FTIR autecological analysis of bottom-ice diatom taxa across a tidal strait in the Canadian Arctic
Permanent lenke
https://hdl.handle.net/10037/28181Dato
2022-12-23Type
Journal articleTidsskriftartikkel
Peer reviewed
Forfatter
Pogorzelec, Nicole M.; Gough, Kathleen M.; Ha, Sun-Yong; Campbell, Karley; Else, Brent; Kim, Kwanwoo; Lee, Sang Heon; Mundy, C.J.Sammendrag
A recent study demonstrated that an Arctic tidal strait, where a shoaled and constricted waterway increases
tidally driven sub-ice currents and turbulence, represents a “hotspot” for ice algal production due to
a hypothesized enhanced ocean-ice nutrient supply. Based on these findings, we sampled the bottom-ice
algal community across the same tidal strait between the Finlayson Islands within Dease Strait, Nunavut,
Canada, in spring 2017. Our objective was to examine cellular responses of sea-ice diatoms to two expected
nutrient supply gradients in their natural environment: (1) a horizontal gradient across the tidal strait and (2)
a vertical gradient in the bottom-ice matrix. Two diatom taxa, Nitzschia frigida and Attheya spp. in bottomice sections (0–2, 2–5, and 5–10 cm) under thin snow cover (<5 cm), were selected for Fourier Transform
Infrared (FTIR) spectrochemical analysis for lipid and protein content. Results from the FTIR technique
strongly supported the existence of a horizontal nutrient gradient across the tidal strait of the Finlayson
Islands, while estimates of particulate organic carbon and chlorophyll a concentrations were difficult to
interpret. The larger N. frigida cells appeared to be more sensitive to the suspected horizontal nutrient
gradient, significantly increasing in lipid content relative to protein beyond the tidal strait. In contrast,
the epiphytic diatoms, Attheya spp., were more sensitive to the vertical gradient: above 2 cm in the
bottom-ice matrix, the non-motile cells appeared to be trapped with a depleted nutrient inventory and
evidence of a post-bloom state. Application of the FTIR technique to estimate biomolecular composition of
algal cells provided new insights on the response of the bottom-ice algal community to the examined spatial
gradients that could not be obtained from conventional bulk measurements alone. Future studies of sea ice
and associated environments are thus encouraged to employ this technique.
Forlag
University of California PressSitering
Pogorzelec, Gough, Ha, Campbell KL, Else B, Kim, Lee, Mundy C. FTIR autecological analysis of bottom-ice diatom taxa across a tidal strait in the Canadian Arctic . Elementa: Science of the Anthropocene. 2022;10(1)Metadata
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