Ecology and morphological characterization of gametophyte and 'Chantransia' stages of Sirodotia huillensis (Batrachospermales, Rhodophyta) from a stream in central Mexico

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dc.contributor.authorCarmona, Javier
dc.contributor.authorMontejano, Gustavo
dc.contributor.authorNecchi Júnior., Orlando
dc.contributor.institutionUniversidad Nacional Autónoma del México (UNAM)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:21:52Z
dc.date.available2014-05-27T11:21:52Z
dc.date.issued2006-06-01
dc.description.abstractThe morphology and phenology of Sirodotia huillensis was evaluated seasonally in a central Mexican first-order calcareous stream. Water temperature was constant (24-25°C) and pH circumneutral to alkaline (6.7-7.9), and calcium and sulfates were the dominant ions. The gametophyte stages were characterized by the presence of a distinctive mucilaginous layer, a marked difference in phycocyanin to phycoerythrin ratio between female and male plants, and the presence of a carpogonia with a large trichogyne (>60 μm). Occasionally three capogonia were observed on a single basal cell. The 'Chantransia' stages were morphologically similar to those described for the other members of Batrachospermales. A remarkable observation was the formation of dome-shaped structures, consisting of prostrate filaments that are related with the development of new gametophytes. Chromosome numbers were n = 4 for fascicle cells, cortical filament cells and dome-shaped cells, and 2n = 8 for gonimoblast filament cells and 'Chantransia' stage filaments. Gametophytes and 'Chantransia' stages occurred in fast current velocities (60-170 cm/s) and shaded (33.1-121 μmol photons/m2/s) stream segments. The population fluctuated throughout the study period in terms of percentage cover and frequency: the 'Chantransia' stages were most abundant in the rainy season, whereas gametophytic plants had the highest frequency values during the dry season. These results were most likely a result of fluctuations in rainfall and related changes in current velocity. Some characteristics of this population can be viewed as probable adaptations to high current velocities: the mucilaginous layer around plants that reduces drag; potential increase in fertilization by the elongate and plentiful trichogynes and abundant dome-shaped structures producing several gametophytes.en
dc.description.affiliationFaculty of Sciences National Autonomous University of Mexico (UNAM) Ciudad Universitaria, México DF
dc.description.affiliationSaõ Paulo State University Zoology and Botany Department, Sao Jose do Rio Preto, SP
dc.format.extent108-115
dc.identifierhttp://dx.doi.org/10.1111/j.1440-1835.2006.00417.x
dc.identifier.citationPhycological Research, v. 54, n. 2, p. 108-115, 2006.
dc.identifier.doi10.1111/j.1440-1835.2006.00417.x
dc.identifier.issn1322-0829
dc.identifier.issn1440-1835
dc.identifier.scopus2-s2.0-33745947048
dc.identifier.urihttp://hdl.handle.net/11449/68897
dc.language.isoeng
dc.relation.ispartofPhycological Research
dc.relation.ispartofjcr1.275
dc.relation.ispartofsjr0,411
dc.relation.ispartofsjr0,411
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subject'Chantransia' stages
dc.subjectBatrachospermales
dc.subjectEcology
dc.subjectGametophyte
dc.subjectMorphology
dc.subjectRhodophyta
dc.subjectSirodotia huillensis
dc.subjectStream
dc.subjectgametophyte
dc.subjectmorphology
dc.subjectphenology
dc.subjectred alga
dc.subjectwater temperature
dc.subjectMexico [Mexico (NTN)]
dc.subjectMexico [North America]
dc.subjectNorth America
dc.subjectChantransia
dc.subjectTrichogyne
dc.titleEcology and morphological characterization of gametophyte and 'Chantransia' stages of Sirodotia huillensis (Batrachospermales, Rhodophyta) from a stream in central Mexicoen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html

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