Browsing by Author "Nogueira, Eunice M."
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- Algal collections in the Herbarium Ruy Telles Palhinha, AZB.Publication . Nogueira, Eunice M.; Medeiros, João; Neto, Ana I.
- The algal flora of the Azores: a historical and biogeographical approach.Publication . Terra, Marlene R.; Wallenstein, Francisco; Nogueira, Eunice M.; Neto, Ana I.; Tittley, Ian
- Azorean Coastal Communities. An On-going Study.Publication . Álvaro, Nuno V.; Wallenstein, Francisco; Neto, Ana I.; Nogueira, Eunice M.; Terra, Marlene R.
- Can islets be considered repositories of neighbouring coastal biodiversity?Publication . Moniz, Isadora; Prestes, Afonso L.; Nogueira, Eunice M.; Azevedo, José M. N.; Álvaro, Nuno V.; Neto, Ana I.
- Development of Botryocladia macaronesica (Rhodymeniales, Rhodophyta) under laboratory conditions.Publication . León-Cisneros, Karla; Nogueira, Eunice M.; Neto, Ana I.
- Life-cycle of Scinaia interrupta (Nemaliales, Rhodophyta)Publication . León-Cisneros, Karla; Nogueira, Eunice M.; Riosmena-Rodriguez, Rafael; Neto, Ana I.The life-cycle of Scinaia interrupta (A.P. de Candolle) M. J. Wynne was investigated in vitro using four irradiance regimes: 4, 8, 12 and 16 μmol photons mˉ² sˉ¹. A triphasic heteromorphic life-cycle was observed. Carpospores released by cystocarps of gametophytes collected in the field developed into filamentous tetrasporophytes, which produced tetrahedral tetrasporangia. Tetrasporangial development was accelerated under higher irradiance levels. Tetraspores germinated into filamentous protonemal gametophytes, initially identical to the tetrasporophyte. Filamentous gametophytes developed apical utricles and gave rise directly to the fleshy gametophyte. Further development of the fleshy gametophyte was not observed at the lowest irradiance regime (4 μmol photons mˉ² sˉ¹). The present study reports for the first time the influence of the irradiance regime on the initial tetrasporangial development and in the development of the fleshy gametophyte, and reinforces the importance of light intensity on Scinaia life-cycle. Production of apical utricles by the filamentous gametophyte is newly reported for the genus.
- Life-cycle of Scinaia interrupta (Nemaliales; Rhodophyta)Publication . León-Cisneros, Karla; Nogueira, Eunice M.; Riosmena-Rodriguez, Rafael; Neto, Ana I.
- The marine algal (seaweed) flora of the Azores: 4, further additionsPublication . León-Cisneros, Karla; Tittley, Ian; Terra, Marlene R.; Nogueira, Eunice M.; Neto, Ana I.Eight records of seaweeds are reported new to the mid-Atlantic Azores archipelago. Coelothrix irregularis and Lejolisia sp. fall within their overall distributional range. Sebdenia rodrigueziana and Syringoderma floridana have their north-western limit of distribution there. The islands represent the western limit of occurrence for Antithamnionella boergesenii, Aphanocladia stichidiosa, Sebdenia dichotoma, and Codium effusum. The presente and previous papers in this series reveal the extension in range distribution to the west of many of the new records found in the Azores, raising the question as to why the western Atlantic acts as a barrier to dispersal. The new records presented here increase the current total of species recorded on the Azores to 385 (55 Chlorophyta, 74 Heterokontophyta (Phaeophyceae), and 256 Rhodophyta), showing that this isolated island group supports a relatively rich benthic marine algal flora.
- The use of digital photography for benthic coastal community characterization and quantification.Publication . Álvaro, Nuno V.; Neto, Ana I.; Wallenstein, Francisco; Ferreira, João G.; Nogueira, Eunice M.; Santos, Catarina I.
- The use of digital photography for the definition of coastal biotopes in Azores.Publication . Álvaro, Nuno V.; Wallenstein, Francisco; Neto, Ana I.; Ferreira, João G.; Nogueira, Eunice M.; Santos, Catarina I.; Amaral, A. F.Sampling benthic communities usually requires intensive field and lab work which is generally performed by skilled staff. In algal dominated communities, like those on the shores of the Azores, biotope characterization studies focused on the more conspicuous algae categories, thus reducing the skills required for species identification. The present study compares in situ quadrat quantifications done by a skilled reader, with computer based quadrat quantifications using digital photographic records of the same areas read in situ, accomplished by skilled and non-skilled readers. The study was conducted inter- and subtidally at various shore heights/depths. Quantification of algal coverage, both in situ and computer based, used the point to point method with quadrats of 0.25 m × 0.25 m for the intertidal, and 0.50 m × 0.50 m for the subtidal surveys, both subdivided into 36 intersection points. Significant differences were found between in situ readings and computer based readings of photographic records conducted both by experienced and inexperienced readers. Biotopes identified using in situ data and image based data differ both for the subtidal and intertidal.