Hydrobiological responses of the North Eastern Arabian Sea during late winter and early spring inter-monsoons and the repercussions on open ocean blooms

Padmakumar, K. B.; Thomas, Lathika Cicily; VimalKumar, K.G.; Devi, C.R. Asha; Maneesh, T. P.; Vijayan, Anil Kumar; Gupta, G.V.M.; Sudhakar, M.

doi:10.1017/s0025315416000795

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…The coastal and open waters of the Arabian Sea are known for the dominance of chainforming diatoms during the SIM. These include Bacillaria sp., Thalassiosira sp., Chaetoceros sp., and Rhizosolenia sp (Sawant and Madhupratap, 1996;Padmakumar et al, 2017). The LC (tintinnids) prey selection depends on the oral diameter of their lorica (4 times of the prey) and can feed on the size range of 2 to 20 µm (Dolan et.al 2002;.…”

Section: Discussionmentioning

confidence: 99%

A study on microzooplankton community from the coastal waters of eastern Arabian Sea: emphasis on the dominance of heterotrophic dinoflagellates

Elangovan

Gauns

2023

Environ Monit Assess

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We studied the community composition of microzooplankton (MZP) from the surface waters off Candolim, Goa. The MZP communities were examined for the year 2013, covering different seasons and four stations (Near-shore: G3 & G4, offshore: G5 & G6). A total of 30 species belonging to 24 genera were recorded, which include loricate ciliates (LC: 14 species of 13 genera), aloricate ciliates (ALC: 5 species of 3 genera), heterotrophic dino agellates (HDS: 11 species of 8 genera) and copepod nauplii. The MZP abundance in the coastal waters varied spatially irrespective of different seasons, with higher abundance in the offshore stations (G5 & G6, 38-127 cells L-1) and lower abundance in the near-shore stations (G3 & G4, 20-97 cells L-1). The MZP community composition showed the dominance of HDS (16-85%) in the near-shore stations during most of the seasons and inferiority during NEM (16-18%,). Moreover, all the coastal waters (near and offshore) were dominated by HDS (58-85%) during spring inter-monsoon.The dominant species of HDS were Dinophysis apicata, Dinophysis caudata, Porocentrum micans, Protoperidinium breve, Protoperidinium latistriatum, and Protoperidinium granii. The statistical analysis (Spearman's rank correlation) depicts that the MZP abundance and community composition were mainly controlled by salinity (r = 0.4-0.7). Whereas the dominance of HDS in the coastal waters could be the reason for its mixotrophic nature and diverse feeding mechanism. Thus, a strong positive correlation between the HDS and LC (r = 0.73-0.92) showed the feeding ability of HDS in their relative community.

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Section: Discussionmentioning

confidence: 99%

A study on microzooplankton community from the coastal waters of eastern Arabian Sea: emphasis on the dominance of heterotrophic dinoflagellates

Elangovan

Gauns

2023

Environ Monit Assess

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“…In earlier studies, the phytoplankton composition from the same region is well reported with the chain‐forming species such as Chaetoceros sp., Thalassiosira sp., Rhizosolenia sp., and Bacillaria sp. being most dominant (up to 90%) in the coastal and open ocean of the Arabian Sea during the intermonsoon season (Devi et al, ; Padmakumar et al, ; Sawant & Madhupratap, ). MZP are known to feed on suspended detritus and its associated bacterial microflora (Moritz, Montagnes, Carleton, Wilson, & Mckinnon, ).…”

Section: Discussionmentioning

confidence: 99%

“…and Bacillaria sp. being most dominant (up to 90%) in the coastal and open ocean of the Arabian Sea during the intermonsoon season (Devi et al, 2010;Padmakumar et al, 2017;Sawant & Madhupratap, 1996). MZP are known to feed on suspended detritus and its associated bacterial microflora (Moritz, Montagnes, Carleton, Wilson, & Mckinnon, 2006).…”

Section: Discussionmentioning

confidence: 99%

Spatial variability of microzooplankton in the central Arabian Sea during spring intermonsoon

et al. 2018

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Spatial variability of microzooplankton (MZP; organisms in size 20–200 μm) along with total heterotrophic bacteria (THB) and picophytoplankton in the upper 120‐m water column of the central Arabian Sea (AS) was studied during the spring intermonsoon period (March 2015). Six stations divided into three regions (northern, southern, and central) were sampled along 68°E transect, between 9°N and 21°N. A total of 25 species of MZP were recorded corresponding to loricate ciliates (11 species), aloricate ciliates (two species), and heterotrophic dinoflagellates (12 species). Along the transect, MZP total abundance that varied between 5 and 9 × 103 org./m3 was largely contributed by ciliates, especially loricate ciliates (30%–62%) followed by heterotrophic dinoflagellates (23%–26%). MZP counts were lower in the central region (SD ± 0.4, 7–8 × 103 org./m3) than in the northern and the southern regions (SD ± 0.7, 8–9 × 103 org./m3) of the Arabian Sea. Heterotrophic bacterial counts were higher in the northern (28–202 × 103 cells/ml) and southern (16–92 × 103 cells/ml) and lowest in the central (13–89 × 103 cells/ml) region. In contrast, picophytoplankton showed higher counts in central (3–54 × 103 cells/ml) and southern (4–113 × 103 cells/ml) regions and lowest in the north (1–45 × 103 cells/ml). Strong positive coupling of MZP–THB (0.05 > p > 0.01) than that of MZP–picophytoplankton density and MZP–chlorophyll a concentration suggests the spatial scale variability and functioning of microbial loop in the central Arabian Sea during the spring intermonsoon period.

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“…Diatoms (Bacillariophyceae) are generally considered to be better adapted to lower temperatures than are other algae [ 1 ]. They are usually prevalent in spring in subtropical water bodies [ 2 , 3 , 4 , 5 ]. Relatively low temperatures in spring are suitable for the growth of many diatom species [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Species-Specific Responses of Freshwater Diatoms to Elevated Temperatures Are Affected by Interspecific Interactions

et al. 2018

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Numerous experimental simulations with different warming scenarios have been conducted to predict how algae will respond to warming, but their conclusions are sometimes contradictory to each other. This might be due to a failure to consider interspecific interactions. In this study, the dominant diatom species in a seasonal succession were isolated and verified to adapt to different temperature ranges by constant temperature experiment. Both unialgal and mixed cultures were exposed to two fluctuant temperature treatments that simulated the temperature variations from early spring to summer, with one treatment 4 °C higher (warming scenario) than the other. We found that the specific response of diatoms to warming was affected by interspecific interactions. Spring warming had no significant effect on eurythermal species and had a positive effect on the abundance of warm-adapted diatom species, but interspecific interactions reduced this promotional effect. Cold-adapted species had a negative response to spring warming in the presence of other diatom species but had a positive response to early spring warming in the absence of interspecific interactions. In addition, warming resulted in the growth of all diatom species peaking earlier in unialgal cultures, but this effect could be weakened or amplified by interspecies interactions in mixed cultures. Our results suggest that the specific diatom species with different optimal growth temperature ranges responding to warming were expected if there were no interspecific interactions. However, in natural environments, the inevitable and complex interspecific interactions will influence the responses of diatoms to warming. This important factor should not be ignored in the prediction of organism responses to climate warming.

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Hydrobiological responses of the North Eastern Arabian Sea during late winter and early spring inter-monsoons and the repercussions on open ocean blooms

Cited by 16 publications

References 26 publications

A study on microzooplankton community from the coastal waters of eastern Arabian Sea: emphasis on the dominance of heterotrophic dinoflagellates

A study on microzooplankton community from the coastal waters of eastern Arabian Sea: emphasis on the dominance of heterotrophic dinoflagellates

Spatial variability of microzooplankton in the central Arabian Sea during spring intermonsoon

The Species-Specific Responses of Freshwater Diatoms to Elevated Temperatures Are Affected by Interspecific Interactions

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