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Steinberg, Ronny (2025): Light adaptation patterns in non-native Vaucheria-turfs (Xanthophyceae) on a tidal sedimentary coast - light curve data [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.979243 (DOI registration in progress)

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Published: 2025-04-04

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Abstract:
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.
Keyword(s):
Light curves; non-native species; tidal flats; Vaucheria sp.; Xanthophyceae
Related to:
Steinberg, Ronny (2025): Light adaptation patterns in non-native Vaucheria-turfs (Xanthophyceae) on a tidal sedimentary coast - pigment data [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.971807
Coverage:
Median Latitude: 54.996255 * Median Longitude: 8.411659 * South-bound Latitude: 54.957830 * West-bound Longitude: 8.381070 * North-bound Latitude: 55.027900 * East-bound Longitude: 8.436850
Date/Time Start: 2022-07-13T00:00:00 * Date/Time End: 2022-09-29T00:00:00
Event(s):
Kampen_light_1 * Latitude: 54.957830 * Longitude: 8.381070 * Date/Time: 2022-07-13T00:00:00 * Location: Blidselbucht, Kampen, Sylt, Germany * Method/Device: Sampling by hand (HAND)
Kampen_light_2 * Latitude: 54.957830 * Longitude: 8.381070 * Date/Time: 2022-07-15T00:00:00 * Location: Blidselbucht, Kampen, Sylt, Germany * Method/Device: Sampling by hand (HAND)
Kampen_light_3 * Latitude: 54.957830 * Longitude: 8.381070 * Date/Time: 2022-07-29T00:00:00 * Location: Blidselbucht, Kampen, Sylt, Germany * Method/Device: Sampling by hand (HAND)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventSteinberg, Ronny
2Sampling date/time, experimentDate/time sampling expSteinberg, Ronny
3LATITUDELatitudeSteinberg, RonnyGeocode – of sampling event
4LONGITUDELongitudeSteinberg, RonnyGeocode – of sampling event
5Type of studyStudy typeSteinberg, Ronny
6Date/time analysis, experimentDate/time analysis expSteinberg, Ronny
7SpeciesSpeciesSteinberg, RonnyVisual identification (VID)cf. Velutina
8Species, unique identification (Semantic URI)Species UID (Semantic URI)Steinberg, RonnyVisual identification (VID)cf. Velutina
9Species, unique identification (URI)Species UID (URI)Steinberg, RonnyVisual identification (VID)cf. Velutina
10Sample IDSample IDSteinberg, RonnyVaucheria cf. Velutina; urn:lsid:marinespecies.org:taxname:577616
11ReplicatesRepl#Steinberg, Ronny
12Temperature, waterTemp°CSteinberg, RonnyTemperature data logger, Onset, HOBO Pendant MX Water Temperature Data Logger
13Radiation, photosynthetically activePARµmol/m2/sSteinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100
14Maximum photochemical quantum yield of photosystem IIFv/FmSteinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100
15Electron transport rate of photosystem IIETR PSIISteinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100relative units
16Effective quantum yield of photosystem IIY(II)Steinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100Y=(Fm'-Ft)/Fm'
17Coefficient of photochemical fluorescence quenching of photosystem IIqP=(Fm'-Ft)/(Fm'-Fo)Steinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100
18Coefficient of non-photochemical fluorescence quenching of photosystem IIqN=(Fm-Fm')/(Fm-Fo)Steinberg, RonnyFluorometer, Heinz Walz GmbH, PAM-2100
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
5194 data points

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