Citation:

PANGAEA.958950

Name: Photosynthesis versus irradiance curves of Laminaria hyperborea off the island of Helgoland in summer 2014
Published: 2023-06-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: blade gradient; Chlorophyll a; depth gradient; diffuse attenuation coefficient; dry mass/area ratio; Fv/Fm; Helgoland; in situ PAR; Kelp; net primary production; oxygen evolution; photoacclimation; Photosynthesis versus irradiance curves; Primary production

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Published: 2023-06-15 • DOI registered: 2023-07-14

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Abstract:

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. Discs were cut from three different blade regions (5, 25 and 50 cm above the stipe-blade transition zone) and set into photosynthesis versus irradiance (PI) curves. Incident light was generated by a slide projector (Liesegang Dianfant, Leitz Prado, Germany) equipped with a halogen lamp (Osram Xenophot 400 W/36 V, Germany) and 11 Schott neutral gray filters. Eleven light steps were conducted between 0 and 560 µmol photons m-2 s-1. Dark respiration was measured first for 20 mins followed by increasing light steps in 10 min intervals. Oxygen concentration expressed in % air saturation was logged by the OxyView software (Presens, Regensburg, Germany) and corrected for air pressure, salinity and logged temperature according to Tengberg et al. (2006). During post-processing, the oxygen production rate for each photon flux density (PFD) level was calculated by plotting a linear regression model through all O2-values measured during the time interval, and was normalized to either fresh mass (FM, unit: µmol O2 g–1 h–1) or disc surface area (DA, unit: µmol O2 cm–2 h–1).

Keyword(s):

blade gradient; Chlorophyll a; depth gradient; diffuse attenuation coefficient; dry mass/area ratio; Fv/Fm; Helgoland; in situ PAR; Kelp; net primary production; oxygen evolution; photoacclimation; Photosynthesis versus irradiance curves; Primary production

Supplement to:

Franke, Kiara; Matthes, Lisa C; Graiff, Angelika; Karsten, Ulf; Bartsch, Inka (2023): The challenge of estimating kelp production in a turbid marine environment. Journal of Phycology, jpy.13327, https://doi.org/10.1111/jpy.13327

Related to:

Tengberg, Anders; Hovdenes, Jostein; Andersson, Henrik Johan; Brocandel, Olivier; Diaz, Robert; Hebert, David; Arnerich, Tony; Huber, Christian; Körtzinger, Arne; Khripounoff, Alexis; Rey, Francisco; Rönning, Christer; Schimanski, Jens; Sommer, Stefan; Stangelmayer, Achim (2006): Evaluation of a lifetime-based optode to measure oxygen in aquatic systems. Limnology and Oceanography-Methods, 4(2), 7-17, https://doi.org/10.4319/lom.2006.4.7

Funding:

Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. 407670545 : Seasonal kelp primary production at a rocky shore site: Integrating physiology and biochemistry into ecological modelling

Coverage:

Median Latitude: 54.192934 * Median Longitude: 7.872206 * South-bound Latitude: 54.190500 * West-bound Longitude: 7.858880 * North-bound Latitude: 54.197220 * East-bound Longitude: 7.877480

Date/Time Start: 2014-07-24T00:00:00 * Date/Time End: 2014-09-06T00:00:00

Minimum DEPTH, water: 0.45 m * Maximum DEPTH, water: 6.25 m

Event(s):

Helgoland_2014_5 * Latitude: 54.190500 * Longitude: 7.876380 * Date/Time: 2014-08-08T00:00:00 * Elevation: -0.5 m * Location: off Helgoland, North Sea * Campaign: * Basis: Marine Station Helgoland * Method/Device: SCUBA-DIVE * Comment: Algae sampling in a radius of several meters

Helgoland_2014_6 * Latitude: 54.190517 * Longitude: 7.876083 * Date/Time Start: 2014-08-22T00:00:00 * Date/Time End: 2014-09-06T00:00:00 * Elevation: -1.9 m * Location: off Helgoland, North Sea * Campaign: * Basis: Marine Station Helgoland * Method/Device: SCUBA-DIVE * Comment: Algae sampling in a radius of several meters

Helgoland_2014_7 * Latitude: 54.193500 * Longitude: 7.877480 * Date/Time Start: 2014-07-24T00:00:00 * Date/Time End: 2014-08-15T00:00:00 * Elevation: -4.2 m * Location: off Helgoland, North Sea * Campaign: * Basis: Marine Station Helgoland * Method/Device: SCUBA-DIVE * Comment: Algae sampling in a radius of several meters

Comment:

Additional funding was provided by the Postdoctoral fellowship grant of the Fonds de recherche du Québec - Nature et technologies and the Weston Foundation.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Matthes, Lisa C
2	DEPTH, water	Depth water	m	Matthes, Lisa C		Geocode
3	Laminaria hyperborea, blade region	L. hyperborea blade reg	cm	Matthes, Lisa C
4	Replicate	Repl		Matthes, Lisa C
5	Irradiance	E	µmol photons/m²/s	Matthes, Lisa C	Slide projector	photons
6	Oxygen production rate, per fresh mass	O2 prod/fm	µmol/g/h	Matthes, Lisa C	Calculated, see abstract	µmol O2/g/h
7	Oxygen production rate, per disc area	O2 prod/disc area	µmol/cm²/h	Matthes, Lisa C	Calculated, see abstract	µmol O2/cm2/h

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2790 data points

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