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dc.contributor.author
Guinder, Valeria Ana
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dc.contributor.author
Popovich, Cecilia Angelines
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dc.contributor.author
Molinero, Juan Carlos
dc.contributor.author
Marcovecchio, Jorge Eduardo
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dc.date.available
2017-01-16T17:43:17Z
dc.date.issued
2013-01
dc.identifier.citation
Guinder, Valeria Ana; Popovich, Cecilia Angelines; Molinero, Juan Carlos; Marcovecchio, Jorge Eduardo; Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions; Elsevier; Continental Shelf Research; 52; 1-2013; 150-158
dc.identifier.issn
0278-4343
dc.identifier.uri
http://hdl.handle.net/11336/11379
dc.description.abstract
We examined austral summer phytoplankton data (December-March) that cover the years 1978-2008 and compared with physico-chemical and meteorological variations in the Bahía Blanca Estuary, Argentina. During the years 1978-1982, 1992-1993 and 2006-2008, counts of phytoplankton abundance showed an increase in recent summers; from a mean value of 12 x 103 cells L-1 in 1978 to 2239 x 103 cells L-1 in 2008, while the chlorophyll concentration remained relatively constant (8.5 ± 2.5 μg L-1, CV = 27 %) over the continuous time series (1978-2008). The rise in the ratio "cell abundance:chlorophyll concentration" was linked to modifications in species composition, from dominance of phytoflagellates (10-20 μm) and relatively large diatoms (e.g. Cyclotella striata, 25-38 μm, Paralia sulcata 15-70 μm, Cerataulina pelagica 18-30 μm, Thalassiosra hendeyi, 27-52 μm) towards the dominance of the small (5-15 μm) centric diatom Thalassiosira minima, which reached > 80 % of the total phytoplankton abundance in summers 2006-2008. The Bahía Blanca Estuary has undergone climate modifications and increasing anthropogenic disturbances during the last three decades. In the early 1990s, regional climatic conditions revealed a significant shift. Additionally, dredging activities were initiated to allow the traffic of large ships, rising the levels of suspended sediments, and the invasive copepod Eurytemora americana was introduced via ballast waters into the estuary and has displaced the dominance of the native copepod Acartia tonsa towards summer periods. The examination of physico-chemical conditions of the estuary showed a trend to increase in the minima of water temperature and higher water turbidity, dissolved phosphate, nitrite and nitrate concentrations in the pelagic environment in recent summers. We discuss the potential effects of these changes and trophic interactions on the structure and composition of the phytoplankton summer blooms in this temperate and eutrophic estuary in the Southwestern Atlantic.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Phytoplankton Summer Blooms
dc.subject
Physico-Chemical Modifications
dc.subject
Dredging Activities
dc.subject
Resuspension
dc.subject
Temperate Estuary
dc.subject
Trophic Interactions
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-01T19:38:49Z
dc.journal.volume
52
dc.journal.pagination
150-158
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Guinder, Valeria Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
dc.description.fil
Fil: Popovich, Cecilia Angelines. Universidad Nacional del Sur; Argentina
dc.description.fil
Fil: Molinero, Juan Carlos. Geomar-helmholtz Centre For Ocean Research Kiel; Alemania
dc.description.fil
Fil: Marcovecchio, Jorge Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
dc.journal.title
Continental Shelf Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.csr.2012.11.010
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0278434312003196
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