Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula

We studied CO 2 and O 2 dynamics in the western Antarctic Peninsula (WAP) waters in relation to (1) phytoplankton biomass, (2) microbial community primary production and respiration, and (3), for the first time, phytoplankton composition, during summer and fall in 3 consecutive years (2002, 2003 and...

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Autores principales: Moreau, Sébastien, Schloss, Irene R., Mostajir, Behzad, Demers, Serge, Almandoz, Gastón Osvaldo, Ferrario, Martha Elba, Ferreyra, Gustavo A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Botánica
CO 2 sinks
CO 2 sources
Community respiration
Phytoplankton biomass
Phytoplankton composition
Primary production
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84300
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84300
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Botánica
CO 2 sinks
CO 2 sources
Community respiration
Phytoplankton biomass
Phytoplankton composition
Primary production
spellingShingle Botánica
CO 2 sinks
CO 2 sources
Community respiration
Phytoplankton biomass
Phytoplankton composition
Primary production
Moreau, Sébastien
Schloss, Irene R.
Mostajir, Behzad
Demers, Serge
Almandoz, Gastón Osvaldo
Ferrario, Martha Elba
Ferreyra, Gustavo A.
Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
topic_facet Botánica
CO 2 sinks
CO 2 sources
Community respiration
Phytoplankton biomass
Phytoplankton composition
Primary production
description We studied CO 2 and O 2 dynamics in the western Antarctic Peninsula (WAP) waters in relation to (1) phytoplankton biomass, (2) microbial community primary production and respiration, and (3), for the first time, phytoplankton composition, during summer and fall in 3 consecutive years (2002, 2003 and 2004). The areal average of ΔpCO 2 (the difference between surface seawater and atmospheric partial pressure of CO 2) for the 3 yr was significantly negative (.20.04 ± 44.3 μatm, p < 0.01) during the summer to fall period in the region, possibly indicating a CO 2 sink. In the southern WAP (i.e. south of Anvers Island), ΔpCO 2 was significantly negative (.43.60 ± 39.06 μatm) during fall. In the northern WAP (north of Anvers Island), ΔpCO 2 values showed a more complex distribution during summer and fall (.4.96 ± 37.6 and 21.71 ± 22.39 μatm, respectively). Chlorophyll a (chl a) concentration averaged 1.03 ± 0.25 μg l.1 and was higher in the south of the peninsula. Phytoplankton composition influenced chl a concentration with higher and lower values for diatom-and phytoflagellate-dominated communities, respectively. A significant negative correlation existed between chl a and ΔpCO 2. From incubation experiments performed in the northern WAP, respiration was low (averaging 5.1 mmol O 2 m.3 d.1), and the net community production (NCP) correlated negatively with ΔpCO 2 and positively with %O 2 saturation. However, despite the high NCP values measured, ΔpCO 2 was significantly positive in the northern WAP during the summer to fall period. Strong mixing and lower chl a concentration may explain this result. In contrast, ΔpCO 2 was significantly negative in the southern WAP, possibly because of high surface water chl a concentration.
format Articulo
Articulo
author Moreau, Sébastien
Schloss, Irene R.
Mostajir, Behzad
Demers, Serge
Almandoz, Gastón Osvaldo
Ferrario, Martha Elba
Ferreyra, Gustavo A.
author_facet Moreau, Sébastien
Schloss, Irene R.
Mostajir, Behzad
Demers, Serge
Almandoz, Gastón Osvaldo
Ferrario, Martha Elba
Ferreyra, Gustavo A.
author_sort Moreau, Sébastien
title Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
title_short Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
title_full Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
title_fullStr Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
title_full_unstemmed Influence of microbial community composition and metabolism on air.sea ΔpCO 2 variation off the western Antarctic Peninsula
title_sort influence of microbial community composition and metabolism on air.sea δpco 2 variation off the western antarctic peninsula
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/84300
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