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Investigations of the physiological adaptations (irradiance and temperature tolerance limits) of two polar species of red algae Iridaea cordata and Phyllophora antarctica at Cape Evans

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Investigations of the physiological adaptations (irradiance and temperature tolerance limits) of two polar species of red algae Iridaea cordata and Phyllophora antarctica at Cape Evans
Description:
Abstract:
The most southerly populations of benthic marine algae occurring anywhere in the world are found in McMurdo Sound. There is considerable divergence of opinion amongst phycologists as to the suitability of polar seas for the growth of autotrophic seaweeds. Some consider the exceptional clarity of the open ocean waters to be ideal for good deep growth whereas others postulate the need for partially heterotrophic nutrition to account for growth under very poor photic conditions. In order to determine the physiological adaptations of these plants, it is also important to know their overall tolerances of extremes of illumination and increased water temperature. To determine whether the two dominant red seaweeds, Iridaea cordata and Phyllophora antarctica, found at Cape Evans show any physiological adaptation to the prevailing environmental conditions, a series of experiments was undertaken to quantify rates of photosynthesis and respiration under a range of irradiances and at water temperatures between -1°C and 25°C. All measurements of photosynthesis and dark respiration were made using the Winkler chemical method to determine changes in dissolved oxygen caused by the metabolic activities of pieces of algal tissue inside sealed glass bottles. The incubation apparatus was designed so that temperatures down to -2°C could be attained. The specific experiments were as follows. 1) To assess the metabolic response of P. antarctica and I. cordata at a range of irradiance levels and ambient sea temperature, bottles containing homogenous portions of plant tissue were incubated for 1 hour under a range of irradiance levels. At the end of incubation, changes in dissolved oxygen were measured and converted to rates of photosynthesis and respiration. 2) To assess the metabolic response of P. antarctica and I. cordata to elevated temperatures plants were exposed for 1 hour to temperatures ranging between -1°C and 25°C. Respiration rates were measured. The effect of longer exposure to elevated temperatures was also investigated. 3) To assess the chlorophyll content of Antarctic seaweeds, the chlorophyll a content was determined. 4) To assess the growth in situ of P. antarctica and I. chordata individual plants were attached to a rope at different depths and changes in weight monitored over a four week period. In addition, material was brought back to New Zealand for chemical analysis for chlorophyll, total carbon, nitrogen and phosphorus content, inorganic ion composition and cell wall polysaccharides. An ecological survey using a non-destructive harvesting technique was also carried out. Information was obtained on the distribution of then benthic communities and the relative quantities of the 2 dominant species present at Cape Evans.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Miller, K.A. Pearse, J.S. 1991 Ecological studies of seaweeds in McMurdo Sound, Antarctica. American zoologist 31(1): 35-48
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19891023
Ending_Date: 19891126
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 166.4
East_Bounding_Coordinate: 166.4
North_Bounding_Coordinate: -77.6333
South_Bounding_Coordinate: -77.6333
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > COASTAL HABITAT
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > MACROALGAE (SEAWEEDS) > RED ALGAE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > EVOLUTIONARY ADAPTATION
Theme_Keyword: FIELD SURVEYS
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: BIOTA
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > ANTARCTICA
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: MURRAY BROWN
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: School of Biological Sciences
Address: University of Plymouth
Address: Drake Circus
City: Plymouth
Postal_Code: PL4 8AA
Country: UK
Contact_Voice_Telephone: +44 (0) 1752 584 614
Contact_Facsimile_Telephone: +44 (0) 1752 232 970
Contact_Electronic_Mail_Address: M.T.Brown@plymouth.ac.nz
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
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: K062_1989_1990_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:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20090521
Metadata_Review_Date: 20090606
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: CEISHA POIROT
Contact_Person_Primary:
Contact_Person: SHULAMIT GORDON
Contact_Position: DIF AUTHOR
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_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_Voice_Telephone: +64 3 358 0200
Contact_Facsimile_Telephone: +64 3 358 0211
Contact_Facsimile_Telephone: +64 3 358 0211
Contact_Electronic_Mail_Address: c.poirot@antarcticanz.govt.nz
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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