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 way of 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 bought in the course of the usa Antarctic learn 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 accumulated 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, masking commonly 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 phases 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 upon. additionally, 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 quarter in the course of 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 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

During the fall, polygastric populations of L. hunter appeared in the epipelagiczone in moderateconcentrations, in a wide regionextendingoff the tip of Chile andthe Bellingshausen Sea and Peter I Island, with another relatively low concentration occurringsouthof Tasmaniaandsouthwest of New Zealand'sSouthIsland(Map 167). In themesopelagic zone the population close to the BellingshausenSea persisted, althoughremainingat relativelylow densities and extendingcloseto EllsworthLand, Antarctica(Map A168).

In themesopelagic layers it was foundonlywestof theBellingshausen Sea(Map A82). In the Southwest Atlantic, S. turgida appeared distributed throughout the tropical and central South Atlanticgyreregions(Map B28). Sulculeolaria monoica (Chun, 1888) (Figure 32) is widely distributedthroughoutthe tropical-equatorialand warm temperateregionsof the Ariantic,Pacific,andIndian oceans [Alvarifio, 1971]. The southernmostrecord was obtained along the Chilean coastal region and Juan Femfmdez Islands, at30ø00'S, 84ø30•/q [Leloup, 1932].

In contrast,duringthe fall and winter,no eudoxidswere observedin the collections. In the fall the D. dispar polygastricpopulationin the epipelagiczone appearedin moderate concentration off the west side of the Drake Passage(Map A124). This populationpersistedin the mesopelagic zone,althoughat relativelylow densities(Map A125). It was not observedin the bathypelagiclayers duringautumn. In winter,D. disparwas foundonly in the mesopelagiczone, and a low concentration appearedsouth of theSouthGeorgiaisland(Map A126).

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