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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of macroalgae and macroalgal communities in gradients of physical conditions in Potter Cove, King George Island, Antarctica (1996)
    Springer
    Hydrobiologia 333 (1996), S. 1-17 
    Details
    ISSN: 1573-5117
    Keywords: macroalgae ; distribution ; sublittoral ; exposition ; communities ; Antarctic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The vegetation of a small fjord and its adjacent open shore was documented by subaquatic video. The distribution of individual species of macroalgae and the composition of assemblages were compared with gradients of light availability, hydrography, slope inclination, substratum, and exposition to turbulence and ice. The sublittoral fringe is usually abraded by winterly ice floes and devoid of large, perennial algae. Below this zone, the upper sublittoral is dominated by Desmarestia menziesii on steep rock faces, where water movements become irregular, or by Ascoseira mirabilis and Palmaria decipiens on weakly inclined slopes with steady rolling water movements. In the central sublittoral above 15 m, where turbulence is still active, Desmarestia anceps is outcompeting all other species on solid substratum, However, the species is not able to persist on loose material under these conditions. Instead, Himantothallus grandifolius may occur. Deeper, where turbulence usually is negligible, Desmarestia anceps also covers loose material. The change of dominance to Himantothallus grandifolius in the deep sublittoral cannot completely be explained at present. Himantothallus grandifolius also prevails in a mixed assemblage under the influence of grounding icebergs. Most of the smaller algae are opportunists with different degrees of tolerance for turbulence, but some apparently need more stable microhabitats and thus are dependent from continuing suppression of competitive large phaeophytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020959
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  • 2
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    Oxidative balance in macroalgae from Antarctic waters. Possible role of Fe (2017)
    Elsevier
    In:  EPIC3Journal of Experimental Marine Biology and Ecology, Elsevier, 486, pp. 379-386
    Details
    Publication Date: 2016-11-22
    Description: The hypothesis of this work was that exposure to diverse abiotic factors in two sites with different sediment and iron input (Peñón de Pesca: low impact; Island D: high impact, both areas in Potter Cove, King George Island, Antarctica) affects the physiological and oxidative profile of Gigartina skottsbergii and Himantothallus grandifolius. Daily metabolic carbon balance was significantly lower in both macroalgae from Island D compared to Peñón de Pesca. Lipid radical (LRradical dot) content was significantly higher in G. skottsbergii collected from Island D compared to Peñón de Pesca. In contrast, H. grandifolius showed significantly lower values in Island D compared to Peñón de Pesca. The β-carotene (β-C) content was significantly lower in G. skottsbergii from Island D compared to Peñón de Pesca, and the ratio LRradical dot/β-C showed a 6-fold increase in Island D samples compared to Peñón de Pesca. On the other hand, β-C content in H. grandifolius showed no significant differences between both areas. The LRradical dot/β-C content ratio in this alga was significantly lower (26%) in Island D as compared to Peñón de Pesca. Total iron content was significantly higher in both macroalgae from Island D compared to samples from Peñón de Pesca. Results with G. skottsbergii suggested changes in the oxidative cellular balance, probably related to the higher environmental iron in Island D as compared to Peñón de Pesca. The species H. grandifolius seems to be better adapted to the environmental conditions especially through a higher antioxidant capacity to cope with oxidative stress.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Understanding the link between sea ice, ice scour and Antarctic benthic biodiversity; the need for cross station and nation collaboration (2017)
    CAMBRIDGE UNIV PRESS
    In:  EPIC3Polar Record, CAMBRIDGE UNIV PRESS, ISSN: 0032-2474
    Details
    Publication Date: 2017-03-09
    Description: The West Antarctic Peninsula (WAP) is a hotspot of recent, rapid, regional climate change. This has resulted in 0.4°C rise of sea temperature in the last 50 years, five days of sea-ice lost per decade and increased ice-scouring in the shallows. The WAP shallows are ideal for studying biological response to physical change because most known Antarctic species are benthic, physical change occurs mainly in the shallows, and most research stations are coastal. Studies at Rothera Station have found increased benthic disturbance with losses of winter sea ice, and assemblage level changes coincident with this ice-scouring. Such studies are difficult to scale-up as they depend on SCUBA diving - a very spatially limited technique. Here we report attempts to broaden the understanding of benthic ecosystem responses to physical change by replicating the Rothera experimental grids at Carlini station through collaboration between UK, Argentina and Germany across Signy, Rothera and Carlini stations. We argue that such collaborations are the way forward towards understanding the big picture of biota responses to physical climate changes at a regional scale.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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  • 4
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    Antarctic polar seaweeds - 10 years of studies at the Dallmann Laboratory, Potter Cove, King George Island, Antarctica (2001)
    In:  EPIC315th Scientific Conference of the Phycology Section of the German Botanical Society, Stralsund, Germany, 2014-02-23-2014-02-26
    Details
    Publication Date: 2016-02-05
    Description: The Western Antarctic Peninsula is one of the regions most affected by stratospheric ozone depletion and global climate warming, resulting in an increased UVB radiation and a fast glacier retreat. During the last 10 years intensive studies on the seaweed communities and the physiology of single species were conducted at Potter Cove. It was found that UVB radiation can decrease the diversity of the seaweed community by direct and indirect effects (exerting negative effects on the grazers). A higher sediment inflow into the water column due to the melting glaciers is decreasing the light availability for photosynthesis, changing the lower depth distribution of the seaweeds. Additional laboratory and field experiments on the physiological performance and recruitment success of seaweed spores showed a strong species specific susceptibility to UV and photosynthetically active radiation. Altogether the seaweed community at Potter Cove is strongly shaped by the changes of their abiotic environment.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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  • 5
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    Podria el cambio climatico incrementar la productividad primaria de las macroalgas antarcticas? (2015)
    In:  EPIC3XVI CONGRESO LATINOAMERICANO DE CIENCIAS DEL MAR - COLACMAR, Santa Marta, Colombia, 2015-10-18-2015-10-22
    Details
    Publication Date: 2016-01-27
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 6
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    The impact of a changing environment on young macroalgal stages and communities (2015)
    In:  EPIC326. Interantionale Polartagung, München, Germany, 2015-09-06-2015-09-11
    Details
    Publication Date: 2016-02-05
    Description: The Western Antarctic Peninsula (WAP) is a hotspot for changes caused by humans. The total column ozone is not expected to increase in the next several decades leading to an increased UVB radiation at the earth’s surface and, hence, on polar organisms. Global warming is accelerated at the WAP in comparison with the global mean and in some areas water temperatures have risen by 2°C in the last 50 years. Seaweeds are an essential part of the polar coastal ecosystem showing a high level of endemism. Little is known how these communities react on stressors such as UV radiation, light intensity, increasing temperatures and sedimentation and decreased salinity (from the melt water run-off from the glaciers). A variety of field and laboratory experiments on seaweed communities and young developmental stages (spores) were performed over the last ten years in order to tackle this question. A focus was lying on the interactive effects of various variables such as UV and grazing or temperature, sedimentation and grazing and the effect of light and temperature among others. We also performed long term colonization experiments over 4 years to elucidate the general patterns of polar seaweed succession. Interactive effects occurred for example between grazing and UV radiation in field experiments and between temperature and light intensity in laboratory experiments. Other data are currently analyzed. Our results showed that juvenile stages are especially vulnerable to environmental perturbations and that the degree of susceptibility is species-specific. Shift in community structure as a response to environmental change are likely to occur with yet unknown consequences for the associated heterotrophic organisms.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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  • 7
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    Daily Metabolic Carbon Balance in Spring and Summer and Vertical Distribution of Two Macroalgal Key Species In Potter Cove, South Shetland Islands, Antarctica (2012)
    In:  EPIC3II Workshop APECS, Universidad de Rio Grande (FURG), Brasil, 2012-05-14-2012-05-17
    Details
    Publication Date: 2019-07-17
    Description: The aim of this study is to understand the macroalgal vertical zonation at Potter Cove (Isla 25 de Mayo/ King George Island) in three selected newly ice-free areas with different degree of glacial influence (low: area 1, intermediate: area 2, and high: area 3), and thus a different degree of sedimentation, from a physiological point of view. In summer 2010 and spring 2011, two macroalgal key species (Himantothallus grandifolius and Palmaria decipiens) were sampled at 5, 10, 20 and 30 m depth. After collection, photosynthesis – irradiance curves were performed and photosynthetic parameters were calculated. Photosynthetically Active Radiation (PAR) was logged continuously over 7 days during spring 2011 and summer 2012 at 0, 5, 10, 20 and 30 meters depth in each area. Subsequently, the daily metabolic carbon balance (DMCB) was determined using the obtained photosynthetic parameters and the underwater PAR data. In areas with high glacial influence the maximal vertical distribution limit of all species was 10 m depth, while in areas with intermediate and low glacial impact, it was 20 and 30 m depth, respectively. PAR values were higher in spring than in summer. For both species, DMCB values were significantly higher in spring compared to summer. In addition, both species DMCB values decreased significantly with increasing depth, and were significantly higher in areas 1 and 2 (low and intermediate glacial influence) compared to area 3 (high glacial influence). The observed vertical distribution in all the studied areas seem to be determined mainly by the spring PAR conditions, as in summer the DMCB values are too low for both species to explain their survival. Furthermore, vertical zonation of the studied species is positively correlated to the light penetration which decreases as the glacial influence (as production of sediment input) increases. A further increase of sedimentation due to global warming will undoubtedly lead to an elevation of the lower distribution limit of the studied species and will probably have a great effect on macroalgal primary productivity in Potter Cove.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
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    How do two key seaweed species respond to glacier retreat in Potter Cove, South Shetland Islands, Antarctica (2012)
    In:  EPIC3XXXII SCAR and Open Science Conference, Portland, OR, USA, 2012-07-16-2012-07-19
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Succesion of benthic marine algae in newly ice-free areas of Potter Cove: a four years study. (2014)
    In:  EPIC3XXXIII SCAR Open Science Conference., Auckland, New Zealand, 2014-08-25-2014-08-28
    Details
    Publication Date: 2014-10-18
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Can glacial melting cause interannual variations in the productivity of Antarctic seaweeds (Potter Cove, Antarctica)? (2013)
    In:  EPIC3XIth SCAR Biology Symposium, Barcelona, Spain, 2013-07-15-2013-07-19
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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