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<p>Algal blooms play important roles in physical and biological processes on glacial surfaces. Despite this, their occurrence and impacts within an Antarctic context remain understudied. Here, we present evidence of the large-scale presence, diversity and bioalbedo effects of algal blooms on Antarctic ice cap systems based on fieldwork conducted on Robert Island (South Shetland Islands, Antarctica). Algal blooms are observed covering up to 2.7 km<sup>2</sup> (~20%) of the measured area of the Robert Island ice cap, with cell densities of up to 1.4 × 10<sup>6</sup> cells ml<sup>−1</sup>. Spectral characterisation reveal that these blooms increase melting of the ice cap surface, contributing up to 2.4% of total melt under the observed conditions. Blooms are composed of typical cryoflora taxa, dominated by co-occurring Chlorophyceae, Trebouxiophyceae, and <i>Ancylonema</i>. However, morphological variation and genetic diversity in <i>Ancylonema</i> highlight the influence of regional endemism and point to a large and under-characterised diversity in Antarctic cryoflora.</p>

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Surface darkening by abundant and diverse algae on an Antarctic ice cap

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月18日

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  • Alex Innes Thomson,
  • Andrew Gray,
  • Claudia Colesie,
  • Naomi Thomas,
  • Hannah Moulton,
  • Peter Convey,
  • Alison G. Smith,
  • Peter Fretwell,
  • Lloyd Peck,
  • Matthew P. Davey

摘要

Algal blooms play important roles in physical and biological processes on glacial surfaces. Despite this, their occurrence and impacts within an Antarctic context remain understudied. Here, we present evidence of the large-scale presence, diversity and bioalbedo effects of algal blooms on Antarctic ice cap systems based on fieldwork conducted on Robert Island (South Shetland Islands, Antarctica). Algal blooms are observed covering up to 2.7 km2 (~20%) of the measured area of the Robert Island ice cap, with cell densities of up to 1.4 × 106 cells ml−1. Spectral characterisation reveal that these blooms increase melting of the ice cap surface, contributing up to 2.4% of total melt under the observed conditions. Blooms are composed of typical cryoflora taxa, dominated by co-occurring Chlorophyceae, Trebouxiophyceae, and Ancylonema. However, morphological variation and genetic diversity in Ancylonema highlight the influence of regional endemism and point to a large and under-characterised diversity in Antarctic cryoflora.