Publication Type Journal Article
Title Structural shifts in sea ice prokaryotic communities across a salinity gradient in the subarctic
Authors Ligia Patricia Fonseca Coelho Joana Fernandes Couceiro Tina Keller-Costa Sara Martinez Valente Tiago Pereirinha Ramalho Joana Carneiro Jerome Comte Marie-Amelie Blais Warwick F. Vincent Zita Martins João Canário Rodrigo Costa
Groups Chem4Env
Journal SCIENCE OF THE TOTAL ENVIRONMENT
Year 2022
Month
Notice: Undefined index: in /afs/ist.utl.pt/groups/cqe/web/tmp/templates_c/77f86a5f762542dadf50c7f7fefa96acd45c2726_0.file.paper.tpl.html.php on line 163
Volume 827
Number
Pages
Abstract Current knowledge of the processes that shape prokaryotic community assembly in sea ice across polar ecosystems is scarce. Here, we coupled culture-dependent (bacterial isolation on R2A medium) and culture-independent (high throughput 16S rRNA gene sequencing) approaches to provide the first comprehensive assessment of prokaryotic communities in the late winter ice and its underlying water along a natural salinity gradient in coastal Hudson Bay, an iconic cryo-environment that marks the ecological transition between Canadian Subarctic and Arctic biomes. We found that prokaryotic community assembly processes in the ice were less selective at low salinity since typical freshwater taxa such as Frankiales, Burkholderiales, and Chitinophagales dominated both the ice and its underlying water. In contrast, there were sharp shifts in community structure between the ice and underlying water samples at sites with higher salinity, with the orders Alteromonadales and Flavobacteriales dominating the ice, while the abovementioned freshwater taxa dominated the underlying water communities. Moreover, primary producers including Cyanobium (Cyanobacteria, Synechococcales) may play a role in shaping the ice communities and were accompanied by known Planctomycetes and Verrucomicrobiae taxa. Culture-dependent analyses showed that the ice contained pigment producing psychrotolerant or psychrophilic bacteria from the phyla Proteobacteria, Actinobacteriota, and Bacteroidota, likely favored by the combination of low temperatures and the seasonal increase in sunlight. Our findings suggest that salinity, photosynthesis and dissolved organic matter are the main drivers of prokaryotic community structure in the late winter ice of coastal Hudson Bay, the ecosystem with the fastest sea ice loss rate in the Canadian North.
DOI http://dx.doi.org/10.1016/j.scitotenv.2022.154286
ISBN
Publisher ELSEVIER
Book Title
ISSN 0048-9697
EISSN 1879-1026
Conference Name
Bibtex ID WOS:000783593700004
Observations
Back to Publications List