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            <gco:CharacterString>Cite this dataset as: Passow, U., Laws, E., Sweet, J. (2020) Series 1B-3: Multiple stressor experiments on T. pseudonana (CCMP1335) – computed data from the LC3 protocol for samples at 4 temperatures, 15-26C. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-11-12 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.829009.1 [access date]</gco:CharacterString>
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        <gco:CharacterString>Series 1B: photophysiology Dataset Description: &amp;lt;p&amp;gt;The raw fluorescence data can be found under the Data Files section as an Excel file and as individual .csv files.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Experimental setup:&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;The experiments were designed to test the combined effects of four temperatures, and eight light intensities on growth and photophysiology of the diatom T. pseudonana CCMP1335 in a multifactorial design. Four temperatures were tested: 15°C, 18°C, 22°C, and 26°C. Within each temperature, eight light levels were tested: 30, 40, 70,90,105,125,140 and 265 µmol photons · m-2 · s-1. All lights were set at a 12 h day: 12 h dark cycle. For logistical reasons, experiments were partially conducted in series.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Experiments were conducted in Multicultivator MC-1000 OD units (Photon Systems Instruments, Drasov, Czech Republic). Each unit consists of eight 85 ml test-tubes immersed in a thermostated water bath, each independently illuminated by an array of cool white LEDs set at specific intensity and timing. A 0.2µm filtered ambient air was bubbled through sterile artificial seawater, and the humidified air was supplied to each tube&amp;amp;nbsp; Each experiment was split into two phases: An acclimation phase spanning 3 days, was used to acclimate cultures to their new environment. Pre-acclimated, exponentially-growing cultures were then inoculated into fresh media and incubated through a 4-day experimental phase during which assessments of growth, photophysiology, and nutrient cycling were carried out daily. All sampling started 6 hours into the daily light cycle to minimize the effects of diurnal cycles.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Experiments were conducted with artificial seawater (ASW) prepared using previously described methods (Kester et. al 1967), and enriched with 50mL per liter of UV sterilized natural seawater and nitrate (NO3), phosphate (PO4), silicic acid (Si[OH]4), at levels ensuring that the cultures would remain nutrient-replete over the course of the experiment. Trace metals and vitamins were added as in f/2 (Guillard 1975). The pH of the growth media was measured spectrophotometrically using the m-cresol purple method (Dickson 1993), and adjusted using 0.1N HCl or 0.1M NaOH.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Photophysiology&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;amp;nbsp;Photophysiology was assessed daily using a handheld Pulse Amplitude Modulated (PAM) fluorometer (AquaPen-C AP-C 100, Photon System Instruments, Czech Republic). A sample was collected from each light treatment for each, 5 hours after the start of the daily light cycle, and placed in the dark for a minimum of 30 minutes prior to measurements. The dark-adapted sample was used to generate light curves that provide measurements of in-vivo chlorophyll autofluorescence (F0), the maximum quantum yield (QYmax or Fv/Fm), and relative photosynthesis rates based on PSII quantum yields at varying light intensities - using the instrument’s LC3 protocol. The LC3 protocol involves measurements of baseline and maximal fluorescence over seven 60-second phases, with each phase representing a light intensity from 10 to 1000 μmol photons m-2 · s-1.&amp;amp;nbsp; Blue light (455 nm) was used as actinic light in these experiments, and measurements were made at measuring illumination (f-pulse) intensity of 0.03 μmol photons m-2 · s-1, and saturating (F-pulse) illumination of 2100 μmol photons m-2 · s-1, and actinic illumination (A-pulse) controlled by the instrument’s protocol were set at 10, 20, 50, 100, 300, 500, and 1000&amp;amp;nbsp; μmol photons m-2 · s-1 (for each 60-second phase).&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/654346.rdf" xlink:title="OCE-1538602" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1538602 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1538602</gmx:Anchor>
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	Name: Phase
	Units: unitless
	Description: &lt;p&gt;Indicates whether the sample was collected during the acclimation phase or the experiment phase of the experiment.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829072.rdf
	Name: Temperature
	Units: degrees Celsius
	Description: &lt;p&gt;Indicates the temperature at which the samples were incubated.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829073.rdf
	Name: Day
	Units: unitless
	Description: &lt;p&gt;Indicates the timepoint (day) of sampling. D0 = day 0; D1 = day 1; etc.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829074.rdf
	Name: Replicate
	Units: unitless
	Description: &lt;p&gt;Indicates replication within a treatment. &amp;quot;NA&amp;quot; indicates &amp;quot;not applicable&amp;quot;&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829075.rdf
	Name: Irradiance
	Units: unitless
	Description: &lt;p&gt;Irradiance level: SOL = sub-optimum light; OL = optimum light; EL = extreme light&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829076.rdf
	Name: Fo
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;minimum fluorescence in dark-adapted state.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829077.rdf
	Name: Fm
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;the maximum fluorescence in dark-adapted state; measured during the first saturation flash after dark adaptation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829078.rdf
	Name: QY_max
	Units: unitless
	Description: &lt;p&gt;The maximum Quantum yield. A measure of the Photosystem II efficiency. In a dark-adapted sample this is equivalent to Fv/Fm. In a light-adapted sample it is equivalent to Fv’/Fm’.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829079.rdf
	Name: Fm_L1
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The first measurement of the maximum fluorescence following exposure to actinic light at 10 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829080.rdf
	Name: Fm_L2
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The second measurement of the maximum fluorescence following exposure to actinic light at 20 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829081.rdf
	Name: Fm_L3
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The third measurement of the maximum fluorescence following exposure to actinic light at 50 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829082.rdf
	Name: Fm_L4
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The fourth measurement of the maximum fluorescence following exposure to actinic light at 100 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829083.rdf
	Name: Fm_L5
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The fifth measurement of the maximum fluorescence following exposure to actinic light at 300 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829084.rdf
	Name: Fm_L6
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The sixth measurement of the maximum fluorescence following exposure to actinic light at 500 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829085.rdf
	Name: Fm_L7
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The seventh measurement of the maximum fluorescence following exposure to actinic light at 1000 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829086.rdf
	Name: Ft_L1
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The first measurement of the maximum fluorescence following exposure to actinic light at 10 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829087.rdf
	Name: Ft_L2
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The second measurement of the maximum fluorescence following exposure to actinic light at 20 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829088.rdf
	Name: Ft_L3
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The third measurement of the maximum fluorescence following exposure to actinic light at 50 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829089.rdf
	Name: Ft_L4
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The fourth measurement of the maximum fluorescence following exposure to actinic light at 100 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829090.rdf
	Name: Ft_L5
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The fifth measurement of the maximum fluorescence following exposure to actinic light at 300 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829091.rdf
	Name: Ft_L6
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The sixth measurement of the maximum fluorescence following exposure to actinic light at 500 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829092.rdf
	Name: Ft_L7
	Units: RFU (Relative Fluorscence Units)
	Description: &lt;p&gt;The seventh measurement of the maximum fluorescence following exposure to actinic light at 1000 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829093.rdf
	Name: QY_L1
	Units: unitless
	Description: &lt;p&gt;The first measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 10 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829094.rdf
	Name: QY_L2
	Units: unitless
	Description: &lt;p&gt;The second measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 20 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829095.rdf
	Name: QY_L3
	Units: unitless
	Description: &lt;p&gt;The third measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 50 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829096.rdf
	Name: QY_L4
	Units: unitless
	Description: &lt;p&gt;The fourth measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 100 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829097.rdf
	Name: QY_L5
	Units: unitless
	Description: &lt;p&gt;The fifth measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 300 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829098.rdf
	Name: QY_L6
	Units: unitless
	Description: &lt;p&gt;The sixth measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 500 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/829099.rdf
	Name: QY_L7
	Units: unitless
	Description: &lt;p&gt;The seventh measurement of the instantenous photosystem II quantum yield following exposure to actinic light at 1000 micro-mol photons·m-2·sec-1 for 60 seconds (L1 indicates the first measurement in the &amp;quot;light&amp;quot; phase)&lt;/p&gt; 
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&amp;lt;p&amp;gt;The experiments were designed to test the combined effects of four temperatures, and eight light intensities on growth and photophysiology of the diatom T. pseudonana CCMP1335 in a multifactorial design. Four temperatures were tested: 15°C, 18°C, 22°C, and 26°C. Within each temperature, eight light levels were tested: 30, 40, 70,90,105,125,140 and 265 µmol photons · m-2 · s-1. All lights were set at a 12 h day: 12 h dark cycle. For logistical reasons, experiments were partially conducted in series.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Experiments were conducted in Multicultivator MC-1000 OD units (Photon Systems Instruments, Drasov, Czech Republic). Each unit consists of eight 85 ml test-tubes immersed in a thermostated water bath, each independently illuminated by an array of cool white LEDs set at specific intensity and timing. A 0.2µm filtered ambient air was bubbled through sterile artificial seawater, and the humidified air was supplied to each tube&amp;amp;nbsp; Each experiment was split into two phases: An acclimation phase spanning 3 days, was used to acclimate cultures to their new environment. Pre-acclimated, exponentially-growing cultures were then inoculated into fresh media and incubated through a 4-day experimental phase during which assessments of growth, photophysiology, and nutrient cycling were carried out daily. All sampling started 6 hours into the daily light cycle to minimize the effects of diurnal cycles.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Experiments were conducted with artificial seawater (ASW) prepared using previously described methods (Kester et. al 1967), and enriched with 50mL per liter of UV sterilized natural seawater and nitrate (NO3), phosphate (PO4), silicic acid (Si[OH]4), at levels ensuring that the cultures would remain nutrient-replete over the course of the experiment. Trace metals and vitamins were added as in f/2 (Guillard 1975). The pH of the growth media was measured spectrophotometrically using the m-cresol purple method (Dickson 1993), and adjusted using 0.1N HCl or 0.1M NaOH.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Photophysiology&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;amp;nbsp;Photophysiology was assessed daily using a handheld Pulse Amplitude Modulated (PAM) fluorometer (AquaPen-C AP-C 100, Photon System Instruments, Czech Republic). A sample was collected from each light treatment for each, 5 hours after the start of the daily light cycle, and placed in the dark for a minimum of 30 minutes prior to measurements. The dark-adapted sample was used to generate light curves that provide measurements of in-vivo chlorophyll autofluorescence (F0), the maximum quantum yield (QYmax or Fv/Fm), and relative photosynthesis rates based on PSII quantum yields at varying light intensities - using the instrument’s LC3 protocol. The LC3 protocol involves measurements of baseline and maximal fluorescence over seven 60-second phases, with each phase representing a light intensity from 10 to 1000 μmol photons m-2 · s-1.&amp;amp;nbsp; Blue light (455 nm) was used as actinic light in these experiments, and measurements were made at measuring illumination (f-pulse) intensity of 0.03 μmol photons m-2 · s-1, and saturating (F-pulse) illumination of 2100 μmol photons m-2 · s-1, and actinic illumination (A-pulse) controlled by the instrument’s protocol were set at 10, 20, 50, 100, 300, 500, and 1000&amp;amp;nbsp; μmol photons m-2 · s-1 (for each 60-second phase).&amp;lt;/p&amp;gt;</gco:CharacterString>
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