Description: Laminaria hyperborea off the island of Helgoland (North Sea, Germany) was sampled along a depth gradient (0.5, 2, 4, 6 m) throughout summer 2014. Chlorophyll a content was measured. Discs were cut from three different blade regions (5, 25 and 50 cm above the stipe-blade transition zone) and normalized to either dry mass, fresh mass or disc area. The samples were freeze-dried for approximately 36 h (Beta 1–8 LDplus, Christ, Osterode am Harz, Germany), finely ground for several minutes using steel grinding balls (3 mm diameter) in a Mikro-Dismembrator U (Braun Biontech International, Melsungen, Germany), cooled centrifuged (Centrifuge 3K10, Sigma, Osterode, Germany), and measured in the spectrophotometer (U-3310, Hitachi High-Tech, Japan) at two wavelengths (347 and 664.5 nm).
Global identifier:
Doi(
"10.1594/PANGAEA.958897",
)
Measurements(
Measurements {
domain: Unspecified,
station: None,
measured_variables: [
"Event label",
"DEPTH, water",
"Laminaria hyperborea, blade region",
"Replicate",
"Chlorophyll a, per dry mass",
"Chlorophyll a per fresh mass",
"Chlorophyll a per disc area",
],
methods: [
"Spectrophotometer, Hitachi High-Tech, U-3310",
"Spectrophotometer, Hitachi High-Tech, U-3310",
"Spectrophotometer, Hitachi High-Tech, U-3310",
],
},
)
Dataset
Comment: Additional funding was provided by the Postdoctoral fellowship grant of the Fonds de recherche du Québec - Nature et technologies and the Weston Foundation.
Origins: /Wissenschaft/PANGAEA
Tags: Helgoland ? Insel ? Stahl ? Nordsee ? Chlorophyll a ? Fv/Fm ? Kelp ? Photosynthesis versus irradiance curves ? Primary production ? blade gradient ? depth gradient ? diffuse attenuation coefficient ? dry mass/area ratio ? in situ PAR ? net primary production ? oxygen evolution ? photoacclimation ?
Region: off Helgoland, North Sea
Bounding boxes: 7.85888° .. 7.87748° x 54.1905° .. 54.19722°
License: cc-by/4.0
Language: Englisch/English
Issued: 2023-06-15
Modified: 2023-06-15
Time ranges: 2014-07-24 - 2014-09-06
Accessed 1 times.