Variable chlorophyll a (Chl a ) fluorescence, a standard tool for assessing phytoplankton physiology, offers a wealth of information on photosynthetic performance and primary productivity through noninvasive means. However, a better understanding of diurnal patterns in photosynthesis is critically important as advanced fluorescence techniques are increasingly used to monitor coastal and oceanic primary productivity rates in si...

We test a newly developed instrument prototype which utilizes time-resolved chlorophyll- a fluorescence techniques and fluctuating light to characterize Symbiodiniaceae functional traits across seven different coral species under cultivation as part of ongoing restoration efforts in the Florida Keys. While traditional chlorophyll- a fluorescence techniques only provide a handful of algal biometrics, the system and protocol we...

Reef‐building corals in the genus Porites are one of the most important constituents of Indo‐Pacific reefs. Many species within this genus tolerate abnormally warm water and exhibit high specificity for particular kinds of endosymbiotic dinoflagellates that cope with thermal stress better than those living in other corals. Still, during extreme ocean heating, some Porites exhibit differences in their stress tolerance. While co...

Here we report the effects of elevated p CO 2 on the model symbiotic anemone Exaiptasia pallida and how its association with three different strains of the endosymbiotic dinoflagellate Symbiodinium minutum (ITS2‐type B1) affects its response. Exposure to elevated p CO 2 (70.9 Pa) for 28 d led to an increased effective quantum yield of PSII in actinic light within two of the alga‐anemone combinations. Autotrophic carbon fixatio...