Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic)
14 pages, 7 figures, 6 tables, 2 appendixes In order to characterize the natural coccolithophore community occurring offshore Azores and to determine their annual and interannual patterns, monthly samples were collected, from September 2010 to December 2014, in the photic zone off Terceira Island. T...
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Online Access: | http://hdl.handle.net/10261/131911 https://doi.org/10.1016/j.csr.2016.01.019 https://doi.org/10.13039/100008382 |
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ftcsic:oai:digital.csic.es:10261/131911 2024-02-11T10:06:38+01:00 Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) Narciso, Áurea Gallo, Francesca Valente, André Cachão, Mário Cros, Lluïsa Azevedo, Eduardo Brito de Barcelos e Ramos, Joana Fundo Regional para a Ciência e Tecnologia (Portugal) 2016-04-01 http://hdl.handle.net/10261/131911 https://doi.org/10.1016/j.csr.2016.01.019 https://doi.org/10.13039/100008382 unknown Pergamon Press http://dx.doi.org/10.1016/j.csr.2016.01.019 Sí doi:10.1016/j.csr.2016.01.019 issn: 0278-4343 e-issn: 1873-6955 Continental Shelf Research 117: 43-56 (2016) http://hdl.handle.net/10261/131911 http://dx.doi.org/10.13039/100008382 none Living coccolithophores Seasonality Phytoplankton ecology Azores archipelago artículo http://purl.org/coar/resource_type/c_6501 2016 ftcsic https://doi.org/10.1016/j.csr.2016.01.01910.13039/100008382 2024-01-16T10:15:07Z 14 pages, 7 figures, 6 tables, 2 appendixes In order to characterize the natural coccolithophore community occurring offshore Azores and to determine their annual and interannual patterns, monthly samples were collected, from September 2010 to December 2014, in the photic zone off Terceira Island. The present study revealed a clear seasonal distribution and a considerable interannual variability of the living coccolithophore community. The highest coccolithophore abundances were observed during spring and winter months, especially due to the smaller species Emiliania huxleyi and Gephyrocapsa ericsonii. In fact, the highest biomass period was registered during April 2011, associated with enhanced abundance of the overcalcified morphotype of E. huxleyi, which was possibly influenced by subpolar waters and subsequent upwelling conditions. The highest abundances of Gephyrocapsa muellerae were recorded during June 2011 and 2014, indicating that this species characterizes the transition between the period of maximum productivity and the subsequent smoother environmental conditions, the first and the later stages of the phytoplankton succession described by Margalef, respectively. During summer to early fall, a gradual decrease of the overall coccolithophore abundance was observed, while the species richness (Margalef diversity index) increased. A subtropical coccolithophore assemblage mainly composed by Umbellosphaera tenuis, Syracosphaera spp., Discosphaera tubifera, Rhabdosphaera clavigera and Coronosphaera mediterranea indicated the presence of surface warmer waters accompanied by reduced mixing and low nutrients concentration. During late fall to winter, the coccolithophore abundance increased again with a concomitant reduction in species diversity. This is potentially linked to low sea surface temperatures, moderate nutrients concentration and surface mixed layer deepening. During 2011, colder and productive waters led to an increase in the total coccolithophore abundances. On contrary, during 2012, ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Continental Shelf Research 117 43 56 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Living coccolithophores Seasonality Phytoplankton ecology Azores archipelago |
spellingShingle |
Living coccolithophores Seasonality Phytoplankton ecology Azores archipelago Narciso, Áurea Gallo, Francesca Valente, André Cachão, Mário Cros, Lluïsa Azevedo, Eduardo Brito de Barcelos e Ramos, Joana Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
topic_facet |
Living coccolithophores Seasonality Phytoplankton ecology Azores archipelago |
description |
14 pages, 7 figures, 6 tables, 2 appendixes In order to characterize the natural coccolithophore community occurring offshore Azores and to determine their annual and interannual patterns, monthly samples were collected, from September 2010 to December 2014, in the photic zone off Terceira Island. The present study revealed a clear seasonal distribution and a considerable interannual variability of the living coccolithophore community. The highest coccolithophore abundances were observed during spring and winter months, especially due to the smaller species Emiliania huxleyi and Gephyrocapsa ericsonii. In fact, the highest biomass period was registered during April 2011, associated with enhanced abundance of the overcalcified morphotype of E. huxleyi, which was possibly influenced by subpolar waters and subsequent upwelling conditions. The highest abundances of Gephyrocapsa muellerae were recorded during June 2011 and 2014, indicating that this species characterizes the transition between the period of maximum productivity and the subsequent smoother environmental conditions, the first and the later stages of the phytoplankton succession described by Margalef, respectively. During summer to early fall, a gradual decrease of the overall coccolithophore abundance was observed, while the species richness (Margalef diversity index) increased. A subtropical coccolithophore assemblage mainly composed by Umbellosphaera tenuis, Syracosphaera spp., Discosphaera tubifera, Rhabdosphaera clavigera and Coronosphaera mediterranea indicated the presence of surface warmer waters accompanied by reduced mixing and low nutrients concentration. During late fall to winter, the coccolithophore abundance increased again with a concomitant reduction in species diversity. This is potentially linked to low sea surface temperatures, moderate nutrients concentration and surface mixed layer deepening. During 2011, colder and productive waters led to an increase in the total coccolithophore abundances. On contrary, during 2012, ... |
author2 |
Fundo Regional para a Ciência e Tecnologia (Portugal) |
format |
Article in Journal/Newspaper |
author |
Narciso, Áurea Gallo, Francesca Valente, André Cachão, Mário Cros, Lluïsa Azevedo, Eduardo Brito de Barcelos e Ramos, Joana |
author_facet |
Narciso, Áurea Gallo, Francesca Valente, André Cachão, Mário Cros, Lluïsa Azevedo, Eduardo Brito de Barcelos e Ramos, Joana |
author_sort |
Narciso, Áurea |
title |
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
title_short |
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
title_full |
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
title_fullStr |
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
title_full_unstemmed |
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic) |
title_sort |
seasonal and interannual variations in coccolithophore abundance off terceira island, azores (central north atlantic) |
publisher |
Pergamon Press |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/131911 https://doi.org/10.1016/j.csr.2016.01.019 https://doi.org/10.13039/100008382 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1016/j.csr.2016.01.019 Sí doi:10.1016/j.csr.2016.01.019 issn: 0278-4343 e-issn: 1873-6955 Continental Shelf Research 117: 43-56 (2016) http://hdl.handle.net/10261/131911 http://dx.doi.org/10.13039/100008382 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.csr.2016.01.01910.13039/100008382 |
container_title |
Continental Shelf Research |
container_volume |
117 |
container_start_page |
43 |
op_container_end_page |
56 |
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1790604472401002496 |