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- W4243025787 abstract "Abstract. Calcified macroalgae are critical components of marine ecosystems worldwide, but face considerable threat both from climate change (increasing water temperatures) and ocean acidification (decreasing ocean pH and carbonate saturation). It is thus fundamental to constrain the relationships between key abiotic stressors and the physiological processes that govern coralline algal growth and survival. Here we characterize the complex relationships between the abiotic environment of rock pool habitats, and the physiology of the geniculate red coralline alga, Corallina officinalis (Corallinales, Rhodophyta). Paired assessment of irradiance, water temperature and carbonate chemistry, with C. officinalis net production (NP), respiration (R) and net calcification (NG) was performed in a south-west UK field site, at multiple temporal scales (seasonal, diurnal and tidal). Strong seasonality was observed in NP and night-time R, with a Pmax of 22.35 μmol DIC gDW−1 h−1, Ek of 300 μmol photons m−2 s−1 and R of 3.29 μmol DIC gDW−1 Ek for the majority of the annual cycle. Over tidal emersion periods, dynamics in NP highlighted the ability of C. officinalis to acquire inorganic carbon despite significant fluctuations in carbonate chemistry. Across all data, NG was highly predictable (R2 = 0.80) by irradiance, water temperature and carbonate chemistry, providing a NGmax of 3.94 μmol CaCO3 gDW−1 h−1, and Ek of 113 μmol photons m−2 s−1. Light-NG showed strong seasonality and significant coupling to NP (R2 = 0.65), as opposed to rock pool water carbonate saturation. In contrast, the direction of dark-NG (dissolution vs. precipitation) was strongly related to carbonate saturation, mimicking abiotic precipitation dynamics. Data demonstrated that C. officinalis is adapted to both long-term (seasonal) and short-term (tidal) variability in environmental stressors, although the balance between metabolic processes and the external environment may be significantly impacted by future climate change." @default.
- W4243025787 created "2022-05-12" @default.
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- W4243025787 date "2017-05-12" @default.
- W4243025787 modified "2023-10-16" @default.
- W4243025787 title "The regulation of coralline algal physiology, an <i>in-situ</i> study of <i>Corallina officinalis</i> (Corallinales, Rhodophyta)" @default.
- W4243025787 doi "https://doi.org/10.5194/bg-2017-135" @default.
- W4243025787 hasPublicationYear "2017" @default.
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