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The effects of UVB on growth and productivity and photoadaptations of bottom ice algae at Cape Evans, McMurdo Sound

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: The effects of UVB on growth and productivity and photoadaptations of bottom ice algae at Cape Evans, McMurdo Sound
Description:
Abstract:
Sea ice hosts a large community of algae which is released into the food chain when the ice melts. The sea ice algae grow rapidly in the Antarctic spring at a time that coincides with the ozone hole and when sea ice is most transparent to UVB. They are a good organism to study for the analysis of the effects of UVB on the Southern Ocean food chain. The changes in photosynthetic rate and the effects of UVB on the growth of sea ice algae was investigated at Cape Evans over several seasons by altering the UVB flux over four areas of sea ice providing plots of different UV treatment: 1) photosynthetically active radiation (PAR) only, 2) PAR + UVA, 3) PAR + UVA + UVB, and 4) PAR + UVA + enhanced UVB; in the second season, this plot was a control and was therefore ambient PAR + UVA + UVB. A light fitting with 6 UVB fluorescent tubes was set in a shallow trough cut in the ice to provide additional UVB radiance above ambient for plot 3 in season two as well. Samples from the bottom 100mm of ice cores were taken over two weeks, melted and analysed for changes in photosynthetic pigments, mycosporine like amino acids, total cell numbers, species composition and carbon, nitorgen and phosphorous content. A PUV500 submersible multichannel radiometer was used to measure UVB and visible radiation both above and beneath the ice. Oxygen microelectrodes were deployed under the ice. A CTD probe (conductivity, temperature and depth) was sent to the bottom of the bay (c. 35m) at 1pm each day. The probe records a profile of these physical parameters and also records chlorophyll levels of the phytoplankton in the water. Photosynthetic rates in situ were measured using PAM fluorescence techniques. It was used on small samples in the laboratory and was also deployed remotely under the ice. By taking measurements from early morning to midday, the adaptations the algae photosynthetic system made to the increasing radiation (photoacclimation) was observed and then as intensity passed through the maximum at solar noon, the delay in algal response to changing light intensity was measured.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Ryan, K.G. Hegseth, E.N. Martin, A. Davy, S.K. O’Toole, R. Ralph, P.J. McMinn, A. Thorn, C.J. 2006 Comparison of the microalgal community within fast ice at two sites along the Ross Sea coast, Antarctica. Antarctic science 18(4): 583-594 doi: 10.1017/S0954102006000629 Ryan, K.G., Ralph, P., and McMinn, A. 2004. Acclimation of Antarctic bottom-ice algal communities to lowered salinities during melting. Polar Biol. 27: 679-686. McMinn, A. Ryan, K. Gademann, R. 2003 Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation flurometry. Marine biology 143: 359-367 Trenerry, L.J. 2003. Microsensor studies of sea ice algal primary production. MSc thesis, Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Australia. Ryan, K.G. McMinn, A. Mitchell, K.A. Trenerry, L. 2002. Mycosporine-like amino acids in Antarctic sea ice algae, and their response to UVB radiation. Zeitschrift fur Naturforschung 57(c): 471-477. Trenerry, L.J. McMinn, A. Ryan, K.G. 2002. In situ oxygen microelectrode measurements of bottom ice algal production in McMurdo Sound, Antarctica. Polar biology 25: 72-80. Trenerry, L.J. McMinn, A. Ryan, K.G. 2002. In situ oxygen microelectrode measurements of bottom ice algal production in McMurdo Sound, Antarctica. in: Ecological studies in the Antarctic sea ice zone: results of EASIZ midterm symposium.Arntz W. Clarke A.(eds) Berlin, New York: Springer-Verlag. pp.185-193
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19991025
Ending_Date: 19991115
Currentness_Reference:Unknown
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20011011
Ending_Date: 20011109
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 166.3833
East_Bounding_Coordinate: 166.3833
North_Bounding_Coordinate: -77.6833
South_Bounding_Coordinate: -77.6833
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 166.75
East_Bounding_Coordinate: 166.75
North_Bounding_Coordinate: -77.85
South_Bounding_Coordinate: -77.85
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > MARINE HABITAT
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > BIODIVERSITY FUNCTIONS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
Theme_Keyword: LABORATORY
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: LGP > LATITUDINAL GRADIENT PROJECT
Theme_Keyword: EBA > EVOLUTION AND BIODIVERSITY IN THE ANTARCTIC
Theme_Keyword: BIOTA
Theme_Keyword: OCEANS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: CONTINENT > ANTARCTICA > ROSS ISLAND
Place_Keyword: CONTINENT > ANTARCTICA > CAPE EVANS
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: KEN RYAN
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Victoria University of Wellington
Address: School of Biological Sciences
Address: PO BOX 600
City: Wellington
Postal_Code: 6140
Country: New Zealand
Contact_Voice_Telephone: +64 4 463 6083
Contact_Facsimile_Telephone: +64 4 463 5331
Contact_Electronic_Mail_Address: ken.ryan@vuw.ac.nz
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Existing samples are held at Victoria University of Wellington with a spreadsheet of sample numbers. All raw data is held by the investigators. Please contact Dr Ken Ryan for more information.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NZ/NZAI/ANZ > Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand
Contact_Person: SHULAMIT GORDON
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Antarctica New Zealand
Address: Private Bag 4745
City: Christchurch
Country: New Zealand
Contact_Voice_Telephone: +64 3 358 0200
Contact_Facsimile_Telephone: +64 3 358 0211
Contact_Electronic_Mail_Address: s.gordon@antarcticanz.govt.nz
Resource_Description: K136_1999_2002_NZ_1
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.antarcticanz.govt.nz/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
www.lgp.aq/
Access_Instructions:
LGP Project Homepage
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.victoria.ac.nz/sbs/staff/staff_research...
Access_Instructions:
Investigators research page
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20050922
Metadata_Review_Date: 20090316
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: SHULAMIT GORDON
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Antarctica New Zealand
Address: Private Bag 4745
City: Christchurch
Country: New Zealand
Contact_Voice_Telephone: +64 3 358 0200
Contact_Facsimile_Telephone: +64 3 358 0211
Contact_Electronic_Mail_Address: s.gordon@antarcticanz.govt.nz
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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