Becker, Susanne; Graeve, Martin; Bischof, Kai (2010): Photosynthetically active radiation during the experiment, and lipid content of sub- and intertidal specimens of the endemic Antarctic red alga, Palmaria decipiens [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.846919, Supplement to: Becker, S et al. (2010): Photosynthesis and lipid composition of the Antarctic endemic rhodophyte Palmaria decipiens: effects of changing light and temperature levels. Polar Biology, 33(7), 945-955, https://doi.org/10.1007/s00300-010-0772-5
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Abstract:
In coastal waters, Antarctic rhodophytes are exposed to harsh environmental conditions throughout the year, like low water temperatures ranging from -1.8°C to 2°C and high light during the summer season. Photosynthetic performance under these conditions may be affected by slowed down enzymatic reactions and the increased generation of reactive oxygen species. The consequence might be a chronic photoinhibition of photosynthetic primary reactions related to increased fragmentation of the D1 reaction centre protein in photosystem II. It is hypothesized that changes in lipid composition of biomembranes may represent an adaptive trait to maintain D1 turnover in response to temperature variation. The interactive effects of high light and low temperature were studied on an endemic Antarctic red alga, Palmaria decipiens, sampled from two shore levels, intertidal and subtidal, and exposed to mesocosm experiments using two levels of natural solar radiation and two different temperature regimes (2-5°C and 5-10°C). During the experimental period of 23 days, maximum quantum yield of photosynthesis decreased in all treatments, with the intertidal specimens exposed at 5-10°C being most affected. On the pigment level, a decreasing ratio of phycobiliproteins to chlorophyll a was found in all treatments. A pronounced decrease in D1 protein concentration occurred in subtidal specimens exposed at 2-5°C. Marked changes in lipid composition, i.e. the ratio of saturated to unsaturated fatty acids, indicated an effective response of specimens to temperature change. Results provide new insights into mechanisms of stress adaptation in this key species of shallow Antarctic benthic communities.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -62.237220 * Longitude: -58.666390
Date/Time Start: 2008-01-26T00:00:00 * Date/Time End: 2008-02-17T00:00:00
Event(s):
Carlini_Base_C2 (Jubany_Station_C2) * Latitude: -62.237220 * Longitude: -58.666390 * Elevation: 20.0 m * Location: Potter Cove, King George Island, Antarctic Peninsula * Campaign: Jubany * Basis: Carlini/Jubany Station * Method/Device: Research station (RS) * Comment: Formerly know as Jubany Base, on 2012-03-05 renamed to Scientific Base Dr. Alejandro Carlini
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Becker, S; Graeve, M; Bischof, K (2010): (Table 1) Photosynthetically active radiation measurements in air throughout the duration of the mesocosm experiment. https://doi.org/10.1594/PANGAEA.846918
- Becker, S; Graeve, M; Bischof, K (2010): (Table 2) Fatty acid content of subtidal specimens of Palmaria decipiens exposed to different temperatures at ambient light conditions prevailing at Potter Cove, January and February 2008. https://doi.org/10.1594/PANGAEA.846916
- Becker, S; Graeve, M; Bischof, K (2010): (Table 3) Fatty acid content of intertidal specimens of Palmaria decipiens exposed to different temperatures at ambient light conditions prevailing at Potter Cove, January and February 2008. https://doi.org/10.1594/PANGAEA.846917