Patterns and Drivers of Extracellular Enzyme Activity in New Zealand Glacier-Fed Streams.
alpine biogeochemistry
ecological stoichiometry
extracellular enzyme activities
microbial ecology
nutrient cycling and limitation
Journal
Frontiers in microbiology
ISSN: 1664-302X
Titre abrégé: Front Microbiol
Pays: Switzerland
ID NLM: 101548977
Informations de publication
Date de publication:
2020
2020
Historique:
received:
04
08
2020
accepted:
27
10
2020
entrez:
17
12
2020
pubmed:
18
12
2020
medline:
18
12
2020
Statut:
epublish
Résumé
Glacier-fed streams (GFSs) exhibit near-freezing temperatures, variable flows, and often high turbidities. Currently, the rapid shrinkage of mountain glaciers is altering the delivery of meltwater, solutes, and particulate matter to GFSs, with unknown consequences for their ecology. Benthic biofilms dominate microbial life in GFSs, and play a major role in their biogeochemical cycling. Mineralization is likely an important process for microbes to meet elemental budgets in these systems due to commonly oligotrophic conditions, and extracellular enzymes retained within the biofilm enable the degradation of organic matter and acquisition of carbon (C), nitrogen (N), and phosphorus (P). The measurement and comparison of these extracellular enzyme activities (EEA) can in turn provide insight into microbial elemental acquisition effort relative to environmental availability. To better understand how benthic biofilm communities meet resource demands, and how this might shift as glaciers vanish under climate change, we investigated biofilm EEA in 20 GFSs varying in glacier influence from New Zealand's Southern Alps. Using turbidity and distance to the glacier snout normalized for glacier size as proxies for glacier influence, we found that bacterial abundance (BA), chlorophyll
Identifiants
pubmed: 33329472
doi: 10.3389/fmicb.2020.591465
pmc: PMC7711088
doi:
Types de publication
Journal Article
Langues
eng
Pagination
591465Informations de copyright
Copyright © 2020 Kohler, Peter, Fodelianakis, Pramateftaki, Styllas, Tolosano, de Staercke, Schön, Busi, Wilmes, Washburne and Battin.
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