Neogene deep sea benthic foraminiferal diversity in the Indian Ocean: Paleoceanographic implications

A taxonomic study was carried out on strain CIC4N-9T, which was isolated from deep-sea water of the Indian Ocean. The bacterium was Gram-stain-negative, catalase- and oxidase-positive, rod-shaped and non-motile. Growth was observed at salinities of 0–9% and at temperatures of 4–41 °C. The isolate was able to degrade gelatin but not aesculin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain CIC4N-9T belonged to the genus Pararhodobacter , with the highest sequence similarity to the only recognized species, Pararhodobacter aggregans D1-19T (96.9 %). The average nucleotide identity and estimated DNA–DNA hybridization values between strain CIC4N-9T and P. aggregans D1-19T were 80.4 and 23.0 %, respectively. The principal fatty acids were summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c), C16 : 0, C18 : 1ω7c 11-methyl, C18 : 0 and C17 : 0. The G+C content of the chromosomal DNA was 66.8 mol%. The sole respiratory quinone was determined to be Q-10. Phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, diphosphatidylglycerol, two unknown phospholipids, four unknown aminolipids and one unknown polar lipid were present. The combined genotypic and phenotypic data show that strain CIC4N-9T represents a novel species within the genus Pararhodobacter , for which the name Pararhodobacter marinus sp. nov. is proposed. The type strain is CIC4N-9T (=MCCC 1A01225T=KCTC 52336T).

Download Full-text

Deep-Sea Challenge: The John Murray/Mabahiss Expedition to the Indian Ocean, 1933-34. A. L. Rice

Isis ◽

10.1086/356179 ◽

1992 ◽

Vol 83 (2) ◽

pp. 356-357

Author(s):

Harold L. Burstyn

Keyword(s):

Indian Ocean ◽

Deep Sea ◽

The Indian Ocean

Download Full-text

New genera, species and occurrence records of Goniasteridae (Asteroidea; Echinodermata) from the Indian Ocean

Zootaxa ◽

10.11646/zootaxa.4539.1.1 ◽

2018 ◽

Vol 4539 (1) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

CHRISTOPHER L. MAH

Keyword(s):

Indian Ocean ◽

Deep Sea ◽

Western Indian Ocean ◽

Gut Contents ◽

New Genera ◽

Late 20Th Century ◽

The North ◽

Marine Habitats ◽

The Indian Ocean ◽

Occurrence Records

Modern goniasterids are the most numerous of living asteroids in terms of described genera and species and they have important ecological roles from shallow to deep-water marine habitats. Recent MNHN expeditions and historical collections in the USNM have resulted in the discovery of 18 new species, three new genera and multiple new occurrence records from the western Indian Ocean region including Madagascar, Glorioso and Mayotte islands, Walters Shoal, South Africa, and Somalia. This report provides the first significant contribution to knowledge of deep-sea Asteroidea from the Indian Ocean since the late 20th Century. Several deep-sea species, previously known from the North Pacific are now reported from the western Indian Ocean. Gut contents from Stellaster and Ogmaster indicate deposit feeding. Feeding modes of this and other deep-sea species are discussed. Comments are made on fossil members of included taxa. A checklist of Indian Ocean Goniasteridae is also included.

Download Full-text

Micro-forms of hay-silica glass and of volcanic glass

Mineralogical Magazine and Journal of the Mineralogical Society ◽

10.1180/minmag.1968.283.036.14 ◽

1968 ◽

Vol 36 (283) ◽

pp. 1012-1023 ◽

Cited By ~ 12

Author(s):

George Baker

Keyword(s):

Indian Ocean ◽

Deep Sea ◽

Silica Glass ◽

Volcanic Glass ◽

Volcanic Eruptions ◽

North West ◽

South West ◽

Deep Sea Sediments ◽

The Indian Ocean ◽

Lava Fountains

SummaryIn view of recently reported microtektites in deep-sea sediments north-west, south-west, and south of Australia, attention is drawn to the occurrence of minute forms of hay-silica glass among the products of incineration of opal-bearing vegetation in haystacks, and to the minute forms of volcanic glass ejected in lava fountains. These terrestrial micro-forms of glass have properties within the range of those for the fossil glassy bodies named ‘microtektites’. It is possible that the fusion of opal contained in silica-accumulator plants during fierce, prehistoric forest, bush, and grass fires in Australia generated micro-forms of glass that became readily airborne and drifted away in up-currents. Carried by the south-east Trades, they would ultimately descend over the Wharton Basin in the Indian Ocean. Strong to violent northerlies and north-easterlies (Brickfielder Winds) would carry them over the ocean south and south-west of Australia. Thus they could contribute to the deposits of bodies of glass regarded as microtektites in deep-sea sediments. Many microbodies of glass in the Wharton Basin could have had their origin in the Javanese volcanic eruptions.

Download Full-text