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Repositorio da Universidade dos Açores (8.559 recursos)

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

Departamento de Ciências Agrárias

Mostrando recursos 1 - 20 de 226

  1. Açorianos na caça às focas

    Riley, Carlos Guilherme; Barreiros, João P.
    Conhecidos pela sua destreza como arpoadores, alguns dos açorianos que integravam as tripulações das frotas baleeiras americanas estiveram também envolvidas na caça às focas, como destaca o historiador Donald Warrin num interessante estudo publicado recentemente – The Whalemen’s other bounty: Azoreans and Cape Verdeans in the hunt for Seals (2015). A caça às focas, profundamente impregnada no quotidiano e cultura do povo Inuit que habita as regiões árticas, foi uma atividade também praticada pelos baleeiros americanos que depois vendiam as peles ou o óleo extraído deste mamífero aquático. […].

  2. Açorianos na caça às focas

    Riley, Carlos Guilherme; Barreiros, João P.
    Conhecidos pela sua destreza como arpoadores, alguns dos açorianos que integravam as tripulações das frotas baleeiras americanas estiveram também envolvidas na caça às focas, como destaca o historiador Donald Warrin num interessante estudo publicado recentemente – The Whalemen’s other bounty: Azoreans and Cape Verdeans in the hunt for Seals (2015). A caça às focas, profundamente impregnada no quotidiano e cultura do povo Inuit que habita as regiões árticas, foi uma atividade também praticada pelos baleeiros americanos que depois vendiam as peles ou o óleo extraído deste mamífero aquático. […].

  3. 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...

  4. 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...

  5. Interacções entre polvos e meros : de predador nuclear a presa preferencial

    Barreiros, João P.
    Este artigo descreve estudos de caso e discute, com base em observações do autor e os escassos dados disponíveis, as interacções ontogénicas entre o polvo comum, Octopus vulgaris e o mero Epinephelus marginatus (Actinopterygii, Serranidae, Epinephelinae). Dados e observações levadas a cabo nos Açores e no Sul do Brasil permitem traçar um quadro provisório de interacções que evoluem com o processo ontogénico de ambas as espécies. Enquanto post-larvas e juvenis os meros aparentam um comportamento predatório muito generalista que incluem associações com alguns predadores nucleares entre os quais o polvocomum. Todavia, e à medida que crescem, os meros passam a...

  6. Interacções entre polvos e meros : de predador nuclear a presa preferencial

    Barreiros, João P.
    Este artigo descreve estudos de caso e discute, com base em observações do autor e os escassos dados disponíveis, as interacções ontogénicas entre o polvo comum, Octopus vulgaris e o mero Epinephelus marginatus (Actinopterygii, Serranidae, Epinephelinae). Dados e observações levadas a cabo nos Açores e no Sul do Brasil permitem traçar um quadro provisório de interacções que evoluem com o processo ontogénico de ambas as espécies. Enquanto post-larvas e juvenis os meros aparentam um comportamento predatório muito generalista que incluem associações com alguns predadores nucleares entre os quais o polvocomum. Todavia, e à medida que crescem, os meros passam a...

  7. 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...

  8. 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...

  9. Deep-sea seven-arm octopus hijacks jellyfish in shallow waters

    Rosa, Rui; Kelly, Jesse T.; Lopes, Vanessa M.; Paula, José R.; Gonçalves, João M.; Calado, Ricardo; Norman, Mark D.; Barreiros, João P.
    Pelagic octopods have secondarily left the seafloor and evolved a holopelagic existence. One of the most striking adaptations among a suite of related pelagic octopod families (superfamily Argonautoidea) is their associations with gelatinous zooplankton (jellyfishes and salps). Here, we report a unique interaction between a male octopod (Haliphron atlanticus) and a jellyfish (Pelagia noctiluca) at the sea surface. The oral-to-oral surface orientation of this encounter and sizes of the animals seem not to fit the explanations of camouflage, shelter, and/or transportation for the octopod or “weapons stealing” strategies observed to date in other pelagic octopods. While maneuvering the jelly, H....

  10. Deep-sea seven-arm octopus hijacks jellyfish in shallow waters

    Rosa, Rui; Kelly, Jesse T.; Lopes, Vanessa M.; Paula, José R.; Gonçalves, João M.; Calado, Ricardo; Norman, Mark D.; Barreiros, João P.
    Pelagic octopods have secondarily left the seafloor and evolved a holopelagic existence. One of the most striking adaptations among a suite of related pelagic octopod families (superfamily Argonautoidea) is their associations with gelatinous zooplankton (jellyfishes and salps). Here, we report a unique interaction between a male octopod (Haliphron atlanticus) and a jellyfish (Pelagia noctiluca) at the sea surface. The oral-to-oral surface orientation of this encounter and sizes of the animals seem not to fit the explanations of camouflage, shelter, and/or transportation for the octopod or “weapons stealing” strategies observed to date in other pelagic octopods. While maneuvering the jelly, H....

  11. Unusual presence of Coryphaena hippurus Linnaeus, 1758 (Perciformes: Coryphaenidae) under an offshore oil platform in Southern Brazil

    Sinopoli, Mauro; Battaglia, Pietro; Barreiros, João P.
    OBJECTIVE: To study the food habits of a sample of the dolphinfish (Coryphaena hippurus) around the Petrobrás PXIV oil platform located off Southern Brazil. Methods: We examined the stomach contents of 28 adult dolphinfish caught around this platform between 2000 and 2001. RESULTS: Results highlighted a diet consisting mainly of pelagic fish, although cephalopods and crustaceans are also present. A large amount of clupeids found in the stomachs could be due to baits used by fishermen that do fish around the platform. CONCLUSIONS: In this research we discuss the possibility of this occurrence being related to trophic opportunistic behavior. This could be...

  12. Unusual presence of Coryphaena hippurus Linnaeus, 1758 (Perciformes: Coryphaenidae) under an offshore oil platform in Southern Brazil

    Sinopoli, Mauro; Battaglia, Pietro; Barreiros, João P.
    OBJECTIVE: To study the food habits of a sample of the dolphinfish (Coryphaena hippurus) around the Petrobrás PXIV oil platform located off Southern Brazil. Methods: We examined the stomach contents of 28 adult dolphinfish caught around this platform between 2000 and 2001. RESULTS: Results highlighted a diet consisting mainly of pelagic fish, although cephalopods and crustaceans are also present. A large amount of clupeids found in the stomachs could be due to baits used by fishermen that do fish around the platform. CONCLUSIONS: In this research we discuss the possibility of this occurrence being related to trophic opportunistic behavior. This could be...

  13. Hábitos alimentares de Paralonchurus brasiliensis (Steindachner, 1875) em Penha, SC, Sul do Brasil

    Goetten, Maurício Antônio; Bosse, Afonso; Sedrez, Mário C.; Barrilli, Germano H. C.; Verani, José R.; Martins, Mariana de Oliveira; Branco, Joaquim Olinto; Barreiros, João P.
    5.º Simpósio de Integração Científica e Tecnológica do Sul Catarinense, Araranguá (SC), 19 e 20 de outubro de 2016.

  14. Hábitos alimentares de Paralonchurus brasiliensis (Steindachner, 1875) em Penha, SC, Sul do Brasil

    Goetten, Maurício Antônio; Bosse, Afonso; Sedrez, Mário C.; Barrilli, Germano H. C.; Verani, José R.; Martins, Mariana de Oliveira; Branco, Joaquim Olinto; Barreiros, João P.
    5.º Simpósio de Integração Científica e Tecnológica do Sul Catarinense, Araranguá (SC), 19 e 20 de outubro de 2016.

  15. Efeitos de impactos ambientais na mastofauna de áreas protegidas em ambiente antropizado

    Cunha, Fernanda Almeida
    Dissertação de Mestrado, Gestão e Conservação da Natureza, 21 de Abril de 2017, Universidade dos Açores.

  16. Desperdício de produtos hortofrutícolas percebido por famílias de uma freguesia citadina nos Açores

    Marinho, Maria Cristina da Silva Ribeiro
    Dissertação de Mestrado, Gestão e Conservação da Natureza, 15 de Março de 2017, Universidade dos Açores

  17. Description of an eye barotrauma in scuba diving with clinical discussion

    Barreiros, Pedro; Haddad Jr., Vidal; Barreiros, João P.
    In this paper we report and discuss a scuba diving accident caused by compression of the mask at a depth of 9.1 m resulting in conjunctiva haemorrhage of both eyes in a 21-year-old male. After five weeks and benefiting from immediate post-accident medical attention and medication followed by ophthalmologic examinations the patient recovered with no chronic effects neither in vision nor in the eyes.

  18. Differential survival and reproduction in colour forms of Philaenus spumarius give new insights to the study of its balanced polymorphism

    Silva, Sara E.; Rodrigues, Ana S. B.; Marabuto, Eduardo; Yurtsever, Selçuk; Borges, Paulo A. V.; Quartau, José A.; Paulo, Octávio S.; Seabra, Sofia G.
    1. Colour polymorphisms are common across animals and are often the result of complex selection regimes. Philaenus spumarius (Linnaeus) (Hemiptera, Aphrophoridae) shows a widely studied dorsal colour polymorphism with several described phenotypes whose variation in their occurrence and frequency, as well as their maintenance across time, have been reported. Several selective influences have been suggested to play a role, but the mechanisms underlying the maintenance of this polymorphism are still poorly understood. 2. To explore the adaptive significance of the colour polymorphism of P. spumarius, an experiment was conducted in captivity under semi-natural conditions to measure survival, reproductive success, and duration...

  19. Comparative phylogeography of endemic Azorean arthropods

    Parmakelis, Aristeidis; Rigal, François; Mourikis, Thanos; Balanika, Katerina; Terzopoulou, Sofia; Rego, Carla; Amorim, Isabel R.; Crespo, Luís C.; Pereira, Fernando E. A.; Triantis, Kostas A.; Whittaker, Robert J.; Borges, Paulo A. V.
    BACKGROUND: For a remote oceanic archipelago of up to 8 Myr age, the Azores have a comparatively low level of endemism. We present an analysis of phylogeographic patterns of endemic Azorean island arthropods aimed at testing patterns of diversification in relation to the ontogeny of the archipelago, in order to distinguish between alternative models of evolutionary dynamics on islands. We collected individuals of six species (representing Araneae, Hemiptera and Coleoptera) from 16 forest fragments from 7 islands. Using three mtDNA markers, we analysed the distribution of genetic diversity within and between islands, inferred the differentiation time-frames and investigated the inter-island...

  20. Modeling directional spatio-temporal processes in island biogeography

    Carvalho, José C.; Cardoso, Pedro; Rigal, François; Triantis, Kostas A.; Borges, Paulo A. V.
    A key challenge in island biogeography is to quantity the role of dispersal in shaping biodiversity patterns among the islands of a given archipelago. Here, we propose such a framework. Dispersal within oceanic archipelagos may be conceptualized as a spatio-temporal process dependent on: (1) the spatial distribution of islands, because the probability of successful dispersal is inversely related to the spatial distance between islands and (2) the chronological sequence of island formation that determines the directional asymmetry of dispersal (hypothesized to be predominantly from older to younger islands). From these premises, directional network models may be constructed, representing putative connections...

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