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Enhanced transfer of organic matter to higher trophic levels caused by ocean acidification and its implications for export production: A mass balance approach

Artikel i vetenskaplig tidskrift
Författare Tim Boxhammer
Jan Taucher
Lennart T. Bach
Eric P. Achterberg
María Algueró-Muñiz
Jessica Bellworthy
Jan Czerny
Mario Esposito
Mathias Haunost
Dana Hellemann
Andrea Ludwig
Jaw C. Yong
Maren Zark
Ulf Riebesell
Leif G Anderson
Publicerad i PLoS ONE
Volym 13
Nummer/häfte 5
Publiceringsår 2018
Publicerad vid Institutionen för marina vetenskaper
Språk en
Länkar https://doi.org/10.1371/journal.pon...
Ämnesord PELAGIC CARBON FLUXES; TECHNICAL NOTE; BALTIC SEA; COMMUNITY PRODUCTION; PLANKTON COMMUNITY; NITROGEN-FIXATION; ELEVATED CO2; FRESH-WATER; MARINE; MESOCOSM
Ämneskategorier Klimatforskning

Sammanfattning

Ongoing acidification of the ocean through uptake of anthropogenic CO 2 is known to affect marine biota and ecosystems with largely unknown consequences for marine food webs. Changes in food web structure have the potential to alter trophic transfer, partitioning, and biogeochemical cycling of elements in the ocean. Here we investigated the impact of realistic end-of-the-century CO 2 concentrations on the development and partitioning of the carbon, nitrogen, phosphorus, and silica pools in a coastal pelagic ecosystem (Gullmar Fjord, Sweden). We covered the entire winter-to-summer plankton succession (100 days) in two sets of five pelagic mesocosms, with one set being CO 2 enriched (~760 μatm pCO 2 ) and the other one left at ambient CO 2 concentrations. Elemental mass balances were calculated and we highlight important challenges and uncertainties we have faced in the closed mesocosm system. Our key observations under high CO 2 were: (1) A significantly amplified transfer of carbon, nitrogen, and phosphorus from primary producers to higher trophic levels, during times of regenerated primary production. (2) A prolonged retention of all three elements in the pelagic food web that significantly reduced nitrogen and phosphorus sedimentation by about 11 and 9%, respectively. (3) A positive trend in carbon fixation (relative to nitrogen) that appeared in the particulate matter pool as well as the downward particle flux. This excess carbon counteracted a potential reduction in carbon sedimentation that could have been expected from patterns of nitrogen and phosphorus fluxes. Our findings highlight the potential for ocean acidification to alter partitioning and cycling of carbon and nutrients in the surface ocean but also show that impacts are temporarily variable and likely depending upon the structure of the plankton food web.

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