Mostrando recursos 1 - 7 de 7

  1. Cephalopod identification keys to Histioteuthidae, Cranchiidae and Octopodiformes of the Azores, with an updated check-list

    Gomes-Pereira, José N.; Gonçalves, João M.; Clarke, M. R.
    This work is a combination of unpublished cephalopod identification keys compiled by Malcolm R. Clarke for the Azores region (Central North Atlantic) and a review of the Octopoda of the Azores by João Gonçalves (MSc Thesis 1993, originally written in Portuguese), updated with recent literature. A regional list of cephalopod species of the Azores is provided totaling 83 species, with identification keys for: i) Histioteuthidae, including five species; ii) Cranchiidae, including eleven species; and iii) Octopodiformes, including Vampyroteuthis infernalis Chun, 1903 (Order Vampyromorpha), three cirrate and fourteen incirrate octopuses. Separate keys are given for Octopodiformes species. The revisions are discussed...

  2. New data on the fruit flies (Drosophilidae) of Madeira archipelago with notes on the ecology of the endemic Drosophila madeirensis Monclús

    Rego, Carla; Aguiar, António F.; Cravo, Délia; Boieiro, Mário; Silva, Isamberto; Castro, Catarina P.; Menezes, Dilia; Serrano, Artur R. M.
    The first findings of drosophilids from Desertas and Porto Santo islands (Madeira archipelago) are reported and the knowledge on the abundance and distribution of the endemic Drosophila madeirensis Monclús is updated. This Madeiran endemic was found associated with forest habitats, but was not exclusive of Laurisilva. Furthermore, the finding of widespread populations with moderate abundance indicates that presently this species is not endangered. Finally, we provide an updated checklist of the family Drosophilidae occurring in the Madeira archipelago.

  3. Long-term monitoring across elevational gradients (II) : vascular plants on Pico Island (Azores) transect

    Coelho, Márcia Catarina Mendes; Elias, Rui B.; Kluge, Jürgen; Pereira, Fernando E. A.; Henriques, Débora; Aranda, Silvia C.; Borges, Paulo A. V.; Ah-Peng, Claudine; Gabriel, Rosalina
    Pico Island remains one of the last remnants of natural vegetation in the Azores, including the largest natural protected area; nevertheless, habitat change and the spread of exotic plants are visible, especially in those areas where human presence prevails. Currently, the lowlands are vastly occupied by pastures dominated by exotic herbs/grasses and most forests are dominated by Pittosporum undulatum. This paper aims to: i) review previous botanical studies related to elevational gradients; ii) investigate vascular plants composition and abundance in native vegetation, following an elevational transect (from 10 to 2200 m); and iii) investigate some patterns of the recorded diversity...

  4. Spatial and temporal distribution of bottlenose dolphins, Tursiops truncatus, in the Madeira archipelago, NE Atlantic

    Dinis, Ana; Carvalho, A.; Alves, Filipe M. A.; Nicolau, Cátia; Ribeiro, Cláudia; Kaufmann, Manfred; Cañadas, A.; Freitas, Luís
    One of the first steps in understanding the relationships between populations and their habitats is to determine which areas they use with higher frequency. This study used systematic and non-systematic survey data from 2001-2002 and 2004-2012 to determine encounter rates and investigate temporal and spatial distribution of bottlenose dolphins around Madeira, Desertas and Porto Santo islands. A total 24,914 km of search effort was carried out and 199 sightings were recorded. Highest encounter rates were found off the east coast of Madeira and off Porto Santo. Moreover, higher encounter rates occurred over bathymetries ranging between 500-1,000 m during systematic surveys...

  5. Scoping the potencial for outdoor microalgae production in the Azores

    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...

  6. New records of marine invertebrates from Ascencion Island (Central Atlantic)

    Brown, Judith; Downes, K.; Mrowicki, R. J.; Nolan, E. L.; Richardson, Andrew J.; Swinnen, Frank; Wirtz, Peter
    The sea anemone Telmatactis forskalii, the zoanthid Isaurus tuberculatus, the nemertine Baseodiscus delineatus, the echinoderms Ophiocoma wendtii and Mithrodia clavigera, the molluscs Colubraria canariensis, Glyphepithema turtoni, Tonna pennata, Trivia candidula, Melanella eburnea, Melanella n.sp., Echineulima leucophaes, Stylocheilus striatus, Limaria hians, Pteria hirundo and Callistoctopus macropus, and the crustaceans Tetraclitella sp., Oxynaspis celata, Thor amboinensis and Parribacus antarcticus are recorded from Ascension Island for the first time. A new depth record is given for the sea anemone Telmatactis cricoides. An undescribed shrimp species of the genus Lysmata and the shrimp Lysmata moorei were observed to clean fish at night.

  7. Elasmobranch landings in the Portuguese commercial fishery from 1986 to 2009

    Correia, João P.; Morgado, Fernando; Erzini, Karim; Soares, Amadeu M. V. M.
    Portuguese commercial Elasmobranch landings were analysed for the period 1986 – 2009 and revealed that some species may be in danger of overfishing. Landings totalled 122,515 mt, with an average of 5,105 mt landed yearly, with captured sharks, skates and rays representing 8 orders, 14 families and 44 species. Annual landings for the fishery generally decreased over time, with a corresponding increase in price per kilogram. The most landed group, skates (Raja sp.), accounted for 33% of the landings, or 40,344 mt. They were followed by lesser spotted catsharks (Scyliorhinus sp.), Portuguese dogfish (Centroscymnus coelolepis), leafscale gulper sharks (Centrophorus squamosus),...

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