Comparative accounts of biological productivity characteristics and estimates of carbon fluxes in the Arabian Sea and the Bay of Bengal

Gauns, Mangesh; Madhupratap, M.; Ramaiah, N.; Jyothibabu, R.; Fernandes, Veronica; Paul, Jane T.; Kumar, S. Prasanna

doi:10.1016/j.dsr2.2005.05.009

Cited by 171 publications

(85 citation statements)

References 33 publications

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“…Average TOC% (0.54 to 0.66%) recorded in the present study is comparable with that recorded by Böttcher et al (2000). Although Arabian Sea has much higher primary productivity than the Bay of Bengal, the organic carbon (C org ) flux is marginally higher in the latter (Ramaswamy and Nair, 1994;Gauns et al, 2005). Higher C org flux in K-G may be attributed to very high fluvial/clastic flux (Subramanian, 1993;Rao, 1985) and subsequent rapid removal of OM by coagulated particles (ballast effect: Ittekkot, 1993) compared to that in Eastern Arabian Sea.…”

Section: Fig 2 Ctd Profiles From Krishna-godavari (A) and Goa Basinsupporting

confidence: 74%

Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India

et al. 2007

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Several cores from Krishna-Godavari (Western Bay of Bengal) and Goa (Eastern Arabian Sea) basins have been studied for pore water sulfate concentrations in order to understand and contrast the diagenetic processes. K-G sediments differ markedly from Goa sediments in pore water sulfate gradients and depth-integrated sulfate reduction rates. Significantly higher sulfate reduction rates in K-G sediments (3.6 to 15.8 nmol cm -2 day -1 ), compared to that in Goa sediments (0.011 to 0.94 nmol cm -2 day -1 ), can be attributed to higher sedimentation rates. Lower exposure time to oxygen for the organic matter in K-G sediments has preserved reactive organic compounds required for sulfate reducers and possibly methanogens. Authigenic carbonates with depleted carbon isotopic composition (δ 13 C = -48 to -50‰) at the base of the sulfate reduction zone in a core from K-G suggests anaerobic methane oxidation (AMO) process. The possibility, that the underlying methane gas hydrate zone is acting as a methane source for sulfate reduction can not be negated specially in light of the existing geophysical studies. Both methane and the fermentation products of organic matter degradation served as a substrate for sulfate reduction. However, a clear understanding of there relative importance needs further investigation.

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Section: Fig 2 Ctd Profiles From Krishna-godavari (A) and Goa Basinsupporting

confidence: 74%

Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India

et al. 2007

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“…Although the geographical settings of these two basins are somewhat similar, the hydrographic and hydrochemical characteristics differ widely. The west coast receives lower volumes of river runoff (0.3 9 10 12 m -3 year -1 ) compared to east coast (1.6 9 10 12 m -3 year -1 ) (Gauns et al 2005). Rivers Tapi and Narmada are two of the very few major rivers draining along the west coast.…”

Section: Subfamily Caprellinae Leach 1814mentioning

confidence: 99%

“…The samples could not be accessed for species-level identification during the present study. Ganesh (2003) and Ganesh and Raman (2007) carried out the study of soft bottoms macrobenthic communities of the northeast coast (Bay of Bengal) during January (Gauns et al 2005). Although the geographical settings of these two basins are somewhat similar, the hydrographic and hydrochemical characteristics differ widely.…”

Section: Subfamily Caprellinae Leach 1814mentioning

confidence: 99%

Caprellids (Crustacea: Amphipoda) from India

et al. 2009

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The caprellid fauna of India is investigated. A total of 538 samples (including algae, seagrasses, sponges, hydroids, ascidians, bryozoans, encrusted dead corals, coral rubble, fine and coarse sediments) were collected from 39 stations along the coast of India, covering a wide diversity of habitats from intertidal to 12 m water depth. A new species (Jigurru longimanus n.sp.) is described, and figures of the 11 valid species reported so far from India are given together with a key for their identification. No caprellids were found in sediments from the northeast (16-208N) coast of India while they were abundant in the southeast and west coast. Decreases in salinity due to river discharges associated with lower values of oxygen, higher water temperatures and lower nutrient inputs along the east coast could explain these differences in caprellid composition between the two coastlines. Significantly, lower abundance of caprellids in India, as in other tropical ecosystems, is probably related to the lack of species belonging to the genus Caprella, which reach very high abundances in temperate waters.

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“…Comparison between MSP biomass in the mixed layer and thermocline showed significant variation during different seasons (Figure 12 a). The marked difference in MSP biomass between mixed and thermocline layers are general features in the Arabian Sea (Madhupratap et al, 1996a;Padmavati et al, 1998;Smith and Madhupratap, 2004;Gauns et al, 2005). This is primarily due to the fact that the mixed layer represents the surface ocean layer, which is illuminated optimally and therefore a major part of the total ocean primary productivity takes place in this layer.…”

Section: Basin Scalementioning

confidence: 99%

“…The biomass of the samples was measured following displacement volume method (Postel et al, 2000) and converted to dry weight using available numerical factors (1ml displacement volume = 0.075g dry weight; Haridas,1986, 1990;Gauns et al, 2005).…”

Section: Mspmentioning

confidence: 99%

Re-evaluation of ‘paradox of mesozooplankton’ in the eastern Arabian Sea based on ship and satellite observations

Jyothibabu

Madhu

Habeebrehman

et al. 2010

Journal of Marine Systems

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In the central and eastern Arabian Sea (EAS), biomass and production of phytoplankton are known to vary spatially and seasonally whereas, biomass of mesozooplankton (MSP) is reported to be constant. This apparent contradiction has been called 'Arabian Sea Paradox'. However, it is important to note that the paradox of MSP is based on a very limited seasonal data (from 5-7 locations). Therefore, we reconsidered the paradox of MSP based on intensive in-situ observations at 39 -40 locations in the EAS. In agreement with the known seasonal difference in phytoplankton standing stock in the EAS, we analysed the MSP data in two ways using two-way nested ANOVA. In 'basin scale' analysis, MSP data were analysed from the EAS were pooled and seasonal and inshore -offshore variations were analysed for the entire region. In 'regional scale' analysis, MSP data were analysed separately for (a) northern region (north of 15°N) and (b) southern regions (15°N and south of it). Satellite data of chlorophyll a, SST and wind speed were also analysed to show the major differences in oceanographic features in the northern and southern EAS. The analyses showed prominently high chlorophyll a (av. 1mg m ) in the southern region during most of the year mainly due to thermohaline stratification. The MSP biomass was distributed almost in a similar way as that of phytoplankton stock with statistically significant spatial and seasonal variations in the northern and southern regions. In this paper, we review the 'paradox of MSP' and present clear and new evidences to show that this concept is not logically applicable for EAS.

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Comparative accounts of biological productivity characteristics and estimates of carbon fluxes in the Arabian Sea and the Bay of Bengal

Cited by 171 publications

References 33 publications

Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India

Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India

Caprellids (Crustacea: Amphipoda) from India

Re-evaluation of ‘paradox of mesozooplankton’ in the eastern Arabian Sea based on ship and satellite observations

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