bacteria Attached to Particles in Turbid Waters of the Delaware and Chesapeake Estuaries

Waidner

Kirchman

2007

Appl Environ Microbiol

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Aerobic anoxygenic phototrophic (AAP) bacteria are photoheterotrophs that, if abundant, may be biogeochemically important in the oceans. We used epifluorescence microscopy and quantitative PCR (qPCR) to examine the abundance of these bacteria by enumerating cells with bacteriochlorophyll a (bChl a) and the light-reaction center gene pufM, respectively. In the surface waters of the Delaware estuary, AAP bacteria were abundant, comprising up to 34% of prokaryotes, although the percentage varied greatly with location and season. On average, AAP bacteria made up 12% of the community as measured by microscopy and 17% by qPCR. In the surface waters of the Chesapeake, AAP bacteria were less abundant, averaging 6% of prokaryotes. AAP bacterial abundance was significantly correlated with light attenuation (r ‫؍‬ 0.50) and ammonium (r ‫؍‬ 0.42) and nitrate (r ‫؍‬ 0.71) concentrations. Often, bChl a-containing bacteria were mostly attached to particles (31 to 94% of total AAP bacteria), while usually 20% or less of total prokaryotes were associated with particles. Of the cells containing pufM, up to 87% were associated with particles, but the overall average of particleattached cells was 15%. These data suggest that AAP bacteria are particularly competitive in these two estuaries, in part due to attachment to particles.Recent studies indicate that photoheterotrophic bacteria, which are capable of both phototrophy and heterotrophy, may be abundant and important in biogeochemical cycles of the oceans (3,23,28). One type of photoheterotroph, aerobic anoxygenic phototrophic (AAP) bacteria, can harvest light by use of bacteriochlorophyll a (bChl a) for the production of ATP (45). Phototrophy explains the higher growth rates (46) and viability (40) of these bacteria grown in the light compared with the results seen with dark-grown cultures. Some AAP bacteria reduce the production of photosynthetic pigments in response to higher organic carbon concentrations (27,40). These data suggest that AAP bacteria would have competitive advantages over typical heterotrophs when organic carbon concentrations are low (23).This hypothesis was supported by the discovery of AAP bacteria in the open ocean (28), where AAP bacteria can make up from Ͻ1% to 10% of the prokaryotic community (13, 18, 37). However, emerging evidence indicates that these bacteria may be as abundant in eutrophic as in oligotrophic environments (13,37,39). A global survey of bacteria containing bChl a and the reaction center pufM gene found that AAP bacteria were more abundant in the Long Island Sound and Chesapeake Bay than in the open ocean (37). Additionally, these bacteria were more abundant in the North Atlantic Ocean, where chlorophyll concentrations were higher, than in the North Pacific, where AAP bacteria comprised less than 5% of prokaryotes (13). These wide ranges suggest that more data on the abundance of AAP bacteria are needed to determine the ecological controls of these bacteria.To explore what environmental factors control AAP bacteria, we enumerated cells...

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Section: Discussionmentioning

confidence: 99%

Aerobic Anoxygenic Phototrophic Bacteria Attached to Particles in Turbid Waters of the Delaware and Chesapeake Estuaries

Waidner

Kirchman

2007

Appl Environ Microbiol

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“…CDOM in the Ems (at 440 nm) was found to absorb over 2 m ¡1 , while the median absorption over the Wadden Sea area in spring, summer and autumn was 0.64 m ¡1 (Table 1) (Hommersom et al 2009). In the shallow Wadden Sea, pore water adds to the CDOM concentration Boss et al 2001;Laane and Kramer 1990), while sand beds were found to work as a sink for organic matter that can Wlter the entire water body of the Wadden Sea within 3-10 days (De Beer et al 2005). Still, maps of CDOM concentrations over the entire Wadden Sea area as in Hommersom et al (2009) are sparse.…”

Section: ¡1mentioning

confidence: 99%

A review on substances and processes relevant for optical remote sensing of extremely turbid marine areas, with a focus on the Wadden Sea

et al. 2010

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The interpretation of optical remote sensing data of estuaries and tidal Xat areas is hampered by optical complexity and often extreme turbidity. Extremely high concentrations of suspended matter, chlorophyll and dissolved organic matter, local diVerences, seasonal and tidal variations and resuspension are important factors inXuencing the optical properties in such areas. This review gives an overview of the processes in estuaries and tidal Xat areas and the implications of these for remote sensing in such areas, using the Wadden Sea as a case study area. Results show that remote sensing research in extremely turbid estuaries and tidal areas is possible. However, this requires sensors with a large ground resolution, algorithms tuned for high concentrations of various substances and the local speciWc optical properties of these substances, a simultaneous detection of water colour and land-water boundaries, a very short time lag between acquisition of remote sensing and in situ data used for validation and suYcient geophysical and ecological knowledge of the area.

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“…On local scales, in situ production from phytoplankton decomposition and extraction from bottom sediments may be an important source of CDOM (Twardowski and Donaghay, 2001;Boss et al, 2001). However, in their studies, Rochelle-Newall and Fisher (2002 a) showed that CDOM absorption doesn't correlate with chlorophyll_a content.…”

Section: Post-monsoonmentioning

confidence: 99%

Dynamics of chromophoric dissolved organic matter in Mandovi and Zuari estuaries — A study through in situ and satellite data

Menon

Sangekar

Lotliker

et al. 2011

ISPRS Journal of Photogrammetry and Remote Sensing

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The spatial and temporal distribution of absorption of chromophoric dissolved organic matter at 440 nm (a CDOM (440)) in Mandovi and Zuari estuaries situated along the west coast of India, has been analyzed. The study was carried out using remotely sensed data, obtained from the Ocean Colour Monitor (OCM) on board the Indian Remote Sensing satellite -P4, together with in situ data during the period January to December 2005. Satellite retrieval of CDOM absorption was carried out by applying an algorithm developed for the site. A good correlation (R = 0.98) was obtained between satellite derived CDOM and in situ data. Time series analysis revealed that spatial distribution of CDOM has a direct link with the seasonal hydrodynamics of the estuaries. The effect of remnant fresh water on CDOM distribution could be analyzed by delineating a plume in the offshore region of Zuari estuary. Though fresh water flux from terrestrial input plays a major role in the distribution of CDOM through out Mandovi estuary, its role in Zuari estuary is significant up to the middle zone.Other processes responsible for feeding CDOM in both the estuaries are coastal advection, in situ production and resuspension of bottom settled sediments. The highest value of a CDOM (440)

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Spatial and temporal variability of absorption by dissolved material at a continental shelf

Cited by 121 publications

References 20 publications

Aerobic Anoxygenic Phototrophic Bacteria Attached to Particles in Turbid Waters of the Delaware and Chesapeake Estuaries

Aerobic Anoxygenic Phototrophic Bacteria Attached to Particles in Turbid Waters of the Delaware and Chesapeake Estuaries

A review on substances and processes relevant for optical remote sensing of extremely turbid marine areas, with a focus on the Wadden Sea

Dynamics of chromophoric dissolved organic matter in Mandovi and Zuari estuaries — A study through in situ and satellite data

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