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Abstract:

This study focuses on the utility of molecular markers for the discrimination of closely related species in tintinnid ciliates. We analyzed the ecologically important genus Helicostomella by sequencing part of the large-subunit rDNA (LSU rDNA) and the 5.8S rDNA combined with the internally transcribed spacer regions 1 and 2 (5.8S rDNA-ITS) from forty-five individuals collected in NW and SW Atlantic waters and after culturing. Although all described Helicostomella species represent a continuum of morphologies, forms with shorter or longer loricae would correspond to different species according to previous molecular data. Here we observed that long forms show both crypticity (i.e. two almost identical long forms with different DNA sequences) and polymorphism (i.e. some long forms develop significantly shorter loricae after culturing). Reviewing all available tintinnid sequences, we found that 1) three Helicostomella clusters are consistent with different species from a molecular perspective, although these clusters are neither clearly differentiated by their loricae nor unambiguously linked to described species, 2) Helicostomella is closely related (probably to the family or genus level) to four ". Tintinnopsis-like" morphospecies, and 3) if considered separately, neither LSU rDNA nor 5.8S rDNA-ITS completely discriminate closely related species, thus supporting the use of multi-gene barcodes for tintinnids. © 2014 Elsevier GmbH.

Registro:

Documento: Artículo
Título:Discrimination of closely related species in tintinnid ciliates: New insights on crypticity and polymorphism in the genus helicostomella
Autor:Santoferrara, L.F.; Tian, M.; Alder, V.A.; McManus, G.B.
Filiación:Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Rd., Groton, CT 06340, United States
Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA, UBA-CONICET) and Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina
Instituto Antártico Argentino, Dirección Nacional del Antártico, Balcarce, Buenos Aires, 290 C1010AAZ, Argentina
Palabras clave:Closely related species; Cryptic species; DNA barcoding; Molecular markers; Polymorphic species; Tintinnid ciliate; Ciliophora; Helicostomella; Tintinnida; Tintinnopsis; protozoal DNA; ribosomal spacer DNA; ribosome DNA; ribosome RNA; RNA 5.8S; RNA, ribosomal, 26S; sea water; Atlantic Ocean; chemistry; ciliate; classification; cluster analysis; cytology; DNA sequence; genetic variability; genetics; microscopy; molecular genetics; parasitology; phylogeny; Atlantic Ocean; Ciliophora; Cluster Analysis; DNA, Protozoan; DNA, Ribosomal; DNA, Ribosomal Spacer; Genetic Variation; Microscopy; Molecular Sequence Data; Phylogeny; RNA, Ribosomal; RNA, Ribosomal, 5.8S; Seawater; Sequence Analysis, DNA
Año:2015
Volumen:166
Número:1
Página de inicio:78
Página de fin:92
DOI: http://dx.doi.org/10.1016/j.protis.2014.11.005
Título revista:Protist
ISSN:14344610
CODEN:PROTF
CAS:DNA, Protozoan; DNA, Ribosomal; DNA, Ribosomal Spacer; RNA, Ribosomal; RNA, ribosomal, 26S; RNA, Ribosomal, 5.8S
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14344610_v166_n1_p78_Santoferrara

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Citas:

---------- APA ----------
Santoferrara, L.F., Tian, M., Alder, V.A. & McManus, G.B. (2015) . Discrimination of closely related species in tintinnid ciliates: New insights on crypticity and polymorphism in the genus helicostomella. Protist, 166(1), 78-92.
http://dx.doi.org/10.1016/j.protis.2014.11.005
---------- CHICAGO ----------
Santoferrara, L.F., Tian, M., Alder, V.A., McManus, G.B. "Discrimination of closely related species in tintinnid ciliates: New insights on crypticity and polymorphism in the genus helicostomella" . Protist 166, no. 1 (2015) : 78-92.
http://dx.doi.org/10.1016/j.protis.2014.11.005
---------- MLA ----------
Santoferrara, L.F., Tian, M., Alder, V.A., McManus, G.B. "Discrimination of closely related species in tintinnid ciliates: New insights on crypticity and polymorphism in the genus helicostomella" . Protist, vol. 166, no. 1, 2015, pp. 78-92.
http://dx.doi.org/10.1016/j.protis.2014.11.005
---------- VANCOUVER ----------
Santoferrara, L.F., Tian, M., Alder, V.A., McManus, G.B. Discrimination of closely related species in tintinnid ciliates: New insights on crypticity and polymorphism in the genus helicostomella. 2015;166(1):78-92.
http://dx.doi.org/10.1016/j.protis.2014.11.005