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Sinking towards destiny: High throughput measurement of phytoplankton sinking rates through time-resolved fluorescence plate spectroscopy

. Serodio, University of Aveiro, gave generous advice on data transformations. Author Contributions Conceptualization: Catherine C. Bannon, Douglas A. Campbell. Data curation: Catherine C. Bannon, Douglas ... A. Campbell. Formal analysis: Douglas A. Campbell. Funding acquisition: Douglas A. Campbell. Investigation: Catherine C. Bannon, Douglas A. Campbell. Methodology: Catherine C. Bannon, Douglas A

Photoinactivation of Photosystem II in Prochlorococcus and Synechococcus

The marine picocyanobacteria Synechococcus and Prochlorococcus numerically dominate open ocean phytoplankton. Although evolutionarily related they are ecologically distinct, with different strategies to harvest, manage and exploit light. We grew representative strains of Synechococcus and Prochlorococcus and tracked their susceptibility to photoinactivation of Photosystem II under ...

Arctic Micromonas uses protein pools and non-photochemical quenching to cope with temperature restrictions on Photosystem II protein turnover

E4L3M7 , Canada 2 & Douglas A. Campbell 3 Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, CAS , Guangzhou 510301 , China 4 Michigan Technological ... work, assisted in data analysis and figure generation and edited the manuscript. Douglas A. Campbell planned the experiments, wrote the R data processing pipeline to extract kinetic data from the

Rising CO2 Interacts with Growth Light and Growth Rate to Alter Photosystem II Photoinactivation of the Coastal Diatom Thalassiosira pseudonana

We studied the interactive effects of pCO2 and growth light on the coastal marine diatom Thalassiosira pseudonana CCMP 1335 growing under ambient and expected end-of-the-century pCO2 (750 ppmv), and a range of growth light from 30 to 380 µmol photons·m−2·s−1. Elevated pCO2 significantly stimulated the growth of T. pseudonana under sub-saturating growth light, but not under ...

Photophysiology of Bolidomonas pacifica

Bolidomonas pacificais a member of the Bolidophytes, chlorophyll a/cphytoplankters that lack siliceous frustules, in contrast to their sister lineage the diatoms. Under nutrient repletion, B. pacificaachieved a maximum growth rate of ∼0.51 day−1at a growth light of 224 μmol photons m−2s−1, with a light compensation point for growth slightly below 30 μmol photons m−2s−1. The ...

Photophysiological and Photosynthetic Complex Changes during Iron Starvation in Synechocystis sp. PCC 6803 and Synechococcus elongatus PCC 7942

Iron is an essential component in many protein complexes involved in photosynthesis, but environmental iron availability is often low as oxidized forms of iron are insoluble in water. To adjust to low environmental iron levels, cyanobacteria undergo numerous changes to balance their iron budget and mitigate the physiological effects of iron depletion. We investigated changes in key ...

Influence of Cell Size and DNA Content on Growth Rate and Photosystem II Function in Cryptic Species of Ditylum brightwellii

). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: Douglas A. Campbell and Amanda M. Cockshutt are share

Effects of Light, Food Availability and Temperature Stress on the Function of Photosystem II and Photosystem I of Coral Symbionts

Background Reef corals are heterotrophic coelenterates that achieve high productivity through their photosynthetic dinoflagellate symbionts. Excessive seawater temperature destabilises this symbiosis and causes corals to “bleach,” lowering their photosynthetic capacity. Bleaching poses a serious threat to the persistence of coral reefs on a global scale. Despite expanding research ...

Light Variability Illuminates Niche-Partitioning among Marine Picocyanobacteria

Prochlorococcus and Synechococcus picocyanobacteria are dominant contributors to marine primary production over large areas of the ocean. Phytoplankton cells are entrained in the water column and are thus often exposed to rapid changes in irradiance within the upper mixed layer of the ocean. An upward fluctuation in irradiance can result in photosystem II photoinactivation ...