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Found 212 results.

Sedimentological, geochemical and biological data of sediment cores from lake Tiefer (NE Germany)

The depletion of dissolved oxygen in lakes (hypoxia) is an ongoing phenomenon that put under risk ecological systems and impact sedimentary environments. This phenomenon is driven by the increasing anthropogenic pressure on such environments. This dataset contains high-resolution sedimentological, geochemical and biological depth series of selected short sediment cores from lake Tiefer See (NE Germany). Those cores cover the recent transition from homogeneous to laminated sediments (~100 years ago), a transition that reflect the onset of hypoxic conditions in the lake. The cores were taken from different locations and water depths across the lake and allow to trace the spatiotemporal evolution of hypoxia spread in the lake.

Physiological data of Pacific oyster Crassostrea (Magallana) gigas after exposure to intermittent hypoxia and the combination with (fluctuating) elevated temperature

Organisms in intertidal zones experience fluctuations in environmental stressors such as hypoxia and temperature. These stressors and their fluctuations often appear in combination. Combination of stressors can have different effects compared to single stressors. In this study, we investigate the physiological effects of intermittent hypoxia in combination with different temperature regimes on the Pacific Oyster Crassostrea (Magallana) gigas. The oysters were exposed to hypoxic cycles (12h hypoxia by emersion/12h submersion) at normal (15°C), elevated (30°C) or fluctuating (15°C submersion/30°C emersion) temperature for 10 days. After the last submersion phase, the gills and digestive gland were sampled. We measured markers for bioenergetics and redox-balance in the gills and digestive gland using colorimetric methods as well as a set of metabolites (predominantly amino acids, osmolytes, anaerobic end products and energetic metabolites) in the gills using LC-MS/MS. Oysters kept submerged for up to 10 days were used as controls.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: grazer survival under hypoxia

Survival rates of major grazer taxa (Gammarus sp., Idotea, sp., Littorina sp. and Rissoa sp.) exposed to upwelling-induced hypoxia.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: tank abiotics

Temperature, pH, salinity and oxygen logged and measured in the tanks.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: grazing Idotea on Fucus during upwelling event 3 (UPW3)

Grazing rates of the isopod Idotea sp. on the macroalga Fucus vesiculosus during upwelling 3 in response to warming and upwelling.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: macroalgae growth

Impact of warming and upwelling on macroalgal growth (expressed as anomaly or z-growth).

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: hourly means of temperature and oxygen

Hourly means of temperature and oxygen as logged in the tanks.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: tank nutrients

Weekly measures of nutrients (silicate, nitrate, nitrite, phosphate, ammonium) in the tanks.

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: abundances of major grazer species

Abundances (numbers) of major grazer species in the tanks as assessed by subsamples taken at three time points (before upwelling 2 and 3 and between the two upwelling events).

Kiel Outdoor Benthoscosm experiment 2018 on ocean warming and upwelling: microfouling during upwelling event 3 (UPW3)

Microfouling (expressed as cell numbers per cm2) by bacteria and diatoms in response to warming (+0, 2 and 4°C) and upwelling during upwelling event 3.

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