Assessing the efficiencies and challenges for nutrient uptake by aquatic plants

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http://hdl.handle.net/10138/308898

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Angove , C , Norkko , A & Gustafsson , C 2018 , ' Assessing the efficiencies and challenges for nutrient uptake by aquatic plants ' , Journal of Experimental Marine Biology and Ecology , vol. 507 , pp. 23-30 . https://doi.org/10.1016/j.jembe.2018.07.005

Titel: Assessing the efficiencies and challenges for nutrient uptake by aquatic plants
Författare: Angove, Charlotte; Norkko, Alf; Gustafsson, Camilla
Upphovmannens organisation: Marine Ecosystems Research Group
Tvärminne Zoological Station
Ecosystems and Environment Research Programme
Tvärminne Benthic Ecology Team
Datum: 2018-10
Språk: eng
Sidantal: 8
Tillhör serie: Journal of Experimental Marine Biology and Ecology
ISSN: 0022-0981
DOI: https://doi.org/10.1016/j.jembe.2018.07.005
Permanenta länken (URI): http://hdl.handle.net/10138/308898
Abstrakt: Aquatic plant meadows are valuable components to the 'coastal filter' and it is important to understand the processes that drive their ability to cycle nutrients. However, at present, the field-based evidence for understanding the drivers of nutrient uptake by plants is lacking. This study aimed to investigate how well individual shoots of aquatic plants could meet their nitrogen demands using the sediment nutrient pool (porewater ammonium) and to explore which traits helped to facilitate such uptake. Several species were investigated in shallow, submerged (2-4 m) mixed-species communities in the northern Baltic Sea using incubation experiments with enriched ammonium. After a 3.5 h incubation time, individuals were collected and analysed for nitrogen (% DW) and N-15 (at-%) concentrations. Uptake by plants was calculated per unit nitrogen in response to the N-15 labelled source and to overall nitrogen availability. Background porewater ammonium availability was highly variable between individual plants. Species identity did not significantly affect uptake metrics and the effect of ambient porewater availability was weak. As biomass increased there were significant logarithmic declines in the 95th quantiles of nutrient uptake rates, ambient porewater nutrient availability and aboveground nitrogen tissue concentrations (% DW). Such findings suggested that uptake rates of plants were significantly demand driven and the nutrient conditions of the porewater were significantly driven by the demands of the plant. Findings parameterised the unfulfilled potential for some aquatic plants to cycle nutrients more efficiently and highlighted the potential importance of access to new nutrient sources as a way of enhancing nutrient cycling by aquatic plants. Plant traits and community properties such as the activity of infauna could facilitate such an access and are likely important for nutrient uptake.
Subject: Nitrogen
Functional traits
Seagrass
Baltic Sea
Sediment
Zostera marina
Nutrient cycling
Nutrient enrichment
SUSPENSION-FEEDING BIVALVES
SEDIMENT-WATER INTERFACE
THALASSIA-TESTUDINUM
CARBONATE ENVIRONMENT
SEAGRASS PRODUCTIVITY
ZOSTERA-MARINA
NITROGEN
PHOSPHORUS
GROWTH
SCALE
1172 Environmental sciences
1181 Ecology, evolutionary biology
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: acceptedVersion


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