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

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

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Published via the yank Geophysical Union as a part of the Antarctic study 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 acquired through the usa Antarctic study application from USNS Eltanin cruises 3-5, 8-23, 25-28, 35, and 38 in the course of spring, summer time, fall, and wintry weather. Samples have been accumulated from 1962 to 1969, utilizing open-closing and nonclosing plankton nets. details 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. additionally, info on Eltanin cruise 30 are offered, overlaying quite often the Pacific tropical zone through 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 a thousand m). existence levels 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 came upon. furthermore, 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 commonest species of the Antarctic?]Subantarctic sector through the 4 seasons was once Dimophyes arctica. The eudoxid levels of Chelophyes appendiculata, Diphyes dispar, Diphyopsis mitra, Clausophyes ovata, and Heteropyramis maculata have been ample.

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Additional 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)

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Thisspecies was alsopresent in themesopelagic zoneat39ø56'S, 85ø54'W (Table A4). This specieswas absentfrom the summerand winter collections. In the fall, relatively low densitiesof Fig. 56. LensiahumerTotton,1941. Superiornectophore polygastricsappearedin the mesopelagiczone in the [fromAlvarifio,1981a]. Amundsen Sea area(Map A164) and in the bathypelagic andventralview of somatocyst layersat locationsfarthernorthof that areaandnorthof the Bellingshausen Sea(Map A165). Recordsof L. hotspurin the southwestArianticextend throughoutthe tropical-equatorial area to the region In wintertheepipelagicpolygastric population appeared between Mar delPlataandtheTristandaCunhagroup(Map B45).

In the mesopelagic zonethe polygastric abundantspeciesin the epipelagiclayersof the txopicsbut populationexmndedoff the westernpart of the Drake canalsobe foundin the temperatewaters[Alvatiao, 1981a]. In the Pacificit occursfrom 39ø00'N to 43ø00•S in the D. mitrais dis•xibuted in thesouthwest Atlanticmainly epipelagiczone [Alvarifio, 1971]. In the SouthAtlantic this speciesinhabits the regions off South Africa [Alvarifto, Passage (Map A132). throughoutthe tropical-equatorial region, and off Rio Grandedo Sul, Brazil, andRfo de la Plata,Argentina, as wellasin theareaof theSouthArianticgyre(MapB34).

Lelouveteau were populationswere observedsouthof Australia(Map A182) obtainedat the threebathymetriclevelsduringthe fall. At in the epipelagic zone, and eudoxid populationswere obtainedin moderateand relatively low numbersnorth and this seasonit extendedin the epipelagiclayer mainly in moderate numbers over a wide area off Chile, the southof the SouthGeorgiaisland,respectively; at relatively Bellingshausen andAmundsenseas,southof Tasmania,and low concentrationsoff the BellingshausenSea and at several locations along the SubtropicalConvergence Amundsen Sea areas; and at a low concentration south of region(Map A179).

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