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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Autores principales:	Boltovskoy, Demetrio, Kogan, Mariela, Alder, Viviana A.
Publicado:	2003
Materias:	estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v25_n12_p1551_Boltovskoy http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_01427873_v25_n12_p1551_Boltovskoy
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spelling	paper:paper_01427873_v25_n12_p1551_Boltovskoy2023-06-08T15:11:29Z First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary Boltovskoy, Demetrio Kogan, Mariela Alder, Viviana A. estuary geographical distribution new record new species radiolaria taxonomy Rio de la Plata South America Nassellaria Polycystinea 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. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v25_n12_p1551_Boltovskoy http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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, Demetrio Kogan, Mariela Alder, Viviana A. 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.
author	Boltovskoy, Demetrio Kogan, Mariela Alder, Viviana A.
author_facet	Boltovskoy, Demetrio Kogan, Mariela Alder, Viviana A.
author_sort	Boltovskoy, Demetrio
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	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v25_n12_p1551_Boltovskoy http://hdl.handle.net/20.500.12110/paper_01427873_v25_n12_p1551_Boltovskoy
work_keys_str_mv	AT boltovskoydemetrio firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary AT koganmariela firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary AT aldervivianaa firstrecordofabrackishradiolarianpolycystinalophophaenarioplatensisnspintheriodelaplataestuary
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First record of a brackish radiolarian (Polycystina): Lophophaena rioplatensis n. sp. in the Río de la Plata estuary

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