Parameter: ETR

Short Description: Electron Transport Rate (ETR)
Short Name: ETR
Official Name: ETR
Units: typically umol electrons m-2 s-1
External Identifiers:
skos:narrowMatch: http://vocab.nerc.ac.uk/collection/P01/current/ETRMXF01/
skos:narrowMatch: http://vocab.nerc.ac.uk/collection/P01/current/ETRRXF01/
skos:narrowMatch: http://vocab.nerc.ac.uk/collection/P01/current/XETRMF01/

Description

Electron Transport Rate (ETR) including relative ETR, max ETR, and ETR change.

Electron transport rate (ETR), estimated from chlorophyll fluorescence, is a widely-used indicator of photosynthetic activity (Kitao et al., 2021).  It is used in pulse amplitude modulated (PAM) technology to calculate photosynthesis as the electron transport rate (ETR) through Photosystem II (PSII) (​Ritchie, 2012).  

Kitao, M., Yasuda, Y., Kodani, E., Harayama, H., Awaya, Y., Komatsu, M., ... & Agathokleous, E. (2021). Integration of electron flow partitioning improves estimation of photosynthetic rate under various environmental conditions based on chlorophyll fluorescence. Remote Sensing of Environment, 254, 112273. doi: 10.1016/j.rse.2020.112273

Ritchie, R. J. (2012). Photosynthesis in the blue water lily (Nymphaea caerulea Saligny) using pulse amplitude modulation fluorometry. International Journal of Plant Sciences, 173(2), 124-136. doi: 10.1086/663168

DatasetPI-Supplied DescriptionPI-Supplied Name
Temperature and pCO2 effects on survivability of 25 genotypes of Acropora cervicornis coral at Mote Marine Laboratory in Nov-Dec 2019Difference in electron transport rate (ETR) between pre and post exposure Change_in_ETR
Temperature and pCO2 effects on survivability of 25 genotypes of Acropora cervicornis coral at Mote Marine Laboratory in Nov-Dec 2019Electron transport rate (ETR) after exposure to treatments Post_Exposure_ETR
Temperature and pCO2 effects on survivability of 25 genotypes of Acropora cervicornis coral at Mote Marine Laboratory in Nov-Dec 2019Electron transport rate (ETR) prior to exposure to treatments Pre_Exposure_ETR
Coral pulse amplitude modulation (PAM) throughout a heat temperature study conducted in aquaria at Brewer’s Bay, St. Thomas, The U.S. Virgin Islands in June of 2017Electron Transport Rate (ETR) ETR
Imaging pulse amplitude modulator fluorometer data collected from Acropora cervicornis under different pH and temperature treatments from experiments at Summerland Key, Florida from July to September 2017change in the maximum level of electron transport rate between July and September 2017 mETR
Imaging pulse amplitude modulator fluorometer data collected during Acropora cervicornis experiments at Summerland Key, Florida from July to September of 2016Maximum level of electron transport rate mETR
Underwater fluorescence on nearshore reefs in Guam during 2014 (Reef Resilience in Guam project)electron transport rate; measure of overall photosynthetic capacity ETR
Steady state photosynthesis (photosynthetic induction time) from Porites astreoides colonies in St. John, US Virgin Islands from July to August of 2019Maximum relative Electron Transport Rate reported by the diving PAM during induction protocol Max_rETR
Steady state photosynthesis (photosynthetic induction time) from Porites astreoides colonies in St. John, US Virgin Islands from July to August of 2019Mean relative Electron Transport Rate  of the last three points reported by the diving PAM during the induction protocol." Mean_rETR_3pts
Pulse Amplitude Modulation (PAM) fluorometer measurements from Porites astreoides colonies in St. John, US Virgin Islands from July to August of 2019relative Electron Transport Rate reported by the PAM from Porites astreoides after each saturation pulse. rETR
CTD-associated variables, bottle salinity measurements, oxygen titrations, nutrient analyses, biogeochemical/biological variables, and DIC chemistry variables from R/V Thomas G. Thompson cruise TN376 from January to March 2020Electron transfer rate (ETR) at a given irradiance Avg_ETR
Results from experiment examining Zostera marina genotype response to warming from the Bodega Marine LaboratoryTerminal shoot ETRMAX (the asymptote of the curve—a measure of photosystem capacity to use absorbed light by Pulse Amplitude Modulation). ETR_max
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Funded by the U.S. National Science Foundation