Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions

Autores
Guinder, Valeria Ana; Popovich, Cecilia Angelines; Molinero, Juan Carlos; Marcovecchio, Jorge Eduardo
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Guinder, Valeria Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
Fil: Popovich, Cecilia Angelines. Universidad Nacional del Sur; Argentina
Fil: Molinero, Juan Carlos. Geomar-helmholtz Centre For Ocean Research Kiel; Alemania
Fil: Marcovecchio, Jorge Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
Materia
Phytoplankton Summer Blooms
Physico-Chemical Modifications
Dredging Activities
Resuspension
Temperate Estuary
Trophic Interactions
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/11379
Acceder
id CONICETDig_c7dd95405cb9ea2c7bf0841faa1bb302
oai_identifier_str oai:ri.conicet.gov.ar:11336/11379
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditionsGuinder, Valeria AnaPopovich, Cecilia AngelinesMolinero, Juan CarlosMarcovecchio, Jorge EduardoPhytoplankton Summer BloomsPhysico-Chemical ModificationsDredging ActivitiesResuspensionTemperate EstuaryTrophic Interactionshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We 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.Fil: Guinder, Valeria Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); ArgentinaFil: Popovich, Cecilia Angelines. Universidad Nacional del Sur; ArgentinaFil: Molinero, Juan Carlos. Geomar-helmholtz Centre For Ocean Research Kiel; AlemaniaFil: Marcovecchio, Jorge Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); ArgentinaElsevier2013-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/11379Guinder, 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; 150-1580278-4343enginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.csr.2012.11.010info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0278434312003196info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:04:01Zoai:ri.conicet.gov.ar:11336/11379instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:04:01.695CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
title Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
spellingShingle Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
Guinder, Valeria Ana
Phytoplankton Summer Blooms
Physico-Chemical Modifications
Dredging Activities
Resuspension
Temperate Estuary
Trophic Interactions
title_short Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
title_full Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
title_fullStr Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
title_full_unstemmed Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
title_sort Phytoplankton summer bloom dynamics in the Bahía Blanca Estuary in relation to changing environmental conditions
dc.creator.none.fl_str_mv Guinder, Valeria Ana
Popovich, Cecilia Angelines
Molinero, Juan Carlos
Marcovecchio, Jorge Eduardo
author Guinder, Valeria Ana
author_facet Guinder, Valeria Ana
Popovich, Cecilia Angelines
Molinero, Juan Carlos
Marcovecchio, Jorge Eduardo
author_role author
author2 Popovich, Cecilia Angelines
Molinero, Juan Carlos
Marcovecchio, Jorge Eduardo
author2_role author
author
author
dc.subject.none.fl_str_mv Phytoplankton Summer Blooms
Physico-Chemical Modifications
Dredging Activities
Resuspension
Temperate Estuary
Trophic Interactions
topic Phytoplankton Summer Blooms
Physico-Chemical Modifications
Dredging Activities
Resuspension
Temperate Estuary
Trophic Interactions
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Guinder, Valeria Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
Fil: Popovich, Cecilia Angelines. Universidad Nacional del Sur; Argentina
Fil: Molinero, Juan Carlos. Geomar-helmholtz Centre For Ocean Research Kiel; Alemania
Fil: Marcovecchio, Jorge Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina
description 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.
publishDate 2013
dc.date.none.fl_str_mv 2013-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/11379
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
0278-4343
url http://hdl.handle.net/11336/11379
identifier_str_mv 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
0278-4343
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.csr.2012.11.010
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0278434312003196
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.02095

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