Recursos de colección

Repositorio da Universidade dos Açores (9.269 recursos)

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

ARQ - CBM - Número 26

Mostrando recursos 1 - 12 de 12

  1. Presence of fibropapillomatosis in green turtles Chelonia mydas at Príncipe Island in the Gulf of Guinea

    Loureiro, Nuno de Santos; Matos, Damião
    Fibropapillomatosis is a transmissible and life threatening disease associated with one or more herpesviruses that are afflicting sea turtles worldwide (Herbst 1994). First documented on green turtles Chelonia mydas (Quackenbush et al. 1998), since the 1990's it has been found on other species, like hawksbills Eretmochelys imbricata (D’Amato & Moraes-Neto 2000; Williams & Bunkley-Williams 1996), olive ridleys Lepidochelys olivacea (Herbst 1994), loggerheads Caretta caretta (Aguirre 1998; Harms et al. 2008), and leatherbacks Dermochelys coriacea (Huerta et al. 2000). The etiology and prevalence of fibropapillomatosis are not fully understood and further research is needed. Even so, it is accepted that pelagic juveniles are free...

  2. New occurrences of Corallium spp. (Octocorallia, Coralliidae) in the Central Northeast Atlantic

    Sampaio, Íris; Ocaña, Óscar; Tempera, Fernando; Henriques, Andreia Braga; Matos, Valentina; Porteiro, Filipe M.
    Corallium niobe Bayer, 1964 and Corallium tricolor (Johnson, 1899) are reported as new records from the central Northeast Atlantic. C. niobe was caught in the Azores and C. tricolor on the slope of the Irving Seamount (South Azores Seamounts). The presence of Corallium johnsoni Gray, 1860 in Azorean waters is confirmed. The sub-tropical Macaronesian islands and seamounts appear to be an important hot-spot for Corallium spp. Most colonies have been collected on seamounts and island slopes around Madeira, Canaries, Azores and the Cape Verde archipelagos. In the Azores most of these corals live below the normal depth of commercial fishing operations and are unlikely to...

  3. First record of the top invasive plant Leycesteria formosa (Caprifoliacea) in Terceira Island, Azores

    Silva, Luís; Marcelino, José; Resendes, Roberto; Moniz, João
    Leycesteria formosa Wallich in Roxb. (Caprifoliaceae) is considered as one of the top 100 invasive species in Macaronesia, due to the extensive infestations presently reported for São Miguel Island, where it is invading Pico da Vara/Tronqueira Special Protection Area, and Lagoa do Fogo Nature Reserve (Silva et al. 2008). It is found invading marginal areas like the margin of Cryptomeria japonica stands, but also the native forest and other types of vegetation, not only in sheltered locations (ravines and water courses) but also at highly exposed sites, (i.e. Monte Escuro). Recorded habitats include Calluna scrubland, Laurus forest, Ilex forest, Juniperus forest, pasture margins, water stream banks, ravines, roadsides, Cryptomeria production forest, and Pittosporum exotic woodland. [...]

  4. Reversion to juvenility: the use of epicormics in the micropropagation of mature wild shrubs of Vaccinium cylindraceum Smith (Ericacaeae)

    Pereira, Maria João
    An efficient in vitro method was developed to propagate the shoots of mature wild shrubs of Vaccinium cylindraceum Sm. by axillary bud proliferation on epicormic stems. In the initial culture, 46.9% of the epicormic buds produced new shoots with juvenile morphological features. The number of nodes per shoot and the shoot length for explants which originated from epicormic buds was significantly higher when compared to that of winter dormant buds but similar when compared to that of seedling buds. The three most distal buds of epicormic twigs produced the best rates of shoot initiation: 87.5% (position 1) to 62.5% (position 3).

  5. Aspects of the biology of the leaf‐scale gulper shark Centrophorus squamosus (Bonnaterre, 1788) off Madeira archipelago

    Severino, Ricardo B.; Afonso-Dias, Isabel; Delgado, João; Afonso-Dias, Manuel
    A total of 206 Centrophorus squamosus (Bonnaterre, 1788) with a total length ranging from 89 to 146 cm were captured at an average depth of 1200 metres. Of the 61 females sampled, 34% were gravid, showing an absolute individual fecundity of two to ten embryos (pups). The results clearly indicated that this deepwater shark spawns in the Portuguese waters off Madeira archipelago.

  6. Thirteen new records of marine invertebrates and two of fishes from Cape Verde Islands

    Wirtz, Peter
    The sea anemones Actinoporus elegans Duchassaing, 1850 and Anthothoe affinis (Johnson, 1861) are new records from Cape Verde Islands. Also new to the marine fauna of Cape Verde are an undescribed mysid species of the genus Heteromysis that lives in association with the polychaete Branchiomma nigromaculata, the shrimp Tulearicoaris neglecta Chace, 1969 that lives in association with the sea urchin Diadema antillarum, an undescribed nudibranch of the genus Hypselodoris, and two undescribed species of the parasitic gastropod genus Melanella and Melanella cf. eburnea. An undescribed plathelmint of the genus Pseudobiceros, the nudibranch Phyllidia flava (Aradas, 1847) and the parasitic gastropod Echineulima leucophaes (Tomlin...

  7. Ten new records of marine invertebrates from the Azores

    Wirtz, Peter
    The sea anemones Telmatactis cricoides (Duchassaign, 1850) and Actinia n. sp., the molluscs Tonna galea Linnaeus, 1758, Vitreolina philippi (de Rayneval & Ponzi, 1854), Melanella n. sp., Phidiana lynceus (de Rayneval & Ponzi, 1854) and Anomia patelliformis (Linnaeus, 1761), the nemertine Baseodiscus delineatus (DelleChiaje, 1825) and the echinoderms Leptosynapta inhaerens (O. F. Müller, 1776) and Stichopus regalis (Cuvier, 1817), are here recorded from the Azores for the first time. The presence of the two starfish species Chaetaster longipes (Retzius, 1805) and Luidia ciliaris (Philippi, 1837) in the Azores is confirmed and the spawning behaviour of the sea urchin Echinocyamus pusillus (O. F. Müller,...

  8. Acoustic tag retention of the Mediterranean slipper lobster Scyllarides latus (Latreille, 1802) in the Azores

    Schmiing, Mara; Afonso, Pedro
    Moulting, growth and retention of externally attached acoustic tags were studied in ten Mediterranean slipper lobsters, Scyllarides latus (Latreille, 1802). Animals were kept in a cage at 20 m depth in Faial Island, Azores, over a period of nine months. No negative effects of tag attachment on moult or behaviour were detected, but a negative effect on growth cannot be excluded. Moulting was correlated with ambient water temperature and resulted in an increase of approximately 7% in mean size and 17% in mean weight. The results demonstrate that the use of externally attached acoustic transmitters in this species is adequate for medium-term...

  9. The study of bacterioplankton dynamics in the Berlengas Archipelago (West coast of Portugal) by applying the HJ-biplot method

    Mendes, Susana; Fernández-Gómez, M.J.; Galindo-Villardón, M.P.; Morgado, F.; Maranhão, P.; Azeiteiro, Ulisses M.; Bacelar-Nicolau, P.
    The relationship between bacterioplankton and environmental forcing in the Berlengas Archipelago (Western Coast of Portugal) were studied between February 2006 and February 2007 in two sampling stations: Berlenga and Canal, using an HJ-biplot. The HJ-biplot showed a simultaneous display of the three main metabolic groups of bacteria involved in carbon cycling (aerobic heterotrophic bacteria, sulphate-reducing bacteria and nitrate-reducing bacteria) and environmental parameters, in low dimensions. Our results indicated that bacterial dynamics are mainly affected by temporal gradients (seasonal gradients with a clear winter versus summer opposition), and less by the spatial structure (Berlenga and Canal). The yearly variation in the abundance of aerobic heterotrophic bacteria...

  10. Benthic macroinvertebrate based indices for assessing the ecological status of freshwaters on oceanic islands

    Raposeiro, Pedro M.; Costa, Ana C.
    Following the Water Framework Directive (2000/60/EC), macroinvertebrates are required biological elements for monitoring European aquatic ecosystems. Several efforts have been made towards establishing a biomonitoring programme for the Azores freshwater systems using benthic macroinvertebrates. However, little was previously known concerning Azorean freshwater macroinvertebrate fauna. Data from a major ongoing survey of macroinvertebrate freshwater fauna for two islands are presented and the use of macroinvertebrates as water quality indicators for the Azorean streams is evaluated. The upper, middle and lower reaches of streams longer than 10 km from São Miguel (10) and Santa Maria (1) were surveyed (a total of 33 samples). A total of 21 taxa...

  11. Propagation of the endangered Azorean cherry Prunus azorica using stem cuttings and air layering

    Prunus azorica (Hort. ex Mouillef.) Rivas Mart., Lousã, Fern. Prieto, E. Dias, J.C. Costa & C. Aguiar is an endangered tree endemic to the Azores, with an ecological and ornamental interest. The objective of this study was to determine the conditions necessary for the successful propagation of P. azorica by stem cuttings and air-layering. Stem cuttings collected in March with two apical leaf pairs pruned to 1/3 of their leaf area were submitted to different treatments, including a basal split wound, two rooting mixtures, namely, perlite and peat (1:1) or perlite and natural soil (1:1), and dipping of the base in...

  12. Vegetative propagation of the Azorean endemic shrub Viburnum treleasei Gand.

    Moura, Mónica; Silva, Luís
    Viburnum treleasei Gand. is a threatened hermaphroditic shrub or small tree endemic to the Azores islands. In this study we aimed at defining a fast, simple and cost-efficient propagation methodology that could be used by non-skilled workers in conservation action plans. Our objective was also to produce cleaner material for initiation of in vitro cultures and to determine the effects of season, placement of cuttings in the branch, placement of vegetative buds in cuttings and forcing solutions in shoot development. It was possible to produce clean shoots from cuttings using a forcing solution with 8-hydroxyquinoline sulphate (8-HQS), 2% sucrose and no...

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