Download Antarctic Siphonophores from Plankton Samples of the United by Angeles Alvarino, Joan M. Wojtan, M. Rachel Martinez(auth.) PDF

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

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Published through 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 examine have been got throughout the usa Antarctic study software 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 accrued 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 incorporated. moreover, info on Eltanin cruise 30 are awarded, protecting mostly the Pacific tropical quarter in the course of the summer season, 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 one thousand m). lifestyles phases and seasonal differences also are thought of. 80 species of Siphonophora have been pointed out in those collections. between those, and defined in different places, have been 5 new species: Lensia eltanin, L. eugenioi, L. landrumae, Heteropyramis alcala, and Thalassophyes ferrarii. The eudoxid phases of L. lelouveteau and L. reticulata have been additionally chanced on. moreover, the subsequent infrequent Siphonophora species have been gathered: 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 sector in the course of the 4 seasons used to be Dimophyes arctica. The eudoxid levels of Chelophyes appendiculata, Diphyes dispar, Diphyopsis mitra, Clausophyes ovata, and Heteropyramis maculata have been plentiful.

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Extra resources 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)

Sample text

Muggiaea atlantica Cunningham, 1892. Nectophore. -i•. ii [ .. , ß• . c Fig. 63. Lensiasubtiloides (Lensandvan Riemsdijk,1908). A, superiornectophore; B, inferior nectophore; C, 42 ANTARCTIC SIPHONOPHORES waspreviouslyobservedoff SouthAfrica [Alvariilo,1981a; Margulis, 1972]. Bigelow and Sears [1937] found M. atlantica to be commonin the upper 200-100m of the Mediterranean Sea. In thepresentstudy,the distributionof M. atlanticawas restrictedto the mesopelagic zoneduringthesummer,andit was found southof the SouthOrkneyIslands.

D. Duringthe fall it wasfound in the epipelagicandmesopelagic layers,whereasin winter this populationappearedin all threebathymetriczones. In the fall the epipelagicpolygastricpopulation(Map A98) was abundantlydistributedin moderateand relativelylow concentrationsextending from Chile to the Antarctic Peninsula,the Bellingshausen Sea, the AmundsenSea, and far to the SouthPacificbasin. Anotherarea of relatively 25 D iphyesantarcticaMoser,1925 DiphyesantarcticaMoser, 1925 (Figure36) is endemic to the Antarctic and Subantarcticwaters [Alvarifio, 1971, 1981a].

In themesopelagic zone, relativelylow densitieswere evidentin the AntarcticPacific basin region, southwestof South Island, New Zealand, extendingnorthinto theTasmanSea(Map A187). During the summer,L. multicristatawas againevident in the epipelagicandmesopelagiclayers. A relativelylow concentration was found south of Tasmania in epipelagic and mesopelagiczones (Map A188). 0'E (Table A4). L. multicristata polygastricpopulation was obtained duringthe fall in the epipelagicandbathypelagiczones. In the epipelagiclayer a high concentration extendedinto the surveyed regionat 44ø00'S,86ø00'W,whilea relatively low concentration was obtained southeast of Tasmania (Map A189).

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