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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(4) [August 2011] >
| Title: | Myctophid and pelagic shrimp assemblages in the oxygen minimum zone of the Andaman Sea during the winter monsoon |
| Authors: | Karuppasamy, P.K.
Raj, C.M.Lalu
Muraleedharan, K.R.
Nair, Maheswari |
| Keywords: | Micronekton
Vertical migration
Oxygen minimum zone
Winter monsoon
Andaman Sea |
| Issue Date: | Aug-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Stratified samples were collected with a
Multiple Plankton Net for assessing the myctophid and pelagic shrimps
composition from the Andaman Sea during the winter monsoon. Andaman
Sea has a fair representation of mesopelagic micronektonic fauna such as the
myctophids and pelagic shrimps in the upper 1000 m depth. Among the myctophids,
Benthosema fibulatum had the maximum biomass followed by Diaphus
lucidus and Benthosema pterotum. Among the pelagic shrimps Sergestus
seminudus and Oplophorus types were the dominant species. Sergestes
seminudus was present at all depths [up to 1000 m] and its distribution
pattern suggested the cocurence of a strong diurnal vertical migration.
Temperature decreased from the mixed layer depth downwards. Salinity did not
show any significant variation. Dissolved oxygen ranged
between 2.8 and 4.8 mL.L-1 in the upper 75 m and from 0.05 to 0.2
mL.L-1 in the 150-650 m column, with a gradual increase in the
bottom layers [>0.8 mL.L-1]. Majority of myctophids and shripms
occurred in abundance in the oxygen minimum zone [150-650 m]. |
| Page(s): | 535-541 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.40(4) [August 2011]
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