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Navas-Pereira, D. & Vannucci, M. (1991). The Hydromedusae and water masses of the Indian Ocean. Bolm Inst. Oceanogr. 39(1): 25-60.
6376
Navas-Pereira, D. & Vannucci, M.
1991
The Hydromedusae and water masses of the Indian Ocean
Bolm Inst. Oceanogr.
39(1): 25-60
Publication
This analysis of distribution and abundance of species of Hydromedusae completes a report (Vannucci & Navas, 1973b) on the ecology of Indian Ocean Hydromedusae based on the zooplankton collected during the International Indian Ocean Expedition (IIOE). Dis
This analysis of distribution and abundance of species of Hydromedusae completes a report (Vannucci & Navas, 1973b) on the ecology of Indian Ocean Hydromedusae based on the zooplankton collected during the International Indian Ocean Expedition (IIOE). Distribution and abundance are taken here to be the ecological expression of variability of species in space and time. The aim was to identify the biological signature of below surface water masses that cannot be identified by remote sensing techniques. Selected species were taken as biological units, the oceanic water masses as defined by their T-S and T-O2 diagrammes were taken as the non biological units. Taken together they define different ecosystems of the Indian Ocean. About 45,000 specimens of hydromedusae taken at 480 stations were sorted from 900 plankton and all specimens were determined and counted. Several hauls, mostly stratified, were taken with closing nets, but not all contained hydromedusae. The distribution of each species was studied in relation to water salinity, temperature and dissolved oxygen, the limits of ecological tolerance and preference were defined by the environmental characteristics of the layers sampled by the nets and are given for each species. These can be grouped as follows: 1. Deep water species, cold tolerant, often eurytopic; 2. Antarctic species, cold loving, usually stenothermal with preference for low salinity; 3. Indian Ocean Central Water species, with preference for temperature lower than 19°C and salinity not much higher than 35%, usually found at sub-surface or intermediate depths, they may spread into the Arabian Sea of Bengal in surface layers; 4. Indian Ocean Equatorial System species, warm tolerant, usually prefer comparatively low salinity, high temperature and high oxygen content; 5. Bay of Bengal Surface Water species, found in surface layers of the Bay, with preference for low salinity, high temperature and high oxygen content; 6. Arabian Sea Surface Water species prefer very high salinity and high temperature; 7. Rare species. Some immigrants from the Mediterranean Sea are described and many species were found to be tolerant of dissolved oxygen content as low as 0.2ml/l. Numerous individuals of many species were found to agglomerate at boundary layers.
Ecology
Zoogeography, Biogeography (generalities), Geographic distribution
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Aegina citrea Eschscholtz, 1829 (additional source)
Aeginura grimaldii Maas, 1904 (additional source)
Aequorea aequorea (Forsskål, 1775) accepted as Aequorea forskalea Péron & Lesueur, 1810 (additional source)
Aequorea macrodactyla (Brandt, 1835) (additional source)
Aequorea pensilis (Haeckel, 1879) (additional source)
Aglaura hemistoma Péron & Lesueur, 1810 (additional source)
Botrynema brucei Browne, 1908 (additional source)
Bougainvillia fulva Agassiz & Mayer, 1899 (basis of record)
Bougainvillia niobe Mayer, 1894 (basis of record)
Calycopsis papillata Bigelow, 1918 (basis of record)
Calycopsis simulans (Bigelow, 1909) (basis of record)
Colobonema sericeum Vanhöffen, 1902 (additional source)
Crossota alba Bigelow, 1913 (basis of record)
Crossota brunnea Vanhöffen, 1902 (basis of record)
Cunina duplicata Maas, 1893 (basis of record)
Cunina octonaria McCrady, 1859 (additional source)
Cunina peregrina Bigelow, 1909 (basis of record)
Cytaeis tetrastyla Eschscholtz, 1829 (additional source)
Geryonia proboscidalis (Forsskål, 1775) (additional source)
Halicreas minimum Fewkes, 1882 (additional source)
Halitrephes maasi Bigelow, 1909 (additional source)
Laodicea indica Browne, 1905 (basis of record)
Leuckartiara octona (Fleming, 1823) (additional source)
Liriope tetraphylla (Chamisso & Eysenhardt, 1821) (additional source)
Neoturris pileata (Forsskål, 1775) (additional source)
Pandea conica (Quoy & Gaimard, 1827) (additional source)
Pantachogon haeckeli Maas, 1893 (additional source)
Pantachogon scotti Browne, 1910 (basis of record)
Pegantha clara R.P. Bigelow, 1909 (additional source)
Pegantha martagon Haeckel, 1879 (basis of record)
Pegantha triloba Haeckel, 1879 (additional source)
Persa incolorata McCrady, 1859 (additional source)
Phialidium hemisphaericum (Linnaeus, 1767) accepted as Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Protiaropsis anonyma (Maas, 1905) (basis of record)
Protiaropsis minor (Vanhöffen, 1911) (basis of record)
Rhopalonema velatum Gegenbaur, 1857 (additional source)
Solmissus marshalli Agassiz & Mayer, 1902 (basis of record)
Solmundella bitentaculata (Quoy & Gaimard, 1833) (additional source)
Stomotoca pterophylla Haeckel, 1879 accepted as Larsonia pterophylla (Haeckel, 1879) (basis of record)
Tetrorchis erythrogaster Bigelow, 1909 (additional source)
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