DBIO - Artigos em Revistas Nacionais / Articles in National Journals
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- Additions to the marine molluscs of the Formigas Islets, Azores.Publication . Ávila, Sérgio P.; Fontes, Jorge; Tempera, Fernando; Cardigos, FredericoA fauna malacológica dos ilhéus das Formigas foi abordada por Ávila & Azevedo (1997). A presente lista vem completar e corrigir aquele documento. Seis novos taxa são dados para os Açores: Vitreolina curva (Monterosato, 1874), Nassarius cf. ovoideus (Locard, 1886), Mangelia coarctata (Forbes, 1840), Raphitoma leufroyi (Michaud,1838), Coryphela sp. and Pseudochama gryphina (Lamarck, 1819). O número total de moluscos marinhos das águas pouco profundas dos ilhéus das Formigas ascende agora a 88 taxa (1 Polyplacophora, 66 Gastropoda, 20 Bivalvia e 1 Cephalopoda).
- Antioxidant activity of macroalgae from the AzoresPublication . Paiva, Lisete S.; Patarra, Rita F.; Neto, Ana I.; Lima, Elisabete M. C.; Baptista, José A. B.Free radical scavenging activity (FRSA) was studied to determine the antioxidant activity of 8 common macroalgae species found in the Azores. Species under study were Porphyra sp., Osmundea pinnatifida, Pterocladiella capillacea, Sphaerococcus coronopifolius and Gelidium microdon, from Rhodophyta; Ulva compressa and Chaetomorpha pachynema, from Chlorophyta and Fucus spiralis from Phaeophyta.The antioxidant activity was evaluated in methanolic extract by a decolourisation solution test of 2,2-diphenyl-1-picrylhydrazyl (DPPH), used as a stable radical. The methanolic extracts were obtained from dried biomass by sequential extractions, attaining a final concentration of 2 mg.mL-1. The FRSA values ranged from 19.54% for S. coronopifolius to 60.05% for F. spiralis with standard deviation (SD) varying between 1.41% and 6.80%. Results indicated that the studied seaweeds are a very promising source of biological active compounds with antioxidante properties. The seaweeds were collected in the Azorean islands where seawater pollution levels are low. Consequently, these seaweeds represent a valuable and good source of antioxidante material with superior beneficial effects on human health.
- Approch to the knowledge of Coccinellidade (Coleoptera) species diversity of Madeira and Porto Santo Islands.Publication . Soares, António O.; Elias, Rui B.; Raimundo, ArmandoWe present a list of coccinellids collected in Madeira archipelago and notice the presence of two new species; of Scymnini; Scymnus (Scymnus) abietis (Paykull) and Nephus hiekei Fürsch. We analyse the distribution and abundance at the community level, using the following measures: species richness index, abundance and relative abundance, similarity index, diversity, and evenness. 13 species from 3 families were recorded. Hippodamia variegata was the most abundant one with 29.7 % of the 141 specimens collected. Two main groups of relative abundance were identified. The first group included the 6 most common H. variegata, S. interruptus, C. arcuatus, C. septempunctata, S. levaillanti and R. litura and the second one included S. abietis, L. lophante and R. chrysomeloides. Diversity index values are relatively high. The 6 most common species comprised more than 90 % of the individuals without a very different relative abundance. Many factors other than extinction and immigration could explain the variation of the number of species on islands. The highest number of species collected in Madeira island, compared to Porto Santo, could be related with its higher elevation, soil and substrate types, plant species richness, number of habitat, habitats diversity, structure and heterogeneity of the former.
- Argyresthia atlanticella Rebel (Insecta: Lepidoptera) an excluded agent for Myrica faya Aiton (Myricaceae) biocontrolPublication . Silva, Luís; Markin, George; Tavares, JoãoMyrica faya (Myricaceae), um arbusto ou pequena árvore, considerada como um endemismo lbero-macaronésico, foi classificado como infestante no Hawaii, após a sua introdução por imigrantes portugueses. Argyresthia atlanticella (Lepidoptera, Yponomeutidae), foi encontrada associada a Myrica faya nas ilhas dos Açores na década de 1980, tendo sido considerada como um potencial agente de luta biológica contra aquela planta. Os estados larvares desenvolvem-se sobre flores masculinas e frutos de M. faya, de Abril até Agosto, tendo sido considerados como um meio de diminuir o potencial reprodutor do hospedeiro. No início da década de 1990, estudos de campo revelaram que A. atlanticella também se encontrava associada a Erica scoparia ssp. azorica e Vaccinium cylindraceum (Ericaceae). Adultos e larvas foram encontrados sobre E. scoparia ssp. azorica ao longo de todo o ano. Em testes de oviposição, A. atlanticella preferia os rebentos de E. scoparia ssp. azorica aos de M. faya. O insecto completa o seu ciclo de vida sobre E. scoparia ssp. azorica. Face a estes resultados, excluiu-se A. atlanticella como espécie a utilizar no controlo biológico de M. faya no Hawaii.
- Assessment of Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae) populations in Azorean pastures by light and pheromone traps.Publication . Vieira, Virgílio; Oliveira, Luísa; Garcia, Patrícia; Tavares, JoãoThe number of larvae and seasonal flight activity of the true armyworm, Pseudaletia unipuncta (Haworth) (Lepidoptera, Noctuidae), were monitored during three consecutive years (1992-1994) in pastures in S. Miguel island. P. unipuncta adult flight activity, monitored by light and pheromone traps, varied significantly with altitude, year or season, but was positively correlated between these two trapping systems. The adult sex ratio did not deviate significantly from 1:1. The number of adults captured influenced the performance of the two types of traps, with pheromone trap being more effective at low density of moths. Temperature affected the number of adults captured in light and pheromone traps. Consistent patterns occur year after year, especially between July and October, months with high temperatures associated with some rainfall, corresponding to conditions that are suitable for the growth of the armyworm. The highest number of adults and larvae was observed during the summer and in early autumn. The number of larvae was significantly correlated to the number of adults caught in pheromone traps and in light traps, at all the localities. The use of light and particularly pheromone traps can be very useful for monitoring the population abundance of P. unipuncta in Azorean pastures, as part of integrated pest management programs.
- Avifaune de Corvo (Açores)Publication . Le Grand, GéraldL'île de Corvo avec 17 Km2 est la plus petite des neufs îles composant l'archipel des Açores. Avec l'île de Flores (143 Km2) a 15 Km au Sud-Sud-Ouest, elle fait partie du groupe d'îles le plus occidental de l'archipel. Les îles du groupe central (Terceira, Graciosa, São Jorge, Pico et Faial) se trouvent a plus de 250 Km au Sud-Est. Corvo a pour coordonnées 31° 6' de longitude Ouest et 39° 92' de latitude Nord. Corvo est constitue d'un unique volcan (de périmètre côtier d'environ 16 Km) culminant a 718 m (Morro dos Homens) dont le cratère circulaire possède un petit lac parsemé d'ilots. L'île ne possède pas de rivieres et les cours d'eau plus ou moins permanents qui dominent la zone du village sont canalisés pour assurer l'alimentation en eau de la population.
- Bilan des observations sur les oiseaux d'origine néartique effectuées aux Açores (jusqu'en janvier 1983).Publication . Le Grand, GéraldNous avons retenu les observations de la bibliographie (voir LE GRAND & FURTADO 1982) et nos propres observations jusqu'en Janvier 1983. Ont eté exclus les espèces ayant une repartition Holarctique comme Plectrophenax nivalis et de nombreux limicoles dont les populations sont indistinguables sur le terrain. Les spécimens naturalisés ont été redétermines par moi même, ceux de la collection du Museu Carlos Machado à Ponta Delgada sont spécifies par les initiales MCM. Nos observations personnelles sont indiquées par les initiales GLG.
- Biogeography of Azorean plant invadersPublication . Silva, Luís; Tavares, João; Smith, Clifford W.Alien plants are a major component of the Azorean vascular flora. We present a general biogeographic analysis of the taxa considered as introduced in the Archipelago. This work results from the construction of a data-base of Azorean plant invaders. Of the 996 taxa recorded for the Azores, 6,6% are considered endemic, 10,2% native, 72.6% alien, and 10,5% to be of uncertain status. The percentage of alien taxa is lowest in the Pteridophyta (26,0%) and highest in the Dicotyledoneae (78,9%). Significant differences were found between islands for the proportion of invaders. The highest percentages were found in São Miguel, Terceira and Faial, and the lowest in Flores and Corvo. A quadratic model fitted a regression between percentage of invaders and human population density, and might reflect the existence of a higher propagule pressure in some of the islands. Many of the invaders are also found in mainland Portugal and in other Macaronesian islands. The invaders are largely Palearctic in origin or Sub-cosmopolitan, with a wide geographic distribution, and have also been introduced in other regions of the world.
- 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.
- Check list of the birds of the Azores.Publication . Le Grand, GéraldThis check list contains all records from the Azores up to December 1982 from personal observations and bibliography of the Azores (see Le Grand & Furtado (1982) Bol. Mus. Mun. Funchal 34 (150): 142-190). The relative status of the species mentioned is intended only as a guide, the number of some migratory and wintering species often vary from year to year and lack of observers difficult to obtain accurate status for many species. When races or subspecies are recognized it is indicated. Resident species are, see also table in appendix. Our division would be grateful to receive any records from residents or visiting birdwatchers. Such records should be sent to our office at the University of the Azores. To ensure accuracy in records, it would be appreciated if all records be accompanied by detailed description (photography when possible) for any sighting, in particular for difficult or rare species.