1,721,089 research outputs found
RRS Discovery Cruise 175, 18 June - 15 July 1988. Investigations of the flux of biogeochemical material and its transformation by the midwater biota at the BIOTRANS (c. 47N, 20W)
Full text linkA new species of Physophora (Siphonophora: Physonectae: Physophoridae) from the North Atlantic, with comments on related species
No full textA new species of Physophora, belonging to the physonect family of siphonophores Physophoridae is described. It can easily be distinguished from the only other recognised species in that family, P. hydrostatica, by the presence of two types of bracts. The arrangement of the palpons and bracts throws new light on the cormidial organisation of the physophorids, and comparisons are made between both species. The validity of an enigmatic physophorid species, Discolabe quadrigata, is discussed.<br/
Reclassification of the clausophyid siphonophore Clausophyes ovata into the genus Kephyes gen. nov.
No full textComparisons are made between the species currently called Clausophyes ovata and other Clausophyes species. It is concluded that Cl. ovata should be removed to another genus and, consequently, the genus Kephyes gen. nov. is established for it. The relationships of all clausophyid genera are briefly discussed.<br/
RRS Discovery Cruise 224 Leg 2, 30 Dec-17 Jan 1997. Biological and physical investigations in the region of the Almeira-Oran Front (western Mediterranean)
Full text linkThe purpose of Discovery Cruise 224, Leg 2, was to continue the physical and biological surveys previously undertaken during Leg 1 as part of the EEC MAST OMEGA Project; and to undertake comparisons of the western Mediterranean macrozooplankton and micronekton communities on either side of the Almeria-Oran Front.The sampling programme consisted of: 1) Fine scale SeaSoar surveys, at the beginning and end of the leg, to investigate the changes in the structure of the Almeria-Oran frontal system, and to establish the sites for biological sampling. 2) Investigations of the day and night depth distribution, throughout the water column, of the macroplankton and micronekton communities, by means of a vertically stratified series of RMT1+8M net deployments, at two sites on either side of the Almeria-Oran Front. This was largely successful, but bad weather prevented any near-bottom tows being carried out at one of the sites. 3) Investigations of the near-surface cross-frontal distribution of macrozooplankton and micronekton, again using the RMT1+8M net system. 4) Observations on the patterns of acoustic backscatter, using the shipborne ADCP and towed EK500 systems, throughout the cruise and to relate these with data from the biological sampling; with additional ‘sea-truthing’ from Longhurst-Hardy Plankton Recorder deployments.In addition studies were made on the bioluminescent characteristics of the interesting examples of the pelagic fauna
A review of the family Sphaeronectidae (Class Hydrozoa, Order Siphonophora), with the description of three new species
No full textThe last reviewer of the family Sphaeronectidae (Siphonophora, Calycophorae) (Carré, 1968c) considered that it
consisted of a single genus, Sphaeronectes, containing five species; three of which had been recently described by
himself. For the other two species there had been much nomenclatural confusion in the past, as is herein reviewed. It is
considered that for one of these species the name Sphaeronectes koellikeri Huxley (1859) has priority over the name
currently in usage, that is S. gracilis (Claus, 1873; 1874). In addition the status of S. brevitruncata (Chun, 1888) is
reconsidered and the species considered valid, with S. japonica (Stepanjants, 1967) being considered as a likely junior
synonym of it. Three new Sphaeronectes species, S. christiansonae sp. nov., S. haddocki sp. nov. and S. tiburonae sp.
nov., are described, and the systematic position of the genus reconsidered in the light of preliminary molecular
phylogenetic data
RRS Charles Darwin Cruise 85, 11 Apr - 07 May 1994. Pelagic ecology of the Globan Spur shelf break
Full text linkA review of the siphonophore species mentioned in Haeckel’s (1888b) Challenger Monograph
No full textIn his Challenger Monograph Haeckel (1888b) listed a total of 204 species of siphonophores and 36 species of Porpitidae (Disconectae, according to Haeckel), which are now known not to belong to the Siphonophorae. In this paper the siphonophore species have been divided into four categories: a). species that had been described previously by an acknowledged authority other than Haeckel; b). species where Haeckel changed the generic or specific name of a previously described species by another authority, and then ascribed the authority to himself; c). species that Haeckel actually described and illustrated as what he believed to be new; and d). species that Haeckel mentioned in the text as a new species, but with the description deferred to a later publication or simply not given. The validity of the forty-three species that Haeckel actually described is then discussed. A full list of all these species is given in an Appendi
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