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Biomolecular profiles of Arctic sea-ice diatoms highlight the role of under-ice light in cellular energy allocation.
Duncan, Rebecca J; Nielsen, Daniel; Søreide, Janne E; Varpe, Øystein; Tobin, Mark J; Pitusi, Vanessa; Heraud, Philip; Petrou, Katherina.
Afiliación
  • Duncan RJ; School of Life Sciences, University of Technology Sydney, Sydney, New South Wales, 2007, Australia.
  • Nielsen D; Department of Arctic Biology, The University Centre in Svalbard, Longyearbyen, 9170, Norway.
  • Søreide JE; School of Life Sciences, University of Technology Sydney, Sydney, New South Wales, 2007, Australia.
  • Varpe Ø; Department of Arctic Biology, The University Centre in Svalbard, Longyearbyen, 9170, Norway.
  • Tobin MJ; Department of Biological Sciences, University of Bergen, Bergen, 5020, Norway.
  • Pitusi V; Norwegian Institute for Nature Research, Bergen, 5006, Norway.
  • Heraud P; Australian Synchrotron-ANSTO, Clayton, Victoria, 3168, Australia.
  • Petrou K; Department of Arctic Biology, The University Centre in Svalbard, Longyearbyen, 9170, Norway.
ISME Commun ; 4(1): ycad010, 2024 Jan.
Article en En | MEDLINE | ID: mdl-38328449
ABSTRACT
Arctic sea-ice diatoms fuel polar marine food webs as they emerge from winter darkness into spring. Through their photosynthetic activity they manufacture the nutrients and energy that underpin secondary production. Sea-ice diatom abundance and biomolecular composition vary in space and time. With climate change causing short-term extremes and long-term shifts in environmental conditions, understanding how and in what way diatoms adjust biomolecular stores with environmental perturbation is important to gain insight into future ecosystem energy production and nutrient transfer. Using synchrotron-based Fourier transform infrared microspectroscopy, we examined the biomolecular composition of five dominant sea-ice diatom taxa from landfast ice communities covering a range of under-ice light conditions during spring, in Svalbard, Norway. In all five taxa, we saw a doubling of lipid and fatty acid content when light transmitted to the ice-water interface was >5% but <15% (85%-95% attenuation through snow and ice). We determined a threshold around 15% light transmittance after which biomolecular synthesis plateaued, likely because of photoinhibitory effects, except for Navicula spp., which continued to accumulate lipids. Increasing under-ice light availability led to increased energy allocation towards carbohydrates, but this was secondary to lipid synthesis, whereas protein content remained stable. It is predicted that under-ice light availability will change in the Arctic, increasing because of sea-ice thinning and potentially decreasing with higher snowfall. Our findings show that the nutritional content of sea-ice diatoms is taxon-specific and linked to these changes, highlighting potential implications for future energy and nutrient supply for the polar marine food web.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: ISME Commun Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: ISME Commun Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido