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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.

Hypoxie - April 1986

Monitoring stations from monitoring expedition of April 1986 with the oxygen concentration (points). Displayed areas of oxygen concentration (and hydrogen sulphide concentrations in the near bottom layer of the Baltic Sea. More details in the link "Marine Science Reports" (No. 100, chapter 3-5)

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: 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: 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: algae photosynthesis during upwelling event 3 (UPW3)

Photosynthetic performance of macroalgae (assessed by light and dark incubation) during upwelling 3 without or with (+4°C) warming.

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: tank nutrients

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

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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