DBIO - Artigos em Revistas Nacionais / Articles in National Journals
Permanent URI for this collection
Artigo ou um editorial publicado numa revista científica.
(Aceite; Publicado; Actualizado).
Browse
Browsing DBIO - Artigos em Revistas Nacionais / Articles in National Journals by Author "Azevedo, José M. N."
Now showing 1 - 10 of 12
Results Per Page
Sort Options
- Centrolabrus caeruleus sp. nov., a long unrecognized species of marine fish (Teleostei: Labridae) from the AzoresPublication . Azevedo, José M. N.A new species of Centrolabrus, C. caeruleus sp. nov. (Teleostei, Labridae) is described from the Azores. This species was long thought to be identical with C. trutta (LOWE, 1833), the other macaronesian species of the genus, but differs from it in size, meristics and male nuptial coloration. C. caeruleus sp. nov. attains a larger size than C. trutta, has higher modal counts of rays (dorsal fin 26 versus 25, anal fin 14 versus 13) and of scales on the lateral line (33-34 versus 31-32), and the males are dark blue instead of bright green.
- Checklist of the fishes collected on the «Santa Maria and Formigas 1990: Scientific Expedition»Publication . Arruda, Luís M.; Azevedo, José M. N.; Heemstra, Phillip C.; Neto, Ana I.The Azores are a group of nine islands stretching eastwards from the Mid-Atlantic ridge, from 36° 55' N and 25° 01' W to 39° 43' N and 31° 07' W. Santa Maria (Sma) is the eastern most island of this archipelago and Formigas (For) is a low jumble of volcanic rock nearby. The ichthyological fauna of these islands is not well known. So, the main purpose of this note is to present a list of the fishes caught on this expedition organized by the Department of Biology of the University or the Azores. Fishes were collected in tidepools mainly with rotenone and (using SCUBA) at depths of about 6, 10, 15 and 25 meters (m) and are deposited in the Museu Bocage, Museu Carlos Machado, J. L. B. Smith Institute, U. S. National Museum or Natural History. The taxonomy or the listed species is given according to Clofnam (HUREAU & MONOD, 1979) and the Clofnam-number is indicated. The records are given in a standard sequence: locality, day, month, depth of water and depth of collection (in meters).
- Checklist of the Pleistocene marine molluscs of Praínha and Lagoínhas (Santa Maria Island, Azores).Publication . Ávila, Sérgio P.; Amen, Rui G.; Azevedo, José M. N.; Cachão, Mário; García-Talavera, FranciscoA critical review of the reported Pleistocene species of and Lagoinhas (Santa Maria Island, Azores) is provided, new data increasing the marine molluscan fauna to 95 taxa (80 Gastropoda and 15 Bivalvia). Six of the reported taxa are considered dubious records (5 Gastropoda, 1 Bivalvia). The stratigraphic sequence of Praia Formosa is composed of two main units, about 2-4 meters above present-day sea level. In the lower unit, Patella ulyssiponensis dominates the fossil assemblage of the basal calcareous conglomerate while Myoforceps arustatus (Dillwyn, 1817) dominates the assemblage associated to a calcareous algae mat. Above a non-depositional hiatus surface, a sandy beach deposit mainly composes the upper unit. Its fossil assemblages are dominated by large amounts of Eruilin castanea (Montagu, 1803) and, in a less extent, Lucinella diwricntn (Linnaeus, 1758) and Ensis minor (Chenu, 1843). The stratigraphic sequence of Lagoinhas, located 7.4 m above present-day sea level, is also composed of two units. A basal conglomerate is fossilized by or passes laterally to a calcareous algae mat, dominated by Myoforceps aristatus and with abundant Calliostoma pecimens. As at Prainha, these lower units are covered by a highly fossiliferous sandy bach deposit, though thinner, in which Ervlie castanea is the dominant species. Some species with Caribbean or West African affinities, the "Strombus bubonius accompanying fauna" (Garcia-Talavera, 1990), were found in the lower layers. The upper layer malacofauna is mainly related to the Mediterranean faunas, similarly to what happens nowadays (Ávila, 2000).
- Checklist of the shallow-water marine molluscs of the Azores: 1 - Pico, Faial, Flores and CorvoPublication . Ávila, Sérgio P.; Azevedo, José M. N.; Gonçalves, João M.; Fontes, Jorge; Cardigos, FredericoAn up-to-date commented check-list of the shallow-water marine molluscs of Pico, Faial, Flores and Corvo islands (Azores, Portugal) is provided, based on literature records, on material deposited at the Department of Biology of the University of the Azores (DBUA) as a result of the scientific expeditions "Flores/89", "Açores/89" and "Pico/91", and on photographic material at the Department of Oceanography and Fisheries/University of the Azores (DOP/UA). The collections of the Museu Carlos Machado - Historia Natural, MCM-HN, of the Museu de Zoologia - Museu de Historia Natural da Faculdade de Ciencias e Tecnologia da Universidade de Coimbra, MZ/MHN-FCTUC, and the mollusc collection deposited at DOP/UA were surveyed and the results are included in this report. Two hundred and fifty five taxa of shallow-water molluscs are reported to Pico, Faial, Flores and Corvo Islands (196 Gastropoda, 50 Bivalvia and 9 Cephalopoda). Of these, 32 are dubious records (23 Gastropoda, 8 Bivalvia and 1 Cephalopoda), there remaining 197 confirmed species to these islands. A total of 26 taxa were identified only down to the genus level (25 Gastropoda and 1 Bivalvia).
- Checklist of the shallow-water marine molluscs of the Azores: 2 - São Miguel Island.Publication . Ávila, Sérgio P.; Azevedo, José M. N.; Gonçalves, João M.; Fontes, José; Cardigos, FredericoThis paper provides an updated checklist of the shallow-water marine molluscs of São Miguel island, based on the data from the bibliography and in the species collected from 1989 on by the Marine Biology teams of the University of the Azores (Ponta Delgada) and of the Department of Oceanography and Fisheries (Horta). The collections of the Museu Carlos Machado - História Natural (MCM-HN), of the Museu de Zoologia - Museu de História Natural da Faculdade de Ciências e Tecnologia da Universidade de Coimbra (MZ/MHN-FCTUC) and the image bank of DOP/UA, Department of Oceanography and Fisheries of the University of the Azores (ImagDOP), were also surveyed and the results are here reported. A total of 235 taxa of shallow water marine molluscs are reported to Slo Miguel island (4 Polyplacophora, 167 Gastropoda, 61 Bivalvia and 3 Cephalopoda). Of these, 10 are dubious records (7 Gastropoda and 3 Bivalvia), there remaining 225 confirmed taxa in this island. A total of 18 taxa were identified only down to the genus level (17 Gastropoda and 1 Bivalvia). Fifteen species are cited for the first time to the Azores: Dikoleps cf. cutleriana (Clark, 1848), (Bouchet & Guillemot, 1978), Cirsotrema cochlea (Sowerby G.B. II, 1844), Opalia bellenica (Forbes, 1844), Bela laevigata (Philippi, 1836), Odostomia nitens Jeffreys, 1870, Gregariella semigranata (Reeve, 1858), Modiolus adriaticus (Lamarck, 1836), Rhomboidella prideauxi (Leach, 1815), Lima lima (Linnaeus, 1758), Kellia cf. suborbicularis (Montagu, 1803), Astarte cf. sulcata (da Costa, 1778), Tellina pygmaea Loven, 1846, Venus nux Gmelin, 1791 and Thracia papyracea (Poli, 1791).
- First record of Thorogobius ephippiatus (Lowe, 1839)(Pisces: Gobiidae) for the AzoresPublication . Azevedo, José M. N.; Neto, Ana I.; Arruda, Luís M.Nesta nota refere-se a primeira captura do peixe da família Gobiidae, Thorogobius ephippiatus nos Açores, com base em 16 indivíduos capturados e ainda em vários outros observados. Referem-se os números de escamas nas séries laterais e de raios na primeira e segunda barbatanas dorsais, na peitoral esquerda e na anal. Descreve-se o arranjo das papilas sensoriais na cabeça.
- Isolamento e seleção de estirpes locais de Haematococcus pluvialis Flotow para produção de astaxantinaPublication . Xavier, Emanuel D.; Furnas, Joan; Azevedo, José M. N.; Reis, Alberto; Teves, Luis; Mota, Gonçalo; Neto, Ana I.As microalgas nativas estão bem adaptadas aos fatores abióticos e bióticos locais predominantes e quando cultivadas localmente é fundamental a seleção de estirpes com potencial biotecnológico. Duas estirpes locais de H. pluvialis foram identificadas e isoladas de poças de água doce em locais distintos. Foram cultivadas por um período de 60 dias em meio de cultura MES esterilizado em câmara de cultura. Medições periódicas foram realizadas para avaliar a produção de biomassa e acumulação de astaxantina. As estirpes locais apresentaram no geral a maior e menor produção de biomassa e acumulação de astaxantina o que demonstra a variabilidade entre estirpes da mesma espécie. Por conseguinte, estirpes locais devem ser avaliadas quando se considera uma exploração em grande escala.
- Life goes on : Oblada melanura (Linnaeus, 1758) (Perciformes, Sparidae), the saddled seabream, expands its distribution range westwards to the AzoresPublication . Azevedo, José M. N.; Neto, Raul M. A.A group of 10 individuals of the saddled seabream, Oblada melanura (Linnaeus, 1758), was photographed at Lajes do Pico Bay, on Pico Island, Azores. This finding represents a significant westward expansion of the known range of this species and may be linked to global warming. A call is therefore made for a monitoring program of the coastal fish fauna of the Azores which would improve the understanding of the effects of climate change and other anthropogenic stressors on marine communities.
- Now you see me, now you don't : a case study of the effect of the sampling method on the perceived struture of Ichthyological communitiesPublication . Azevedo, José M. N.The fish community of a small rocky area near Ponta Delgada, Azores, was assessed using two methods: visual census and rotenone collections. The results obtained with each method are analysed and compared. A total of 46 species was recorded for this site. The visual census recorded more species than did the rotenone collections, but each method detected species that escaped the other. The total fish diversity was found to be similar to that reported in other localized studies of littoral rocky areas of the eastern Atlantic and the Mediterranean. Each method used revealed a different spatial structure and different trophic relationships of the ichthyological community. The visual census put in evidence the pelagic/demersal component, while the rotenone collections emphasized the benthic one. Both methods agree on the importance of the benthic primary production in the trophic food web. Visual census data further suggest that the relevance of the direct consumption of algal material by omnivores and herbivores is greater than could be guessed by the species diversity in this group. Strategies are discussed for combining visual and destructive sampling methods in order to achieve a more accurate representation of a given fish community.
- Scoping the potencial for outdoor microalgae production in the AzoresPublication . Xavier, Emanuel D.; Neto, Ana I.; Reis, Alberto; Azevedo, José M. N.Microalgae cultivation has received much attention due to some desirable characteristics such as fast growth rates, high photosynthetic efficiencies and the production of valuable biochemicals. Mass cultivation of microalgae for commercial purposes is already a reality in some locations being an activity with approximately 45 years. The Azores archipelago, located in the North Atlantic Ocean off the coast of Portugal, features a temperate climate. To evaluate the feasibility of local outdoor microalgae production, certain fundamental factors must be analysed. In this study water, light, temperature, carbon sources, nutrients, international outlook and regional context were analyzed from the perspective of a local outdoor commercial microalgae production. A SWOT analysis was applied to the analysed factors to evaluate the strengths, weaknesses, opportunities and threats. The results nominate the Azores as a promising location to implement an outdoor production of valueadded products from microalgae.