Mostrando recursos 1 - 8 de 8

  1. 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...

  2. 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...

  3. 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,...

  4. 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...

  5. 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...

  6. 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...

  7. 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....

  8. 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...

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