Occurrence of @iNeogloboquadrina pachyderma@@ new subspecies in the shelf-slope sediments of northern Indian Ocean

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dc.contributor.author Setty, M.G.A.P.
dc.date.accessioned 1996-10-02T09:56:55Z
dc.date.accessioned 2017-09-29T13:47:01Z
dc.date.available 1996-10-02T09:56:55Z
dc.date.available 2017-09-29T13:47:01Z
dc.date.issued 1977
dc.identifier.citation Indian Journal of Marine Sciences, vol.6(1); 1977; 72-75
dc.identifier.issn 0379-5136
dc.identifier.uri http://drs.nio.org/drs/handle/2264/5434
dc.description.abstract Specimens of @iNeogloboquadrina pachyderma@@ (Ehrenberg) which are considered to be typical bipolar, coolerwater species, are described in the recent shelf-slope sediments of the northern Indian Ocean as far north as 23~'N in the Arabian Sea and 18~'N in the Bay of Bengal. Studies of hydrological conditions in the Indian Ocean reveal that the Subtropical Subsurface Water Mass is traceable as far north as the Gulf of Aden, and the Indian Ocean Deep Bottom Water Mass originating in the deepest levels of the South Polar region moves northwards and passing through the equator enters the Arabian Sea and the Bay of Bengal; and also the Indian Central Water Mass and the Equatorial Water Mass having different T-S relationships are responsible for the transport of this species to the middle and low latitudes. It is proposed that the forms which occur in the low latitudes (up to 25~'N) in the northern Indian Ocean be referred to henceforth as (1) (a) @iN. pachyderma dextralis typica@@ Setty, n. subsp. (sensu stricto) if the species is right-coiled, and (b) @iN. pachyderma sinistralis typica@@ n. subsp. Setty (sensu stricto) if the species is left-coiled; (2) as @iN. pachyderma dextralis@@, Setty n. subs. (sensu stricto) for those which occur in the mid-latitudes; and (3) all those forms which occur in the high latitudes as @iN. pachyderma@@ (sensu stricto) where they are typically left coiled
dc.language en
dc.publisher CSIR-NISCAIR
dc.relation.ispartof Indian J Mar Sci
dc.relation.isreferencedby SCI
dc.subject Geology and Geophysics
dc.subject Aquatic Communities
dc.subject.other plankton
dc.subject.other sediments
dc.subject.other slope
dc.subject.other new species
dc.subject.other check lists
dc.subject.other water masses
dc.subject.other upwelling
dc.subject.other paleoclimate
dc.subject.other indicator species
dc.subject.other ISW, North Indian Ocean
dc.title Occurrence of @iNeogloboquadrina pachyderma@@ new subspecies in the shelf-slope sediments of northern Indian Ocean
dc.type Journal Article
dc.affiliation.author CSIR-National Institute of Oceanography, Dona Paula, Goa, India


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