Get Antarctic Siphonophores from Plankton Samples of the United PDF

By Angeles Alvarino, Joan M. Wojtan, M. Rachel Martinez(auth.)

ISBN-10: 0875901735

ISBN-13: 9780875901732

ISBN-10: 1118664760

ISBN-13: 9781118664766

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Published by means of the yank Geophysical Union as a part of the Antarctic learn Series.

The distribution of Siphonophora of the Antarctic, Subantarctic, and adjoining areas of the Pacific and Atlantic Oceans is defined. Specimens for this learn have been got through the usa Antarctic examine application from USNS Eltanin cruises 3-5, 8-23, 25-28, 35, and 38 in the course of spring, summer time, fall, and iciness. Samples have been gathered from 1962 to 1969, utilizing open-closing and nonclosing plankton nets. info is compiled on horizontal distributions of siphonophores within the South Atlantic Ocean west of 0°. Illustrations of the species, and maps of distribution on the 3 bathymetric degrees, also are integrated. additionally, information on Eltanin cruise 30 are offered, protecting mostly the Pacific tropical area through the summer time, with a few stations under the equator (austral winter). Vertical distributions of every species are mentioned for the 3 bathymetric zones: epipelagic (200-0 m), mesopelagic (1000-200 m), and bathypelagic (below a thousand m). existence levels and differences due to the season also are thought of. 80 species of Siphonophora have been pointed out in those collections. between those, and defined in other places, have been 5 new species: Lensia eltanin, L. eugenioi, L. landrumae, Heteropyramis alcala, and Thalassophyes ferrarii. The eudoxid levels of L. lelouveteau and L. reticulata have been additionally stumbled on. additionally, the next infrequent Siphonophora species have been accumulated: Halistemma cupulifera, Desmophyes annectens, Lilyopsis rosea, Eudoxia macra, Lensia achilles, L. baryi, L. exeter, L. grimaldii, L. hostile, Nectocarmen antonioi, and Clausophyes galeata. the most typical species of the Antarctic?]Subantarctic quarter through the 4 seasons was once Dimophyes arctica. The eudoxid phases of Chelophyes appendiculata, Diphyes dispar, Diphyopsis mitra, Clausophyes ovata, and Heteropyramis maculata have been ample.

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Extra info for Antarctic Siphonophores from Plankton Samples of the United States Antarctic Research Program: Eltanin Cruises for Spring, Summer, Fall, and Winter (Cruises 3-5, 8-23, 25-28, 30, 35, and 38)

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In the epipelagic zonea relatively lowtohighdensity occurred off Chilewesttoabout100ø00'W andasfarsouth as41ø40'S, being thehighdensity evident from30ø00'S to35ø30'S andfrom70ø30'Wto 87ø00'W,extending intothePacific Antarcticbasinregion,southwest of SouthIsland,New Zealand, and the Tasman Sea (Map A85). In the mesopelagic zonea relatively lowconcentration wasfound at about38ø45'Sand95ø00'W,thePacificAntarctic basin region,andNew Zealand,extending intotheTasman Sea (Map A86). The eudoxidstagewasnot detected in the bathypelagic layer.

54. LensiahostileTotton, 1941. Superiornectophore [from Alvaril•o, 1981a]. L. hostile was presentonly in the mesopelagiczone during spring. L. In the fall a relatively low densitypolygastric populationappearedin the epipelagiczone, extendingoff Chile and the Juan Fem•tndez Islands region. In the mesopelagic zone it was found in relatively low concentrationin the westernpart of the BellingshausenSea. These records constitute the southernmost occurrences of this species,probably introducedinto these areasby the Fig.

Thisspecies Fig. 43. LensiabaryiTotton,1965. A, superiornectophore; B, inferiornectophore. LensiacampanellaMoser,1925 LensiacampanellaMoser, 1925 (Figure44), is typical of tropical regions,being an indicator of warm surface currents[Alvarifto, 1981a, 1985; Margulis, 1971; Pugh, 19741. L. campanellawas presentonly during the springand fall. In the epipelagiczone the polygastricstage was Fig. 44. Le•ia c•pa•lla (Moser, 1925). Superior nectophore [from Alvarifto,1981a]. inhabits various depths in the Pacific Ocean, mostly occurringin the bathypelagicand mesopelagiclayersin the equatorial region [Alvarifio, 1971].

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Antarctic Siphonophores from Plankton Samples of the United States Antarctic Research Program: Eltanin Cruises for Spring, Summer, Fall, and Winter (Cruises 3-5, 8-23, 25-28, 30, 35, and 38) by Angeles Alvarino, Joan M. Wojtan, M. Rachel Martinez(auth.)


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