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Due to global change affecting glaciers worldwide, glacial streams are seen as threatened environments deserving specific scientific interest. Glacial streams from the Coast Range and Rocky Mountains in British Columbia and at the border to Alberta were investigated. In particular glacial streams and downstream sites in the Joffré Lakes Provincial Park, a near by mountain river and two large glacial streams in the Rocky Mountains (Kootenay Range, Jasper National Park) were studied. Regardless of a high variability of catchment glaciation (1 to 99%) thin organic biofilms with firmly attached diatom frustules of the genera Achnanthidium, Psammothidium, Encyonema, Gomphonema and fragilaroid taxa were found in all cases. In spite of fundamentally different geological conditions between the Coast Range sites and the Rocky Mountain sites, the pioneer taxon Achnanthidium minutissimum (with a slimy long ecomorph) was dominating quantitatively in most of the glacier stream samples together with the rheobiontic Hannaea arcus. Individual glacier stream samples were characterized by the dominance of Achnanthidium petersenii and Gomphonema calcifugum/Encyonema latens. The diatom community analysis (cluster analysis) revealed the expected separation of glacier stream sites and sites of the lower segments of the river continuum (e.g., dominance of Diatoma ehrenbergii in the mountain river). In the Joffré area, the total species richness of turbid glacial streams close to the glacier mouth was significantly lower than in the more distant sites. The two largest glacial streams in the Rocky Mountains showed divergent results with a remarkable high species richness (43 taxa) at the Athabasca River origin (Columbia Icefield) and low diversity in Illecillewaet river (9 km downstream the glacier mouth). From the biogeographical point of view the dominant taxa comprised mainly widespread pioneer species coping best with the unstable conditions, while the subdominant taxa comprised taxa specific for pristine arctic-alpine or high altitude habitats (e.g., Psammothidium grischunum). Almost 50% of the taxa were classified as oligo- to oligo-mesotraphentic and approximately 20% as endangered or extremely rare. Gesierich, Doris, and Eugen Rott. 2012. “Is Diatom Richness Responding to Catchment Glaciation? A Case Study from Canadian Headwater Streams”. Journal of Limnology 71 (1):e7. https://doi.org/10.4081/jlimnol.2012.e7. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : The Multitrophic Effects of Climate Change and Glacier Retreat in Mountain Rivers Lee E. BrownJonathan L. Carrivick, Sarah C. Fell, BioScience : 2017 Stream diatom assemblages in an Arctic catchment: diversity and relationship to ecosystem-scale primary production Breena Riley, David Seekell Arctic Science : 2021 Encyclopedia of Inland Waters J. Brahney, K.C. Weathers, I. Reche Ecosystem shifts in Alpine streams under glacier retreat and rock glacier thaw: A review Stefano Brighenti, Monica Tolotti, Maria Cristina Bruno, Geraldene Wharton, Martin T. Pusch, Walter Bertoldi Science of The Total Environment : 2019 Impact of glacier changes on ecosystem of proglacial lakes in high mountain regions of East Siberia (Russia) S. S. Vorobyeva, V. A. Trunova, O. G. Stepanova, V. V. Zvereva, S. K. Petrovskii, M. S. Melgunov, T. O. Zheleznyakova, L. G. Chechetkina, A. P. Fedotov Environmental Earth Sciences : 2015 When the going gets tough, the tough get going: The enigma of survival strategies in harsh glacial stream environments Georg H. Niedrist, Leopold Füreder Freshwater Biology : 2018 A global synthesis of biodiversity responses to glacier retreat Sophie Cauvy-Fraunié, Olivier Dangles Nature Ecology & Evolution : 2019 Glacier dynamics in the southern part of East Siberia (Russia) from the final part of the LGM to the present based on from biogeochemical proxies from bottom sediments of proglacial lakes O.G. Stepanova, V.A. Trunova, E. Yu Osipov, E.E. Kononov, S.S. Vorobyeva, E.V. Parkhomchuk, P.N. Kalinkin, E.E. Vorobyeva, K.E. Vershinin, S.A. Rastigeev, A.P. Fedotov Quaternary International : 2019 Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation Cantonati, Poikane, Pringle, Stevens, Turak, Heino, Richardson, Bolpagni, Borrini, Cid, Čtvrtlíková, Galassi, Hájek, Hawes, Levkov, Naselli-Flores, Saber, Cicco, Fiasca, Hamilton, Kubečka, Segadelli, Znachor Water : 2020 Stream Ecology J. David Allan, Maria M. Castillo, Krista A. Capps Multi-group biodiversity distributions and drivers of metacommunity organization along a glacial–fluvial–limnic pathway on the Tibetan plateau Qi Lu, Si-Yu Zhang, Jianqing Du, Qiang Liu, Chunxia Dong, Jindong Zhao, Yanfen Wang, Meng Yao Environmental Research : 2023 Glacier recession alters stream water quality characteristics facilitating bloom formation in the benthic diatom Didymosphenia geminata J. Brahney, M.L. Bothwell, L. Capito, C.A. Gray, S.E. Null, B. Menounos, P.J. Curtis Science of The Total Environment : 2021 Rare calciphilous diatoms from the genus Gomphonema (Bacillariophyta) in lotic waters of SE Poland Teresa Noga, Anita Poradowska, Łukasz Peszek, Mateusz Rybak Oceanological and Hydrobiological Studies : 2018 Effects ofDidymosphenia geminatablooms on benthic diatom assemblages in the Restigouche River Watershed, eastern Canada Branaavan Sivarajah, Joshua Kurek, Kathleen M. Rühland, John P. Smol Botany : 2015 Trophic ecology of alpine stream invertebrates: current status and future research needs Georg H. Niedrist, Leopold Füreder Freshwater Science : 2017 Diatoms in cryoconite holes and adjacent proglacial freshwater sediments, Nordenskiöld glacier (Spitsbergen, High Arctic) Petra Vinšová, Eveline Pinseel, Tyler J. Kohler, Bart Van De Vijver, Jakub D. Žárský, Jan Kavan, Kateřina Kopalová Czech Polar Reports : 2015 Glacial stream ecosystems and epilithic algal communities under a warming climate Karson Sudlow, Simonne S. Tremblay, Rolf D. Vinebrooke Environmental Reviews : 2023 Evidence of rock glacier melt impacts on water chemistry and diatoms in high mountain streams Hansjörg Thies, Ulrike Nickus, Monica Tolotti, Richard Tessadri, Karl Krainer Cold Regions Science and Technology : 2013 The ecology of diatoms inhabiting cryoconite holes in Antisana Glacier, Ecuador Susana Chamorro, Jennifer Moyón, Franks Araya, José Salazar, Juan-Carlos Navarro, Eloy Bécares, Saúl Blanco Journal of Glaciology : 2022 Long-term response of diatoms in high-elevation streams influenced by rock glaciers Łukasz Peszek, Barbara Kawecka, Christopher T. Robinson Ecological Indicators : 2022 Declining glacier cover threatens the biodiversity of alpine river diatom assemblages Sarah C. Fell, Jonathan L. Carrivick, Martyn G. Kelly, Leopold Füreder, Lee E. 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