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Calcified macroalgae are critical components of marine ecosystems worldwide, but face considerable threat both from\udclimate change (increasing water temperatures) and ocean acidification (decreasing ocean pH and carbonate saturation). It\udis thus fundamental to constrain the relationships between key abiotic stressors and the physiological processes that\udgovern coralline algal growth and survival. Here we characterize the complex relationships between the abiotic environment\udof rock pool habitats and the physiology of the geniculate red coralline alga, Corallina officinalis\ud(Corallinales, Rhodophyta). Paired assessment of irradiance, water temperature and carbonate chemistry, with\udC. officinalis net production (NP), respiration (R) and net calcification (NG) was performed\udin a south-western UK field site, at multiple temporal scales (seasonal, diurnal and tidal). Strong seasonality was observed\udin NP and night-time R, with a Pmax of 22.35 µmol DIC (g DW)−1 h−1, Ek of\ud300 µmol photons m−2 s−1 and R of 3.29 µmol DIC (g DW)−1 h−1 determined across\udthe complete annual cycle. NP showed a significant exponential relationship with irradiance (R2 = 0.67),\udalthough was temperature dependent given ambient irradiance  > Ek for the majority of the annual cycle. Over tidal\udemersion periods, dynamics in NP highlighted the ability of C. officinalis to acquire inorganic carbon\uddespite 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\ud3.94 µmol CaCO3 (g DW)−1 h−1 and Ek of\ud113 µmol photons m−2 s−1. Light NG showed strong seasonality and significant coupling to\udNP (R2 = 0.65) as opposed to rock pool water carbonate saturation. In contrast, the direction of\uddark NG (dissolution vs. precipitation) was strongly related to carbonate saturation, mimicking abiotic\udprecipitation dynamics. Data demonstrated that C. officinalis is adapted to both long-term (seasonal) and\udshort-term (tidal) variability in environmental stressors, although the balance between metabolic processes and the\udexternal environment may be significantly impacted by future climate change

The regulation of coralline algal physiology, an in situ study of &lt;i&gt;Corallina officinalis&lt;/i&gt; (Corallinales, Rhodophyta)

The regulation of coralline algal physiology, an in situ study of <i>Corallina officinalis</i> (Corallinales, Rhodophyta)