Eutrophication and Restoration Measures in the Darß‐Zingst Bodden Chain

Nausch, Günther; Schlungbaum, G.

doi:10.1002/iroh.19910760317

Cited by 21 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The salinity gradient ranges from 9 to 10 at the outlet to the Baltic Sea to < 5 in the inner part, which receives a significant input of fresh water (Schlungbaum et al 1994). Like the Nordriigen- sche Bodden, the Darss-Zingst Bodden also show a gradual increase in trophic state from the outer towards the inner parts (Nausch & Schlungbaum 1991). Pigment excitation spectra (excitation at 400 to 630 nm, emission at 685 nm) of Kirr-Bucht samples showed no differences in pigment conlposition between water column and sediment samples, indicating that the sediment surface at Kirr-Bucht was mainly covered by sedirnented planktonic algae (chlorophytes, cyanobacteria).…”

Section: Methodsmentioning

confidence: 95%

Significance of pelagic and benthic primary production in two shallow coastal lagoons of different degrees of eutrophication in the southern Baltic Sea

Meyercordt¹,

Gerbersdorf²,

Meyer‐Reil³

1999

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Primary production by pelagic and benthic rnicroalgae was measured in 2 shallow coastal lagoons in the southern Baltlc Sea by in situ and laboratory incubations to quantify the significance of these 2 malor groups of primary producers in absolute and relative terms. Pelagc primary production rates per volume at saturating hght conditions were 7 to 12 times higher at the polytrophic location KirrBucht (Darss-Zingst Bodden) than at the meso-/eutrophic location Rassower Strom (Nordriigensche Bodden). Chlorophyll a specific primary production rates, however, were in the same range at both locations, except for 1 situation in spnng which is exphcitly discussed. The pelagic chlorophyll a specific maxin~unl light utilization coefficient ( a ' ) tended towards higher values in Kirr-Bucht samples, which can be interpreted as an adaptation to a lower supply of irradiance. Pelagic and benthic primary production varied seasonally, with highest rates occurring in June/July. A calculation of short-term variability due to cloud-modulated avadabllitv of irradiance revealed reductions of pelaqic and benthic gross production (GP) rates on overcast days, compared to bright days, in the range of 26 to 69% and 62 to 82 "C,, respectively. Net community production (NP) rates were more severely reduced than GP rates on overcast days. Benthic NP was generally reduced to below zero on overcast days, whereas it was nlostly positive on bright days at both locations. To evaluate the significance of the different optical properties of both types of water (diffuse vertical attenuation coefficient, k = 3.3 to 3.7 and 0.5 to 0.7 m-' at Kirr-Bucht and Rassower Strom, respectively) for pnrnary production, the benthic and pelagic contributions at both sites were calculated regarding a water depth of 2 m, which is about the mean depth of the Bodden systems This standardization revealed obvious differences in basic conditions for primary production which remained undetected when the comparison of the 2 sites was based on the water depths in which the in situ incubations had been carried out (0.6 and 3.4 m at Kirr-Bucht and Rassower Strom, respectively) In meso-/eutrophic Rassower Strom at a depth of 2 m, benthic GP would contribute about 30 to 45% to the total GP of microalgae, depending on weather conditions and seasons. At the same depth in polytrophic Kirr-Bucht, the microalgae on the sediment surface would account for only 0 3 % or less of total GP. This demonstrates that optical properties of the water, which are closely related to the trophic state of the system, exert strong control on varying proportions of productivity, attributable to planktonic versus benthic nlicroalgal communities. It can be concluded from the modeled data that the difference between both locations will be most prominent dunng periods of low supply of radlant energy, Like on overcast days.

show abstract

Section: Methodsmentioning

confidence: 95%

Significance of pelagic and benthic primary production in two shallow coastal lagoons of different degrees of eutrophication in the southern Baltic Sea

Meyercordt¹,

Gerbersdorf²,

Meyer‐Reil³

1999

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

show abstract

“…The salinity gradient ranges from 9 to 10 at the outlet to the Baltic Sea to <5 in the inner part, with a significant input of fresh water (Schlungbaum et al 1994). Like the Nordriigensche Bodden, the DarssZingst Bodden show a gradual increase in eutrophication towards the inner parts (Nausch & Schlungbaum 1991). Hydrographical and hydrochemical data, as well as sediment characteristics of Kirr-Bucht and Rassower Strom, are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Primary production of benthic microalgae in two shallow coastal lagoons of different trophic status in the southern Baltic Sea

Meyercordt¹,

Meyer‐Reil²

1999

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Primary production of undisturbed sediments, taken from 2 shallow coastal lagoons in the southern Baltic Sea, was measured in situ and in the laboratory. In the highly eutrophicated and turbid water (mean attenuation coefficient = 2.97 m-') of Kirr-Bucht (Darss-Zingster Bodden), chlorophyll a concentrations were about 8 times higher than at moderately eutrophicated (mean attenuation coefficient = 0.66 m-') Rassower Strom (Nordrugensche Bodden). The difference between the 2 areas in terms of chlorophyll a concentrations of the sediment was smaller (only about 2.5 times higher at f i rBucht). Sediment oxygen consumption rates were slmilar at both sampling stations, showing a marked seasonal trend. Hourly rates of gross production, measured by in situ incubations, revealed maximal values of 30.0 and 17.6 mg C m-2 h-' for sediments of Kirr-Bucht and Rassower Strom, respectively. Agreement between production rates measured in situ and in laboratory incubations was acceptable (R2 = 0.833). Irradiance dependency of gross production could be well described by 2 parameters, a (slope of light-saturation curve at low irradiance) and P, (photosynthetic capacity), of a photosynthesis model. Calculated annual rates for Kirr-Bucht (0.6 m water depth) were 60 g C m-2 yr-' for gross production and 5 g C m-' y r ' for net production. For Rassower Strom (3.4 m water depth). 23 g C m-' yr-' for gross production and -31 g C m-2 yr-' for net production were calculated. If production rates were extrapolated to irradiance conditions at comparable water depths at both sampling locations (e.g. 1 m), the detrunental effect of the eutrophicated water column of Kirr-Bucht on benthic primary production became evident in the gross production rates (Irr-Bucht: 25 g C m-2 y f ', Rassower Strom: 51 g C m-2 yr-l) and was even more significant for the net production rates (Kirr-Bucht: -30 g C m-' yr-', Rassower Strom: -3 g C m-2 yr-'). At a depth of 1 m, a much higher deficit in the carbon balance for the benthic system of firr-Bucht was calculated than for Rassower Strom. Therefore, benthic community respiration at the highly eutrophicated location could not by a large margin be balanced by authochthonous benthic primary production, whereas, at the moderately eutrophlcated location, benthic respiration and production were nearly balanced.

show abstract

“…2c; cf. Nausch & Schlungbaum 1991). ) and POM quality as carbohydrate, protein and phytoplankton contributions to POC (µmol C/µmol C; %), C:N ratios and protein: carbohydrate ratios (PAA:PCHO) (µmol C/µmol C) all determined by the pairwise multiple comparison procedure (Student-Newman-Keuls, p < 0.05: < or > denote significant difference between neighbour station or stations marked in bold or bold italics) after Kruskal-Wallis 1-way ANOVA on ranks (Test Statistic H, values represent median) or in the case of normally distributed data after 1-way ANOVA (Test Statistic F, figures are arithmetic means).…”

Section: Methodsmentioning

confidence: 99%

Seston particles along a eutrophication gradient in coastal waters of the Southern Baltic Sea: Significance of detritus and transparent mucoid material

Schumann¹,

Rentsch²,

Görs³

et al. 2001

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Exposed to over 30 yr of continuous eutrophication, the Darß-Zingst bodden chain, a shallow tideless estuary accumulated large amounts of particulate organic matter (POM). We sampled along the eutrophication gradient throughout the vegetation period 1996, in order to assess POM properties. Besides parameters describing the chemical composition, such as C/N ratio, protein content and protein:carbohydrate ratio, particles were microscopically analysed. From the volumes of non-transparent, nucleic acid-containing (fluorescently labelled by propidium iodide) and organic particles (stained with DTAF), the percentages of detrital and transparent mucoid material were derived. Ten to 63% of particulate organic carbon (POC) in the bodden system consisted of carbon from bacteria, phytoplankton and protozoans. Of the total organic particle volume, up to 46% were microorganisms. Although detritus volume averaged 14%, maximum values of 68% could be determined. Most of the organic particle volume consisted to 64% of transparent mucoid matter, which is an important carbon compartment in material cycling (e.g. settling substrate). At higher POC concentrations the chemically unidentified material as well as the mucoid matter were quantitatively more important compared to the mesotrophic Baltic Sea station, where the portion of detritus (62% on average) was much higher. The microscopically derived quantification of detrital and mucoid matter provides additional information on the suitability of seston as settling substrate, its age, origin and physical properties. Since the riverine water input into the bodden system is small and its POC concentration lower compared to the bodden itself, most of the estuarine POM was obviously produced locally. Detritus from submersed macrophytes did not occur before the end of the vegetation period in October and thus cannot contribute significantly to the POM analysed in this study. The high amounts of POM in the bodden system probably originate mainly from pelagic primary production. The sedimentation of POM, its processing in and frequent resuspension from the several mm-thick flocculent sediment layers, seems to be the main source for the high amount of mucoid particles.

show abstract

Eutrophication and Restoration Measures in the Darß‐Zingst Bodden Chain

Cited by 21 publications

References 5 publications

Significance of pelagic and benthic primary production in two shallow coastal lagoons of different degrees of eutrophication in the southern Baltic Sea

Significance of pelagic and benthic primary production in two shallow coastal lagoons of different degrees of eutrophication in the southern Baltic Sea

Primary production of benthic microalgae in two shallow coastal lagoons of different trophic status in the southern Baltic Sea

Seston particles along a eutrophication gradient in coastal waters of the Southern Baltic Sea: Significance of detritus and transparent mucoid material

Contact Info

Product

Resources

About