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Erarbeitung einer Konzeption eines Umweltinformationssystems fuer die Insel Ruegen

Modellhafte Beseitigung von Umweltschaeden und Korrosionsschutz an dem technischen Denkmal Windschoepfwerk Lobbe auf Ruegen (Mecklenburg-Vorpommern)

Geogefahrenhinweiskarte Jasmund

Geogefahrenhinweiskarte im Maßstab 1:10.000 für den Bereich Jasmund (Rügen)

Halichoerus grypus grypus (Fabricius, 1791) Halichoerus grypus balticus Nehring, 1886 Baltische Kegelrobbe Säugetiere Stark gefährdet

Durch den Wiederfund des Typusexemplares (Schädel einer Kegelrobbe von der Insel Amager, Dänemark) wurde eindeutig belegt, dass dieses zur Unterart der Baltischen Kegelrobbe zählt (Olsen et al. 2016). Hierdurch wurde die Unterart ehemals H. g. balticus zu H. g. grypus und ehemals H. g. grypus zu H. g. atlanticus. Nach intensiver Jagd und Ausrottung in Deutschland um 1920 (Herrmann et al. 2007) haben sich die Bestände ostseeweit erholt. Seit 2005 ist eine durchgehende Anwesenheit der Tiere im Greifswalder Bodden, besonders am Großen Stubber, belegt. Seit 2010 steigen auch die Zahlen auf der Greifswalder Oie stetig an. Im März/April 2019 wurden kurzfristig bis zu 300 Kegelrobben im Greifswalder Bodden gezählt. Im Verlauf des Jahres geht die Zahl auf unter 30 zeitgleich festgestellte Tiere zurück. Eine erste Kegelrobbengeburt konnte im Frühjahr 2018 an der Küste Rügens nachgewiesen werden. Die Gefährdungskategorie „Stark Gefährdet“ spiegelt die geringe Anzahl an nachgewiesenen Geburten, die geringen Bestände und die Bedrohung durch Beifang in Reusen und Stellnetzen wider (Vanhatalo et al. 2014). Auch die in der Vergangenheit dokumentierte Beeinträchtigung der Reproduktionsorgane durch den „Baltic Seal Disease Complex“ wirkt noch nach (Roos et al. 2012).

Water isotope time series (March 2020 - March 2021) of samples collected at A. P. Møller Skolen, Kleine Breite, Schlei

Time series of stable isotopes (δ2H and δ18O) were analyzed in water samples collected near the A. P. Møller Skolen, Schleswig (Kleine Breite, Schlei), in biweekly to monthly intervals between March 2020 and March 2021. Water was sampled with a pipette from ca. 0.5 m below water surface and directly transferred into a measurement vial. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. Water chemical parameters were measured in-situ with a modular WTW 3440 multiparameter devices and regularly calibrated conductivity cells (MPP 930 IDS, TetraCon® 925-P). The data give information about the seasonal isotope amplitude at the sampled locations and about spatial variability along the transects.

Water isotope values in samples collected June 2019, March 2020 and July 2020 along estuarine systems at the Baltic Sea coast

Stable isotopes (δ2H and δ18O) were analyzed in water samples collected at 68 spots along the Schlei, the Zingster Bodden chain, and the Rügener and Greifswalder Boddens in June 2019, March 2020, and July 2021. Transect samples were taken at shores from 0.3 to 0.6 m below water surface, using a pipette, and directly transferred into measurement vials. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. Water chemical parameters were measured in-situ with a WTW multiparameter device (Multi 3630 IDS), equipped with a WTW TetraCon 925 electrical conductivity measuring cell. The data give information about the spatial isotope variability along the transects.

Water isotope time series (March 2020 - March 2021) of samples collected in Kloster, Hiddensee

Time series of stable isotopes (δ2H and δ18O) were analyzed in water samples taken near the harbour of Kloster (Hiddensee), in biweekly to monthly intervals between March 2020 and March 2021. Water was sampled with a pipette from ca. 0.5 m below water surface and directly transferred into a measurement vial. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. Water chemical parameters were measured in-situ with WTW multiparameter measurement devices. The data give information about the seasonal isotope amplitude at the sampled locations and about spatial variability along the transects.

Water isotope time series (March 2020 - March 2021) of samples collected along the Zingster Bodden chain

Time series of stable isotopes (δ2H and δ18O) were analyzed in water samples collected at the Zingster Bodden chain in biweekly to monthly intervals between March 2020 and March 2021. Herefore, a Limnos sampler was used to obtain water from 0.5 to 1 m below surface. In the laboratory, a WTW 1970i conductivity meter and TetraCon 325 measuring cell were used to analyse electrical conductivity. Sub-samples were transferred into measurement vials before isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. Water chemical parameters were measured with regularly calibrated WTW multiparameter devices. The data give information about the seasonal isotope amplitude at the sampled locations and about spatial variability along the transects.

Water isotope values from estuarine systems along the German Baltic Sea coast

Stable isotopes (δ²H and δ¹⁸O) were analyzed in water samples collected at the German Baltic Sea Coast. Transect samples were taken in June 2019, March 2020, and July 2021 at 68 spots along the Schlei, the Zingster Bodden chain, and the Rügener and Greifswalder Boddens. Additionally, at selected spots time series were sampled in biweekly to monthly intervals between March 2020 and March 2021. At shores, water was sampled with a pipette from 0.3 to 0.6 m below water surface and directly transferred into a measurement vial. In deeper parts of the boddens a Limnos sampler was used to obtain water from 0.5 to 1 m below surface. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. The measurement uncertainty was quantified by error propagation, including the parameters a) uncertainties of lab standards; b) errors of standard calibration; c) average standard deviation of replicate measurements. Based on this, measurement uncertainty was estimated to account 0.16 ‰ for δ¹⁸O and 0.57 ‰ for δ²H. Water chemical parameters were measured with WTW measurement devices. The data give information about a) the seasonal isotope amplitude at the sampled locations; b) spatial variability along the transects, and c) the correlation between isotopes and water chemical parameters.

Mysteriöses Fischsterben am Jasmunder Bodden

In den letzten Jahren gab es bereits zwei große Fischsterben im kleinen Jasmunder Bodden. Zunächst im Dezember 2021, und erneut im Januar 2023. Wochenlang beschäftigen sich Behörden, Labore und Umweltschutzorganisationen mit dem Fischsterben auf der Ostseeinsel Rügen: Mehr als 30 Tonnen toter Fische wurden im Winter 2021/22 geborgen, darunter Brassen, Zander, sogar Hechte.

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