Contrasting phytoplankton community structure and associated light absorption characteristics of the western Bay of Bengal

Pandi, S.; Kiran, Rayaprolu; Sarma, Nittala S.; Srikanth, A. S.; Sarma, V. V. S. S.; Krishna, M. S.; Bandyopadhyay, Debkumar; Prasad, Vandana; Acharyya, Tamoghna; Reddy, K. Gopala

doi:10.1007/s10236-013-0678-1

Cited by 27 publications

(19 citation statements)

References 60 publications

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“…In our culture experiment, we found significant negative correlations between a Ã ph ð440Þ, a Ã ph ð675Þ and Chla concentration of both phytoplankton species although neither were affected by non-phytoplankton particles (Figure 8), which were widely found in other studies (Bricaud et al 1995;McKee et al 2014;Pandi et al 2014;Yl€ ostalo et al 2014). Some field studies attributed the significant negative correlation to the package effects by non-phytoplankton particles (Bricaud et al 1995;Mill an-N uñez & Mill an-N uñez 2010).…”

Section: Discussionsupporting

confidence: 62%

“…The sizes of S. obliquus cells were 2.53, 2.19, and 1.64 times than that of M. aeruginosa at 15 C, 25 C, and 35 C, respectively, (p < 0.001; Figure 10). Therefore, the difference in a Ã ph ðλÞ can be partly attributed to the differences in cell size, which decreased a Ã ph ðλÞ with the increase of cell size (Fujiki & Taguchi 2002;Mill an-N uñez & Mill an-N uñez 2010;Ferreira et al 2013;Pandi et al 2014). In addition, the cell package effect was expected to be stronger when the cell size was larger than when cell size was smaller (Bricaud et al 2004;Uitz et al 2008).…”

Section: Discussionmentioning

confidence: 98%

“…The pigment packaging changes were also attributed to variations in phytoplankton size structure (Bricaud et al 2004). Field observations showed high a Ã ph ðλÞ were generally associated with nano-and picophytoplankton with smaller cell sizes (Ferreira et al 2013;Pandi et al 2014). Some studies even showed the phytoplankton cell diameter influenced development of a primary production model due to the differences in a Ã ph ðλÞ (Uitz et al 2008;Uitz et al 2010).…”

Section: Discussionmentioning

confidence: 99%

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Effects of temperature on the optical properties ofMicrocystis aeruginosaandScenedesmus obliquus

Yin

Zhang

Wang

et al. 2016

Journal of Freshwater Ecology

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Laboratory experiments were conducted to investigate the response of Microcystis aeruginosa and Scenedesmus obliquus to incubation at temperatures of 15 C, 25 C, and 35 C over 15 days. The relationships between chlorophyll a (Chla) concentration, phytoplankton density, and absorption coefficients, a ph (λ) and Chla-specific absorption coefficients, a Ã ph ðλÞ were determined. Multivariate linear models were developed that included the maximum photosynthetic efficiency of photosystem II F v /F m and Chla concentration, phytoplankton density, and a ph (λ), a Ã ph ðλÞ. The differences in a ph (λ) and a Ã ph ðλÞ between the two species and their responses to temperature were determined. At 25 C, the phytoplankton density and Chla concentration of both species increased gradually during the whole experiment. However, at 15 C, M. aeruginosa was inhibited by the low temperature and at 35 C the photosynthesis of S. obliquus was disrupted. For both species, phytoplankton density and Chla concentration had significant positive correlations with a ph (440) and a ph (675) at different temperatures, while there were significant negative correlations between Chla concentration and a

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Effects of temperature on the optical properties ofMicrocystis aeruginosaandScenedesmus obliquus

Yin

Zhang

Wang

et al. 2016

Journal of Freshwater Ecology

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“…The mean values of S NAP under different hydrological conditions (AP and NP) in this study were higher than that in Lake Erie (0.011 nm ‐1 ; Binding et al, ) but lower than that in the Pearl River Estuary (0.0136 nm ‐1 ; Wang et al, ). The mean S NAP value in the AP was slightly higher than that in the Liaohe River and coastal region along the northwestern Bay of Bengal (0.0122 nm ‐1 ; Pandi et al, ) but lower than that in Lake Taihu in the same season (Shao et al, ; Zhang, Zhang, et al, ). NAPs include both organic and inorganic particles, including relict bodies and degraded phytoplankton products (Zhang, Zhang, et al, ).…”

Section: Results and Analysismentioning

confidence: 95%

Seasonal dynamics of light absorption by suspended particulate matter and CDOM in highly turbid inland rivers on the Loess Plateau, China

Shao

Wang

Liang

et al. 2019

River Research & Apps

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The spectral characteristics of optically active constituents in water are key parameters in bio-optical modelling. Light absorption by phytoplankton [a ph (λ)], nonalgal particles (NAPs) [a NAP (λ)], and chromophoric dissolved organic matter (CDOM)[a CDOM (λ)] was investigated at 28 sites in the Wuding River (WDR) during the abundant river flow period (AP) in July 2017 and the normal river flow period (NP) in May 2018. The water quality parameters in the WDR substantially differed between the AP and NP. The dissolved organic carbon and turbidity were high in the NP, and chlorophyll a (Chl-a), total suspended matter (TSM), dissolved oxygen concentrations and electrical conductivity were low in the AP. a p (675) and Chl-a were more strongly correlated in the NP (r=0.96) than in the AP (r=0.41). a NAP (440) and a NAP (675) were strongly correlated with TSM (r=0.98 and 0.97) in the AP but weakly correlated in the NP. Moreover, a ph (λ) was positively correlated with Chl-a in both the AP and NP. In addition, a CDOM (440) was significantly correlated with Chl-a (r=0.62, p<.001) in the NP but not the AP. TSM was weakly correlated with a CDOM (440) in both the AP and NP. The S 275-295 values in the NP (0.0147-0.020 nm -1 ) were lower than those in the AP, demonstrating that the molecular weights were higher in the AP than in the NP. The photosynthetically active radiation absorption of most samples was dominated by the NAPs and CDOM, implying a crucial role in light attenuation in highly turbid inland rivers on the Loess Plateau.

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“…The eluent fractions obtained from XAD-8 and XAD-4 resin columns were scanned between 200 and 800 nm with an interval of 1 nm to obtain an absorption spectra using Shimadzu UV-visible 1800 double-beam spectrophotometer with 1 cm path length quartz cuvettes and Milli-Q water as reference. Since XAD fractions have significant absorbance above 700 nm, to maintain the uniformity, a null point correction was applied using absorbance at this wavelength 37,38 . Absorption coefficients were calculated using the equation…”

mentioning

confidence: 99%

Characterization of Humic Substances and their Distribution of XAD Fractions by Absorption Spectroscopy in the Godavari Estuary, India

Chari

Pandi

2017

Current Science

Self Cite

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Humic substances (HS) are formed in estuarine regions by biogeochemical processes of terrestrial and in situ produced organic matters. Their structure and distribution may vary seasonally and spatially. To examine this, HS were isolated from Godavari estuarine waters using ion-exchange resins XAD-8 followed by XAD-4 during 2014-2015. The structural differences between the two fractions were characterized by E 2 /E 3 ratio (a 250 /a 365 ), spectral slope (S 275-295 ), and spectral slope ratio (S R , S 275-295 /S 350-400 ), which were derived from UV-visible absorbance spectra. Lower values of E 2 /E 3 ratio, S 275-295 and S R for XAD-8 fractions than XAD-4, indicate higher aromaticity and higher molecular weight of dissolved organic compounds retained on the former resin. The E 2 /E 3 ratio for XAD-8 and S R for XAD-4 fractions were found to decrease gradually from post-monsoon to monsoon, indicating that the biological process controls the production of organic matter in upstream waters. Lower molecular weight organic compounds formed by bacterial decay and photodegradation during pre-monsoon and higher molecular weight organic compounds formed during the post-monsoon season was attributed to the freshly exudated organic matter from phytoplanktons dominated at the mouth of the estuary.

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Contrasting phytoplankton community structure and associated light absorption characteristics of the western Bay of Bengal

Cited by 27 publications

References 60 publications

Effects of temperature on the optical properties ofMicrocystis aeruginosaandScenedesmus obliquus

Effects of temperature on the optical properties ofMicrocystis aeruginosaandScenedesmus obliquus

Seasonal dynamics of light absorption by suspended particulate matter and CDOM in highly turbid inland rivers on the Loess Plateau, China

Characterization of Humic Substances and their Distribution of XAD Fractions by Absorption Spectroscopy in the Godavari Estuary, India

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