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Repositorio da Universidade dos Açores (8.391 recursos)

O Repositório Institucional da Universidade dos Açores desenvolvido no âmbito do projecto RCAAP.

ARQ - Life and Marine Sciences

Mostrando recursos 1 - 20 de 32

  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    This work is a combination of unpublished cephalopod identification keys compiled by Malcolm R. Clarke for the Azores region (Central North Atlantic) and a review of the Octopoda of the Azores by João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),...

  8. Honeybees (Apis mellifera) collect latex of Azores bellflowers (Azorina vidalii, Campanulaceae)

    Weissmann, Julie A.; Schaefer, Hanno
    The Azores bellflower (Azorina vidalii (H.C.Wats.) Feer, synonym: Campanula vidalii H.C.Wats.) is a small shrub in the bellflower family, Campanulaceae, which is endemic to the Azores archipelago. Its habitats are coastal rocks and cliffs, often with elevated nitrogen levels (sewage water, rubbish) and close to settlements. Azorina is found on all nine islands of the Azores archipelago but is most common on the western islands of Flores and Corvo (Schaefer 2003). The pollination biology of Azorina is still a bit of a mystery: while flower morphology would fit best to bird pollination, birds have never been observed visiting its flowers...

  9. The polygon moray, Gymnothorax polygonius (Poey, 1875) : A new record from Ascension Island, South Atlantic

    Richardson, Andrew J.; Brito, Alberto
    Ascension Island (07°57′S, 14°22′W) is an isolat-ed volcanic edifice in the South Atlantic. The closest land, St. Helena is approximately 700 miles south with the closest land mass of any size being West Africa, 1000 miles to the east. Approximately 1500 miles west of Ascension Island is the coast of Brazil. As such, the fish community of the island is a mixture of eastern and western Atlantic species, although richness is relatively low compared with other similar loca-tions such as Cape Verde (Wirtz et al. 2014). Despite the apparent remoteness of Ascension Island there have been several key publications on...

  10. Summer aggregations of the common eagle ray, Myliobatis aquila

    Afonso, Pedro; Rodrigues, Nuno V.
    The aggregation of multiple individuals is a long known behaviour in a variety of elasmobranchs, including reef sharks (Speed et al. 2011), hammerhead sharks (Klimley & Nelson 1984), whale sharks (Hoffmayer et al. 2007), devilrays (Ward-Page et al. 2013; Sobral & Afonso 2014), stingrays (Semeniuk & Rotley 2008), eagle rays (Silliman & Gruber 1999) and cownose rays (Smith et al. 1987). Various functions have been hypothesised to explain these aggregations, including feeding (e.g. Wilson et al. 2001; Rohner et al. 2013), courtship or mating (Whitney et al. 2004; Dudgeon et al. 2008), and cleaning stations (Dewar et al. 2008). However,...

  11. Sponge perforating lace coral with anticancer activity

    Lino, Sílvia P. P.; Xavier, Joana; Santos, Ricardo S.; Colaço, Ana
    This short note reports results from a pilot study to investigate new anticancer agents from deepsea corals in which colonizing sponges were encountered. The pure white stylasterid coral fans of Errina dabneyi (Pourtalès, 1871) are a conspicuous feature on the upper bathyal slopes in Azorean waters and can be found in depths from 215 to more than 500 m (Wisshak et al. 2009; Braga-Henriques et al. 2013). From the 26 species of Errina known worldwide (most from deeper waters) (Cairns 1983), E. dabneyi seems to be endemic to the Azores Archipelago and the adjacent Mid-Atlantic Ridge region (Zibrowius & Cairns...

  12. First in situ observations of soft bottom megafauna from the Cascais Canyon head

    Gomes-Pereira, José N.; Tojeira, I.; Ribeiro, L. P.; Santos, Ricardo S.; Dias, F.; Tempera, Fernando
    We report the first in situ observations of soft bottom megafauna from the Cascais Canyon head. Observations were collected opportunistically during three technical dives with the ROV Luso between 460-805 m at two locations distanced 1,230 m. The habitats were clas-sified as upper bathyal fine mud. The soft bottom fauna was dominated by burrows of Nephrops norvegicus reaching up to 2.9 burrows/m2, a common habitat along the Portu-guese continental margin. To our knowledge, densities are the highest ever reported for depths below 300 m. The ichthyofauna at the upper Cascais Canyon is a mixture of lower shelf and upper bathyal...

  13. Arthropods and other Biota associated with the Azorean Trees and Shrubs : Juniperus brevifolia

    Nunes, Rui; Gabriel, Rosalina; Elias, Rui B.; Rigal, François; Borges, Paulo A. V.
    This work aims to characterize the arthropods and other biota (lichens, bryophytes, vascular plants and birds) associated with the Azorean endemic tree, Juniperus brevifolia. This is the first of a series of publications that will (i) provide a comprehensive list of all the biota associated with the main Azorean endemic trees and shrubs, (ii) describe in detail the diver-sity, abundance and spatial patterns of canopy arthropods, and (iii) whenever possible, to extend biodiversity assessments to communities of bryophytes, lichens, vascular plants and vertebrates. We use standardized sampled data from BALA project for canopy arthropods and for the remaining taxa we...

  14. Screening for angiotensin I-converting enzyme (ACE) inhibitory activity of enzymatic hydrolysates obtained from Azorean macroalgae

    Paiva, Lisete S.; Lima, Elisabete M. C.; Neto, Ana I.; Baptista, José A. B.
    As part of ongoing studies into the isolation of antihypertensive peptides, 12 common macroalgae species from Azores were investigated for their potential angiotensinconverting enzyme (ACE) inhibitory properties. After optimization of enzymatic hydrolysis conditions, the anti-ACE activity was determined by high performance liquid chromatography (HPLC). The species under study include four Rhodophyta (Gelidium microdon, Osmundea pinnatifida, Porphyra sp. and Pterocladiella capillacea), four Chlorophyta (Chaetomorpha linum, Codium adhaerens, Ulva compressa and Ulva rigida) and four Heterokontophyta (Cystoseira humilis, Fucus spiralis, Padina pavonica and Sargassum cymosum). The bromelain hydrolysates derived from P. capillacea, Porphyra sp., F. spiralis, U. compressa, O. pinnatifida and U....

  15. The crustose red algal genus Peyssonnelia (Peyssonneliales, Rhodophyta) in the Azores : from five to one species

    Gabriel, Daniela; Schmidt, W. E.; Krayesky, D. M.; Harris, D. J.; Fredericq, Suzanne
    The family Peyssonneliaceae comprises a worldwide group of non-calcified to calcified, crust-forming red algae of great ecological significance. Of the genera currently recognized in the family, Peyssonnelia has been widely considered to contain the largest number of species, with five members reported for the Azores. Using rbcL as a molecular marker, we here report on the taxonomic identity of recent collections of Peyssonneliaceae from the Azorean islands of São Miguel, Graciosa and Pico, and compare those specimens in a worldwide context. Only a single Peyssonnelia species, P. squamaria, is confirmed for the Azorean archipelago, with three different haplotypes. Although the...

  16. A sea urchin (Diadema africanum Rodriguez et al., 2013) and a pipe fish (Syngnathus phlegon Risso, 1827) : two new records for the Azores

    Minderlein, Robert; Wirtz, Peter
    Maciel & Costa (2010) reported the presence of 17 species of costal sea urchins (Echinoidea) in the Azores, while Porteiro et al. (2010) reported six species of pipefishes (Syngnathidae) for the area. During SCUBA diving at Santa Maria Island, the first author detected a sea urchin and a pipe fish which are new to the marine fauna of the Azores.

  17. New data on hoverflies (Diptera: Syrphidae) from the Azorean island Pico (Portugal)

    Jentzsch, Matthias
    The hoverfly fauna of the Azores currently comprises 23 species (Smit 2010), but the current state of knowledge concerning these species differs for each island. In the year 1938, R. Frey and R. Storå recorded the first seven hoverfly species on Pico Island (Frey 1945), and these very same ones were still mentioned by Rojo et al. (1997). Smit (2010) added one more species to this list (Table 1). In the summer of 2014, the author of this article sampled hoverflies on Pico Island in several habitats. In this paper, the results will be presented.

  18. Seven invertebrates new for the marine fauna of Madeira Archipelago

    Wirtz, Peter
    Ocaña and den Hartog (2002) recorded 18 species of sea anemones from Madeira archipelago. During SCUBA dives along the coasts of Madeira and Porto Santo, the present author encountered a further three sea anemone species and several other marine invertebrates not yet recorded for the marine fauna of Madeira Island. Similar to previous publications (e.g. Wirtz 1998, Wirtz 2007, Ocaña & Wirtz 2009), these findings are reported here.

  19. Long-term monitoring across elevational gradients to assess ecological hypothesis : a description of standardized sampling methods in oceanic islands and first results

    Gabriel, Rosalina; Coelho, Márcia M. C.; Henriques, Débora; Borges, Paulo A. V.; Elias, Rui B.; Kluge, Jürgen; Ah-Peng, Claudine
    We are launching a long-term study to characterize the biodiversity at different elevations in several Azorean Islands. Our aim is to use the Azores as a model archipelago to answer the fundamental question of what generates and maintains the global spatial heterogeneity of diversity in islands and to be able to understand the dynamics of change across time. An extensive, standardized sampling protocol was applied in most of the remnant forest fragments of five Azorean Islands. Fieldwork followed BRYOLAT methodology for the collection of bryophytes, ferns and other vascular plant species. A modified version of the BALA protocol was used...

  20. Efficiency of sampling methods and effort to assess arthropod diversity in Azorean native forests

    Gaspar, Clara; Cardoso, Pedro; Borges, Paulo A. V.; Gaston, Kevin J.
    The BALA project (Biodiversity of Arthropods of Laurisilva of the Azores) is a research initiative to quantify the spatial distribution of arthropod biodiversity in native forests of the Azores archipelago. Arthropods were collected using a combination of two techniques, targeting epigean (ground dwelling) and canopy (arboreal) arthropods: pitfall traps (with Turquin and Ethylene solutions) and beating samples (using the three most dominant plant species). A total of 109 transects distributed amongst 18 forest fragments in seven of the nine Azorean islands were used in this study. The performance of alternative sampling methods and effort were tested. No significant differences were...

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