RT journal article
T1 Intracellular nitrate storage by diatoms can be an important nitrogen pool in freshwater and marine ecosystems
A1 Stief, Peter
A1 Schauberger, Clemens
A1 Lund, Marie B.
A1 Greve, Andreas
A1 Abed, Raeid M. M.
A1 Al-Najjar, Mohammad A. A.
A1 Attard, Karl M.
A1 Bonaglia, Stefano
A1 Deutzmann, Jörg S.
A1 Franco-Cisterna, Belén
A1 García Robledo, Emilio Guillermo
A1 Holtappels, Moritz
A1 John, Uwe
A1 Maciute, Adele
A1 Magee, Michael J.
A1 Pors, Rie
A1 Santl-Temkiv, Tina
A1 Scherwass, Anja
A1 Sevilgen, Duygu S.
A1 de Beer, Dirk
A1 Glud, Ronnie
A1 Schramm, Andreas
A1 Kamp, Anja
A2 Biología
AB Identifying and quantifying nitrogen pools is essential for understanding the nitrogen cycle in aquatic ecosystems. The ubiquitous diatoms represent an overlooked nitrate pool as they can accumulate nitrate intracellularly and utilize it for nitrogen assimilation, dissipation of excess photosynthetic energy, and Dissimilatory Nitrate Reduction to Ammonium (DNRA). Here, we document the global co-occurrence of diatoms and intracellular nitrate in phototrophic microbial communities in freshwater (n = 69), coastal (n = 44), and open marine (n = 4) habitats. Diatom abundance and total intracellular nitrate contents in water columns, sediments, microbial mats, and epilithic biofilms were highly significantly correlated. In contrast, diatom community composition had only a marginal influence on total intracellular nitrate contents. Nitrate concentrations inside diatom cells exceeded ambient nitrate concentrations similar to 100-4000-fold. The collective intracellular nitrate pool of the diatom community accounted for <1% of total nitrate in pelagic habitats and 65-95% in benthic habitats. Accordingly, nitrate-storing diatoms are emerging as significant contributors to benthic nitrogen cycling, in particular through Dissimilatory Nitrate Reduction to Ammonium activity under anoxic conditions.The accumulation and storage of nitrate by diatoms can contribute up to 1% of total pelagic nitrate and as much as 95% of total benthic nitrate, which indicates a potentially important contribution of diatoms to benthic nitrogen cycling, according to a global analysis
PB SPRINGERNATURE
SN 2662-4435
YR 2022
FD 2022-07
LK http://hdl.handle.net/10498/27549
UL http://hdl.handle.net/10498/27549
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026