By Angeles Alvarino, Joan M. Wojtan, M. Rachel Martinez(auth.)
About The Product
Published via the yank Geophysical Union as a part of the Antarctic examine 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 throughout the usa Antarctic examine application from USNS Eltanin cruises 3-5, 8-23, 25-28, 35, and 38 in the course of spring, summer season, fall, and wintry weather. 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 integrated. moreover, info on Eltanin cruise 30 are offered, overlaying ordinarily the Pacific tropical sector through the summer season, with a few stations less than 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). lifestyles levels and seasonal differences 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 phases of L. lelouveteau and L. reticulata have been additionally came across. 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 commonest species of the Antarctic?]Subantarctic sector through 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 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)
Lensiasubtiloides (Lensandvan Riemsdijk,1908). A, superiornectophore; B, inferior nectophore; C, 42 ANTARCTIC SIPHONOPHORES waspreviouslyobservedoff SouthAfrica [Alvariilo,1981a; Margulis, 1972]. Bigelow and Sears  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. Only the polygastricform wasobserved. M. atlantica was obtainedduringthe fall cruises,but it wasabsentfrom springandwintercollections.
At this season, low numbers of eudoxids were obtained in the epipelagiclayer southof Auslxalia(Map A143). E. spiralis was not found in the mesopelagic or bathypelagiczones duringthewinter. In the southwestAtlantic, E. spiralis was frequently found throughout the Ixopical-equatorialand centxal temperate regions(MapB35). Populations foundduringthe Antarctic Program in the southernmostlatitudes were probablytaken in eddiesand tings that had branchedoff fromthemaincurrentsin thewarmregions. Totton  observedthis speciesoff British Columbia, and the second record [Alvarh'Io,1985] was off California.
5'W throughoutthe oceanicregion,extendingfrom southBrazil andArgentinato the Tristanda Cunhagrouparea,andoff [Totton, 1941]. Recife,Brazil, in the equatorialregion(Map B42). In the present study, the polygastric stage of L. grimaldii was observedonly duringthe springand fall. In the fall it was observedin the epipelagiclayers recordedin the South Atlantic, extendingsouthwardfrom theTristanda Cunhagroupregionto the ScotiaSea[Totton, inarelatively lowconcentration at43ø15'S, 97ø37'W. 1941]; in the Indian Oceanit appearedin the SouthAfrica In the southwestAtlantic, records extend alm•g the andMozambiqueChannelregions,and in the Pacificit was tropical-equatorial regionoff Brazil, andmainly aroundthe observedoff California and Baja California [Alvariilo, archipelagos and off the Rio Grandedo Sul region (Map B41).
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.)