Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/148364
Title: Uptake and trophic transfer of nitrogen and carbon in a temperate forested headwater stream
Author: Abril Cuevas, Meritxell
Bastias, Elliot
Schiller Calle, Daniel von
Martí Roca, Eugènia
Menéndez López, Margarita
Muñoz Gràcia, Isabel
Keywords: Cursos d'aigua
Carboni
Nitrats
Rivers
Carbon
Nitrates
Issue Date: 28-Sep-2019
Publisher: Springer Verlag
Abstract: In temperate headwater streams, riparian forests hinder the development of algae by reducing light availability and generate large inputs of detritus. Microbial assemblages associated with this detritus are expected to strongly influence in-stream elemental cycling. However, most research has focused on quantifying nitrogen (N) cycling while we know little about the coupling of N and carbon (C) cycling. We conducted a simultaneous whole-reach tracer addition of 15N-ammonium and 13C-acetate in a forested headwater stream to examine the importance of different primary uptake compartments (e.g. epilithic biofilm, leaves, small wood) on N and C uptake, storage, and transfer to consumers. We predicted high whole-reach uptake of N and C from the water column to satisfy requirements of microbial decomposers. We also predicted a dominant role of the abundant detrital compartments, especially leaf litter, in the uptake, storage and trophic transfer of these labile forms of N and C. Our results show efficient immobilization of both ammonium and acetate along the study reach. Leaf litter showed the highest percentage of contribution among all compartments to whole-reach ammonium and acetate uptake. We also found evidence of rapid transfer of N and C to higher trophic levels, thereby extending the retention time of these elements within the ecosystem. Overall, our study provides relevant insights into the influence of detritus on N and C cycling in headwater streams.
Note: Versió postprint del document publicat a: https://doi.org/10.1007/s00027-019-0672-x
It is part of: Aquatic Sciences - Research Across Boundaries, 2019, vol. 81, num. 75
URI: http://hdl.handle.net/2445/148364
Related resource: https://doi.org/10.1007/s00027-019-0672-x
ISSN: 1015-1621
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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