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Heatwaves experiment in the Kiel Outdoor Benthocosm 2015: consumers' respiration

The data were generated during an experiment simulating different frequencies of heatwaves (zero, one and three) in late spring/summer. The experiment was carried out at the Kiel Outdoor Benthocosm (KOB) of GEOMAR Helmholtz Centre for Ocean Research Kiel, located at the Kiel Fjord. The consumers were collected from the mesocosm tanks and the respiration rates were measured in the lab. The measurements were carried out on 10.08.2015 (Idotea balthica), 11.08.2015 (Littorina littorea) and 14.08.2015 (Gammarus sp.). The organisms were kept in gas-tight bottles equipped with sensor spots for non-invasive oxygen measurements, which allowed continuous oxygen logging. Throughout the measurements, the bottles were kept in water baths with temperature set to 19.7 °C, which was the temperature all the KOB tanks were exposed to at the time of the measurements. The oxygen values were converted to carbon and normalized by the area of the tank (1.53 m2) per day.

Heatwaves experiment in the Kiel Outdoor Benthocosm 2015: macrophytes

The data were generated during an experiment simulating different frequencies of heatwaves (zero, one and three) in late spring/summer 2015. The experiment was carried out at the Kiel Outdoor Benthocosm (KOB) of GEOMAR Helmholtz Centre for Ocean Research Kiel, located at the Kiel Fjord. The biomass of filamentous algae was quantified from the most abundant genus occurring inside the tanks, i.e. Ceramium sp. The biomass of Zostera marina and Fucus vesiculosus was estimated from growth rates measurements carried out every 15 days. The biomass of all macrophytes was converted to carbon using specific carbon contents measured concomitantly with stable isotopes (https://doi.pangaea.de/10.1594/PANGAEA.966179). Respiration and primary production measurements were carried out on 09.08.2015 for filamentous algae, and on 12.08.2015 for Fucus vesiculosus. To execute these measurements, organisms were kept in gas-tight cylindrical chambers equipped with sensor spots for non-invasive oxygen measurements, which allowed continuous oxygen logging. Throughout the measurements, the chambers were kept inside the KOB tanks to maintain the temperature. The oxygen values were converted to carbon and normalized by the area of the tank (1.53 m2) per day. Note that the data of net primary production and respiration rates of the Z. marina were previously published (https://doi.org/10.1594/PANGAEA.904632). The carbon flux refers to the exports, i.e. biomass that was floating in the tanks, which was considered as carbon leaving (i.e. exported outside of) the system but still usable. The material to quantify the exports was collected every seven days, separated accounting for the contribution of each macrophyte group, dried at 80 °C until the biomass was constant and weighted. The dry weight was converted to carbon using the specific carbon contents measured concomitantly with stable isotopes (https://doi.pangaea.de/10.1594/PANGAEA.966179), and normalized by the area of the tank (1.53 m2) per day.

Heatwaves experiment in the Kiel Outdoor Benthocosm 2015: stable isotopes

The data refer to an experiment simulating different frequencies of heatwaves (zero, one and three) in late spring/summer 2015. The experiment was carried out at the Kiel Outdoor Benthocosm (KOB) of GEOMAR Helmholtz Centre for Ocean Research Kiel, located at the Kiel Fjord. The organisms were collected from the mesocosm tanks, stored at -80 °C, dried at 60 °C for at least 48 hours, and ground with agate mortar and pestle. The ground material was subsampled, weighed and placed into tin capsules (3.2 × 4.0 mm, Hekatech, Wegberg, Germany). These samples were analysed with an elemental analyser system (NA 1110, Thermo, Milan, Italy) connected to a temperature-controlled gas chromatography oven (SRI 9300, SRI Instruments, Torrance, CA, USA) and to an isotope-ratio mass spectrometer (DeltaPlus Advantage, Thermo Fisher Scientific) as described in Hansen et al. (2009), https://doi.org/10.1002/rcm.4267.

Senckenberg Dogger Bank Monitoring Data_Amphipoda_2024

<p>This dataset presents newly collected records of amphipod specimens gathered during the 2024 scientific benthic survey (Cruise DOG24) at the Dogger Bank, North Sea, part of an ongoing annual monitoring effort that has taken place from 1991 to 2024. A total of 8,444 specimens of 14 species belonging to 13 families, 14 genera, and 10 species were identified using morphological methods with Leica M60 and DM750 microscopes. Amphipods, key components of marine benthic ecosystems, were sampled by beam trawl over the Dogger Bank’s stable sandy substrate. This dataset supports a broader research project aimed at (i) developing a taxonomic key for Dogger Bank amphipods, (ii) identifying environmental drivers of species distribution and diversity, and (iii) predicting responses to climate change. Data were structured following the Darwin Core standard.</p><p>The Dogger Bank epibenthos is sampled with a 2 m beam trawl at 37 stations on a yearly basis since 1991 by Senckenberg Marine Zoology. At each station, the catch is sieved to preserve the fine fraction (1 cm - 1 mm), while megafaunal animals are sorted, identified and recorded by their abundance on board of RV Senckenberg. The crustacean and Ichthyology collections at Senckenberg Marine Zoology house the fine fractions from these cruises. In this project, we aim to identify the amphipod species composition and relative abundance from these fine fractions. Starting with the analysis of the fine fractions from the year 2024, we will step by step enhance the dataset with identifications of amphipod fine fractions from other years, back until 1991.</p>

Bestandsaufnahme der Grundwasserfauna Baden-Wuerttembergs unter besonderer Beruecksichtigung des Vergleichs zweier Grundwasserlandschaften

Bestandsaufnahme der Grundwasserfauna durch qualitative Probennahme (Ufergrabungen, Brunnenproben) entlang Rhein, Donau, Neckar und Zufluessen, Tauber; Aufbau einer kleinen Datenbank mit allen die Grundwassertiere Baden-Wuerttembergs betreffenden Informationen: - Vergleich der Besiedelung zweier chemisch gut unterscheidbarer Grundwasserlandschaften (Kiese und Sande des Oberrheingrabens, Kristallin des Schwarzwaldes). - Vergleich der Besiedelung der Kiese und Sande des Oberrheingrabens in einem anthropogen unbeeinflussten und einem durch einen Schadensfall oder eine Altlast mit definierten Schadstoffen belasteten Bereich. - Laborbeobachtungen an charakteristischen Grundwassertieren Baden-Wuerttembergs. Das Artenspektrum der bislang bestimmten Fauna aus dem quartaeren und kristallinen Grundwasser konnte von 64 Arten 1993 auf 104 Arten erhoeht werden. Neben den Copepoda (Cyclopoida, Harpacticoida) wurden Amphipoda (Niphargidae), Asellota und Ostracorda bearbeitet. Mit der Auswertung der grundwasserlandschaftlichen Relevanz ihres Auftretens wurde begonnen. Die Grundwasserbibliothek wurde laufend erweitert und enthaelt nun eine zusaetzliche Sammlung der wichtigsten Niphargiden-Beschreibungen. Elektronenmikroskopische Untersuchungen an stygobionten Krebsen (Syncarida) wurden erweitert. Neben dem Maxillennephridium zeigte auch der Darmtrakt spezielle Adaptionen an die schlanke Koerperform und das Leben im Interstitial.

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