The role of mesoscale hydrography on microbial dynamics in the northeast Atlantic: Results of a spring bloom experiment

Karrasch, Bernhard; Höppe, Henning A.; Ullrich, S.; Podewski, Sigrid

doi:10.1357/0022240963213420

Cited by 21 publications

(16 citation statements)

References 51 publications

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“…Consequently, higher concentrations of the phytoplankton groups matched with lower concentrations of bacterioplankton groups as exhibited, for example, in R3 which was enriched with coccolithophores (Table 3). Similar patterns were observed previously and their origin was attributed to a mesoscale hydrographic variability (Karrasch et al 1996). Many factors, such as origin of hydrographic structures, their specific physical parameters and history must be considered in order to explain and to understand their biological constitution at the moment of observation (Le Groupe Tourbillon 1983).…”

Section: Discussionsupporting

confidence: 76%

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Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Zubkov

Fuchs

Tarran³

et al. 2002

Aquat. Microb. Ecol.

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Section: Discussionsupporting

confidence: 76%

“…Supported by the mesoscale hydrographic structures, patches dominated by phytoplankton and bacterioplankton were observed simultaneously (Karrasch et al 1996). The spatial and temporal intermittency of turbulent stirring generates such patchiness (Abraham 1998) and poses a complex sampling problem.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Zubkov

Fuchs

Tarran³

et al. 2002

Aquat. Microb. Ecol.

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“…Losses due to algal respiration -generally estimated to be in the range of 10% (cf. Karrasch et al 1996) -were not considered.…”

Section: Balance Of Production and Decompositionmentioning

confidence: 99%

Tidal impact on planktonic primary and bacterial production in the German Wadden Sea

Poremba¹,

Tillmann²,

Hesse³

1999

Helgol Mar Res

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Tidal variation of biological parameters was studied at three anchor stations in selected inlet channels of the northern German Wadden Sea in May and July 1994. Concentrations of bacteria, chlorophyll a and suspended matter as well as primary and bacterial production were assessed over a period of 25 h in the surface and in the bottom water. Diurnal variation in primary production was found both under in situ light conditions and under constant illumination. Tidal turbulence caused the introduction of detritus, bacteria and pigments from the sediment into the water column. The impact of sediment resuspension was most evident in the bottom water, leading to tidally oscillating bacterial production rates which were high during high stream velocity and low during the slack times. Estimations of the areal daily phytoplankton production and corresponding bacterial carbon demands were unbalanced. Primary production accounted for only 25-45% of the total bacterial carbon requirement. This discrepancy is due to the shallow euphotic depth in the Wadden Sea, allowing net primary production only in the upper 2-3 m of the water column, while the relatively high levels of bacterial activity do not show a vertical decline. Assuming that the specific biological activities in the water columns over the tidal flats are similar to those found in the inlet channels, it was found that production processes dominate in shallow areas whereas decomposition processes dominate in the deep channels. Moreover, the predominance of heterotrophic processes in the inlet channels means that additional organic carbon sources must contribute to the heterotrophic metabolism in the deep parts of the Wadden Sea, and that the horizontal flux of material is important in this turbid mesotidal ecosystem.

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“…Studies in EBCS have reported an exchange of chemical and biological properties between coastal and oceanic waters associated with the propagation of mesoscale eddies, e.g., [28][29][30][31]. Most of these studies are based on total Chl-a, and only a few have analyzed phytoplankton community structure within mesoscale eddies or other submesoscale features, e.g., [32][33][34][35]. The later, however, are restricted in space and time, mainly due to the difficulty in obtaining high-resolution, in situ data associated with the complete trajectory of eddies.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton Size Structure in Association with Mesoscale Eddies off Central-Southern Chile: The Satellite Application of a Phytoplankton Size-Class Model

et al. 2018

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Understanding the influence of mesoscale and submesoscale features on the structure of phytoplankton is a key aspect in the assessment of their influence on marine biogeochemical cycling and cross-shore exchanges of plankton in Eastern Boundary Current Systems (EBCS). In this study, the spatio-temporal evolution of phytoplankton size classes (PSC) in surface waters associated with mesoscale eddies in the EBCS off central-southern Chile was analyzed. Chlorophyll-a (Chl-a) size-fractionated filtration (SFF) data from in situ samplings in coastal and coastal transition waters were used to tune a three-component (micro-, nano-, and pico-phytoplankton) model, which was then applied to total Chl-a satellite data (ESA OC-CCI product) in order to retrieve the Chl-a concentration of each PSC. A sea surface, height-based eddy-tracking algorithm was used to identify and track one cyclonic (sC) and three anticyclonic (ssAC1, ssAC2, sAC) mesoscale eddies between January 2014 and October 2015. Satellite estimates of PSC and in situ SFF Chl-a data were highly correlated (0.64 < r < 0.87), although uncertainty values for the microplankton fraction were moderate to high (50 to 100% depending on the metric used). The largest changes in size structure took place during the early life of eddies (~2 months), and no major differences in PSC between eddy center and periphery were found. The contribution of the microplankton fraction was~50% (~30%) in sC and ssAC1 (ssAC2 and sAC) eddies when they were located close to the coast, while nanoplankton was dominant (~60-70%) and picoplankton almost constant (<20%) throughout the lifetime of eddies. These results suggest that the three-component model, which has been mostly applied in oceanic waters, is also applicable to highly productive coastal upwelling systems. Additionally, the PSC changes within mesoscale eddies obtained by this satellite approach are in agreement with results on phytoplankton size distribution

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The role of mesoscale hydrography on microbial dynamics in the northeast Atlantic: Results of a spring bloom experiment

Cited by 21 publications

References 51 publications

Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Tidal impact on planktonic primary and bacterial production in the German Wadden Sea

Phytoplankton Size Structure in Association with Mesoscale Eddies off Central-Southern Chile: The Satellite Application of a Phytoplankton Size-Class Model

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