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ARQ - LMS - Número 21A

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http://hdl.handle.net/10400.3/136

Artigos publicados no Número 21A - 2004

CONTENTS:

Lafon V., A. Martins, M. Figueiredo, M.A. Melo Rodrigues, I. Bashmachnikov, A. Mendonça, L. Macedo & N. Goulart. - Sea surface temperature distribution in the Azores region. Part I: AVHRR imagery and in situ data processing.

Bashmachnikov, I., V. Lafon & A. Martins. - Sea surface temperature distribution in the Azores region. Part II: space-time variability and underlying mechanisms.

Vieira, V., L. Oliveira, P. Garcia & J. Tavares. - Assessment of Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae) populations in Azorean pastures by light and pheromone traps.

Machado, P.B., M.R. Pinho & P.N. Duarte. - Trends in the fishery and catch patterns of kitefin shark, Dalatias licha (Bonaterre, 1788), from off Azores, through a GIS spatial analysis.

Menezes, G.M., O. Tariche, M.R. Pinho, P.N. Duarte, A. Fernandes, M.A. Aboim. - Annotated list of fishes caught by the R/V ARQUIPÉLAGO off the Cape Verde archipelago.

SHORT COMMUNICATIONS:

Rodrigues, A.F., A. Aptroot, M.C. Freitas, E. Sousa, C. Rodrigues, A.S. Amaral, B. Vieira & P. Soares. - Additions to the lichen flora found on Cryptomeria japonica D. Don, in the Azores.

Ávila, S.P., F. Cardigos & R.S. Santos. - D. João de Castro Bank, a shallow water hydrothermal-vent in the Azores: checklist of the marine molluscs.

Wirtz, P. - A note on nudibranchs (Mollusca Opisthobranchia) from Príncipe Island (eastern central Atlantic).

Wirtz, P. - Four amphi-Atlantic shrimps new for São Tomé and Príncipe (eastern central Atlantic).

Garrido, M. J., M. Hernández, F. Espino, R. Herrera & O. Tavío. - Hacelia superba H. L. Clark, 1921 and Chaetaster longipes Retzius, 1805 (Echinodermata: Echinodeca) new records for Canary islands.

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  • Hacelia superba H. L. Clark, 1921 and Chaetaster longipes Retzius, 1805 (Echinodermata: Echinodea) new records for Canary islands.
    Publication . Garrido, M. J.; Hernández, M.; Espino, F.; Herrera, R.; Tavío, O.
    During the 2003 SEGA expeditions one individual of Chaetaster longipes Retzius, 1805 was found at 40 meters depth by a SCUBA diver at Los Islotes (North Lanzarote), and two individuals of Hacelia superba Clark, 1921 were caught respectively by a circular wire fish trap and by dredging northeast of Gran Canaria. These are first records for the infralittoral and circumlittoral zones of the Canary Islands.
    2004Journal article Open access Show more
  • Four amphi-Atlantic shrimps new for São Tomé and Príncipe (eastern central Atlantic).
    Publication . Wirtz, Peter
    The shrimps Thor amboinensis, Lysmata grabhami, Tuleariocaris neglecta, and Janicea antiguensis are recorded from São Tomé and Príncipe for the first time.
    2004Journal article Open access Show more
  • A note on nudibranchs (Mollusca Opisthobranchia) from Príncipe Island (eastern central Atlantic).
    Publication . Wirtz, Peter
    The nudibranchs Hypselodoris picta verdensis, Platydoris rolani, Glossodoris edmundsi, Flabellina arveleoi, and Flabellina llerae were recorded during an expedition to Príncipe island, the last three species being new records for the area.
    2004Journal article Open access Show more
  • D. João de Castro Bank, a shallow water hydrothermal-vent in the Azores: checklist of the marine molluscs.
    Publication . Ávila, Sérgio P.; Cardigos, Frederico; Santos, Ricardo S.
    D. João de Castro Bank (DJC) is a shallow seamount with hydrothermal activity located between the islands of Terceira and São Miguel, Azores (Portugal). Due to its remote location, few investigators have worked in the area. Thirty-three species of marine molluscs are recorded as new for DJC which brings the total number of species to 42 for this specific area. Common micro-mollusc species known for the Azores (e.g.: the sublittoral species Alvania poucheti and Setia subvaricosa) are not present, and possible reasons for this are discussed.
    2004Journal article Open access Show more
  • Additions to the lichen flora found on Cryptomeria japonica D. Don, in the Azores.
    Publication . Rodrigues, António F.; Aptroot, André; Freitas, Maria do Carmo; Sousa, Eva; Rodrigues, Carla; Amaral, Ana Sofia; Vieira, Bruno; Soares, Paula
    Twenty-nine lichens species were reported in samples from Azorean Cryptomeria japonica forests. One species, Ramalina peruviana Ach., is newly recorded for the Macaronesian Region. On Cryptomeria japonica, seven new lichen records were found for the Azores: Parmotrema bangii (Vain.) Hale, Pyrrospora quernea (Dickson) Körber, Pyxine subcinerea Stirt., Ramalina implectens Nyl., Ramalina peruviana Ach., Usnea dasaea Stirton and Usnea esperantiana P. Clerc.The species Ramalina peruviana Ach., is rare within the Macaronesian Region.
    2004Journal article Open access Show more
  • Annotated list of fishes caught by the R/V ARQUIPÉLAGO off the Cape Verde archipelago.
    Publication . Menezes, Gui M.; Tariche, Oksana; Pinho, Mário Rui; Duarte, Pedro N.; Fernandes, Ana; Aboim, Maria A.
    A prospective survey was carried out in October - November of 2000, in the Cape Verde archipelago, by the R/V ARQUIPÉLAGO. The main objective was to determine the species composition and relative abundance of the demersal fish resources living in the waters of the Cape Verde archipelago. A list of fishes caught with bottom longline during the survey is presented in this document, along with information about the area, depth limits and the relative abundance of the species in the catches. Ninety-seven different species from 49 families were identified from 20 long-line sets. To our knowledge, the following 12 species were recorded for the first time from the waters of Cape Verde islands: Etmopterus princeps, Etmopterus pusillus, Gymnothorax maderensis, Myroconger compressus, Laemonema robustum, Beryx splendens, Scorpaena elongata, Serranus atricauda, Taractes rubescens, Taracthichthys longipinnis, Pagrus africanus and Cathidermis sufflamen. The species Laemonema robustum, were new to the CLOFETA area.
    2004Journal article Open access Show more
  • Trends in the fishery and catch patterns of kitefin shark, Dalatias licha (Bonaterre, 1788), from off Azores, through a GIS spatial analysis.
    Publication . Machado, Pedro B.; Pinho, Mário Rui; Duarte, Pedro N.
    During the last two decades the Azorean fishing community has profited from the kitefin shark fishery which in the year 2000 generated an estimated revenue of approximately €12,500. This resource has been targeted mainly by small fishing vessels operating in the Azores archipelago since the late 1970s. The vulnerability of this species to exploitation has raised the concern about the impact of the fishery on the resource. The monthly landings of three artisanal fishing vessels were monitored and possible changes to kitefin shark abundance and catch pattern, for the period between 1986 and 1998, were geographically analysed. A vector-based GIS (Geographic Information System) was constructed to evaluate the changes in the number of individuals captured and squalene oil barrels obtained through a spatio-temporal perspective. In order to investigate which were the most profitable fishing areas. An optimum fishing pathway was generated for one of the vessels in 1997 based on a raster GIS. The results indicated a decrease of kitefin shark catches in several areas around Azores archipelago and over the time period analysed. The analysis of the data in a GIS environment yield a dynamic and integrated view of the species catches off Azores in a temporal and spatial perspective.
    2004Journal article Open access Show more
  • Assessment of Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae) populations in Azorean pastures by light and pheromone traps.
    Publication . Vieira, Virgílio; Oliveira, Luísa; Garcia, Patrícia; Tavares, João
    The number of larvae and seasonal flight activity of the true armyworm, Pseudaletia unipuncta (Haworth) (Lepidoptera, Noctuidae), were monitored during three consecutive years (1992-1994) in pastures in S. Miguel island. P. unipuncta adult flight activity, monitored by light and pheromone traps, varied significantly with altitude, year or season, but was positively correlated between these two trapping systems. The adult sex ratio did not deviate significantly from 1:1. The number of adults captured influenced the performance of the two types of traps, with pheromone trap being more effective at low density of moths. Temperature affected the number of adults captured in light and pheromone traps. Consistent patterns occur year after year, especially between July and October, months with high temperatures associated with some rainfall, corresponding to conditions that are suitable for the growth of the armyworm. The highest number of adults and larvae was observed during the summer and in early autumn. The number of larvae was significantly correlated to the number of adults caught in pheromone traps and in light traps, at all the localities. The use of light and particularly pheromone traps can be very useful for monitoring the population abundance of P. unipuncta in Azorean pastures, as part of integrated pest management programs.
    2004Journal article Open access Show more
  • Sea surface temperature distribution in the Azores region. Part II: space-time variability and underlying mechanisms.
    Publication . Bashmachnikov, Igor; Lafon, Virginie; Martins, Ana
    Following the methodology described in the first part of the article, monthly Sea Surface Temperature (SST) distribution and variability in the Azores region was studied for the years 2001-2002. The mean SST field shows colder waters in the vicinity of big topographic features − near the Mid-Atlantic Ridge, between the Central and Eastern groups of the Azores islands and near the Azores and Princess Alice banks, with maximum temperature differences reaching 1ºC. Some of the anomalies can result from intensification of moving cyclonic waves/vortexes over bottom rises. The importance of wave/vortex induced heat flux from the Azores front to the Azores islands is discussed. Position of two eastward flows to the north and south of the Azores islands was investigated with the SST data. We suggest that the observed seasonal variability of the SST data greatly depends on general circulation seasonal changes in this region.
    2004Journal article Open access Show more
  • Sea surface temperature distribution in the Azores region. Part I: AVHRR imagery and in situ data processing.
    Publication . Lafon, Virginie; Martins, Ana; Figueiredo, Miguel; Rodrigues, Margarida M.; Bashmachnikov, Igor; Mendonça, Ana; Macedo, Luis; Goulart, Neri
    Sixteen months of 1.1 km resolution NOAA-12, -14, and -16 data for the Azores region are investigated. Advanced Very High Resolution Radiometer (AVHRR) derived sea surface temperature (SST) is compared to an extensive in situ temperature measurement database, mainly constituted during fisheries campaigns. This comparison shows that SST maps include numerous pixels with temperature values below the range observed for the Azores. Low temperatures are attributed in literature to pixel contamination by cloud neighbouring and these are usually removed by eroding pixels around clouds. Results of this study show that running an erosion filter removes only two thirds of the contaminated pixels. Remnant clouds are filtered inputting threshold values to SST 8-day temperature histograms. Based on a comparison of the SST values derived on an image-by-image basis, it is also demonstrated that differences among the sensors are lower than the measurement accuracy, whilst, on the contrary, nighttime and daytime SST distributions are statistically different. Based on monthly and 15-day average computations at nighttime, AVHRR-derived SST distribution in the Azores and associated dominant space and time scales are proposed in the second part of this paper (SST distribution in the Azores region. Part II: Space and time variability and its relation to North Atlantic Oscillation).
    2004Journal article Open access Show more