Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean
17 pages, 12 figures, 3 tables
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| Format: | artículo biblioteca |
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Pergamon Press
2014-12
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| Subjects: | NW Mediterranean, Mesoscale, Primary production, Chlorophyll a, Phytoplankton, Seasonal bloom, |
| Online Access: | http://hdl.handle.net/10261/108522 |
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dig-icm-es-10261-1085222020-12-09T17:48:16Z Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean Estrada, Marta Latasa, Mikel Emelianov, Mikhail Gutiérrez-Rodríguez, Andrés Fernández-Castro, B. Isern-Fontanet, Jordi Mouriño-Carballido, Beatriz Salat, Jordi Vidal, Montserrat NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom 17 pages, 12 figures, 3 tables The phytoplankton bloom in the Liguro-Provençal deep convection region represents one of the main fertilization mechanisms in the Mediterranean. This communication examines nano- and microphytoplankton observations, and measurements of primary production and chlorophyll a concentration (Chl a) in the southwestern part of the deep convection region, where such information is scarce. Data were obtained from four cruises, carried out in 2005 (EFLUBIO project) and 2009 (FAMOSO project), covering the seasonality between mid-March and September in the region. Our aims were to constrain primary production estimates and to ascertain the importance of short-term variability on the photosynthetic response of phytoplankton assemblages during bloom, post-bloom and late-summer stratification periods in the area. Overall, the initial slope of the P-E relationship (αB) increased and the Chl a-normalized photosynthetic rate (PmB) decreased with increasing optical depth of sample origin, but there were exceptions. In general, there were marked seasonal trends, with stratification increasing and Chl a concentration, primary production and dissolved inorganic nitrogen and phosphate fluxes decreasing from winter to late summer. Chl a at 5m depth reached a maximum of 7mgm-3 on 25 March 2005, one of the highest values measured in the region. Average surface values (±SD) ranged from respectively 2.4±2.3mgm-3 and 2±0.7mgm-3 in the March 2005 and March 2009 cruises to 0.12±0.01mgm-3 in the September 2009 cruise. Vertically integrated (0-80m) primary production (PPint) attained 1800mgCm-2d-1 in March 2009, with an average of 1024±523mgCm-2d-1, and decreased to a mean of 141±0.43mgCm-2d-1 in September 2009. Superimposed to the seasonal trends, there was a considerable within-cruise variability of biomass and primary production, especially during the spring-winter bloom and post-bloom periods, when PPint could change more than threefold within a few days. These differences were mainly associated with the intense hydrographic mesoscale and sub-mesoscale heterogeneity in the region and with the differences in the physiological and ecological history of the phytoplankton communities inhabiting the different water bodies. In late summer, most PPint variability could be explained by fluctuations in surface incident irradiance. © 2014 Elsevier Ltd. This work was supported by the Spanish Projects EFLUBIOREN2002-04151-C02, FAMOSO (CTM2008-06261-C03) and TURBIMOC (CTM2009-06712-E/MAR), and partially by the Grup de Recerca of the (2009 SGR 588). B.F.-C. holds a FPU fellowship of the Spanish Government Peer Reviewed 2014-12-09T12:22:01Z 2014-12-09T12:22:01Z 2014-12 2014-12-09T12:22:01Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.dsr.2014.08.003 issn: 0967-0637 e-issn: 1879-0119 Deep-Sea Research Part I: Oceanographic Research Papers 94: 45-61 (2014) http://hdl.handle.net/10261/108522 10.1016/j.dsr.2014.08.003 https://doi.org/10.1016/j.dsr.2014.08.003 none Pergamon Press |
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NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom |
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NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom Estrada, Marta Latasa, Mikel Emelianov, Mikhail Gutiérrez-Rodríguez, Andrés Fernández-Castro, B. Isern-Fontanet, Jordi Mouriño-Carballido, Beatriz Salat, Jordi Vidal, Montserrat Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| description |
17 pages, 12 figures, 3 tables |
| format |
artículo |
| topic_facet |
NW Mediterranean Mesoscale Primary production Chlorophyll a Phytoplankton Seasonal bloom |
| author |
Estrada, Marta Latasa, Mikel Emelianov, Mikhail Gutiérrez-Rodríguez, Andrés Fernández-Castro, B. Isern-Fontanet, Jordi Mouriño-Carballido, Beatriz Salat, Jordi Vidal, Montserrat |
| author_facet |
Estrada, Marta Latasa, Mikel Emelianov, Mikhail Gutiérrez-Rodríguez, Andrés Fernández-Castro, B. Isern-Fontanet, Jordi Mouriño-Carballido, Beatriz Salat, Jordi Vidal, Montserrat |
| author_sort |
Estrada, Marta |
| title |
Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| title_short |
Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| title_full |
Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| title_fullStr |
Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| title_full_unstemmed |
Seasonal and mesoscale variability of primary production in the deep winter-mixing region of the NW Mediterranean |
| title_sort |
seasonal and mesoscale variability of primary production in the deep winter-mixing region of the nw mediterranean |
| publisher |
Pergamon Press |
| publishDate |
2014-12 |
| url |
http://hdl.handle.net/10261/108522 |
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