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Title: Cryoconite – From minerals and organic matter to bioengineered sediments on glacier's surfaces
Authors: Rozwalak, Piotr
Podkowa, Paweł
Buda, Jakub
Niedzielski, Przemysław
Kawecki, Szymon
Ambrosini, Roberto
Azzoni, Roberto S.
Baccolo, Giovanni
Ceballos, Jorge L.
Cook, Joseph
Di Mauro, Biagio
Ficetola, Gentile Francesco
Franzetti, Andrea
Ignatiuk, Dariusz
Klimaszyk, Piotr
Łokas, Edyta
Ono, Masato
Parnikoza, Ivan
Pietryka, Mirosława
Pittino, Francesca
Poniecka, Ewa
Porazinska, Dorota L.
Richter, Dorota
Schmidt, Steven K.
Sommers, Pacifica
Souza-Kasprzyk, Juliana
Stibal, Marek
Szczuciński, Witold
Uetake, Jun
Wejnerowski, Łukasz
Yde, Jacob C.
Takeuchi, Nozomu
Zawierucha, Krzysztof
Keywords: Biogenic aggregates
Biotic consortia
Cryoconite holes
Ecosystem engineers
Supraglacial ecosystems
Issue Date: 2022
Publisher: Elsevier
Citation: Science of the Total Environment, 807: 150874
Abstract: Cryoconite is a mixture of mineral and organic material covering glacial ice, playing important roles in biogeochemical cycles and lowering the albedo of a glacier surface. Understanding the differences in structure of cryoconite across the globe can be important in recognizing past and future changes in supraglacial environments and ice-organisms-minerals interactions. Despite the worldwide distribution and over a century of studies, the basic characteristics of cryoconite, including its forms and geochemistry, remain poorly studied. The major purpose of our study is the presentation and description of morphological diversity, chemical and photoautotrophs composition, and organic matter content of cryoconite sampled from 33 polar and mountain glaciers around the globe. Observations revealed that cryoconite is represented by various morphologies including loose and granular forms. Granular cryoconite includes smooth, rounded, or irregularly shaped forms; with some having their surfaces covered by cyanobacteria filaments. The occurrence of granules increased with the organic matter content in cryoconite. Moreover, a major driver of cryoconite colouring was the concentration of organic matter and its interplay with minerals. The structure of cyanobacteria and algae communities in cryoconite differs between glaciers, but representatives of cyanobacteria families Pseudanabaenaceae and Phormidiaceae, and algae familiesMesotaeniaceae and Ulotrichaceae were the most common. The most of detected cyanobacterial taxa are known to produce polymeric substances (EPS) that may cement granules. Organic matter content in cryoconite varied between glaciers, ranging from 1% to 38%. The geochemistry of all the investigated samples reflected local sediment sources, except of highly concentrated Pb and Hg in cryoconite collected from Europeanglaciers near indus-rialized regions, corroborating cryoconite as element-specific collector and potential environmental indicator of anthropogenic activity. Our work supports a notion that cryoconite may be more than just simple sediment and instead exhibits complex structure with relevance for biodiversity and the functioning of glacial ecosystems.
DOI: 10.1016/j.scitotenv.2021.150874
Appears in Collections:Artykuły naukowe (WNGiG)

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