Vertical distribution of mesozooplankton in the central and eastern Arabian Sea during the winter monsoon

Padmavati, G.; Haridas, P.; Nair, K.K.C.; Gopalakrishnan, T.C.; Shiney, P.; Madhupratap, M.

doi:10.1093/plankt/20.2.343

Cited by 39 publications

(17 citation statements)

References 14 publications

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“…Our recent observation on insignificant DVM of the total chaetognath community in the oxygen-depleted water in the northeastern Arabian Sea, another important zone in TrE [33], further corroborate this view. Among the 25 species observed, eleven species were present throughout the water column in varying density, but only two of them performed significant DVM, which clearly opposes the general concept of DVM as a common phenomenon among zooplankton in this environment [34,35].…”

Section: Discussionmentioning

confidence: 89%

Plankton and the Invisible Barriers in the Tropical Ocean

Karati¹,

Vineetha²,

Tv³

et al. 2017

JAMB

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Diel vertical migration (DVM) is one of the major biological rhythms observed among zooplankton. In tropical environments (TrE), zooplankton is believed to exhibit prominent DVM. Chaetognath, a major vertical migrator among zooplankton in the global ocean, was studied from the Bay of Bengal, an important zone in TrE of Indian Ocean. Here a novel method (abundance-weighted tolerance index) was introduced which was successful in predicting the species, capable of performing DVM. The vertical profiles of physico-chemical variables exhibited a wide variation in upper 1000 m and only two species of the total twenty-five species exhibited significant DVM which opposed the general concept of DVM in TrE. The pronounced variations in physico-chemical variables acted as invisible barriers for zooplankton to perform DVM. The observed restricted DVM will have significant impact on the marine ecological processes including biological pump in the system.

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Section: Discussionmentioning

confidence: 89%

Plankton and the Invisible Barriers in the Tropical Ocean

Karati¹,

Vineetha²,

Tv³

et al. 2017

JAMB

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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: 95%

“…However, the data of the upper two layers (mixed layer and thermocline layer) were only considered for the present analysis, since it is well established that more than 90% of the MSP biomass in the Arabian Sea occurs with in the mixed and thermocline layers (Madhupratap et al, 1996a;Padmavati et al, 1998;Smith and Madhupratap, 2005). MSP samples collected during the daytime alone were considered for the present study so as to minimize the possible error in estimations due to upward migration of MSP with respect to the diminishing solar radiation.…”

Section: Mspmentioning

confidence: 99%

“…An analysis of major compositional change in MSP community showed less variation between the northern and southern regions of the EAS during monsoon periods (Madhupratap et al, 1996a;Padmavati et al, 1998). While swarms of salps and ostracods are common in north of 20°N during the late winter /early spring period (Paulinose and Aravindakshan, 1977;Ramaswamy et al, 2005), it has only minor impact on secondary production in the southern parts of the NEAS.…”

Section: Winter Monsoonmentioning

confidence: 99%

“…In the northern region, species belonging to the major copepod families follow their relative order of abundance; Paracalanidae (47%) > Clausocalanidae (20%) > Euchaetidae (11%) > Eucalanidae (10%) during the winter monsoon (Padmavati et al, 1998). In the southeastern Arabian Sea, copepod families follow their order of abundance: Paracalanidae (52%) > Eucalanidae (23.5%) > Acartiidae (10.5%) > Calanidae (10%) during the summer monsoon Madhupratap et al, 1996a).…”

Section: Winter Monsoonmentioning

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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Study of vertical distribution dynamics of zooplankton in a thermally stratified warm monomictic lake of Kashmir Himalaya

Yaseen

Bhat

2022

Ecohydrology

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In the present study, we investigated how stratification patterns and the related physico-chemical characteristics impact the vertical distribution of zooplankton community during the two consecutive stratifications in a warm monomictic lake (Manasbal Lake) in the Ganderbal area of Central Kashmir. Two consecutive events of stratification and deepening of thermocline recorded during the sampling period led to significant changes in the vertical distribution of zooplankton community.Physico-chemical characteristics displayed significant changes with the stratification pattern. Temperature of the surface water (0 m) increased gradually from 13 C to 29 C, resulting in a higher thermal gradient. pH and dissolved oxygen (O 2 ) displayed clinograde curves with vertical depth. Keratella cochlearis and Polyarthra vulgaris (Rotifers) were most dominant in terms of density and abundance at the thermocline and significantly decreased at the hypolimnion. Cladocera with significant difference along the vertical column showed an epilimnetic distribution with Ceriodaphnia reticulata and Ceriodaphnia quadriangularis being the major contributors. Among copepods, Cyclops viridis was recorded at all depths in greater dominance.Acanthodiaptomus denticornis (Diaptomidae) showed higher abundance from epilimnion to thermocline but decreased at hypolimnion. The results showed that the strong vertical gradient of environmental factors occurs in the Manasbal lake. Among them, dissolved oxygen, water temperature, and nutrients controlled the zooplankton community with higher aggregation above the thermocline. Therefore, the present investigation regarding the dynamic patterns of zooplankton community along the vertical gradient in a stratified lake could be important in monitoring habitats and to understand the ecology of warm monomictic lakes.

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Vertical distribution of mesozooplankton in the central and eastern Arabian Sea during the winter monsoon

Cited by 39 publications

References 14 publications

Plankton and the Invisible Barriers in the Tropical Ocean

Plankton and the Invisible Barriers in the Tropical Ocean

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

Study of vertical distribution dynamics of zooplankton in a thermally stratified warm monomictic lake of Kashmir Himalaya

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