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ARQ - LMS - Número 18A

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http://hdl.handle.net/10400.3/133

Artigos publicados no Número 18A - 2001

CONTENTS:

Ribes, J. & P. Borges. - A new subspecies of Orthotylus junipericola Linnavuori, 1965 (Insecta, Heteroptera) from the Azores.

Báez, M. - The genus Sapromyza (Insecta, Diptera) in Madeira.

Neves, V.C., J.C. Fraga, H. Schäfer, V. Vieira, A. B. Sousa & P.V. Borges. - The occurrence of the Monarch butterfly, Danaus plexippus L. in the Azores, with a brief review of its biology.

Pardal, M. & U. M. Azeiteiro. - Zooplankton biomass, abundance and diversity in a shelf area of Portugal (the Berlenga Marine Natural Reserve).

Sobrinho-Gonçalves, L. & E. Isisdro. - Fish larvae and zooplankton biomass around Faial Island (Azores archipelago). A preliminary study of species occurrence and relative abundance.

Udekem d'Acoz, C. d'. - Remarks on the genera Balssia Kemp, 1922 and Acanthonyx Latreille, 1828 in the Azores, and first record of Calappa tuerkayana Pastore, 1995 (Crustacea, Decapoda) in the Atlantic Ocean.

Udekem d'Acoz, C. d', M.R. Pinho, O. Melo, J. Gonçalves & H.R. Martins. - New records and notes on little known shrimps (Crustacea, Decapoda) from Azorean waters.

Duarte, P.N., A.A. Silva, G.M. Menezes & M.R. Pinho. - Staining techniques for ageing tope shark, Galeorhinus galeus (Linnaeus, 1758), from the Azores: a comparison based on precision analysis.

Ferreira, R.L., H.R. Martins, A.A. Silva & A.B. Bolten. - Impact of swordfish fisheries on sea turtles in the Azores.

SHORT COMMUNICATIONS:

Wirtz, P. - New records of marine invertebrates from the Cape Verde Islands.

Fontes, J., F. Tempera & P. Wirtz. - On some interesting opisthobranchs (Mollusca, Gastropoda) from the Azores.

Vieira, C. M. & T. Morato. - First record of the crabs Pirimela denticulata (Montagu, 1808) and Xaiva biguttata (Risso, 1816) (Crustacea, Decapoda) from the Azores.

Bolton, M., r. Medeiros & H. Fraga. - Potential flight range of Snow Buntings Plectrophenax nivalis occurring in the Azores in late March: a first analysis.

REPUBLISHED:

Hajagos, J.G. & J.L. Van Tassell. - A visual survey of the inshore fish communities of Gran Canaria (Canary Islands).

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  • A visual survey of the inshore fish communities of Gran Canaria (Canary Islands).
    Publication . Hajagos, Janos G.; Van Tassel, James L.
    An in situ visual survey technique (5 minutes and 100 m2 area) was used to assess the inshore fishes off Gran Canaria. In 1996, 211 visual surveys were conducted at 7 localities. Locations differed significantly among each other with regards to the number of species per survey (ANOVA: p < 0.01). The five most abundant species were Chromis limbatus, Boops boops, Pomadasys incisus, Abudefduf luridus, and Thalassoma pavo with respective mean abundances of 65.6, 37.4, 16.7, 8.7, and 4.5 per 100 m2. Detrended Correspondence Analysis, a multivariate ordination technique showed that the major determinant of community structure is substrate type. The majority of the surveyed species had low axis 1 ordination scores indicating a strong association with a hard substrate. The step-wise linear regression models explained 45.3 % and 1 1.4% of the variation in the first and second axis survey ordination scores, respectively.
    2001Journal article Open access Show more
  • Potential flight range of Snow Buntings Plectrophenax nivalis occurring in the Azores in late March : a first analysis.
    Publication . Bolton, Mark; Medeiros, Renata; Fraga, Helder
    It has been known for many decades that Snow Buntings occur with some regularity in the Azores archipelago in winter, with flocks numbering up to 20 individuals on occasion. The majority of records are from the islands of Corvo and Faial. The origin and fate of these individuals is unknown and it is unclear whether the regular occurrence of such groups represents a wintering strategy, or rather, whether these birds have been blown off the course of their usual migration route. Seven individuals from a flock of ten Snow Buntings known to have been present on the island of Faial between 20th March and early May 2000 were trapped on March 30th 2000. Plumage characteristics indicated they were of the Greenland P.n. nivalis race. Measurements of body mass indicated that the fat reserves of these individuals were similar to those of Snow Buntings wintering in Scotland U.K. at the same time of year, just prior to departure to the breeding grounds. However the calculated potential flight range of the individuals from Faial varied from 500 km to 1.800 km, averaging 1.150 km for females and 1.640 km for males. Whilst these average ranges would be sufficient to make continental landfall if the birds followed an easterly route, such a heading is considered improbable, given their racial characteristics. The calculated energy reserves would be insufficient to sustain continuous flight on a northerly course to continental landfall. The presence of potentially suitable breeding habitat on the neighbouring island of Pico is highlighted.
    2001Journal article Open access Show more
  • First record of the crabs Pirimela denticulata (Montagu, 1808) and Xaiva biguttata (Risso, 1816) (Crustacea: Decapoda) from the Azores.
    Publication . Vieira, Carla M.; Morato, Telmo
    The crabs Pirimela denticulata (Montagu, 1808) and Xaiva biguttata (Risso, 1816) identified in stomach contents of striped red mullet, Mullus surmuletus (Linnaeus, 1758) are recorded for the first time in Azorean waters, extending their known distribution range. A total of 59 individuals of P. denticulata and 12 of X. biguttata were identified in 22 and 10 mullets, respectively.
    2001Journal article Open access Show more
  • On some interesting opisthobranchs (Mollusca, Gastropoda) from the Azores.
    Publication . Fontes, Jorge; Tempera, Fernando; Wirtz, Peter
    The nudibranch Eubranchus farrani Alder and Hancock, 1844 is recorded from the Azores for the first time. The presence of the sacoglossan Placida cremoniana (Trinchese, 1892) in the Azores is confirmed. Pleurobranchus sp. from the Azores, Madeira and the Canary Islands is compared with P. garciagomesi Cervera et al. 1996; it probably is an undescribed species.
    2001Journal article Open access Show more
  • New records of marine invertebrates from the Cape Verde Islands.
    Publication . Wirtz, Peter
    The anthozoan Pseudocorynactis caribbeorum den Hartog, 1980, the polychaete Lygdamis wirtzi Nishi and Núñez, 1999, the cirriped Oxynaspis celata Darwin, 1852, the cephalopod Octopus macropus (Risso, 1826), and the phoronid Phoronis australis Haswell, 1883 are recorded from the Cape Verde Islands for the first time.
    2001Journal article Open access Show more
  • Impact of swordfish fisheries on sea turtles in the Azores.
    Publication . Ferreira, Rogério L.; Martins, Helen R.; Silva, Alexandre A.; Bolten, Alan B.
    The surface longline fishery around the Azores targets swordfish (Xiphias gladius). Bycatch from this fishery includes loggerhead sea turtles (Caretta caretta) and occasionally leatherback sea turtles (Dermochelys coriacea) that are either hooked or entangled in the lines. Hooks are generally set at depths of 15-50 m and baited with squid, mackerel, or sometimes with shark meat. The size classes of loggerhead sea turtles caught ranged from 41.3 to 65.4 cm curved carapace length and constitutes the largest size class of loggerheads occurring in the Azores. The impact on this size class affects the survival of the southeastern United States (SEUS) population of loggerheads because the loggerheads from the Azores are primarily from SEUS rookeries. For one commercial longline boat, we observed that the mean capture of turtles per 1000 hooks by month ranged between a minimum of 0.04 in May and a maximum of 0.79 in July with a weighted mean catch of 0.27. October and November also registered high catch rates. Of 60 turtles recorded, 54 were hooked in the mouth, 3 in the esophagus, 1 in the eye, 1 in the flipper, and one was undetermined. The turtles that were caught were physically strong, except one that was weak and another dead. Total capture of loggerhead sea turtles is estimated to be 4190 for the entire fleet fishing in the Exclusive Economic Zone of the Azores during the swordfish season (May to December) of 1998. We strongly recommend that observer programs be continued because capture rates may vary among years and among fishing boats.
    2001Journal article Open access Show more
  • Staining techniques for ageing tope shark, Galeorhinus galeus (Linnaeus, 1758), from the Azores : a comparison based on precision analysis.
    Publication . Duarte, Pedro N.; Silva, Alexandre A.; Menezes, Gui M.; Pinho, Mário Rui
    A vertebrae sample of tope shark, Galeorhinus galeus (Linnaeus, 1758), stratified by sizeclasses,was used to test between different staining techniques of enhancing vertebral growth ring visibility. Four techniques were tested: alizarin red, silver nitrate and cobalt nitrate staining, and the “deep-coned vertebrae” technique. The latter was discarded due to its unsuitability for tope shark vertebrae. The cobalt nitrate original protocol was modified. Upon staining, each vertebra was subject to three replicated independent readings, by a single reader. Within-reader consistency and bias of growth ring counts determination were evaluated using four different precision indices: percent of agreement (PA), average percent error (APE), coefficient of variation (V) and index of precision (D). Results indicated that the vertebrae stained with the cobalt nitrate technique showed both better optic enhancement of growth rings and higher degree of count consistency, comparatively to the alizarin red and silver stained vertebrae. Conclusively, the cobalt nitrate was the most efficient staining technique upon tope shark vertebrae, among the methods tested herein.
    2001Journal article Open access Show more
  • New records and notes on little known shrimps (Crustacea, Decapoda) from Azorean waters.
    Publication . Udekem d'Acoz, Cédric d’; Pinho, Mário Rui; Melo, Octávio; Gonçalves, João M.; Martins, Helen R.
    Five species of shrimps (Crustacea, Decapoda) are recorded for the first time from the Azores: Funchalia villosa (Bouvier, 1905), Parapasiphae sucatifrons S.I. Smith, 1884 Heterocarpus ensifer A. Milne-Edwards, 1881, Heterocarpus laevigatus Bate, 1888 and Plesionika williamsi Forest, 1964. The variability of Plesionika gigliolii (Senna, 1903) and its relationship with P. sindoi (Rathbun, 1906) are discussed.
    2001Journal article Open access Show more
  • Remarks on the genera Balssia Kemp, 1922 and Acanthonyx Latreille, 1828 in the Azores, and first record of Calappa tuerkayana Pastore, 1995 (Crustacea, Decapoda) in the Atlantic Ocean.
    Publication . Udekem d'Acoz, Cédric d'
    The morphology of the Azorean populations of the caridean shrimp Balssia gasti (Balss, 1921) is here examined. This species, which was not previously recorded from the Azores, proves to have a spectacular variability in the development of dorsal carapace processes. The variability of the Azorean majid crabs of the genus Acanthonyx is also studied. Comparison with Mediterranean Acanthonyx lunulatus (Risso, 1816) show some morphological differences but also an important overlap in characters. The Azorean Acanthonyx are therefore identified as A. lunulatus. The Azorean Acanthonyx also show some similarities with the poorly known species Acanthonyx brevifrons A. Milne-Edwards, 1869 from the Cape Verde Islands, a species of uncertain validity. Calappa tuerkayana Pastore, 1995, a crab recently described from the Mediterranean Sea, is recorded for the first time in the Atlantic Ocean: a unique male has been found off Pico island. This specimen is here described and illustrated.
    2001Journal article Open access Show more
  • Fish larvae and zooplankton biomass around Faial Island (Azores archipelago). A preliminary study of species occurrence and relative abundance.
    Publication . Sobrinho-Gonçalves, Luis; Isidro, Eduardo
    Plankton hauls were conducted off Faial island (Azores archipelago, NE Atlantic), to a depth of 100 m, between February and June 1998, covering the spawning period of a number of commercially important fish species. Seventy-three fish larvae taxa were identified, of which 51 were quantified, one of them a new record for the region, Glossanodon leioglossus (Valenciennes, 1848). The fish larvae community was dominated by mesopelagic and bathypelagic elements (namely Myctophidae and Gonostomatidae), a typical oceanic island environment composition. Total zooplankton showed a biomass peak in May that could correspond to the Spring “bloom”. However, the fish larvae showed an abundance minimum in May and a maximum in June, presenting a general negative relationship with zooplankton biomass and indicating a temporal asynchrony between their annual cycles of production. The comparison of fish larvae abundance with those of other NE Atlantic regions suggests that the zooplankton production in the Azores may be similar to the one found in the Iberian Peninsula continental shelf. Significant spatial density gradients (for fish larvae and zooplankton) were not found with either bathymetry or distance from shore.
    2001Journal article Open access Show more