Citation:

PANGAEA.958950

Name: Photosynthesis versus irradiance curve parameters 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. PI curves were fitted by minimizing the sum of differences between the measured oxygen flux and the model proposed by Jassby and Platt (1976). Parameters were normalized to fresh mass and area.

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:

Jassby, Alan D; Platt, Trevor (1976): Mathematical formulation of the relationship between photosynthesis and light for phytoplankton. Limnology and Oceanography, 21(4), 540-547, https://doi.org/10.4319/lo.1976.21.4.0540

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	Maximum oxygen production rate, per fresh mass	Pmax/fm	µmol/g/h	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	µmol O2/g/h
6	Light utilization coefficient, per fresh mass	alpha fm	(µmol O2/g/h)/(µmol photons/m²/s)	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)
7	Light saturation point	Ik	µmol/m²/s	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	photons
8	Light compensation point	Ic	µmol /m²/s	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	photons
9	Dark respiration rate, oxygen, per fresh mass	Dark resp O2/fm	µmol/g/h	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	µmol O2/g/h
10	Maximum oxygen production rate, per disc area	Pmax/disc area	µmol/cm²/h	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	µmol O2/cm2/h
11	Light utilization coefficient, per disc area	alpha disc area	(µmol O2/cm²/h)/(µmol photons/m²/s)	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)
12	Light saturation point	Ik	µmol/m²/s	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	photons
13	Light compensation point	Ic	µmol /m²/s	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	photons
14	Dark respiration rate, oxygen, per disc area	Dark resp O2/disc area	µmol/cm²/h	Matthes, Lisa C	Calculated according to Jassby & Platt (1976)	µmol O2/cm2/h

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

576 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Depth water [m]	3 L. hyperborea blade reg [cm]	4 Repl	5 Pmax/fm [µmol/g/h] (µmol O2/g/h)	6 alpha fm [(µmol O2/g/h)/(µmol photons/m²/s)]	7 Ik [µmol/m²/s] (photons)	8 Ic [µmol /m²/s] (photons)	9 Dark resp O2/fm [µmol/g/h] (µmol O2/g/h)	10 Pmax/disc area [µmol/cm²/h] (µmol O2/cm2/h)	11 alpha disc area [(µmol O2/cm²/h)/(µmol photons/m²/s)]	12 Ik [µmol/m²/s] (photons)	13 Ic [µmol /m²/s] (photons)	14 Dark resp O2/disc area [µmol/cm²/h] (µmol O2/cm2/h)
Helgoland_2014_6	1.88	5	1	8.645	0.114	75.576	9.871	-1.129	2.793	0.037	75.578	9.871	-0.365
Helgoland_2014_6	1.88	25	1	18.512	0.215	85.934	1.744	-0.376	3.438	0.040	85.935	1.744	-0.070
Helgoland_2014_6	1.88	50	1	21.188	0.280	75.774	2.763	-0.772	3.189	0.042	75.776	2.762	-0.116
Helgoland_2014_6	1.88	5	2	12.947	0.145	89.565	0.737	-0.107	3.697	0.041	89.568	0.737	-0.030
Helgoland_2014_6	1.88	25	2	13.593	0.282	48.244	4.176	-1.177	2.673	0.055	48.245	4.176	-0.231
Helgoland_2014_6	1.88	50	2	31.738	0.353	90.003	0.428	-0.151	4.505	0.050	90.004	0.428	-0.021
Helgoland_2014_6	1.88	5	3	12.813	0.192	66.852	3.614	-0.693	3.688	0.055	66.853	3.613	-0.199
Helgoland_2014_6	1.88	25	3	15.539	0.284	54.725	5.511	-1.565	2.813	0.051	54.726	5.511	-0.283
Helgoland_2014_6	1.88	50	3	22.452	0.389	57.730	3.515	-1.367	2.594	0.045	57.731	3.515	-0.158
Helgoland_2014_6	1.88	5	4	16.253	0.201	80.742	3.760	-0.757	4.663	0.058	80.742	3.760	-0.217
Helgoland_2014_6	1.88	25	4	20.047	0.326	61.564	5.600	-1.824	3.474	0.056	61.565	5.600	-0.316
Helgoland_2014_6	1.88	50	4	25.558	0.423	60.467	14.662	-6.198	3.135	0.052	60.467	14.663	-0.760
Helgoland_2014_6	1.88	5	5	16.860	0.162	104.186	8.723	-1.412	4.663	0.045	104.189	8.723	-0.390
Helgoland_2014_6	1.88	25	5	13.065	0.252	51.902	6.661	-1.677	2.376	0.046	51.903	6.661	-0.305
Helgoland_2014_6	1.88	50	5	32.725	0.465	70.376	7.156	-3.328	4.166	0.059	70.377	7.156	-0.424
Helgoland_2014_6	1.88	5	6	9.398	0.139	67.766	8.055	-1.117	3.083	0.045	67.767	8.055	-0.366
Helgoland_2014_6	1.88	25	6	11.420	0.239	47.842	9.971	-2.380	2.302	0.048	47.842	9.971	-0.480
Helgoland_2014_6	1.88	50	6	26.534	0.441	60.200	6.590	-2.905	3.625	0.060	60.200	6.590	-0.397
Helgoland_2014_7	4.25	5	1	9.755	0.150	64.823	16.004	-2.408	3.022	0.047	64.823	16.004	-0.746
Helgoland_2014_7	4.25	25	1	19.953	0.245	81.376	11.903	-2.919	3.512	0.043	81.377	11.903	-0.514
Helgoland_2014_7	4.25	50	1	16.837	0.410	41.035	6.480	-2.659	2.070	0.050	41.035	6.480	-0.327
Helgoland_2014_7	4.25	5	2	9.257	0.159	58.104	30.185	-4.809	2.810	0.048	58.104	30.186	-1.460
Helgoland_2014_7	4.25	25	2	15.875	0.191	83.049	15.045	-2.876	3.361	0.040	83.051	15.045	-0.609
Helgoland_2014_7	4.25	50	2	17.819	0.341	52.263	7.498	-2.556	2.353	0.045	52.263	7.498	-0.338
Helgoland_2014_7	4.25	5	3	13.364	0.152	87.765	13.284	-2.023	3.605	0.041	87.767	13.284	-0.546
Helgoland_2014_7	4.25	25	3	16.066	0.203	78.965	11.702	-2.381	3.305	0.042	78.967	11.702	-0.490
Helgoland_2014_7	4.25	50	3	18.301	0.316	57.828	19.424	-6.147	2.462	0.043	57.829	19.425	-0.827
Helgoland_2014_7	4.25	5	4	10.410	0.149	69.779	7.542	-1.125	3.235	0.046	69.780	7.542	-0.350
Helgoland_2014_7	4.25	25	4	11.241	0.088	127.359	32.984	-2.911	2.146	0.017	127.366	32.984	-0.556
Helgoland_2014_7	4.25	50	4	22.879	0.350	65.388	8.180	-2.862	2.916	0.045	65.390	8.180	-0.365
Helgoland_2014_7	4.25	5	5	8.997	0.106	84.635	9.507	-1.011	2.589	0.031	84.637	9.506	-0.291
Helgoland_2014_7	4.25	25	5	17.556	0.603	29.135	6.453	-3.888	3.388	0.116	29.135	6.453	-0.750
Helgoland_2014_7	4.25	50	5	20.217	0.235	85.912	6.477	-1.524	2.662	0.031	85.914	6.476	-0.201
Helgoland_2014_7	4.25	5	6	10.700	0.137	78.147	14.695	-2.012	2.870	0.037	78.149	14.695	-0.540
Helgoland_2014_7	4.25	25	6	15.738	0.243	64.862	9.302	-2.257	3.067	0.047	64.837	9.973	-0.472
Helgoland_2014_7	4.25	50	6	27.742	0.463	59.869	7.072	-3.277	3.670	0.061	59.869	7.072	-0.434
Helgoland_2014_5	0.45	25	1	21.797	0.330	66.031	3.038	-1.003	3.890	0.059	66.032	3.038	-0.179
Helgoland_2014_5	0.45	25	2	16.646	0.257	64.724	6.353	-1.634	3.744	0.058	64.725	6.353	-0.368
Helgoland_2014_5	0.45	25	3	12.159	0.205	59.180	9.560	-1.964	2.488	0.042	59.181	9.560	-0.402
Helgoland_2014_5	0.45	25	4	12.599	0.224	56.238	9.243	-2.071	2.671	0.047	56.239	9.243	-0.439
Helgoland_2014_5	0.45	25	5	27.843	0.368	75.751	6.892	-2.533	4.591	0.064	71.678	6.948	-0.445
Helgoland_2014_5	0.45	25	6	17.756	0.193	92.207	7.256	-1.397	3.388	0.037	92.209	7.256	-0.267
Helgoland_2014_8	6.25	25	1	22.462	0.265	84.624	7.366	-1.955	3.295	0.039	84.625	7.366	-0.287
Helgoland_2014_8	6.25	25	2	20.109	0.236	85.099	7.312	-1.728	3.924	0.064	61.493	7.649	-0.488
Helgoland_2014_8	6.25	25	3	18.766	0.221	84.980	13.733	-3.033	3.342	0.039	84.983	13.733	-0.540
Helgoland_2014_8	6.25	25	4	23.185	0.299	77.639	9.656	-2.884	3.893	0.048	80.557	8.682	-0.420
Helgoland_2014_8	6.25	25	5	14.119	0.199	70.988	8.449	-1.680	2.940	0.046	63.897	10.798	-0.497
Helgoland_2014_8	6.25	25	6	20.959	0.307	68.362	8.652	-2.653	4.119	0.060	68.363	8.652	-0.521