A multi-proxy paleolimnological reconstruction of trophic state reference conditions for stratified carbonate-rich lakes in northern Germany
Springer eBooks, 2009
Page 1. A multi-proxy paleolimnological reconstruction of trophic state reference conditions for ... more Page 1. A multi-proxy paleolimnological reconstruction of trophic state reference conditions for stratified carbonate-rich lakes in northern Germany Thomas Hübener Æ Sven Adler Æ Petra Werner Æ Manuela Schult Æ Helmut Erlenkeuser Æ Hinrich Meyer Æ Mandy Bahnwart ...
This paleolimnological study aims to investigate how natural processes and anthropogenic land-use... more This paleolimnological study aims to investigate how natural processes and anthropogenic land-use changes have affected sedimentary phosphorus (P) forms and primary producers in a small, temperate lake (Lake Fuglsø, Denmark) throughout the Holocene. Our multi-proxy approach uses pollen, X-ray fluorescence scanning, carbon (C) and nitrogen contents and stable isotopes, sequential P extraction, 31 P nuclear magnetic resonance spectroscopy, pigments, diatoms, and plant macrofossils from a 14 C-dated sediment record. We found three periods of human impact: (1) low disturbance from domestic grazing during the early/mid Neolithic (~3600 to ~2600 BC), (2) higher disturbance because of animal husbandry and some grain cultivation during the Late Bronze and Pre-Roman Iron Age (~800 BC to AD ~100), and (3) strong disturbance caused by domestic grazing, intensified crop cultivation and, in particular, by retting of fiber plants during the Middle Ages and Renaissance (AD ~1000 to ~1700). Cultural eutrophication during the latter phase caused unprecedented changes in the lake, including altered species composition, high production, and strongly accelerated sediment accumulation rates. Generally, catchment deforestation was related to elevated proportions of metal (iron, aluminum, calcium)-bound P forms in the sediment, while high tree cover correlated with elevated proportions of P forms associated with organic material ("organic" P, humic-bound P, refractory organic P) and loosely bound P. During phases with forest in the catchment, silicon (Si) inputs to the lake were insufficient and diatom frustules were mostly absent in the sediments. In contrast, diatoms thrived in the lake when the landscape was open and erosional Si influx was high. This study is the first to show long-term (~eight millennia) and recurring Si limitation of diatoms, a finding that may explain the absence of diatoms in sediment records of other sites too. In summary, human land-use with preceding deforestation accelerated the transport of nutrients and elements from the terrestrial to the aquatic environment, leading to substantial and irreversible changes in Lake Fuglsø. Our study is a good example of the tight links between catchment processes and lake status, indicating that catchment dynamics should be considered in lake restoration projects, particularly for lowland lakes with high catchment : lake area ratios.
[Risk for the Rostock water supply from the Warnov river by an old deposit at Schwann?]
PubMed, Jun 1, 1995
Accidents of the city gasworks in the end of the fifties at Schwaan, a small town south of Rostoc... more Accidents of the city gasworks in the end of the fifties at Schwaan, a small town south of Rostock, resulted in an emission of tar and waste water into the river Warnow, from which the city of Rostock is supplied with drinking water about 20 km downstream. The tar contaminated river sediment (old deposit) covering an area of about 200 m2 has a high pollutant inventory: Steam-distillable phenolic compounds 407 mg/kg in the fresh sediment, polycyclic aromatic hydrocarbons (PAH) 400 to 1100 micrograms/l in the aqueous eluate. The mutagenic potential was detected by the AMES-test. As shown by PAH determinations there were no other pollutant sources in the catchment area, in the tributaries or on other places of the river. The mean PAH concentrations of the river Warnow and his tributaries during 1991 to 1994 were found to be in the range lower than 10 ng/l. Further investigations showed a continuous emission of PAH from the tar laugh in small amounts. An additional emission of pollutants (PAH) and their transportation in the river is expected in the case of sediment disturbances. This emission and their possible consequences are difficult to estimate, even though the seston and the humic substances content of the river seems to reduce the PAH risk. Concluding from our results the probability is very low that pollutants were transported downstream to Rostock and pass the water works but may not totally be excluded. Nevertheless from the viewpoint of care a removal of the old deposit is necessary.
Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen, 2002
The routine monitoring of lakes only started after initial disturbanees were registered. Therefor... more The routine monitoring of lakes only started after initial disturbanees were registered. Therefore, predisturbanee or baekground nutriem levels are unknown (ANDERSON & R!PPEY 1994). Geoehemieal analyses and diatom investigations of sediment cores are suitable for tracing the historical development of lake water quality and the effects of anthropogenic impaet (DIXIT et al. 1992, RoWELL 1996). For both eeological and lake management strategies, however, it is necessary to have information on the natural state of the lake prior to the disturbanee, before lake restoration can begin (ScHINDLER 1987, ANDERSON et al. 1993)
Dynamik des Phytoplanktons der Oberwarnow 1984–1986
Acta hydrochimica et hydrobiologica, 1989
The development of the phytoplankton was observed from 1984 to 1986 in the Warnow‐River (GDR, Mec... more The development of the phytoplankton was observed from 1984 to 1986 in the Warnow‐River (GDR, Mecklenburg). The dominant algae throughout the year were the Bacillariophyceae with their maximum in spring (1984: 36.1 mm3/1, 1986: 32.3 mm3/1) or in autumn (1985: 48.3 mm3/1). There is not any limitation of phytoplankton by inorganic nutritation (N, P) throughout the year. The phytoplankton production was most influenced by the turbulance of water. Classification of banked‐up rivers with the help of the plankton‐quotients of Thunmark and Nygaard is impossible.
Stephanodiscus makarovae, a taxon originally described from Russia, is morphologically similar to... more Stephanodiscus makarovae, a taxon originally described from Russia, is morphologically similar to several other taxa within Cyclostephanos, namely C. invisitatus, C. delicatus and C. tholiformis. However, it has not yet been transferred into Cyclostephanos, perhaps due to the difficulty in identifying it, as its original description is available only in the Russian language. To investigate its morphology, a detailed morphological comparison of S. makarovae and C. invisitatus was done from 286 SEM micrographs of 12 monoclonal strains. We performed a three-gene phylogenetic analysis with strains from eight additional taxa to independently confirm the position of S. makarovae. The morphology of S. makarovae shows key features of the genus Cyclostephanos and this attribution is supported by the phylogeny. Here we propose the transfer of the taxon S. makarovae to Cyclostephanos, considering the morphological and molecular data. According to both the molecular and morphological data, C. d...
Mit 113,5 km2 Wasserfläche und einem Einzugsgebiet von 1230 km2 ist die Müritz (62 m HN) der zwei... more Mit 113,5 km2 Wasserfläche und einem Einzugsgebiet von 1230 km2 ist die Müritz (62 m HN) der zweitgrösste See des nordmitteleuropäischen Tieflandes (Knapp et al. 1999). Sie war in den vergangenen Jahrzehnten bereits mehrfach das Ziel paläohydrologischer und landschaftsgenetischer Untersuchungen, die sich bislang jedoch auf das terrestrische und telmatische Umfeld beschränkten. Durch Kaiser (1998) und Kaiser et al. (2002) wurde der bisherige Wissensstand detailliert zusammengefasst. Die hier vorgestellten Seebohrungen hatten das Ziel, die Landschafts- und Gewässerentwicklung anhand von Seesedimenten gut aufgelöst zu rekonstruieren und offene Fragen zu Wasserstandsschwankungen zu klären. Die Untersuchung der Seesedimente bot zudem die Chance einer über ein grosses Einzugsgebiet integrierenden Rekonstruktion der Vegetationsgeschichte sowie der erstmaligen Bearbeitung der Sedimentations- und Trophieentwicklung der Müritz seit dem Spätglazial.researc
Algae-especially highly diverse groups with huge shares of stenoecious species-are versatile indi... more Algae-especially highly diverse groups with huge shares of stenoecious species-are versatile indicators for different parameters of water quality. Containing determinable, persisting structures further qualifies some algae groups to be used in paleolimnological analyses. The most commonly used algae group in paleolimnology are diatoms-a multitude of diatom training sets exists for various variables of water quality, notably pH, total phosphorous and salinity. This mini-review discusses advances in and demands on such training sets. Furthermore, a brief outline of past paleolimnological research is giving. Recent research trends are discussed, e.g. analyzing complex interactions of several variables-especially a possible climatic effect on pH or trophy-and the application of new molecular methods (NGS, metabarcoding) for bioindication.
Mit 113,5 km² Wasserfläche und einem Einzugsgebiet von 1230 km² ist die Müritz (62 m HN) der zwei... more Mit 113,5 km² Wasserfläche und einem Einzugsgebiet von 1230 km² ist die Müritz (62 m HN) der zweitgrößte See des nordmitteleuropäischen tieflandes (Knapp et al. 1999). Sie war in den vergangenen Jahrzehnten bereits mehrfach das Ziel paläohydrologischer und landschaftsgenetischer Untersuchungen, die sich bislang jedoch auf das terrestrische und telmatische Umfeld beschränkten. Durch Kaiser (1998) und Kaiser et al. (2002) wurde der bisherige Wissensstand detailliert zusammengefasst. Die hier vorgestellten Seebohrungen hatten das Ziel, die Landschafts-und Gewässerentwicklung anhand von Seesedimenten gut aufgelöst zu rekonstruieren und offene Fragen zu Wasserstandsschwankungen zu klären. Die Untersuchung der Seesedimente bot zudem die Chance einer über ein großes Einzugsgebiet integrierenden Rekonstruktion der Vegetationsgeschichte sowie der erstmaligen Bearbeitung der Sedimentations-und trophieentwicklung der Müritz seit dem Spätglazial. Die Arbeiten wurden in den Sommermonaten der Jahre 2004 und 2005 mit der Entnahme der Kerne MÜR-1 und MÜR-3 in Flachwasserbereichen im Süd-bzw. Nordteil, MÜR-2 im Profundal und MÜR-9 im Verlandungsbereich der Sietower Bucht (Abb. 1) durchgeführt. Zu Übersichtszwecken wurde eine größere Zahl von Sondierungen im nördlichen und westlichen landwärtigen Uferbereich um die Sietower Bucht niedergebracht. Ergänzende Untersuchungen wurden auf der Halbinsel Großer Schwerin mit dem Ziel durchgeführt, jüngere Wasserspiegelschwankungen zu identifizieren und zu datieren. Die Bearbeiter bedanken sich bei der Leitung und den Mitarbeitern des Nationalparks Müritz für die vertrauensvolle Zusammenarbeit und stete Förderung. Die Arbeiten wurden ermöglicht durch finanzielle Zuwendungen des Seenprojekts am Umweltministerium Mecklenburg-Vorpommern, durch die Jost-Reinhold-Stiftung und eine Beteiligung des Müritz-Nationalparks. Auch ihnen gilt unser Dank.
... Gordon & Pacheco (2007) and Peroutka et al. ... The microalgae spectra of U. foliosa and ... more ... Gordon & Pacheco (2007) and Peroutka et al. ... The microalgae spectra of U. foliosa and U. gibba from Ivory Coast differed con-siderably and only 6 taxa (out of 45 and 31 taxa recorded in traps of U. foliosa and U. gibba, respectively) were in common (5 Charophyceae, 1 ...
Flora - Morphology, Distribution, Functional Ecology of Plants, 2009
The carnivorous bladderworts (Utricularia) possess complicated suction traps. Remarkably, informa... more The carnivorous bladderworts (Utricularia) possess complicated suction traps. Remarkably, information on the prey trapped is relatively sparse. We have conducted a detailed survey on the prey spectra found in traps of selected aquatic bladderworts (U. australis, U. vulgaris) occurring in ponds in northeastern Germany. A close examination of more than 200 traps revealed cladocerans, copepods, rotiferas, ciliates and insect larvae as being common prey. Of particular interest was the considerable amount of phytoplankton (i.e. algae, cyanobacteria) found in the traps. In total, more than 160 algae species (among others, Kirchneriella lunaris, Scenedesmus quadricauda and S. acuminatus) belonging to more than 50 genera were present, with Chlorophyceae being dominant. The role of the vegetarian diet for nutrient supply of bladderworts is discussed.
Research Article Dissolved and particulate phosphorus forms in a eutrophic shallow lake
Abstract. Soluble and particulate phosphorus forms in the surface water of the eutrophic shallow ... more Abstract. Soluble and particulate phosphorus forms in the surface water of the eutrophic shallow Lake Bützow were investigated from March to November 1998. Solu-ble reactive phosphorus (SRP) and dissolved organic phosphorus (DOP) of the filtered water were analysed. Suspended particulate matter (SPM) was characterized by particulate organic matter (POM), particulate organic carbon (POC), particulate phosphorus (PP), particulate iron (PFe), phytoplankton biomass (PB) and Chl a. PP was investigated in more detail by means of sequential chemical extraction (Psenner et al., 1984) and the analysis of polyphosphates and phospholipids. In spring, the lowest SRP values and highest PP values were recorded. Over the course of the year, SRP
Changes in composition of diatom (Bacillariophyceae) communities and pollen content were analyzed... more Changes in composition of diatom (Bacillariophyceae) communities and pollen content were analyzed in two cores from the lake Krakower See, Mecklenburg-Vorpommern, Northern Germany. Based on the pollen stratigraphy, a time-depth-curve was built that allowed an estimate of the rate of sedimentation. The pollen curves, especially those of settlement indicators, showed the human influence in the surrounding area. Diatom assemblages clearly indicated that human activities had influenced not only the terrestrial vegetation but also the water body of the lake and it’s trophic conditions. From a natural oligo- to mesotrophic lake that had small oscillations in prehistoric times it switched rela-tively fast into an eutrophic one around 700 years ago. This radical change in the trophic status was an effect of both damming up for mills in the 13th century and increasing settlement activities around the lake. Key words: paleolimnology, diatom and pollen stratigraphy, TP reconstruction
Sie befinden sich sowohl an den West-als auch an den Ostseiten der Negativformen. Kleinere Formen... more Sie befinden sich sowohl an den West-als auch an den Ostseiten der Negativformen. Kleinere Formen werden durch weit verbreitete Kuppendünen repräsentiert. Im Zentrum der Untersuchungen stand der Krumme See bei Blankenförde bzw. dessen näheres Umland. Der See ist Teil der Seen im oberen Havelgebiet. Die Havel ist mit ihren Fließseen im Untersuchungsgebiet stark anthropogen beeinflusst und ist flussaufwärts ab dem Jäthensee ein "künstliches Gebilde" (Hube 1932; Kaiser & Zimmermann 1994, S. 151). Der Krumme See ist ein oligo-mesotropher, subalkalischer Klarwassersee. Der See ist geschichtet und weist zweimal pro Jahr eine Vollzirkulation auf (Dimixis). Aufgrund seines geringen mittleren Abflusses ist er quasi abflusslos (Tab. 1). Der Wasserzulauf wird dabei von Grundwasser dominiert. Untergeordnet tragen Niederschläge und der Oberflächen-bzw. Zwischenabfluss zur Wasserspeisung bei, wodurch sich der Krumme See als Grundwassersee einordnen lässt (vgl. Mauersberger 2002). Aufgrund seiner Morphometrie ist er ein mittelgroßer Rinnen-Tiefsee, welcher sich durch einen schmalen Verlandungssaum bzw. vereinzelte Bereiche mit einer sandigen Schorre vor allem am Ostufer des Sees auszeichnet (Abb. 3; Tab. 1; vgl. Succow & Kopp 1985).
Disentangling influences on varve preservation in a 1200-year record of partially varved sediments from Lake Tiefer See (NE Germany)–A multi-proxy approach
Uploads
Papers by Thomas Hübener