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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.39 [2010] >
IJMS Vol.39(3) [September 2010] >
| Title: | Seasonal variability in biological carbon biomass standing stocks and production in the surface layers of the Bay of Bengal |
| Authors: | Ramaiah, N
Fernandes, V
Paul, J T
Jyothibabu, R
Mangesh, G
Jayraj, E A |
| Issue Date: | Sep-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | As a part of the Bay of Bengal Process Study,
several biological characteristics were investigated during summer monsoon
(SuM; July-August 2001), fall intermonsoon (FIM, September-August 2002), spring
intermonsoon
(SpIM; April-May 2003) and northeast monsoon (NEM, Dec 2005-January 2006). Chl a carbon during SuM, FIM, SpIM and NEM
averaged 688, 767, 1212 and 1057 mg C m-2 in the western Bay (WB) and 518, 904, 789 and1023
mg C m-2 in the central Bay (CB). Primary productivity
(PP) averaged 326, 281, 366 and 280 mg C m-2 d-1 in the WB and 144, 306, 241 and 375 mg C m-2d-1 in the CB respectively. Shallow euphotic depths
(~<55m) apparently are not conducive for (PP) in the
0-120 m
column. Heterotrophic bacterial carbon biomass was sizable and averaged 282,
662, 95 and 288 mg C m-2 in the WB and was 677, 227, 104 and 333 mg C m-2 in the CB during SuM, FIM, SpIM and NEM
respectively. They appear very crucial in governing the abundances of
microheterotrophs in the southern and, open-ocean regions of the Bay. Microzooplankton
were much poorer in abundance than those in the Arabian
Sea except during SpIM. Their maximum carbon biomass (WB: 233; CB:
327 mg C m-2 in the top 120 m was observed during SpIM. In the upper 200 m, the mesozooplankton
biomass did not show much variation between the season (WB: 222, 906, 2428 and
988 mg C m-2 and CB: 587, 1036, 821 and 808 mg C m-2 d-1
respectively during SuM, FIM, SpIM and NEM). Incidentally it was mostly
decoupled with chl a and PP. Cold-core eddies observed during most
sampled seasons seem to bear an enhancing influence on the overall biological
productivity processes. |
| Page(s): | 369-379 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.39(3) [September 2010]
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