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Insights Into Cryoconite Community Dynamics on the Alpine Glacier Throughout the Ablation Season.

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Title: Insights Into Cryoconite Community Dynamics on the Alpine Glacier Throughout the Ablation Season.
Authors: Jaroměřská, Tereza Novotná1 (AUTHOR), Ambrosini, Roberto2 (AUTHOR), Richter, Dorota3 (AUTHOR), Pietryka, Miroslawa3 (AUTHOR), Niedzielski, Przemyslaw4 (AUTHOR), Souza‐Kasprzyk, Juliana4 (AUTHOR), Klimaszyk, Piotr5 (AUTHOR), Franzetti, Andrea6 (AUTHOR), Pittino, Francesca6 (AUTHOR), Vondrovicová, Lenka7 (AUTHOR), Senese, Antonella2 (AUTHOR), Zawierucha, Krzysztof8 (AUTHOR) k.p.zawierucha@gmail.com
Source: Ecology & Evolution (20457758). Mar2025, Vol. 15 Issue 3, p1-12. 12p.
Subject Terms: *Ablation (Glaciology), *Green algae, *Biotic communities, Algal communities, Stable isotopes
Abstract: Cryoconite holes (water reservoirs) significantly contribute to biodiversity and biogeochemical processes on glacier surfaces. However, the lack of seasonal observations of cryoconite biota limits our knowledge of glacial ecosystem functioning. We studied photoautotrophs, consumers and sediment characteristics (community structure, biomass, elemental composition, organic matter content, δ13C, δ15N) from cryoconite holes in the upper and lower parts of the Forni Glacier ablation zone (Italy) throughout the ablation season. Dominant cyanobacteria were Oscillatoriaceae and Leptolyngbyaceae, while dominant green algae were Zygnemataceae and Chlorellaceae. Tardigrades (Cryobiotus klebelsbergi) were the dominant consumers. The biomass of consumers negatively correlated with the biomass of green algae, indicating that grazing likely controls algal communities in the upper part. Green algae dominated the upper part, while a shift from green algae‐ to cyanobacteria‐dominated communities was observed in the lower part during the season. The increase in δ13C of cryoconite organic matter (OM) in the lower part followed the trend of the community shift of photoautotrophs potentially affected by precipitation. Also, δ13C of tardigrades positively correlated with δ13C of cryoconite OM in the upper part, indicating some cryoconite OM as their food. Some photoautotrophic taxa appeared only on specific dates, and no spatio‐temporal changes in the cryoconite general elemental composition were found. Our data indicate that changes in the community structure and biomass of cryoconite biota on the Forni Glacier likely depend on the interplay between phenology, stochastic events (e.g., rainfall) and top‐down or bottom‐up controls. We demonstrate that multiple observations are essential for understanding the ecology of biota inhabiting cryoconite holes throughout the ablation season. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Insights Into Cryoconite Community Dynamics on the Alpine Glacier Throughout the Ablation Season.
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  Data: <searchLink fieldCode="AR" term="%22Jaroměřská%2C+Tereza+Novotná%22">Jaroměřská, Tereza Novotná</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ambrosini%2C+Roberto%22">Ambrosini, Roberto</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Richter%2C+Dorota%22">Richter, Dorota</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pietryka%2C+Miroslawa%22">Pietryka, Miroslawa</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Niedzielski%2C+Przemyslaw%22">Niedzielski, Przemyslaw</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Souza‐Kasprzyk%2C+Juliana%22">Souza‐Kasprzyk, Juliana</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Klimaszyk%2C+Piotr%22">Klimaszyk, Piotr</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Franzetti%2C+Andrea%22">Franzetti, Andrea</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pittino%2C+Francesca%22">Pittino, Francesca</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vondrovicová%2C+Lenka%22">Vondrovicová, Lenka</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Senese%2C+Antonella%22">Senese, Antonella</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zawierucha%2C+Krzysztof%22">Zawierucha, Krzysztof</searchLink><relatesTo>8</relatesTo> (AUTHOR)<i> k.p.zawierucha@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Mar2025, Vol. 15 Issue 3, p1-12. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Ablation+%28Glaciology%29%22">Ablation (Glaciology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Green+algae%22">Green algae</searchLink><br />*<searchLink fieldCode="DE" term="%22Biotic+communities%22">Biotic communities</searchLink><br /><searchLink fieldCode="DE" term="%22Algal+communities%22">Algal communities</searchLink><br /><searchLink fieldCode="DE" term="%22Stable+isotopes%22">Stable isotopes</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Cryoconite holes (water reservoirs) significantly contribute to biodiversity and biogeochemical processes on glacier surfaces. However, the lack of seasonal observations of cryoconite biota limits our knowledge of glacial ecosystem functioning. We studied photoautotrophs, consumers and sediment characteristics (community structure, biomass, elemental composition, organic matter content, δ13C, δ15N) from cryoconite holes in the upper and lower parts of the Forni Glacier ablation zone (Italy) throughout the ablation season. Dominant cyanobacteria were Oscillatoriaceae and Leptolyngbyaceae, while dominant green algae were Zygnemataceae and Chlorellaceae. Tardigrades (Cryobiotus klebelsbergi) were the dominant consumers. The biomass of consumers negatively correlated with the biomass of green algae, indicating that grazing likely controls algal communities in the upper part. Green algae dominated the upper part, while a shift from green algae‐ to cyanobacteria‐dominated communities was observed in the lower part during the season. The increase in δ13C of cryoconite organic matter (OM) in the lower part followed the trend of the community shift of photoautotrophs potentially affected by precipitation. Also, δ13C of tardigrades positively correlated with δ13C of cryoconite OM in the upper part, indicating some cryoconite OM as their food. Some photoautotrophic taxa appeared only on specific dates, and no spatio‐temporal changes in the cryoconite general elemental composition were found. Our data indicate that changes in the community structure and biomass of cryoconite biota on the Forni Glacier likely depend on the interplay between phenology, stochastic events (e.g., rainfall) and top‐down or bottom‐up controls. We demonstrate that multiple observations are essential for understanding the ecology of biota inhabiting cryoconite holes throughout the ablation season. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/ece3.71064
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        Text: English
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      – SubjectFull: Ablation (Glaciology)
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      – SubjectFull: Green algae
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      – SubjectFull: Biotic communities
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              Text: Mar2025
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