Description: In this study, measurements of the light curve were taken to assess photosynthetic competence in Vaucheria algae. The Chl a fluorescence of photosystem II (PSII) was measured using a pulse amplitude modulated fluorometer. The maximum quantum yield (Fv/Fm) and electron transport rates (ETR) were determined in dark-adapted samples. The light curves were measured by varying the light intensity in 10 steps and recording the effective quantum yield. The data were then analysed using a model known as the photosynthetic light response curve, which describes the relationship between ETR and light intensity. The model assumes that ETR increases linearly with light intensity at low levels, but then slows down and approaches a maximum value (ETRmax) at higher light intensities. The half-saturation constant (k) represents the light intensity at which the ETR is half its maximum. These parameters, ETRmax and k, play a crucial role in understanding the photosynthetic properties of algae under different light conditions. The data were analysed using nonlinear least squares estimates of the parameters in R Studio.
Global identifier:
Doi(
"10.1594/PANGAEA.979243",
)
Measurements(
Measurements {
domain: Unspecified,
station: None,
measured_variables: [
"Event label",
"Sampling date/time, experiment",
"LATITUDE",
"LONGITUDE",
"Type of study",
"Date/time analysis, experiment",
"Species",
"Species, unique identification (Semantic URI)",
"Species, unique identification (URI)",
"Sample ID",
"Replicates",
"Temperature, water",
"Radiation, photosynthetically active",
"Maximum photochemical quantum yield of photosystem II",
"Electron transport rate of photosystem II",
"Effective quantum yield of photosystem II",
"Coefficient of photochemical fluorescence quenching of photosystem II",
"Coefficient of non-photochemical fluorescence quenching of photosystem II",
],
methods: [
"Visual identification",
"Visual identification",
"Visual identification",
"Temperature data logger, Onset, HOBO Pendant MX Water Temperature Data Logger",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
"Fluorometer, Heinz Walz GmbH, PAM-2100",
],
},
)
Dataset
Origins: /Wissenschaft/PANGAEA
Tags: Geografische Koordinaten ? Strahlung ? Gebietsfremde Art ? Daten ? Studie ? Wasserprobe ? Wasseruntersuchung ? Algen ? Küste ? Light curves ? Vaucheria sp. ? Xanthophyceae ? tidal flats ?
Region: Kampen (Sylt) Königshafen
Bounding boxes: 8.38107° .. 8.43685° x 54.95783° .. 55.0279° 8.35° .. 8.35° x 54.95° .. 54.95° 8.41589° .. 8.41589° x 55.04137° .. 55.04137°
License: cc-by/4.0
Language: Englisch/English
Issued: 2025-04-04
Modified: 2025-04-04
Time ranges: 2022-07-13 - 2022-09-29
Accessed 1 times.