The response of microzooplankton (20–200μm) to coastal upwelling and summer stratification in the southeastern Arabian Sea

Jyothibabu, R.; Devi, C.R. Asha; Madhu, N.V.; Sabu, P.; Jayalakshmy, K.V.; Jacob, J.; Habeebrehman, H.; Prabhakaran, M. P.; Balasubramanian, T.; Nair, K.K.C.

doi:10.1016/j.csr.2007.12.001

Cited by 71 publications

(33 citation statements)

References 47 publications

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“…The general pattern of chlorophyll a distribution in the EAS is shown in Figure 6, which is in support of the already known seasonal pattern acquired by ship measurements (Bhattathiri et al, 1996;Madhupratap et al, 2001, Prasannakumar et al, 2001Madhu, 2004;Dwivedi et al, 2006;Jyothibabu et al, 2008a). Enhancement of chlorophyll a in the inshore regions of southern region during the peak and late summer monsoon period; and in the entire northern region during the winter monsoon period was evident in Figure 6.…”

Section: Pattern Of Chlorophyll a With Respect To Sst And Wind Speedsupporting

confidence: 56%

“…It is well evident in Figure 6&7 that the SEAS remain less productive, during the winter and spring intermonsoon due to the persistence of low saline Bay of Bengal water (Jyothibabu et al, 2008a).…”

Section: Pattern Of Chlorophyll a With Respect To Sst And Wind Speedmentioning

confidence: 91%

“…However, logically, there could be a time lag between the initiation of upwelling and its translation into biological production. Therefore, on a biological standpoint, we consider the summer monsoon from May 15 to September 30, winter monsoon from November 1 to February 28 and spring intermonsoon from March 1 to May 14 (Jyothibabu et al, 2008a).…”

Section: Study Area and Environmentmentioning

confidence: 99%

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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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Section: Pattern Of Chlorophyll a With Respect To Sst And Wind Speedsupporting

confidence: 56%

Section: Pattern Of Chlorophyll a With Respect To Sst And Wind Speedmentioning

confidence: 91%

Section: Study Area and Environmentmentioning

confidence: 99%

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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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“…Seasonally averaged microzooplankton biomasses were 22.3, 36.1 and 24.6 mmol C m −3 , respectively, during the southwest monsoon, post-monsoon and pre-monsoon periods, and were largely supported by non-living particulate carbon (detritus) particularly during the non-monsoon seasons. Experimental studies revealed significant microzooplankton grazing on phytoplankton standing stock, mainly (>60 %) by the 2005; Jyothibabu et al 2008;AshaDevi et al 2010) indicate that the microzooplankton community plays a key role in the food web of the region. However, there has been no study of microzooplankton in any of the estuaries except Cochin backwaters (Jyothibabu et al 2006) along the west coast of India.…”

Section: Introductionmentioning

confidence: 98%

Seasonal variations in abundance, biomass and grazing rates of microzooplankton in a tropical monsoonal estuary

et al. 2015

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“…However, evidence for the localized source of upwelling close to the southwestern boundary of the BoB during summer had been reported (Shetye et al, 1991). The stratification and low solar radiation during the monsoon periods result in low chlorophyll-a and primary productivity in the western BoB (Jyothibabu et al, 2008a) and the microzooplankton play an important role in transferring primary organic carbon from smaller phytoplankton to mesozooplankton (Jyothibabu et al, 2008b). During the south-west (SW) monsoon, the integrated chlorophyll-a is about a factor of 4-5 less in the Bay compared to that in the Arabian Sea (Prasanna Kumar et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Evidence for enhanced chlorophyll-a levels in the Bay of Bengal during early north-east monsoon

Bhushan¹,

Bikkina²,

Chatterjee³

et al. 2018

J. Oceanogr. Mar. Sci.

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To understand the chlorophyll-a distribution in the neritic waters of the northern Indian Ocean, which comprises the Arabian Sea on the west and the Bay of Bengal on the east, seawater samples were collected during early north-east monsoon season (November, 2008). The column integrated chlorophyll-a over the Arabian Sea and the North Bay of Bengal exhibit high concentrations. However, the southernmost station (0806) shows enhanced chlorophyll-a concentration compared to other stations in the south Bay (0807, 0808 and 0809). This is attributed to eddy pumping of nutrients from subsurface to surface waters of the Bay during the study period due to cyclonic conditions. This observation is further supported by the lack of nutrients in the surface waters at the other stations from the south Bay compared to the station 0806, which has high nutrient concentrations. The observed salinity in the Bay of Bengal shows a strong north-south gradient with higher salinity in the southern part of the Bay. The supply of nutrients through fluvial input (that is, dominantly from the northern region) is insignificant. The enhanced chlorophyll-a concentration over the farthest station (0806) can be either due to Eddy mediated biological production or lateral advective transport of nutrients.

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The response of microzooplankton (20–200μm) to coastal upwelling and summer stratification in the southeastern Arabian Sea

Cited by 71 publications

References 47 publications

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

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

Seasonal variations in abundance, biomass and grazing rates of microzooplankton in a tropical monsoonal estuary

Evidence for enhanced chlorophyll-a levels in the Bay of Bengal during early north-east monsoon

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