Bacterial activities in shallow lakes – a comparison between extremely acidic and alkaline eutrophic hard water lakes

Nixdorf, Brigitte; Jander, Jörn

doi:10.1023/b:hydr.0000008623.73250.c8

Cited by 30 publications

(17 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured concentrations of up to 7 mg L −1 in soil solution are similar to those of mineral soils in temperate grasslands and forests (Fahey et al, 2005;Nambu et al, 2008;Sanderman et al, 2008;Tipping et al, 2012). Likewise, DOC concentrations in ground water, surface waters and subsurface water with up to 20 mg DOC L −1 are similar to, or even higher than, those of mature ecosystems, including streams (Ziegler andBrisco, 2004), lakes (Pace andCole, 2002;Steinberg, 2003;Berggren et al, 2009), and forest and grassland catchments (e.g., Hagedorn et al, 2000). Radiocarbon ages of the C in the Quaternary substrate and groundwater DOC indicate that the Quaternary substrate contributed about 40 to 90 % to the DOC in the ground water of the Chicken Creek Catchment.…”

Section: Discussionsupporting

confidence: 61%

“…Bacteria from 70 day old biofilms were scraped off the glass slides with a scalpel, suspended in 25 mL autoclaved, particle-free water, and preserved with formaldehyde as above. Aliquots of 0.5 to 2 mL were concentrated on black polycarbonate membranes (0.2 µm pore size; Sartorius, Göttingen, Germany), stained with DAPI (4 6-diamidino-2-phenylindol, final concentration of 1 µg mL −1 ) as described in Nixdorf et al (2003), and counted by epifluorescence microscopy. Microbial respiration and DOC concentrations were determined in the four filtered water types, after 1 (microbial respiration only), 7, 14, 42 and 70 days of incubation.…”

Section: Analyses Of Bacterial Abundance Respiration and Docmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics, chemical properties and bioavailability of DOC in an early successional catchment

Risse‐Buhl

Hagedorn

Dümig³

et al. 2013

Biogeosciences

View full text Add to dashboard Cite

Abstract. The dynamics of dissolved organic carbon (DOC) have been intensively studied in mature ecosystems, but little is known about DOC dynamics and the significance of DOC as a substrate for microbial activity in early-successional catchments. We determined the concentration, chemical composition, source, radiocarbon age, and bioavailability of DOC along the hydrological flow path from soil solution to a downstream pond in a recently constructed catchment (Chicken Creek Catchment, Germany). Soil solution, upwelling ground water, stream water, subsurface water in an alluvial fan, and pond water all had high DOC concentrations (averages: 6.0–11.6 mg DOC L–1), despite small carbon stocks in both vegetation and soil of the catchment. Solid-state CPMAS 13C NMR of DOC in upwelling ground water revealed a higher proportion of aromatic compounds (32%) and a lower proportion of carbohydrates (33%) than in pond water (18% and 45%, respectively). The average 14C age of DOC in upwelling ground water was 2600 to 2900 yr, while organic matter of the Quaternary substrate of the catchment had a 14C age of 3000 to 16 000 yr. Both the 14C age data and 13C NMR spectra suggest that DOC partly derived from organic matter of the Quaternary substrate (about 40 to 90% of the C in the DOC), indicating that both recent and old C of the DOC can support microbial activity during early ecosystem succession. However, in a 70 day incubation experiment, only about 11% of the total DOC was found to be bioavailable. This proportion was irrespective of the water type. Origin of the microbial communities within the catchment (enriched from soil, stream sediment or pond water) also had only a marginal effect on overall DOC utilization.

show abstract

Section: Discussionsupporting

confidence: 61%

Section: Analyses Of Bacterial Abundance Respiration and Docmentioning

confidence: 99%

Dynamics, chemical properties and bioavailability of DOC in an early successional catchment

Risse‐Buhl

Hagedorn

Dümig³

et al. 2013

Biogeosciences

View full text Add to dashboard Cite

show abstract

“…3 d occur (Mischke 2003). Due to its shallowness and a long-lasting eutrophication problem (Rücker et al 1997), Langer See is hypertrophic, enriched in nutrients, and exhibiting a high bacterial (Nixdorf and Jander 2003) and phytoplankton production in winter and summer (Nixdorf and Rü cker 2006), which all restricts macrophyte growth.…”

Section: Methodsmentioning

confidence: 99%

Effects of ice cover on sediment resuspension and phosphorus entrainment in shallow lakes: Combining in situ experiments and wind‐wave modeling

Kleeberg

Freidank

Joehnk

2013

Limnology & Oceanography

View full text Add to dashboard Cite

In situ experiments on sediment resuspension were carried out along a depth transect in shallow polytrophic Lake Langer See, northeast Germany (area 5 1.27 km 2 , Z max 5 3.8 m), in winter under ice and in summer 2006, using a hydrodynamically calibrated erosion chamber (diameter 20 cm). Shear velocity U * was incrementally increased 11 times for 10 min each (0-2.57 cm s 21 ) to initiate resuspension. Entrainment rates (E) of suspended particulate matter (E SPM ) and total P (E TP ) were determined by a mass balance. Sandy nearshore sediments at 1-2 m depth showed low E SPM (0.01-6.64 g m 22 h 21 ) and E TP (0.2-2.96 mg m 22 h 21 ). There was no difference in critical shear velocity (U * crit ) of incipient resuspension between winter and summer. Muddy offshore sediments at 2-3.8 m depth showed higher E SPM (0.09-106.1 g m 22 h 21 ) and E TP (0.06-532.3 mg m 22 h 21 ). Under ice, U * crit was 0.9-1.1 cm s 21 higher than in summer, indicating that the wave-unaffected sediment had ample time for consolidation and biostabilization. Wind-wave modeling, using measured E SPM and E TP , revealed that resuspension is primarily (90%) restricted to the nearshore sediments (17% lake area). Our scenarios show that annual entrainment of SPM and TP increased linearly with the duration of ice-free period. Since ice coverage increased shear resistance, climate-driven absence or shortening of ice-cover would reduce the period for settling of particles and their integration into sediments, lowering their biostabilization, thus facilitating resuspension and phytoplankton recruitment in spring after ice thaw.Shallow lakes, without aquatic macrophytes, often demonstrate enhanced sediment resuspension induced by wind and/or benthic fishes. Particles are resuspended from the bottom if a critical shear stress of erosion is exceeded, leading to sediment-related water quality problems such as reduced water clarity, enhanced nutrient cycling, and high phytoplankton biomass (Bloesch 1995).Due to wind-driven resuspension, considerable quantities of particulate and interstitial phosphorus (P) can be entrained and distributed into the water column. At any given time, this physical upward transport of P may be orders of magnitude greater than other P inputs, from external or internal loading, including diffusion and bioturbation (Havens et al. 2007). However, resuspension may be not only a source (Reddy et al. 1996) but also a sink (Havens et al. 2007), or has no effect on water column P concentration (Peters and Cattaneo 1984). Hence, resuspension needs to be studied, particularly in lakes subject to wind and associated wave-current interactions with the lake bed.Because of its growth-stimulating effect on phytoplankton, P resuspension in shallow lakes was quantified by quite different approaches. There are numerous whole lake studies (Istvá novics et al. 2004;Havens et al. 2007), enclosure experiments (Ogilvie and Mitchell 1998), combinations of in situ and laboratory experiments (Qin et al. 2004), and exclusively laboratory experime...

show abstract

“…We diluted 5 mL of the subsample and placed it in an ultrasonic bath to extract bacteria (40% of the maximum power, 2 periods each of 2 min; Gó mez et al 2009). We used 4,6-di-amidino-2-phenylindole (DAPI) staining to estimate bacterial abundance in a separate 5-mL sediment subsample (Nixdorf and Jander 2003). We scanned filters under an epifluorescence microscope (Axioskop Zeiss 1000X; Zeiss, Jena, Germany) following the same procedure as for algae.…”

Section: Sediment Microbial Community-associated Variablesmentioning

confidence: 99%

Microbial activity and sediment disturbance modulate the vertical water flux in sandy sediments

Mendoza‐Lera¹,

Mutz

2013

Freshwater Science

View full text Add to dashboard Cite

Little research has been conducted on the influence of microbial communities, sediment disturbances, and their interaction on the Vertical Water Flux (VWF) across a hydraulically complex streambed. Our study was aimed at the effects of microbial activity and shallow-sediment disturbance on VWF in sandbed flumes. We assessed the dynamics of VWF and the development of a microbial community during 30 d (June-July 2010) in 16 outdoor flumes with 2 types of bedform shape (level and ripple). We operated 8 flumes in constant darkness (no-light), and 8 in daylight to gain information on the relative significance of algae and heterotrophic microorganisms. We simulated a shallow-sediment disturbance after 21 d and compared microbial activity and VWF before and after the disturbance. We measured organic matter content, abundance of organisms, microbial activity, precipitation of CaCO 3 , and O 2 bubbles resulting from primary production before and after the disturbance. VWF differed among treatments after 13 d. Algal and bacterial cells embedded in an extracellular polymer network, algal and microbial precipitation of CaCO 3 , and production of O 2 bubbles in the uppermost sediment blocked the sediment pore space and disrupted VWF under daylight conditions, whereas bacterial cells and microbial precipitation of CaCO 3 reduced VWF in no-light flumes. Microbial activity and organic matter were not affected by the shallow-sediment disturbance, but VWF was restored. VWF can be controlled by microbial activity and shallow-sediment disturbances and should be seen as spatially heterogeneous and fluctuating in time on small scales.

show abstract

Bacterial activities in shallow lakes – a comparison between extremely acidic and alkaline eutrophic hard water lakes

Cited by 30 publications

References 27 publications

Dynamics, chemical properties and bioavailability of DOC in an early successional catchment

Dynamics, chemical properties and bioavailability of DOC in an early successional catchment

Effects of ice cover on sediment resuspension and phosphorus entrainment in shallow lakes: Combining in situ experiments and wind‐wave modeling

Microbial activity and sediment disturbance modulate the vertical water flux in sandy sediments

Contact Info

Product

Resources

About