Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic
presentacion Natural abundance of stable N isotopes (d15N) in both individual amino acids and bulk organic matter of size-fractionated plankton samples were compared to analyze the differential impact of nitrogen fixation through the food web, in a transect across the subtropical North Atlantic. Low...
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Centro Oceanográfico de A Coruña
2016
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ftcsic:oai:digital.csic.es:10261/316661 2024-02-11T10:06:18+01:00 Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic Mompeán-de-la-Rosa M.C. (María del Carmen) Bode, A. (Antonio) Gier, E. McCarthy, M.D. Bergen (Norway) Atlantic Ocean North Atlantic 2016-05-27T08:35:58Z http://hdl.handle.net/10508/10153 http://hdl.handle.net/10261/316661 en eng Centro Oceanográfico de A Coruña Malaspina-2010 (CSD2008-00077), NSF Grant OCE-1131816 http://hdl.handle.net/10508/10153 http://hdl.handle.net/10261/316661 S8 ID19 ICES/PICES 6th. Zooplankton Production Symposium. (09/05/2016 - 13/05/2016. Bergen (Noruega)). today. S8 ID19. En: , . 21716 open Stable isotopes δ15N Plankton Compound-specific N fixation Amino acids Diazotrophy Trophic position Subtropical conference output 2016 ftcsic 2024-01-16T11:44:37Z presentacion Natural abundance of stable N isotopes (d15N) in both individual amino acids and bulk organic matter of size-fractionated plankton samples were compared to analyze the differential impact of nitrogen fixation through the food web, in a transect across the subtropical North Atlantic. Low d15N values in the central and western regions were consistent with the prevalence of nitrogen fixation, while maximum d15N values tracked the influence of West African upwelling in the eastern zone. Compound-specific amino acid isotope data (CSI-AA) revealed relatively low variability in the impact of diazotrophic nitrogen within the different plankton size fractions, while d15N of bulk organic matter showed higher variability with size. Moreover, CSI-AA results also indicated a greater importance of diazotrophy than suggested by bulk d15N values. Trophic position estimates using CSI-AA showed the expected general increase with mean plankton size class and varied in a relatively narrow range (1.8 to 2.5), with the lowest values in the central zone. Using isotopic δ15N values of individual amino acids (in particular Phe and Thr), as well as reconstructed total protein d15N values, a set of new relationships with bulk plankton d15N was determined, aimed to improve the use CSI-AA data in tracing direct plankton contributions to organic nitrogen pools in the ocean. These new results represent the most detailed investigation of CSI-AA data in zooplankton size classes to date, and point to a key role of large zooplankton in the transmission of the diazotrophic nitrogen up oceanic food webs. Malaspina-2010(CSD2008-00077), NSF Grant OCE-1131816 Conference Object North Atlantic Digital.CSIC (Spanish National Research Council) Bergen Norway |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Stable isotopes δ15N Plankton Compound-specific N fixation Amino acids Diazotrophy Trophic position Subtropical |
spellingShingle |
Stable isotopes δ15N Plankton Compound-specific N fixation Amino acids Diazotrophy Trophic position Subtropical Mompeán-de-la-Rosa M.C. (María del Carmen) Bode, A. (Antonio) Gier, E. McCarthy, M.D. Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
topic_facet |
Stable isotopes δ15N Plankton Compound-specific N fixation Amino acids Diazotrophy Trophic position Subtropical |
description |
presentacion Natural abundance of stable N isotopes (d15N) in both individual amino acids and bulk organic matter of size-fractionated plankton samples were compared to analyze the differential impact of nitrogen fixation through the food web, in a transect across the subtropical North Atlantic. Low d15N values in the central and western regions were consistent with the prevalence of nitrogen fixation, while maximum d15N values tracked the influence of West African upwelling in the eastern zone. Compound-specific amino acid isotope data (CSI-AA) revealed relatively low variability in the impact of diazotrophic nitrogen within the different plankton size fractions, while d15N of bulk organic matter showed higher variability with size. Moreover, CSI-AA results also indicated a greater importance of diazotrophy than suggested by bulk d15N values. Trophic position estimates using CSI-AA showed the expected general increase with mean plankton size class and varied in a relatively narrow range (1.8 to 2.5), with the lowest values in the central zone. Using isotopic δ15N values of individual amino acids (in particular Phe and Thr), as well as reconstructed total protein d15N values, a set of new relationships with bulk plankton d15N was determined, aimed to improve the use CSI-AA data in tracing direct plankton contributions to organic nitrogen pools in the ocean. These new results represent the most detailed investigation of CSI-AA data in zooplankton size classes to date, and point to a key role of large zooplankton in the transmission of the diazotrophic nitrogen up oceanic food webs. Malaspina-2010(CSD2008-00077), NSF Grant OCE-1131816 |
format |
Conference Object |
author |
Mompeán-de-la-Rosa M.C. (María del Carmen) Bode, A. (Antonio) Gier, E. McCarthy, M.D. |
author_facet |
Mompeán-de-la-Rosa M.C. (María del Carmen) Bode, A. (Antonio) Gier, E. McCarthy, M.D. |
author_sort |
Mompeán-de-la-Rosa |
title |
Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
title_short |
Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
title_full |
Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
title_fullStr |
Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
title_full_unstemmed |
Amino acid stable N isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical N Atlantic |
title_sort |
amino acid stable n isotope estimations reveal uniform diazotrophic contributions across zooplankton size fractions in the subtropical n atlantic |
publisher |
Centro Oceanográfico de A Coruña |
publishDate |
2016 |
url |
http://hdl.handle.net/10508/10153 http://hdl.handle.net/10261/316661 |
op_coverage |
Bergen (Norway) Atlantic Ocean North Atlantic |
geographic |
Bergen Norway |
geographic_facet |
Bergen Norway |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Malaspina-2010 (CSD2008-00077), NSF Grant OCE-1131816 http://hdl.handle.net/10508/10153 http://hdl.handle.net/10261/316661 S8 ID19 ICES/PICES 6th. Zooplankton Production Symposium. (09/05/2016 - 13/05/2016. Bergen (Noruega)). today. S8 ID19. En: , . 21716 |
op_rights |
open |
_version_ |
1790603927484366848 |