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Abyssal benthos of the Central Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Abyssal benthos of the Central Indian Ocean
 
Creator Parulekar, A.H.
Harkantra, S.N.
Ansari, Z.A.
Matondkar, S.G.P.
 
Subject Aquatic Communities
ferromanganese nodules
euphotic zone
meiobenthos
biomass
check lists
abyssal zone
benthos
ISW, Indian Ocean
 
Description Quantitative studies of the abyssal benthos (3600 to 5300 m) of the central Indian Ocean show a rich fauna and high standing crops. Density of 3 meiofaunal and 12 macrofaunal taxa are large (2175 to 15233; chi = 6441 m-2). Polychaetes (41.6%), peracarid crustaceans (31.7%), ophiuroids (12.2%), echiuroid-bryozoa (9.7%), molluscs (4.8%), and agglutinating rhizopod protozoans form the macrofauna. Meiofaunal taxa are nematodes (69.4%), harpacticoid copepods (26.6%), and ostracods (4%). Meiofauna abundances are positively correlated with distance from shore, whereas the distribution and abundance of macrofauna are independent of variations in depth and distance from the shore. Ratio of macro to meiofauna in the total population is 1 to 31. The benthic standing crop is uniformly high (0.54 to 13.73 g m-2; chi = 2.70 g m-2) and many times larger than previously reported for comparable depths in other oceans and from the same region. Biomass values are significantly related to distance from shore and the type of substratum. Contribution of macro and meiofauna to the total standing crop was in the ratio of 31 to 1. High benthic biomass and rich fauna are consequences of high organic production in the euphotic zone. The correlation between biomass of the total oxidizable organic matter in the water column and the benthic standing crop is statistically significant (r = -0.64) at the P 0.05 level, Rich fauna and high standing crop were associated with the occurrence of polymetallic nodules
 
Date 1995-05-10T10:00:53Z
2017-09-29T13:48:38Z
1995-05-10T10:00:53Z
2017-09-29T13:48:38Z
1982
 
Type Journal Article
 
Identifier Deep Sea Research, vol.29; 1982; 1531-1537
0198-0149
http://drs.nio.org/drs/handle/2264/6588
 
Language en
 
Relation Deep-Sea Res
SCI
 
Publisher Elsevier