Mostrando recursos 1 - 8 de 8

  1. Long-term monitoring across elevational gradients (III) : vascular plants on Terceira Island (Azores) transect

    Henriques, Débora; Elias, Rui B.; Coelho, Márcia Catarina Mendes; Hernandéz, R. H.; Pereira, Fernando E. A.; Gabriel, Rosalina
    Anthropogenic disturbance often drives habitat loss, ecological fragmentation and a decrease in biodiversity. This is especially problematic in islands, which are bounded and isolated systems. In the Azores, human settlement led to a significant contraction of the archipelago’s original native forested areas, which nowadays occupy only small patches and are additionally threatened by the spread of invasive species. Focusing on Terceira Island, this study aimed to assess the composition of vascular plant communities, and the abundance and distribution patterns of vascular plant species in permanent 100 m2 plots set up in the best preserved vegetation patches along an elevational gradient...

  2. Living inside termites : an overview of symbiotic interactions, with emphasis on flagellate protists

    Duarte, Sónia; Nunes, Lina; Borges, Paulo A. V.; Fossdal, Carl G.; Nobre, Tânia
    To degrade lignocellulose efficiently, lower termites rely on their digestive tract’s specific features (i.e., physiological properties and enzymes) and on the network of symbiotic fauna harboured in their hindgut. This complex ecosystem, has different levels of symbiosis, and is a result of diverse co-evolutionary events and the singular social behaviour of termites. The partnership between termites and flagellate protists, together with prokaryotes, has been very successful because of their co-adaptative ability and efficacy in resolving the needs of the involved organisms: this tripartite symbiosis may have reached a physiologically stable, though dynamic, evolutionary equilibrium. The diversity of flagellate protists fauna...

  3. New records of Cephalopods from Ascension Island (central Atlantic) found in yellowfin tuna stomachs

    Downes, Katie; Savage, J.A.K.; Brickle, Paul
    The squid Hyaloteuthis pelagica (Bosc, 1802) and the octopus, Ocythoe tuberculate Rafinesque, 1814 have been recorded from Ascension Island for the first time. Both species were found in yellowfin tuna stomachs caught from inshore coastal waters (within 5 km). The specimens were in good condition with distinguishing features still apparent, signifying very recent ingestion. Morphological features were examined, photographs taken and specimens stored for use as part of an on-going study investigating dietary habits of yellowfin tuna.

  4. One fish and seven invertebrate species new for the marine fauna of Cape Verde Islands

    Wirtz, Peter; Oliveira, Emanuel; Bachschmid, Georg
    The sea anemone Alicia mirabilis, the opisthobranch gastropods Tethys fimbria, Scyllaea pelagica, the shrimps Alpheus crockeri, Lysmata moorei and Processa macrophthalma, the antennariid fish Histrio histrio, and an undetermined arminacean are recorded from the Cape Verde Islands for the first time. The presence of the parasitic gastropod Echineulima leucophaes is confirmed.

  5. First record of an adult Taningia danae (Cephalopoda: Octopoteuthidae) in the Canary Islands (central-east Atlantic)

    Escánez, Alejandro; Perales-Raya, Catalina
    Remains of an adult specimen of the poorly known oceanic cephalopod, Taningia danae Joubin, 1931 were found floating in the south-western waters of Tenerife. Here we report for the first time an adult stage of the species in the Canary Islands. The remains, with a total weight of 21.169 kg, presumably belonged to a large adult female given the presence of spermatangia implanted intramuscularly in the ventral side of the mantle. This study confirms the presence of all life stages of the species in the Canary Islands.

  6. Arthropod diversity patterns in three coastal marshes in Terceira Island (Azores)

    Borges, Paulo A. V.; Pimentel, C.; Brito, Mariana dos Reis; Borda-de-Água, Luís; Gabriel, Rosalina
    The coastal wet areas of Praia da Vitória (Terceira, Azores) were investigated to describe the ground and aerial (herbaceous and canopy) arthropod communities by comparing patterns of species composition, abundance and diversity. Three wet areas were studied: Paul da Praia da Vitória (PPV), Paul do Belo Jardim (PBJ) and Paul da Pedreira do Cabo da Praia (PPCP). A standardized protocol (based on the COBRA protocol) was performed with day and night sampling of arthropods with a total of 56 samples per site. Common diversity metrics (Hill series) were calculated and abundance patterns were investigated using species abundance distributions (SAD). All...

  7. Area prioritization for insect pollinator communities on an oceanic island

    Picanço, Ana; Rigal, François; Borges, Paulo A. V.
    Conservation studies usually assess the effectiveness of protected areas and draft proposals on the inclusion of new areas to gain legal protection status, paying little attention to the unprotected surrounding matrix of the respective protected areas network. By combining species distribution modeling and a site selection method, we aim to quantify the contribution of different land uses to insect pollinator conservation on a small oceanic island i.e. Terceira Island (Azores, Portugal). Our results showed that, in addition to well preserved and protected native forest in Terceira, other land uses, such as naturalized vegetation areas, exotic forests, and semi-natural pastures, could...

  8. Seasonal dynamics of arthropods in the humid native forests of Terceira Island (Azores)

    Borges, Paulo A. V.; Pimentel, Reinaldo M. S.; Carvalho, Rui; Nunes, Rui; Wallon, Sophie; Ros-Prieto, A.
    This work aims to provide a first detailed description of the results obtained in a seasonal abundance study of arthropods in the native pristine humid forest from Terceira Island (Azores). Ten sites were sampled during four years with SLAM (Sea, Land, and Air Malaise) traps targeting several arthropod taxa with good dispersal abilities as well as epigean species crawling into the trap. Samples were taken every three months in nine sites between 2012 and 2016 and monthly in one of the sites between 2014 and 2015. A total of 147 arthropod species and morphospecies were sampled mostly belonging to Hemiptera,...

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