Growth and losses of phytoplankton studied with a new dialysis chamber technique along the river Spree

Köhler, Jan; Bosse, S.

doi:10.1127/archiv-hydrobiol/142/1998/1

Cited by 5 publications

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“…data), but may have been lower in 1997/98 because of denser growth of macrophytes. The retention of in situ pelagic primary production amounted to 0.77 g C m −2 day −1 in spring and 0.47 g C m −2 day −1 in summer 1995 (Köhler & Bosse, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…All the organic carbon fluxes mentioned above exhibit pulses during specific seasons or hydrological events. Algal production and losses of algal biomass are highest during spring (Köhler & Bosse, 1998), whereas autochthonous CPOM from macrophytes and allochthonous CPOM from leaves are more available in autumn. The availability of allochthonous DOC for the bacterial community might change as a result of alterations in discharge and precipitation.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, in its middle and lower sections, the Spree is a typical lowland river rich in seston and phytoplankton, with sandy sediments in the main channel. Losses of phytoplankton in this river stretch are high (Köhler & Bosse, 1998) because of turbulence (Sukhodolov, Thiele & Bungartz, 1998), sedimentation (Wanner & Pusch, 2000) and mussel filtration (Pusch, Siefert & Walz, 2001).…”

Section: Methodsmentioning

confidence: 99%

“…The phytoplankton supplied by lakes and reservoirs keeps growing within the free‐flowing river sections, especially during spring (Köhler, 1994; Köhler & Bosse, 1998). Primary production of 0.9 g C m 2 day −1 (seasonal mean 1993–95; J. Köhler unpubl.…”

Section: Methodsmentioning

confidence: 99%

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Comparison of bacterial production in sediments, epiphyton and the pelagic zone of a lowland river

Fischer

2001

Freshwater Biology

124

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1. The microbial metabolism of organic matter in rivers has received little study compared with that of small streams. Therefore, we investigated the rate and location of bacterial production in a sixth‐order lowland river (Spree, Germany). To estimate the contribution of various habitats (sediments, epiphyton, and the pelagic zone) to total bacterial production, we quantified the contribution of these habitats to areal production by bacteria. 2. Large areas of the river bottom were characterized by loose and shifting sands of relatively homogenous particle size distribution. Aquatic macrophytes grew on 40% of the river bottom. Leaf areas of 2.8 m2 m−2 river bottom were found in a 6.6 km river stretch. 3. The epiphyton supported a bacterial production of 5–58 ng C cm−2 h−1. Bacterial production in the pelagic zone was 0.9–3.9 μg C L−1 h−1, and abundance was 4.0–7.8 × 109 cells L−1. Bacterial production in the uppermost 2 cm of sediments ranged from 1 to 8 μg C cm−3 h−1, and abundance from 0.84 to 6.7 × 109 cells cm−3. Bacteria were larger and more active in sediments than in the pelagic zone. 4. In spite of relatively low macrophyte abundance, areal production by bacteria in the pelagic zone was only slightly higher than in the epiphyton. Bacterial biomass in the uppermost 2 cm of sediments exceeded pelagic biomass by factors of 6–22, and sedimentary bacterial production was 17–35 times higher than in the overlying water column. 5. On a square meter basis, total bacterial production in the Spree was clearly higher than primary productivity. Thus, the lowland river Spree is a heterotrophic system with benthic processes dominating. Therefore, sedimentary and epiphytic bacterial productivity form important components of ecosystem carbon metabolism in rivers and shallow lakes. 6. The sediments are focal sites of microbial degradation of organic carbon in a sand‐bottomed lowland river. The presence of a lowland river section within a river continuum probably greatly changes the geochemical fluxes within the river network. This implies that current concepts of longitudinal biogeochemical relationships within river systems have to be revised.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Comparison of bacterial production in sediments, epiphyton and the pelagic zone of a lowland river

Fischer

2001

Freshwater Biology

124

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Growth and Loss Processes of Riverine Phytoplankton in Relation to Water Depth

Köhler

Bahnwart

Ockenfeld

2002

Internat. Rev. Hydrobiol.

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An Incubator for the Simulation of a Fluctuating Light Climate in Studies of Planktonic Primary Productivity

Gervais

Hintze

Behrendt

1999

International Review of Hydrobiology

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A laboratory system for the quantification of phytoplankton photosynthesis under fluctuating light climate conditions is described. It consists of 2 temperature‐controlled incubators with a variable light supply, an algal batch culture in incubation bottles with appropriate stirrers and a set of oxygen electrodes to monitor algal photosynthesis. By the rotation of special grey filters between the incubator and the light source, a regular up and down movement in the water column is simulated in up to 7 parallel bottles. Different ratios of euphotic depth to mixing depth and different velocities can be applied. Simultaneously, 8 bottles can be incubated under constant light. The system is demonstrated in experiments with Chlamydomonas sp. Further possibilities of application are proposed.

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Growth and losses of phytoplankton studied with a new dialysis chamber technique along the river Spree

Cited by 5 publications

References 0 publications

Comparison of bacterial production in sediments, epiphyton and the pelagic zone of a lowland river

Comparison of bacterial production in sediments, epiphyton and the pelagic zone of a lowland river

Growth and Loss Processes of Riverine Phytoplankton in Relation to Water Depth

An Incubator for the Simulation of a Fluctuating Light Climate in Studies of Planktonic Primary Productivity

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