Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)

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For the first time a taxonomic and ecological study of species belonging to Helicostomella was performed over a mesoscale spatial distribution by examining ca. 3000 loricae collected in Argentine shelf waters during the austral autumn. Microscopic and statistical analysis revealed that the general s...

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Autores principales: Santoferrara, L.F., Alder, V.A.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2009
Materias:
Abundance
Environmental factors
Fronts
Genus Helicostomella
Lorica polymorphism
Shelf dynamics
Tintinnids
abundance
ciliate
morphology
oceanic front
shelf dynamics
spatial distribution
taxonomy
Argentina
Buenos Aires [Argentina]
South America
Ciliophora
Helicostomella
Helicostomella subulata
Lorica
Tintinnida
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02148358_v73_n4_p_Santoferrara
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_02148358_v73_n4_p_Santoferrara
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spelling paperaa:paper_02148358_v73_n4_p_Santoferrara2023-06-12T16:47:08Z Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S) Sci. Mar. 2009;73(4) Santoferrara, L.F. Alder, V.A. Abundance Environmental factors Fronts Genus Helicostomella Lorica polymorphism Shelf dynamics Tintinnids abundance ciliate morphology oceanic front shelf dynamics spatial distribution taxonomy Argentina Buenos Aires [Argentina] South America Ciliophora Helicostomella Helicostomella subulata Lorica Tintinnida For the first time a taxonomic and ecological study of species belonging to Helicostomella was performed over a mesoscale spatial distribution by examining ca. 3000 loricae collected in Argentine shelf waters during the austral autumn. Microscopic and statistical analysis revealed that the general shape and the oral diameter remained practically constant in the whole area surveyed, despite a continuous length fluctuation of ca. 300 μm, which includes the entire range present in eight previously reported species. Consequently, we consider that the genus may be represented only by H. subulata, whose strong fluctuations in length (mostly attributed to an increase in the collar length), density and biomass seem to respond to temperature, food availability and front-related processes. In Buenos Aires coastal waters associated with a quasi permanent estuarine front (40-40.5°S), mixed conditions would favour moderate abundances of long loricae, whereas in northern (42.5-45.5°S) and southern (46-54.5°S) Patagonian waters, high (103 ind. L-1) and low (<5 ind. L-1) densities of short loricae seem to be a consequence of stratification and encystment, respectively. The non-occurrence of the species at 41-42°S, together with a three-fold reduction in length-related parameters between specimens from Buenos Aires and Patagonian waters, suggests a disjunct distribution. Fil:Santoferrara, L.F. 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. 2009 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02148358_v73_n4_p_Santoferrara
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Abundance
Environmental factors
Fronts
Genus Helicostomella
Lorica polymorphism
Shelf dynamics
Tintinnids
abundance
ciliate
morphology
oceanic front
shelf dynamics
spatial distribution
taxonomy
Argentina
Buenos Aires [Argentina]
South America
Ciliophora
Helicostomella
Helicostomella subulata
Lorica
Tintinnida
spellingShingle Abundance
Environmental factors
Fronts
Genus Helicostomella
Lorica polymorphism
Shelf dynamics
Tintinnids
abundance
ciliate
morphology
oceanic front
shelf dynamics
spatial distribution
taxonomy
Argentina
Buenos Aires [Argentina]
South America
Ciliophora
Helicostomella
Helicostomella subulata
Lorica
Tintinnida
Santoferrara, L.F.
Alder, V.A.
Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
topic_facet Abundance
Environmental factors
Fronts
Genus Helicostomella
Lorica polymorphism
Shelf dynamics
Tintinnids
abundance
ciliate
morphology
oceanic front
shelf dynamics
spatial distribution
taxonomy
Argentina
Buenos Aires [Argentina]
South America
Ciliophora
Helicostomella
Helicostomella subulata
Lorica
Tintinnida
description For the first time a taxonomic and ecological study of species belonging to Helicostomella was performed over a mesoscale spatial distribution by examining ca. 3000 loricae collected in Argentine shelf waters during the austral autumn. Microscopic and statistical analysis revealed that the general shape and the oral diameter remained practically constant in the whole area surveyed, despite a continuous length fluctuation of ca. 300 μm, which includes the entire range present in eight previously reported species. Consequently, we consider that the genus may be represented only by H. subulata, whose strong fluctuations in length (mostly attributed to an increase in the collar length), density and biomass seem to respond to temperature, food availability and front-related processes. In Buenos Aires coastal waters associated with a quasi permanent estuarine front (40-40.5°S), mixed conditions would favour moderate abundances of long loricae, whereas in northern (42.5-45.5°S) and southern (46-54.5°S) Patagonian waters, high (103 ind. L-1) and low (<5 ind. L-1) densities of short loricae seem to be a consequence of stratification and encystment, respectively. The non-occurrence of the species at 41-42°S, together with a three-fold reduction in length-related parameters between specimens from Buenos Aires and Patagonian waters, suggests a disjunct distribution.
format Artículo
Artículo
publishedVersion
author Santoferrara, L.F.
Alder, V.A.
author_facet Santoferrara, L.F.
Alder, V.A.
author_sort Santoferrara, L.F.
title Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
title_short Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
title_full Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
title_fullStr Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
title_full_unstemmed Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
title_sort morphological variability, spatial distribution and abundance of helicostomella species (ciliophora: tintinnina) in relation to environmental factors (argentine shelf; 40-55°s)
publishDate 2009
url http://hdl.handle.net/20.500.12110/paper_02148358_v73_n4_p_Santoferrara
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