DBIO - Artigos em Revistas Nacionais / Articles in National Journals
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Browsing DBIO - Artigos em Revistas Nacionais / Articles in National Journals by Author "Ávila, Sérgio P."
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- Additions to the marine molluscs of the Formigas Islets, Azores.Publication . Ávila, Sérgio P.; Fontes, Jorge; Tempera, Fernando; Cardigos, FredericoA fauna malacológica dos ilhéus das Formigas foi abordada por Ávila & Azevedo (1997). A presente lista vem completar e corrigir aquele documento. Seis novos taxa são dados para os Açores: Vitreolina curva (Monterosato, 1874), Nassarius cf. ovoideus (Locard, 1886), Mangelia coarctata (Forbes, 1840), Raphitoma leufroyi (Michaud,1838), Coryphela sp. and Pseudochama gryphina (Lamarck, 1819). O número total de moluscos marinhos das águas pouco profundas dos ilhéus das Formigas ascende agora a 88 taxa (1 Polyplacophora, 66 Gastropoda, 20 Bivalvia e 1 Cephalopoda).
- Checklist of the Pleistocene marine molluscs of Praínha and Lagoínhas (Santa Maria Island, Azores).Publication . Ávila, Sérgio P.; Amen, Rui G.; Azevedo, José M. N.; Cachão, Mário; García-Talavera, FranciscoA critical review of the reported Pleistocene species of and Lagoinhas (Santa Maria Island, Azores) is provided, new data increasing the marine molluscan fauna to 95 taxa (80 Gastropoda and 15 Bivalvia). Six of the reported taxa are considered dubious records (5 Gastropoda, 1 Bivalvia). The stratigraphic sequence of Praia Formosa is composed of two main units, about 2-4 meters above present-day sea level. In the lower unit, Patella ulyssiponensis dominates the fossil assemblage of the basal calcareous conglomerate while Myoforceps arustatus (Dillwyn, 1817) dominates the assemblage associated to a calcareous algae mat. Above a non-depositional hiatus surface, a sandy beach deposit mainly composes the upper unit. Its fossil assemblages are dominated by large amounts of Eruilin castanea (Montagu, 1803) and, in a less extent, Lucinella diwricntn (Linnaeus, 1758) and Ensis minor (Chenu, 1843). The stratigraphic sequence of Lagoinhas, located 7.4 m above present-day sea level, is also composed of two units. A basal conglomerate is fossilized by or passes laterally to a calcareous algae mat, dominated by Myoforceps aristatus and with abundant Calliostoma pecimens. As at Prainha, these lower units are covered by a highly fossiliferous sandy bach deposit, though thinner, in which Ervlie castanea is the dominant species. Some species with Caribbean or West African affinities, the "Strombus bubonius accompanying fauna" (Garcia-Talavera, 1990), were found in the lower layers. The upper layer malacofauna is mainly related to the Mediterranean faunas, similarly to what happens nowadays (Ávila, 2000).
- Checklist of the shallow-water marine molluscs of the Azores: 1 - Pico, Faial, Flores and CorvoPublication . Ávila, Sérgio P.; Azevedo, José M. N.; Gonçalves, João M.; Fontes, Jorge; Cardigos, FredericoAn up-to-date commented check-list of the shallow-water marine molluscs of Pico, Faial, Flores and Corvo islands (Azores, Portugal) is provided, based on literature records, on material deposited at the Department of Biology of the University of the Azores (DBUA) as a result of the scientific expeditions "Flores/89", "Açores/89" and "Pico/91", and on photographic material at the Department of Oceanography and Fisheries/University of the Azores (DOP/UA). The collections of the Museu Carlos Machado - Historia Natural, MCM-HN, of the Museu de Zoologia - Museu de Historia Natural da Faculdade de Ciencias e Tecnologia da Universidade de Coimbra, MZ/MHN-FCTUC, and the mollusc collection deposited at DOP/UA were surveyed and the results are included in this report. Two hundred and fifty five taxa of shallow-water molluscs are reported to Pico, Faial, Flores and Corvo Islands (196 Gastropoda, 50 Bivalvia and 9 Cephalopoda). Of these, 32 are dubious records (23 Gastropoda, 8 Bivalvia and 1 Cephalopoda), there remaining 197 confirmed species to these islands. A total of 26 taxa were identified only down to the genus level (25 Gastropoda and 1 Bivalvia).
- Checklist of the shallow-water marine molluscs of the Azores: 2 - São Miguel Island.Publication . Ávila, Sérgio P.; Azevedo, José M. N.; Gonçalves, João M.; Fontes, José; Cardigos, FredericoThis paper provides an updated checklist of the shallow-water marine molluscs of São Miguel island, based on the data from the bibliography and in the species collected from 1989 on by the Marine Biology teams of the University of the Azores (Ponta Delgada) and of the Department of Oceanography and Fisheries (Horta). The collections of the Museu Carlos Machado - História Natural (MCM-HN), of the Museu de Zoologia - Museu de História Natural da Faculdade de Ciências e Tecnologia da Universidade de Coimbra (MZ/MHN-FCTUC) and the image bank of DOP/UA, Department of Oceanography and Fisheries of the University of the Azores (ImagDOP), were also surveyed and the results are here reported. A total of 235 taxa of shallow water marine molluscs are reported to Slo Miguel island (4 Polyplacophora, 167 Gastropoda, 61 Bivalvia and 3 Cephalopoda). Of these, 10 are dubious records (7 Gastropoda and 3 Bivalvia), there remaining 225 confirmed taxa in this island. A total of 18 taxa were identified only down to the genus level (17 Gastropoda and 1 Bivalvia). Fifteen species are cited for the first time to the Azores: Dikoleps cf. cutleriana (Clark, 1848), (Bouchet & Guillemot, 1978), Cirsotrema cochlea (Sowerby G.B. II, 1844), Opalia bellenica (Forbes, 1844), Bela laevigata (Philippi, 1836), Odostomia nitens Jeffreys, 1870, Gregariella semigranata (Reeve, 1858), Modiolus adriaticus (Lamarck, 1836), Rhomboidella prideauxi (Leach, 1815), Lima lima (Linnaeus, 1758), Kellia cf. suborbicularis (Montagu, 1803), Astarte cf. sulcata (da Costa, 1778), Tellina pygmaea Loven, 1846, Venus nux Gmelin, 1791 and Thracia papyracea (Poli, 1791).
- Fossil Whales from the AzoresPublication . Estevens, Mário; Ávila, Sérgio P.Os Açores são bem conhecidos pela sua rica fauna de cetáceos actuais. Menos conhecida, no entanto, é a ocorrência de fósseis de baleias do Neogénico superior em Santa Maria, a única ilha deste arquipélago vulcânico com registo sedimentar significativo. Este trabalho consiste numa revisão do escasso registo fóssil de cetáceos de Santa Maria, incluindo as ocorrências históricas há muito citadas na literatura, bem como outras mais recentes, ainda não publicadas. Todas as 10 ocorrências presentemente reconhecidas provêm do Complexo do Touril, uma unidade sedimentar essencialmente marinha que foi datada, no conjunto, do Messiniano-Zancliano (» 6.0-4.8 Ma). Além de alguns restos menos completos, tentativamente atribuídos apenas a Cetacea indet., os espécimes mais significativos pertencem a grupos maioritariamente pelágicos, que vivem tipicamente em águas oceânicas profundas e abertas (Mesoplodon sp. e ? Balaenopteridae indet.). Na iminência de mais descobertas, os cetáceos do Neogénico superior dos Açores podem vir a revelar-se bastante importantes no estabelecimento de correlações paleobiogeográficas no âmbito do Atlântico Norte, quer devido à localização estratégica do arquipélago quer devido à raridade, nesta região, das associações de cetáceos conhecidas deste intervalo estratigráfico.
- Illustrated checklist of the infralittoral molluscs off Vila Franca do CampoPublication . Martins, António M. de Frias; Borges, José P.; Ávila, Sérgio P.; Costa, Ana C.; Madeira, Patrícia; Morton, BrianA list of the molluscan species dredged during the 3rd International Workshop of Malacology and Marine Biology is presented. Positive identification has not been possible for a number of taxa. However, almost all species are illustrated so as to provide a practical guide to the species which may occur as beach drift and others which naturally range up into the intertidal. The distribution of the species at the various collecting stations is also presented as a table organized by depth, and identifying where specimens were collected alive or, in the case of bivalves, with both valves attached.
- Moluscos marinhos recolhidos no Banco D. João de CastroPublication . Ávila, Sérgio P.Em 31 de Dezembro de 1720, uma erupção submarina entre as ilhas de São Miguel e a Terceira originou uma ilha mais ou menos circular e com cerca de uma légua de diâmetro. A erosão marinha depressa a reduziu consideravelmente, de tal forma que em 21 de Julho de 1722 foi infornado o Conselho da Marinha Português de que a ilha tinha desaparecido (Oliveira, 1943). Após dois séculos de acesa disputa quanto à existência ou não da referida ilha ou de um baixio dela resultante, em 28 de Julho de 1941, o N.H. 'D. João de Castro' resolveu a questão, ao descobrir um baixio ao qual, de acordo com as tradições da marinha, foi dado o nome do navio. De acordo com Oliveira (1943), as agulhas rochosas do Banco 'D. João de Castro', localizado a 38° 13,5' de latitude Norte e a 26° 38,6' de longitude Oeste, possuem uma profundidade mínima de 14 m. Em 27 de Julho de 1996, numa expedição lúdico-científica organizada pelo Clube Naval de Ponta Delgada, investigadores da equipa de Biologia Marinha do Departamento de Biologia da Universidade dos Açores deslocaram-se ao referido banco, aí tendo sido efectuado um mergulho. Neste trabalho são apresentados os moluscos marinhos encontrados a uma profundidade de 30 m.
- Neogene Shallow-marine Paleoenvironments and preliminary strontium isotope chronostratigraphy of Santa Maria Islands, AzoresPublication . Kirby, Michael X.; Jones, Douglas S.; Ávila, Sérgio P.The fossils of Santa Maria Island in the Azores archipelago represent one of the few shallow-marine communities of Neogene age between Europe and North America. Before the evolutionary and biogeographic implications of these fossils can be understood, however, their associated depositional environments and geologic ages must be determined. Here we present preliminary results from sedimentary facies analysis and strontium isotope chronostratigraphic analysis of sediments and fossils from two localities on Santa Maria Island that provide a window into shallow-marine environments and communities within the mid-Atlantic Ocean during the Neogene. Pedra-que-Pica on the southeastern corner of Santa Maria contains strata of fine-grained lithic calcarenite, coquina, and fine- to medium-grained lithic wacke that represent a regressive sequence from transition-zone to foreshore environments. The second locality at Pedreira do Campo on the southwestern-side of Santa Maria contains limestone and fine- to coarse-grained lithic arenite that represent a regressive sequence from shallow bank to shoreface-foreshore environments. Strontium isotopic results from Pedra-que-Pica and Pedreira do Campo indicate that these localities contain fossils that range from late Miocene to late Pliocene in age. Three molluscs collected from the coquina at Pedra-que-Pica have an average 87Sr/86Sr composition of 0.709018±0.000008 that represents an average estimated age of 5.51±0.21 Ma. Three pectinid bivalves collected from the limestone at Pedreira do Campo show a wide range in 87Sr/86Sr ratios, from 0.708885 to 0.709078, which represent estimated ages from 10.03 to 2.24 Ma, respectively. These results help to place the shallow-marine communities of Santa Maria Island into a geologic context that will aid our understanding of how these communities relate to the broader evolutionary and biogeographic history of the Atlantic basin during the Neogene.
- Shallow-water marine molluscs of the Azores : biogeographical relationchips.Publication . Ávila, Sérgio P.Shallow-water marine molluscs of the Azores were surveyed from supralittoral to a depth of 45 m which yielded an up-to-date database. The resulting list of 231 confirmed taxa of the Azores was then compared with similar lists from Scandinavia, Belgium, British Isles. Gulf of Biscay to Galiza. Portugal, Western Mediterranean. Morocco and Mauritania, Madeira, Porto Santo, Desertas and Selvagens, Canary Islands. Cape Verde, Ascension Island? Saint Helena, and the Caribbean. A total of 18 species and 1 subspecies (Tricolia pullus azorica) are considered to be endemic to the Azores. There arc 20 new records to the Azores: Metaxia abrupta(Watson, 1880), Monophorus erythrosoma(Bouchet & Guillemot, 1978), Melanella sp., Lamellaria latens (0. F. Muller, 1776), Ranella olearia (Linnaeus, 1758), Ocinebrina edwardsi (Payraudeau, 1826), Fusinus sp., Nassarius corniculus (Olivi, 1792), Crassopleura incrassata (Dujardin, 1837). Heliacus architae (O.G. Costa, 1867), Cima cf. minima (Jeffreys, 1858). Odostomia conoidea (Brocchi, 1814), Ondina diaphana (Jeffreys, 1848), Chromodoris khroni (Verany, 1846), Chlamys flexuosa Poli. 1795, Loripes lacteus (Linnaeus, 1758). Bornia sp., Parvicardium exiguum (Gmelin, 1791), Gastrana fragilis (Linnaeus. 1758) and Praphia aurea (Gmclin, 1791). It was possible to infer the life history of only 72 species out of the 231. Of these, 38 have a free-swimming stage and 34 have a non-planktotrophic type of development (cither lecithotrotrophic or direct development). Thirteen endemic species were found with a non-planktotrophic type of development, all belonging to the Rissoidae. The Mediterranean, Madeira archipelago and Portugal mainland, are the regions which share a higher number of species with the Azores, whereas Saint Helena and Ascension Island share only a small number of species with the Azores. Some comments are made regarding the influence of the Gulf Current on the composition of the marine malacofauna of the Azores, as well on the possible routes of colonization of the Azorean islands by marine molluscs.
- Shallow-water molluscs from the Formigas islets, Azores, collected during the Santa Maria e Formigas 1990 scientific expeditionPublication . Ávila, Sérgio P.; Azevedo, José M. N.The Formigas islets are a group of rocks extended in a N-S direction, with about 165 m long by 80 m wide, located 36 km NE from Santa Maria island and 60 km SE from Sao Miguel island. The highest point,'Formigao', reaches 11 m. These islets are part of the so called Formigas Bank, an area of shallow waters with roughly 7 km long by 3 km wide, which is located between parallels 37°14'N and 37°17'N, and the meridians 24°43'W and 24°47'W (Instituto Hidrográfico, 1981; Azevedo et al., 1991) and constitutes a Natural Reserve. From 3 to 9 of August, 1990, the Marine Biology team of the Department of Biology of the University of the Azores studied the Formigas islets, during the 'Santa Maria e Formigas 1990' scientific expedition. This paper provides the list of the shallow-water molluscs collected during this expedition.