First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary
Vertically stratified bottle plankton samples collected in the Río de La Plata estuary (Atlantic coast of South America at ∼35° S) and in coastal waters off Mar del Plata (∼38° S) in December 1999 and November 2001 yielded up to 394 live cells l-1 of a single new nassellarian species: Lophophaena ri...
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Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v25_n12_p1551_Boltovskoy_oai |
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I28-R145-paper_01427873_v25_n12_p1551_Boltovskoy_oai2020-10-19 Boltovskoy, D. Kogan, M. Alder, V.A. Mianzan, H. 2003 Vertically stratified bottle plankton samples collected in the Río de La Plata estuary (Atlantic coast of South America at ∼35° S) and in coastal waters off Mar del Plata (∼38° S) in December 1999 and November 2001 yielded up to 394 live cells l-1 of a single new nassellarian species: Lophophaena rioplatensis n. sp. (family Plagoniidae). In estuarine waters, the species was recorded at salinities as low as 15.4 p.s.u.; densities in excess of 100 cells l-1 were found at salinities ranging from 16. 9 p.s.u. These extremely high concentrations (the highest ever reported in the literature), as well as the fact that >90% of the individuals recorded contain cytoplasm, indicate that these are self-sustaining populations which thrive in the estuary (and in nearshore coastal waters), probably due to plentiful dissolved silica and an abundant food supply. Lophophaena rioplatensis is the first polycystine brackish-water species described. This finding shows that radiolarian fossils are not unequivocally associated with open-ocean conditions, but may also be useful indicators of coastal and brackish estuarine paleoenvironments. Fil:Boltovskoy, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kogan, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alder, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. Plankton Res. 2003;25(12):1551-1559 estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v25_n12_p1551_Boltovskoy_oai |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-145 |
collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
topic |
estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea |
spellingShingle |
estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea Boltovskoy, D. Kogan, M. Alder, V.A. Mianzan, H. First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
topic_facet |
estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea |
description |
Vertically stratified bottle plankton samples collected in the Río de La Plata estuary (Atlantic coast of South America at ∼35° S) and in coastal waters off Mar del Plata (∼38° S) in December 1999 and November 2001 yielded up to 394 live cells l-1 of a single new nassellarian species: Lophophaena rioplatensis n. sp. (family Plagoniidae). In estuarine waters, the species was recorded at salinities as low as 15.4 p.s.u.; densities in excess of 100 cells l-1 were found at salinities ranging from 16. 9 p.s.u. These extremely high concentrations (the highest ever reported in the literature), as well as the fact that >90% of the individuals recorded contain cytoplasm, indicate that these are self-sustaining populations which thrive in the estuary (and in nearshore coastal waters), probably due to plentiful dissolved silica and an abundant food supply. Lophophaena rioplatensis is the first polycystine brackish-water species described. This finding shows that radiolarian fossils are not unequivocally associated with open-ocean conditions, but may also be useful indicators of coastal and brackish estuarine paleoenvironments. |
format |
Artículo Artículo publishedVersion |
author |
Boltovskoy, D. Kogan, M. Alder, V.A. Mianzan, H. |
author_facet |
Boltovskoy, D. Kogan, M. Alder, V.A. Mianzan, H. |
author_sort |
Boltovskoy, D. |
title |
First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
title_short |
First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
title_full |
First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
title_fullStr |
First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
title_full_unstemmed |
First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary |
title_sort |
first record of a brackish radiolarian (polycystina): lophophaena rioplatensis n. sp. in the río de la plata estuary |
publishDate |
2003 |
url |
http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v25_n12_p1551_Boltovskoy_oai |
work_keys_str_mv |
AT boltovskoyd firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary AT koganm firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary AT alderva firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary AT mianzanh firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary |
_version_ |
1766026663896809472 |