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Abstract:

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.

Registro:

Documento: Artículo
Título:Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S)
Autor:Santoferrara, L.F.; Alder, V.A.
Filiación:Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Cientificas y Tecnicas, Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina
Instituto Antartico Argentino, Cerrito 1248, C1010AAZ, Buenos Aires, Argentina
Palabras clave: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
Año:2009
Volumen:73
Número:4
DOI: http://dx.doi.org/10.3989/scimar.2009.73n4701
Título revista:Scientia Marina
Título revista abreviado:Sci. Mar.
ISSN:02148358
CODEN:SCIME
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_02148358_v73_n4_p_Santoferrara.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02148358_v73_n4_p_Santoferrara

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Citas:

---------- APA ----------
Santoferrara, L.F. & Alder, V.A. (2009) . Morphological variability, spatial distribution and abundance of Helicostomella species (Ciliophora: Tintinnina) in relation to environmental factors (Argentine shelf; 40-55°S) . Scientia Marina, 73(4).
http://dx.doi.org/10.3989/scimar.2009.73n4701
---------- CHICAGO ----------
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) " . Scientia Marina 73, no. 4 (2009).
http://dx.doi.org/10.3989/scimar.2009.73n4701
---------- MLA ----------
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) " . Scientia Marina, vol. 73, no. 4, 2009.
http://dx.doi.org/10.3989/scimar.2009.73n4701
---------- VANCOUVER ----------
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) . Sci. Mar. 2009;73(4).
http://dx.doi.org/10.3989/scimar.2009.73n4701