Recursos de colección

Repositorio da Universidade dos Açores (8.996 recursos)

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

DCA - Artigos em Revistas Internacionais / Articles in International Journals

Mostrando recursos 1 - 20 de 90

  1. The biodiversity of terrestrial arthropods in Azores

    Rego, Carla; Boieiro, Mário; Vieira, Virgílio; Borges, Paulo A. V.
    […]. El Departamento de Biología de la Universidad de las Azores organizó un total de 15 expediciones científicas en el periodo 1977-2011, que dieron lugar a varias publicaciones incluyendo muchas sobre los Lepidoptera del archipiélago (Carneiro, 1982; Carvalho, 1982, 1984, 1992; Guimarães, 1982; Sousa, 1982, 1985a, b, 1991, 1999; Meyer, 1991a, b; Vieira & Pintureau, 1991, 1993; Henderickx, 1995; Vieira, 1997, 2003, 2009; Carvalho et al., 1999; Tennent & Sousa, 2003; Vieira et al., 2003a; Karsholt & Vieira, 2005; Vieira & Karsholt, 2010). Desde 1975 a 1990, se realizaron estudios autoecológicos centrados en plagas agrícolas y sus parásitos, tales como Mythimna...

  2. The biodiversity of terrestrial arthropods in Madeira and Selvagens archipelagos

    Boieiro, Mário; Aguiar, António F.; Rego, Carla; Borges, Paulo A. V.; Serrano, Artur R. M.
    […]. El número de taxones de artrópodos terrestres citado de los archipiélagos de Madeira y Salvajes es respectivamente 3.801 y 201, entre los que hay un número significativo de endemismos (Borges et al., 2008b) (ver Tabla I; Fig. 5; Lámina II). Madeira, la isla más grande, con una orografía compleja y con el número mayor de diferentes tipos de hábitat, destaca claramente sobre las otras islas de los dos archipiélagos tanto en la riqueza de especies como en el número de taxones endémicos. Sin embargo, también se debe tener en cuenta que la biodiversidad de Madeira se ha estudiado más...

  3. Sympherobius Banks, 1904, a new hemerobid genus for the Azorean archipelago (Neuroptera: Hemerobiidae)

    Letardi, Agostino; Ponte, Nuno B.; Borges, Paulo A. V.
    É apresentado nesta nota o primeiro registo do género Sympherobius Banks, 1904 (Neuroptera: Hemerobiidae) para os Açores. A fauna de Neuroptera dos Açores é agora composta por oito espécies, cinco géneros e duas famílias.

  4. Calling for a new strategy to measure environmental (habitat) diversity in Island Biogeography : a case study of Mediterranean tenebrionids (Coleoptera, Tenebrionidae)

    Fattorini, Simone; Dapporto, Leonardo; Strona, Giovanni; Borges, Paulo A. V.
    Many recent researches in island biogeography attempted to disentangle the effects of area per se and "habitat diversity" on species richness. However, the expression "habitat diversity" in this context should be avoided, because habitats can be only recognized by referring to the resources needed by a particular species. What is really measured in such researches is some form of “environmental heterogeneity”. Although habitat heterogeneity can be measured in various ways, most researches in island biogeography simply used the number of biotopes (typically classified as land cover categories). However, not all biotopes have the same surface.On the basis of the area...

  5. Drivers of extinction : the case of Azorean beetles

    Terzopoulou, Sofia; Rigal, François; Whittaker, Robert J.; Borges, Paulo A. V.; Triantis, Kostas A.
    Oceanic islands host a disproportionately high fraction of endangered or recently extinct endemic species. We report on species extinctions among endemic Azorean beetles following 97% habitat loss since AD 1440. We infer extinctions from historical and contemporary records and examine the influence of three predictors: geographical range, habitat specialization and body size. Of 55 endemic beetle species investigated (out of 63), seven can be considered extinct. Single-island endemics (SIEs) were more prone to extinction than multi-island endemics. Within SIEs restricted to native habitat, larger species were more extinction-prone. We thus show a hierarchical path to extinction in Azorean beetles: species...

  6. The colonisation of exotic species does not have to trigger faunal homogenisation : lessons from the assembly patterns of arthropods on oceanic islands

    Florencio, Margarita; Lobo, Jorge M.; Cardoso, Pedro; Almeida-Neto, Mário; Borges, Paulo A. V.
    Human-caused disturbances can lead to the extinction of indigenous (endemic and native) species, while facilitating and increasing the colonisation of exotic species; this increase can, in turn, promote the similarity of species compositions between sites if human-disturbed sites are consistently invaded by a regionally species-poor pool of exotic species. In this study, we analysed the extent to which epigean arthropod assemblages of four islands of the Azorean archipelago are characterised by nestedness according to a habitat-altered gradient. The degree of nestedness represents the extent to which less ubiquitous species occur in subsets of sites occupied by the more widespread species,...

  7. The iterative process of plant species inventorying for obtaining reliable biodiversity patterns

    Aranda, Silvia C.; Hespanhol, Helena; Homem, Nídia; Borges, Paulo A. V.; Lobo, Jorge M.; Gabriel, Rosalina
    We require representative data of species occurrence to explain plant diversity patterns, but most of the available information is incomplete and biased. To improve our knowledge, we suggest that species inventorying should be an iterative process encompassing the following: (1) the detection of taxonomic and geographical gaps; (2) the planning of a survey design to reduce such gaps; and (3) the evaluation of field sampling results. Here, we focus on the latter phase for the bryophytes of Terceira Island (Azores) for which we have previously estimated < 1% of the area as well surveyed based on historical collections. To examine the...

  8. Climatology and atmospheric chemistry of the non-methane hydrocarbons ethane and propane over the North Atlantic

    Helmig, Detlev; Muñoz, Mauricio; Hueber, Jacques; Mazzoleni, Claudio; Mazzoleni, Lynn R.; Owen, Richard C.; Val-Martin, Maria; Fialho, Paulo; Plass-Duelmer, Christian; Palmer, Paul I.; Lewis, Alastair C.; Pfister, Gabriele
    A record spanning ten years of non-methane hydrocarbon (NMHC) data from the Pico Mountain Observatory (PMO), Pico Island, Azores, Portugal, was analyzed for seasonal NMHC behavior, atmospheric processing, and trends, focusing on ethane and propane. The location of this site in the central North Atlantic, at an elevation of 2225 m asl, allows these data to be used to investigate the background conditions and pollution transport events occurring in the lower free North Atlantic troposphere. The quantity ln([propane]/[ethane]) was used as an indicator of both photochemical processing and a marker for the occurrence of pollution transport events detected at the...

  9. Climatology and atmospheric chemistry of the non-methane hydrocarbons ethane and propane over the North Atlantic

    Helmig, Detlev; Muñoz, Mauricio; Hueber, Jacques; Mazzoleni, Claudio; Mazzoleni, Lynn R.; Owen, Richard C.; Val-Martin, Maria; Fialho, Paulo; Plass-Duelmer, Christian; Palmer, Paul I.; Lewis, Alastair C.; Pfister, Gabriele
    A record spanning ten years of non-methane hydrocarbon (NMHC) data from the Pico Mountain Observatory (PMO), Pico Island, Azores, Portugal, was analyzed for seasonal NMHC behavior, atmospheric processing, and trends, focusing on ethane and propane. The location of this site in the central North Atlantic, at an elevation of 2225 m asl, allows these data to be used to investigate the background conditions and pollution transport events occurring in the lower free North Atlantic troposphere. The quantity ln([propane]/[ethane]) was used as an indicator of both photochemical processing and a marker for the occurrence of pollution transport events detected at the...

  10. Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with a long-range transported biomass burning plume

    Dzepina, Katja; Mazzoleni, Claudio; Fialho, Paulo; China, Swarup; Zhang, Bo; Owen, R. Chris; Helmig, Detlev; Hueber, Jacques; Kumar, Sumit; Perlinger, Judith A.; Kramer, Louisa; Dziobak, Michael P.; Ampadu, Marian T.; Olsen, Seth C.; Wuebbles, Donald J.; Mazzoleni, Lynn R.
    Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m above mean sea level on Pico Island of the Azores archipelago in the North Atlantic. The observatory is located ~ 3900 km east and downwind of North America, which enables studies of free tropospheric air transported over long distances. Aerosol samples collected on filters from June to October 2012 were analyzed to characterize organic carbon, elemental carbon, and inorganic ions. The average ambient concentration of aerosol was 0.9 ± 0.7 μg m−3. On average, organic aerosol components represent the largest mass fraction of the total measured...

  11. Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with a long-range transported biomass burning plume

    Dzepina, Katja; Mazzoleni, Claudio; Fialho, Paulo; China, Swarup; Zhang, Bo; Owen, R. Chris; Helmig, Detlev; Hueber, Jacques; Kumar, Sumit; Perlinger, Judith A.; Kramer, Louisa; Dziobak, Michael P.; Ampadu, Marian T.; Olsen, Seth C.; Wuebbles, Donald J.; Mazzoleni, Lynn R.
    Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m above mean sea level on Pico Island of the Azores archipelago in the North Atlantic. The observatory is located ~ 3900 km east and downwind of North America, which enables studies of free tropospheric air transported over long distances. Aerosol samples collected on filters from June to October 2012 were analyzed to characterize organic carbon, elemental carbon, and inorganic ions. The average ambient concentration of aerosol was 0.9 ± 0.7 μg m−3. On average, organic aerosol components represent the largest mass fraction of the total measured...

  12. Morphology and Mixing State of Aged Soot Particles at a Remote Marine Free Troposphere Site : Implications for Optical Properties

    China, Swarup; Scarnato, Barbara; Owen, Robert C.; Zhang, Bo; Ampadu, Marian T.; Kumar, Sumit; Dzepina, Katja; Dziobak, Michael P.; Fialho, Paulo; Perlinger, Judith A.; Hueber, Jacques; Helmig, Detlev; Mazzoleni, Lynn R.; Mazzoleni, Claudio
    The radiative properties of soot particles depend on their morphology and mixing state, but their evolution during transport is still elusive. Here we report observations from an electron microscopy analysis of individual particles transported in the free troposphere over long distances to the remote Pico Mountain Observatory in the Azores in the North Atlantic. Approximately 70% of the soot particles were highly compact and of those 26% were thinly coated. Discrete dipole approximation simulations indicate that this compaction results in an increase in soot single scattering albedo by a factor of ≤2.17. The top of the atmosphere direct radiative forcing...

  13. Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with long range transported biomass burning plumes

    Dzepina, Katja; Mazzoleni, Claudio; Fialho, Paulo; China, Swarup; Zhang, Bo; Owen, R. Chris; Helmig, Detlev; Hueber, Jacques; Kumar, Sumit; Perlinger, Judith A.; Kramer, Louisa; Dziobak, Michael P.; Ampadu, Marian T.; Olsen, Seth C.; Wuebbles, Donald J.; Mazzoleni, Lynn R.
    Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m above mean sea level on Pico Island of the Azores archipelago in the North Atlantic. The observatory is located ~ 3900 km east and downwind of North America, which enables studies of free tropospheric air transported over long distances. Aerosol samples collected on filters from June to October 2012 were analyzed to characterize organic carbon, elemental carbon, and inorganic ions. The average ambient concentration of aerosol was 0.9 ± 0.7 μg m−3. On average, organic aerosol components represent the largest mass fraction of the total measured...

  14. Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with long range transported biomass burning plumes

    Dzepina, Katja; Mazzoleni, Claudio; Fialho, Paulo; China, Swarup; Zhang, Bo; Owen, R. Chris; Helmig, Detlev; Hueber, Jacques; Kumar, Sumit; Perlinger, Judith A.; Kramer, Louisa; Dziobak, Michael P.; Ampadu, Marian T.; Olsen, Seth C.; Wuebbles, Donald J.; Mazzoleni, Lynn R.
    Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m above mean sea level on Pico Island of the Azores archipelago in the North Atlantic. The observatory is located ~ 3900 km east and downwind of North America, which enables studies of free tropospheric air transported over long distances. Aerosol samples collected on filters from June to October 2012 were analyzed to characterize organic carbon, elemental carbon, and inorganic ions. The average ambient concentration of aerosol was 0.9 ± 0.7 μg m−3. On average, organic aerosol components represent the largest mass fraction of the total measured...

  15. The application of a multi-wavelength Aethalometer to estimate iron dust and black carbon concentrations in the marine boundary layer of Cape Verde

    Fialho, Paulo; Cerqueira, Mário; Pio, Casimiro; Cardoso, João; Nunes, Teresa; Custódio, Danilo; Alves, Célia A.; Almeida, S. M.; Almeida-Silva, M.; Reis, M. A.; Rocha, F.
    The two-component model (Fialho et al., 2006) was used to decouple the contributions of black carbon (BC) and iron oxides, present in dust, to the aerosol attenuation coefficient, measured with a multiwavelength Aethalometer. The model results were compared with the elemental carbon (EC) and iron concentrations determined in the laboratory from the analysis of aerosol particles collected with conventional samplers. The comparison was based on one year of data obtained at Praia, Santiago Island, Cape Verde, after side by side operation of the aerosol monitoring instruments. The linear regression equation that best describes the relationship between BC concentrations, derived from...

  16. Wet deposition of particulate carbon to the Central North Atlantic Ocean

    Custódio, Danilo; Cerqueira, Mário; Fialho, Paulo; Nunes, Teresa; Pio, Casimiro; Henriques, Diamantino
    Elemental carbon (EC) and water-insoluble organic carbon (WIOC) concentrations were measured in wet-only precipitation samples collected on Terceira Island (Azores, Portugal) between December 2009 and October 2010, to investigate temporal variations, source regions and wet deposition fluxes. The global volume-weighted average (vwa) concentrations were 134 ± 19 μgC L(-1) for WIOC and 15.0 ± 1.6 μgC L(-1) for EC, which fall within the range of values that have been found in the European background atmosphere. The WIOC concentration exhibited a temporal variation over the study period with a minimum in winter (vwa 88 ± 16 μgC L(-1)) and a maximum...

  17. Are underwater archaeological parks good for fishes? Symbiotic relation between cultural heritage preservation and marine conservation in the Azores

    Garcia, Catarina; Barreiros, João P.
    The Underwater Archaeological Parks (UAP) of the Azores are a cultural heritage protection initiative and an opportunity to promote fruition between archaeological sites and biodiversity. Respecting UNESCO’s “Convention on the Protection of the Underwater Cultural Heritage” principles, the UAPs were classified for the first time in 2005 and are unique in the Portuguese context. Due to the autonomy that this ultra-peripheral European Region has in terms of cultural heritage management, this structure arises from a specific law in 2005 formulated by initiative of the Azores Regional Government. At the same time, the archipelago’s marine biodiversity richness has become one of...

  18. New insights into the systematics of North Atlantic Gaidropsarus (Gadiformes, Gadidae): flagging synonymies and hidden diversity

    Barros-García, David; Bañón, Rafael; Arronte, Juan Carlos; Fernández-Peralta, Lourdes; García, Ramón; Iglésias, Samuel Paco; Sellos, Daniel Y.; Barreiros, João P.; Comesaña, Ángel Sebastián; De Carlos, Alejandro
    Gaidropsarus Rafinesque, 1810 is a genus of marine fishes, commonly known as rocklings, comprising 14 living species and showing a high ecological diversity from the intertidal zone to the deep sea. The systematics of this group has been controversial due to a general lack of representative specimens and the conservative morphology exhibited. A multidisciplinary approach combining the analysis of meristic data and the DNA barcode standard was applied in a species delimitation approach. Individuals representing eight valid and three unnamed species were collected, morphologically identified and archived in several museum collections. Comparison of DNA sequences shows complex results, furthering the...

  19. New insights into the systematics of North Atlantic Gaidropsarus (Gadiformes, Gadidae): flagging synonymies and hidden diversity

    Barros-García, David; Bañón, Rafael; Arronte, Juan Carlos; Fernández-Peralta, Lourdes; García, Ramón; Iglésias, Samuel Paco; Sellos, Daniel Y.; Barreiros, João P.; Comesaña, Ángel Sebastián; De Carlos, Alejandro
    Gaidropsarus Rafinesque, 1810 is a genus of marine fishes, commonly known as rocklings, comprising 14 living species and showing a high ecological diversity from the intertidal zone to the deep sea. The systematics of this group has been controversial due to a general lack of representative specimens and the conservative morphology exhibited. A multidisciplinary approach combining the analysis of meristic data and the DNA barcode standard was applied in a species delimitation approach. Individuals representing eight valid and three unnamed species were collected, morphologically identified and archived in several museum collections. Comparison of DNA sequences shows complex results, furthering the...

  20. First record of the cubera snapper, Lutjanus cyanopterus (Actinopterygii: Perciformes: Lutjanidae), from the Azores (NE Atlantic) and possible extension range for the West Atlantic

    Ribeiro, Pedro; Gonçalves, João M.; Chavan, Govindraj; Fricke, Ronald; García-Mederos, Antonio M.; Tuset, Victor; Barreiros, João P.
    BACKGROUND. A lutjanid recently captured in Flores Island represents the first documented record of a snapper for the Azores Islands. Since this specimen was not made available to us besides photographs and a muscle sample, a genetic study approach was necessary in order to accurately describe and discuss this somewhat unexpected occurrence. The main objective of this paper was to explain and discuss the presence of this single specimen in this part of the north-eastern Atlantic. MATERIALS AND METHODS. The specimen was caught by spear fishers on 30 July 2014 off Flores Island. We analysed all available photographs and a sample...

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