Browsing by Author "Rosas-Alquicira, Edgar"
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- Are the reported coralline red seaweeds species for the Macaronesian region taxonomically still valid?Publication . Rosas-Alquicira, Edgar; Riosmena-Rodriguez, Rafael; Neto, Ana I.
- Choreonema thuretii and Pneophyllum confervicolum (Corallinales, Rhodophyta), new corallines to the Azores.Publication . Couto, Ruben P.; Rosas-Alquicira, Edgar; Rodrigues, Armindo; Neto, Ana I.
- Development of conceptacles in Amphiroa (Corallinales, Rhodophyta)Publication . Rosas-Alquicira, Edgar; Riosmena-Rodríguez, Rafael; Hernández-Carmona, Gustavo; Neto, Ana I.Here, we describe the development of sporangial and gametangial conceptacles for Amphiroa beauvoisii and A. vanbosseae; sporangial conceptacles only for A. misakiensis; and gametangial conceptacles only for A. cryptarthrodia and A. rigida. The descriptions are based on the observation of histological preparations obtained from 112 specimens collected from the Gulf of California, in Mexico, and the Azores archipelago of Portugal. Information on the development of the sporangial conceptacle pore and conceptacle senescence is here described and illustrated for the first time. Four development patterns were observed: two for sporangial conceptacles; one for spermatangial conceptacles; and one for carposporangial conceptacles. The phases of development of the sporangial conceptacle were found to be useful in delimiting species within the genus. Based on the sporangium location on the cavity floor and the pore canal anatomy, the species A. beauvoisii, A. misakiensis and A. vanbosseae can be distinguished from each other.
- Diagnosing characters in Amphiroa (Corallinales) and the genus diversity evaluation in the Azores.Publication . Rosas-Alquicira, Edgar; Riosmena-Rodriguez, Rafael; Neto, Ana I.
- The genus Corallina (Corallinaceae, Corallinales, Rhodophyta) in the Azores (NE Atlantic): character expression and taxonomic evaluationPublication . Couto, Ruben P.; Rosas-Alquicira, Edgar; Rodrigues, Armindo; Neto, Ana I.Morphological and anatomical characters used for segregating species within the genus Corallina (Corallinaceae, Rhodophyta) have been compiled and evaluated in 120 specimens collected in the Azores. The morphological, anatomical and statistical evaluation of the thirty four segregating characters for the genus Corallina performed in the present study revealed no species segregation, either showing no differences across the whole lot of specimens or being highly variable within sets of plants. This suggests that all studied material belongs to one species, so far Ellisolandia elongata (formely Corallina elongata), thus reinforcing old proposed synonyms. A morphological and anatomical account is provided for this species, considering the whole set of studied specimens.
- Marine algal flora of São Miguel Island, AzoresPublication . Neto, Ana I.; Moreu, Ignacio; Rosas-Alquicira, Edgar; León-Cisneros, Karla; Cacabelos, Eva; Botelho, Andrea Z.; Micael, Joana; Costa, Ana C.; Neto, Raul M. A.; Azevedo, José M. N.; Monteiro, Sandra; Resendes, Roberto; Afonso, Pedro; Prestes, Afonso L.; Patarra, Rita F.; Álvaro, Nuno V.; Milla-Figueras, David; Ballesteros, Enric; Fletcher, Robert L.; Farnham, William F.; Tittley, Ian; Parente, Manuela I.BACKGROUND The macroalgal flora of the Island of São Miguel (eastern group of the Azores Archipelago) has attracted the interest of many researchers in the past, the first publications going back to the nineteenth century. Initial studies were mainly taxonomic, resulting in the publication of a checklist of the Azorean benthic marine algae. Later, the establishment of the University of the Azores on the Island permitted the logistic conditions to develop both temporal studies and long-term research and this resulted in a significant increase on research directed at the benthic marine algae and littoral communities of the Island and consequent publications. Prior to the present paper, the known macroalgal flora of São Miguel Island comprised around 260 species. Despite this richness, a significant amount of the research was never made public, notably Masters and PhD theses encompassing information regarding presence data recorded at littoral and sublittoral levels down to a depth of approximately 40 m around the Island and the many collections made, which resulted in vouchers deposited in the AZB Herbarium Ruy Telles Palhinha and the LSM- Molecular Systematics Laboratory at the Faculty of Sciences and Technology of the University of the Azores. The present publication lists the macroalgal taxonomic records, together with information on their ecology and occurrence around São Miguel Island, improving the knowledge of the Azorean macroalgal flora at local and regional scales. NEW INFORMATION A total of 12,781 specimens (including some identified only to genus) belonging to 431 taxa of macroalgae are registered, comprising 284 Rhodophyta, 59 Chlorophyta and 88 Ochrophyta (Phaeophyceae). Of these, 323 were identified to species level (212 Rhodophyta, 48 Chlorophyta and 63 Ochrophyta), of which 61 are new records for the Island (42 Rhodophyta, 9 Chlorophyta and 10 Ochrophyta), one an Azorean endemic (Predaea feldmannii subsp. azorica Gabriel), five are Macaronesian endemisms (the red algae Botryocladia macaronesica Afonso-Carrillo, Sobrino, Tittley & Neto, Laurencia viridis Gil-Rodríguez & Haroun, Millerella tinerfensis (Seoane-Camba) S.M.Boo & J.M.Rico, Phyllophora gelidioides P.Crouan & H.Crouan ex Karsakoff and the green alga Codium elisabethiae O.C.Schmidt), 19 are introduced species (15 Rhodophyta, two Chlorophyta and two Ochrophyta) and 32 are of uncertain status (21 Rhodophyta, five Chlorophyta and six Ochrophyta).
- New additions to the Azorean algal flora with ecological observations on rhodolith formations.Publication . Rosas-Alquicira, Edgar; Riosmena-Rodriguez, Rafael; Neto, Ana I.; Couto, Ruben P.
- New additions to the Azorean algal flora, with ecological observations on rhodolith formationsPublication . Rosas-Alquicira, Edgar; Riosmena-Rodriguez, Rafael; Couto, Ruben P.; Neto, Ana I.Non-geniculate coralline algae are abundant and ecologically important in the Azorean littoral, although they have been investigated only sporadically. This paper is the first report on the occurrence of Neogoniolithon brassica-florida, Lithophyllum crouanii and Phymatolithon calcareum as rhodoliths in the Azores (the first two in Ilhéu de Vila Franca, São Miguel Island, and the third at Lajes do Pico, Pico Island). At each sampling site area and percent cover of rhodoliths were estimated along their depth distribution range, and for each species rhodolith density, branch density, and sphericity were determined. Rhodoliths were distributed between 2 and 4 m depth, and differences were found in the percent cover between sites, and in rhodolith density, maximum length, branch density and sphericity between species, with higher values for Neogoniolithon brassica-florida. Sphericity differences may result from differences in growth characteristics between species.
- Ontogeny of conceptacles in Amphiroa (Corallinales, Rhodophyta)Publication . Rosas-Alquicira, Edgar; Hernández-Carmona, Gustavo; Riosmena-Rodriguez, Rafael; Neto, Ana I.
- Segregating characters used within Amphiroa (Corallinales, Rhodophyta) and taxonomic reevaluation of the genus in the AzoresPublication . Rosas-Alquicira, Edgar; Riosmena-Rodriguez, Rafael; Neto, Ana I.A compilation of the published morphological and anatomical characters used in species diagnosis within the genus Amphiroa (Corallinales, Rhodophyta) was made and their expression was evaluated in 142 specimens collected in the Azores. An evaluation of the genus diversity in this archipelago was undertaken. Morphological and anatomical features here selected as diagnostic characters of Amphiroa in the Azorean plants include shape of the thallus, branching origin, morphology of the apical intergenicula in transverse section, number of cell tiers per mature geniculum and pattern of long vs. short intergenicular tiers of cells. The occurrence of Amphiroa beauvoisii and Amphiroa cryptarthrodia was confirmed in the Azores. The form cyathifera of the species Amphiroa fragilissima is newly reported for the Archipelago. Amphiroa exilis and Amphiroa rigida, the other species recorded in the area, were not observed. A morphological and anatomical account is provided for the studied species and comparisons made with both type material and material from the same species from other regions.