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 by means of 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 research have been acquired through 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 wintry weather. 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 incorporated. moreover, facts on Eltanin cruise 30 are awarded, protecting often the Pacific tropical area through the summer time, 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). existence phases 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 phases of L. lelouveteau and L. reticulata have been additionally stumbled on. furthermore, the next 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 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 considerable.

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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)

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The eudoxidstagewasnot detected in the bathypelagic layer. The polygastricstageof C. This formwasfoundonlyin theepipelagic andmesopelagic zonesin limitedareas. A moderateconcentrationwas evident in the epipelagiczone southof New Zealand and in the region of the Pacific Antarcticbasin (Map A87). 34. A, PacificAntarcticbasin(Map A88). In general,the eudoxidstageoccurredat all three polygastric stage; B, superior nectophore; C, inferior nectophore;D, eudoxid. In the epipelagic layer a moderate concentration of the eudoxid form was found concluded thatthemainpopulation of C.

Hotspurin the southwestArianticextend throughoutthe tropical-equatorial area to the region In wintertheepipelagicpolygastric population appeared between Mar delPlataandtheTristandaCunhagroup(Map B45). (Map A170). In mesopelagic layers,polygastricL. hunter Lensia hunter Totton, 1941 Lensia hunterTotton, 1941 (Figure 56), inhabitsthe south temperatezone of the Altantic, Indian, and Pacific oceans. This specieshas been collectedin the Atlantic as farsouth as35ø18'S, 19ø01'W [Totton, 1941]. Two in relatively low numbers at about62ø00'S,141ø00'W isolated distributions were determined for L.

A limited distributionwas notedfor L. Relativelylow concentrations were foundin theepipelagic zoneoff Chile(Map A163). 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).

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