19809
2000
2000
eng
article
1
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A new medium free of organic carbon to cultivate organisms from extremely acidic mining lakes (pH 2.7)
An algal culture medium was developed which reflects the extreme chemical conditions of acidic mining lakes (pH 2.7, high concentrations of iron and sulfate) and remains stable without addition of organic carbon sources. It enables controlled experiments e.g. on the heterotrophic potential of pigmented flagellates in the laboratory. Various plankton organisms isolated from acidic lakes were successfully cultivated in this medium. The growth rates of an Chlamydomonas- isolate from acidic mining lakes were assessed by measuring cell densities under pure autotrophic and heterotrophic conditions (with glucose as organic C-source) and showed values of 0.74 and 0.40, respectively.
allegro:1991-2014
10092442
Acta hydrochimica et hydrobiologica. - 28 (2000), S. 310 - 312
Vera Bissinger
Jörn Jander
Jörg Tittel
Institut für Biochemie und Biologie
19408
2000
2000
eng
article
1
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Process rates and growth limiting factors of planktonic algae (Chlamydomonas sp.) from extremely acidic (pH 2,5 3) mining lakes in Germany
allegro:1991-2014
10090627
Brandenburgische UmweltBerichte. - 8 (2000), S. 80 - 82
Vera Bissinger
Jörg Tittel
Institut für Biochemie und Biologie
14800
2004
2004
eng
article
1
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Strong vertical differences in the plankton composition of an extremely acidic lake
Vertical differences in food web structure were examined in an extremely acidic, iron-rich mining lake in Germany (Lake 111; pH 2.6, total Fe 150mg L-1) during the period of stratification. We tested whether or not the seasonal variation of the plankton composition is less pronounced than the differences observed over depth. The lake was strongly stratified in summer, and concentrations of dissolved organic carbon and inorganic carbon were consistently low in the epilimnion but high in the hypolimnion. Oxygen concentrations declined in the hypolimnion but were always above 2mg L-1. Light attenuation did not change over depth and time and was governed by dissolved ferric iron. The plankton consisted mainly of single-celled and filamentous bacteria, the two mixotrophic flagellates Chlamydomonas sp. and Ochromonas sp., the two rotifer species Elosa worallii and Cephalodella hoodi, and Heliozoa as top predators. We observed very few ciliates and rhizopods, and no heterotrophic flagellates, crustaceans or fish. Ochromonas sp., bacterial filaments, Elosa and Heliozoa dominated in the epilimnion whereas Chlamydomonas sp., single-celled bacteria and Cephalodella dominated in the hypolimnion. Single-celled bacteria were controlled by Ochromonas sp. whereas the lack of large consumers favoured a high proportion of bacterial filaments. The primarily phototrophic Chlamydomas sp. was limited by light and CO2 and may have been reduced due to grazing by Ochromonas sp. in the epilimnion. The distribution of the primarily phagotrophic Ochromonas sp. and of the animals seemed to be controlled by prey availability. Differences in the plankton composition were much higher between the epilimnion and hypolimnion than within a particular stratum over time. The food web in Lake 111 was extremely species-poor enabling no functional redundancy. This was attributed to the direct exclusion of species by the harsh environmental conditions and presumably enforced by competitive exclusion. The latter was promoted by the low diversity at the first trophic level which, in turn, was attributed to relatively stable growth conditions and the independence of resource availability (inorganic carbon and light) from algal density. Ecological theory suggests that low functional redundancy promotes low stability in ecosystem processes which was not supported by our data.
allegro:1991-2014
10098157
Archiv für Hydrobiologie. - 3 (2004), 161, S. 289 - 306
Norbert Kamjunke
Ursula Gaedke
Jörg Tittel
Guntram Weithoff
Elanor M. Bell
Institut für Biochemie und Biologie
Nicht ermittelbar
13693
2005
2005
eng
article
1
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High heterotrophic bacterial production in acidic, iron-rich mining lakes
The acidic mining lakes of Eastern Germany are characterized by their extremely low pH and high iron concentrations. Low concentrations of CO2 in the epilimnion due to the low pH and reduced light transmission due to dissolved ferric iron potentially limit phytoplankton primary production (PP), whereas dissolved organic carbon (DOC) may promote heterotrophic production of bacteria (HP). We, therefore, tested whether HP exceeds PP in three lakes differing in pH and iron concentration (mean pH 2.3-3.0, 23-500 mg Fe L-1). Bacterial biomass and HP achieved highest values in the most acidic, most iron-rich lake, whereas PP was highest in the least acidic lake. HP was often higher than PP (ratio HP/PP up to 11), indicating that planktonic PP was not the main carbon source for the bacteria. HP was not related to PP and DOC, but HP as well as bacterial biomass increased with decreasing pH. Light stimulated the formation of ferrous iron, changed the DOC composition, and increased the HP in laboratory experiments, suggesting that iron photoreduction caused DOC degradation. This may explain why we found the highest HP in the most acidic and most rich lake. Overall, the importance of bacteria in the cycling of matter and as a basis for the whole food web seemed to increase in more acidic lakes with higher iron concentrations
0095-3628
allegro:1991-2014
10103845
Microbial Ecology. - ISSN 0095-3628. - 49 (2005), 3, S. 425 - 433
Norbert Kamjunke
Jörg Tittel
H. Krumbeck
Camilla Beulker
J. Poerschmann
Institut für Biochemie und Biologie
Referiert
18384
2001
2001
deu
article
1
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Bergbaufolgegewässer
allegro:1991-2014
10093276
Handbuch angewandte Limnologie : Grundlagen, Gewässerbelastung, Restaurierung, aquatische Ökologie, Bewertung, Gewässerschutz / Hrsg.: Christian Steinberg ... - Landsberg am Lech : ecomed, 1995 ff. - Losebl.-Ausg. - V-1.3 (11/2001)
H. Klapper
Bertram Boehrer
G. Packroff
M. Schultze
Jörg Tittel
Katrin Wendt-Potthoff
Institut für Biochemie und Biologie
16837
2002
2002
eng
article
1
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Function of straw for in situ remediation of acidic mining lakes
0049-6979
allegro:1991-2014
10093278
Water, Air, and Soil Pollution / Focus. - ISSN 0049-6979. - 2 (2002), 3, S. 97 - 109
Matthias Koschorreck
René Frömmichen
Peter Herzsprung
Jörg Tittel
Katrin Wendt-Potthoff
Institut für Biochemie und Biologie
16817
2002
2002
eng
article
1
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Benthic photosynthesis in an acidic mining lake (pH 2.6).
allegro:1991-2014
10093279
Limnology and Oceanography. - 47 (2002), S. 1197 - 1201
Matthias Koschorreck
Jörg Tittel
Institut für Biochemie und Biologie
46709
2017
2017
eng
1891
1901
11
23
article
Wiley
Hoboken
1
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Unexpected release of phosphate and organic carbon to streams linked to declining nitrogen depositions
Reductions in emissions have successfully led to a regional decline in atmospheric nitrogen depositions over the past 20 years. By analyzing long-term data from 110 mountainous streams draining into German drinking water reservoirs, nitrate concentrations indeed declined in the majority of catchments. Furthermore, our meta-analysis indicates that the declining nitrate levels are linked to the release of dissolved iron to streams likely due to a reductive dissolution of iron(III) minerals in riparian wetland soils. This dissolution process mobilized adsorbed compounds, such as phosphate, dissolved organic carbon and arsenic, resulting in concentration increases in the streams and higher inputs to receiving drinking water reservoirs. Reductive mobilization was most significant in catchments with stream nitrate concentrations < 6 mg L-1. Here, nitrate, as a competing electron acceptor, was too low in concentration to inhibit microbial iron(III) reduction. Consequently, observed trends were strongest in forested catchments, where nitrate concentrations were unaffected by agricultural and urban sources and which were therefore sensitive to reductions of atmospheric nitrogen depositions. We conclude that there is strong evidence that the decline in nitrogen deposition toward pre-industrial conditions lowers the redox buffer in riparian soils, destabilizing formerly fixed problematic compounds, and results in serious implications for water quality.
Global change biology
10.1111/gcb.13498
27614066
1354-1013
1365-2486
wos:2017
WOS:000397800600012
Musolff, A (reprint author), UFZ Helmholtz Ctr Environm Res, Dept Hydrogeol, Permoserstr 15, D-04318 Leipzig, Germany., andreas.musolff@ufz.de
Federal Ministry of Education and Research Germany (BMBF) [02WT1290A]
importub
2020-04-20T03:44:03+00:00
filename=package.tar
97d3bedc959492354187a450c25a1f61
Andreas Musolff
Benny Selle
Olaf Buttner
Michael Opitz
Jörg Tittel
eng
uncontrolled
atmospheric deposition
eng
uncontrolled
carbon cycle
eng
uncontrolled
nitrogen biogeochemistry
eng
uncontrolled
organic matter
eng
uncontrolled
riparian zone
eng
uncontrolled
streamwater chemistry
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
Import
18220
2001
2001
deu
article
1
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Von der Altlast zum See : natürliche Selbstreinigung
allegro:1991-2014
10093277
Biologie in unserer Zeit. - 32 (2002), 5, S. 276 - 285
Ulrich Stottmeister
Erika Weißbrodt
Jörg Tittel
Institut für Biochemie und Biologie
13905
2005
2005
eng
article
1
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Inorganic carbon limitation and mixotrophic growth in Chlamydomonas from an acidic mining lake
Plankton communities in acidic mining lakes (pH 2.5-3.3) are species-poor because they face extreme environmental conditions, e.g. 150 mg l(-1) Fe2++Fe3+. We investigated the growth characteristics of the dominant pigmented species, the flagellate Chlamydomonas acidophila, in semi-continuous culture experiments under in situ conditions. The following hypotheses were tested: (1) Low inorganic carbon (IC) concentrations in the epilimnion (e.g. 0.3 mg l(-1)) arising from the low pH limit phototrophic growth (H-1); (2) the additional use of dissolved organic carbon (mixotrophy) leads to higher growth rates under IC-limitation (H-2), and (3) phagotrophy is not relevant (H-3). H- 1 was supported as the culture experiments, in situ PAR and IC concentrations indicated that IC potentially limited phototrophic growth in the mixed surface layers. H-2 was also supported: mixotrophic growth always exceeded pure phototrophic growth even when photosynthesis was saturated. Dark growth in filtered lake water illuminated prior to inoculation provided evidence that Chlamydomonas was able to use the natural DOC. The alga did not grow on bacteria, thus confirming H-3. Chlamydomonas exhibited a remarkable resistance to starvation in the dark. The compensation light intensity (ca. 20 mu mol photons m(-2) s(-1)) and the maximum phototrophic growth (1.50 d(-1)) fell within the range of algae from non-acidic waters. Overall, Chlamydomonas, a typical r-strategist in circum-neutral systems, showed characteristics of a K-strategist in the stable, acidic lake environment in achieving moderate growth rates and minimizing metabolic losses. (c) 2005 Elsevier GmbH. All rights reserved
1434-4610
allegro:1991-2014
10104355
Protist. - ISSN 1434-4610. - 156 (2005), 1, S. 63 - 75
Jörg Tittel
Vera Bissinger
Ursula Gaedke
Norbert Kamjunke
Institut für Biochemie und Biologie
Referiert