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 by way 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 bought through the usa Antarctic examine software 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. 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 integrated. moreover, facts on Eltanin cruise 30 are awarded, overlaying as a rule the Pacific tropical sector in the course of 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 one 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 somewhere else, have been 5 new species: Lensia eltanin, L. eugenioi, L. landrumae, Heteropyramis alcala, and Thalassophyes ferrarii. The eudoxid levels of L. lelouveteau and L. reticulata have been additionally chanced on. moreover, the next infrequent Siphonophora species have been amassed: 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 quarter throughout the 4 seasons used to be Dimophyes arctica. The eudoxid phases 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)

Example text

Lensiamulticristata(Moser, 1925) Lensia multicristata (Moser, 1925) (Figure 60), a mesopelagicspecies[Alvarillo, 1974], is cosmopolitan in the temperateandwarm oceanicregions[Alvarillo, 1981a]. In the easternPacific Ocean an epipelagicdistributionbetween 38ø00'Nand48ø00'Shasbeennoted;however, between Baja CaliforniaandHawaii andin theequatorialregionit is mostly mesopelagic and bathypelagic in distribution [Alvarifio, 1971, 1985]. L. multicristatawasfoundin boththeepipelagicandthe mesopelagiclayers during the spring.

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.

The population of D. arcticain themesopelagic zoneextended eudoxidstage,however,occurredonly in the mesopelagic from westof the Drake Passageto the AmundsenSea,with zone, with relatively low concentrationsfound off the Also during the fall, eudoxids were found in moderate densities intheregion between 54ø00'S and99ø003h r(Map A100). It is interestingthat the eudoxid population was recordedonly in the mesopelagic zoneduringthe fall. This strangesituationmay be due to the delicatenatureof the gonophores,being easily destroyed or damaged by Adareextending northto 66ø30'S(Map A106).

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