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
19908
2000
2000
eng
article
1
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Occurrence of an algal mass development in an acidic (pH 2.5), iron and aluminium-rich coal mining pond
allegro:1991-2014
10093275
Acta hydrochimica et hydrobiologica. - 28 (2000), S. 305 - 309
S. Wölfl
Jörg Tittel
Barbara Zippel
R. Kringel
Institut für Biochemie und Biologie
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
19421
2000
2000
deu
article
1
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Ressourcennutzung und -weitergabe im planktischen Nahrungsnetz eines extrem sauren (pH 2,7) Tagebausees
allegro:1991-2014
10090646
Brandenburgische UmweltBerichte. - 8 (2000), S. 118 - 120
Jörg Tittel
Guntram Weithoff
Vera Bissinger
Ursula Gaedke
Institut für Biochemie und Biologie
19408
2000
2000
eng
article
1
--
--
--
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
18384
2001
2001
deu
article
1
--
--
--
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
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
16837
2002
2002
eng
article
1
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--
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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
15804
2003
2003
eng
article
1
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Mixotrophs combine resource use to outcompete specialists: Implications for aquatic food webs
The majority of species can be grouped into those relying solely on photosynthesis (phototrophy) or those relying solely on the assimilation of organic substances (heterotrophy) to meet their requirements for energy and carbon. However, a special life history trait exists in which organisms combine both phototrophy and heterotrophy. Such 'mixotrophy' is a widespread phenomenon in aquatic habitats and is observed in many protozoan and metazoan organisms. The strategy requires investment in both photosynthetic and heterotrophic cellular apparatus, but the benefits must outweigh these costs. In accordance with the mechanistic resource competition theory, laboratory experiments revealed that pigmented mixotrophs combined light and prey as substitutable resources. Thereby, they reduced prey abundance below the critical food concentration of competing specialist grazers [Rothhaupt, K. O. (1996) Ecology 77, 716-724]. Here, we demonstrate for the first time the important consequences of this strategy for an aquatic community. In the illuminated surface strata of a lake, mixotrophs reduced prey abundance so steeply that grazers from higher trophic levels, consuming both the mixotrophs and their prey, could not persist. Thus, the mixotrophs escaped from both competition and grazing, and remained dominant. Furthermore, the mixotrophs structured the prey abundance along the vertical light gradient creating low densities near the surface and a pronounced maximum of their algal prey at depth. Such deep algal accumulations are typical features of nutrient poor aquatic habitats, previously explained by resource availability. We hypothesize instead that the mixotrophic grazing strategy is responsible for deep algal accumulations in many aquatic environments.
www.pnas.org/cgi/doi/10.1073/pnas.2130696100
allegro:1991-2014
10096043
Proceedings of the National Academy of Sciences of the United States of America. - 100 (2003), 22, S. 12776 - 12781
Jörg Tittel
Vera Bissinger
Barbara Zippel
Ursula Gaedke
Elanor M. Bell
Andreas Lorke
Norbert Kamjunke
Institut für Biochemie und Biologie