Planktonic ciliate community structure and its distribution in the oxygen minimum zones in the Bay of Bengal (eastern Indian Ocean)

Wang, Chaofeng; Zhao, Yanchu; Du, Ping; Xiao, Ma; Li, Suheng; Li, Haibo; Zhang, Wuchang; Xiao, Tian

doi:10.1016/j.seares.2022.102311

Cited by 8 publications

(3 citation statements)

References 71 publications

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“…A stability in plankton dominance and abundance indicates that aquatic ecosystems have minimal fluctuation of biological parameters (Wang et al 2022). The stability of this aquatic ecosystem can also be caused by the shrimp cultivation standard applied, which is quite good and in accordance with the aquatic environment characteristics.…”

Section: Plankton Diversity and Abundancementioning

confidence: 97%

The dynamics of Chlorella spp. abundance and its relationship with water quality parameters in intensive shrimp ponds

2023

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Abstract. Soeprapto H, Ariadi H, Badrudin U. 2023. The dynamics of Chlorella spp. abundance and its relationship with water quality parameters in intensive shrimp ponds. Biodiversitas 24: 2919-2926. Chlorella spp. is a plankton genus belonging to the phylum Chlorophyta and is commonly found in the shrimp farming ponds. This plankton might serve as natural feed especially for the post-larvae stage shrimps. This study aims to investigate the dynamics of Chlorella spp. abundance and its correlation with the N:P ratio in the intensively managed shrimp ponds. The study was conducted using a causal ex-post facto design with data collection through purposive sampling. The results showed that the plankton abundance in the observed ponds was moderate consisted of 4 class and 7 genera. The dominant genus was Chroococcus spp. and Chlorella spp. with abundance ranging from 2.50E+05 to 2.60E+05 cells/mL. Plankton abundance correlated with water quality conditions, including pH of 7.9, salinity of 19-20‰, temperature of 28.50-28.75°C, dissolved oxygen of 5.12-5.39 mg/L, nitrite of 0.035-0.072 mg/L, phosphate of 0.011-0.025 mg/L, organic matter of 95.77-102.32 mg/L, and alkalinity of 125-130 mg/L. There was also correlation between the increase in plankton biomass and nutrient solubility. The abundance of Chlorella spp. was negatively correlated with the N:P ratio of the water in the ponds. Based on dynamic model analysis, the most ideal N:P ratio is 1:20 from several simulations of 1:10, 1:20, 1:30, and 1:40. The dynamics of Chlorella spp. abundance followed an oscillatory pattern from the beginning of cultivation to harvest with the most ideal N:P ratio of 1:20. This understanding is important for making environmental engineering concepts in pond aquatic ecosystems.

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Section: Plankton Diversity and Abundancementioning

confidence: 97%

The dynamics of Chlorella spp. abundance and its relationship with water quality parameters in intensive shrimp ponds

2023

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“…The derived findings showed that plankton mortality is beneficial to plankton survival in aquatic environments. For more detailed aspects, one can see [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Bifurcation Exploration and Controller Design in a Fractional Oxygen–Plankton Model with Delay

Zhang,

2024

Fractal Fract

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Fractional-order differential equations have been proved to have great practical application value in characterizing the dynamical peculiarity in biology. In this article, relying on earlier work, we formulate a new fractional oxygen–plankton model with delay. First of all, the features of the solutions of the fractional delayed oxygen–plankton model are explored. The judgment rules on non-negativeness, existence and uniqueness and the boundedness of the solution are established. Subsequently, the generation of bifurcation and stability of the model are dealt with. Delay-independent parameter criteria on bifurcation and stability are presented. Thirdly, a hybrid controller and an extended hybrid controller are designed to control the time of onset of bifurcation and stability domain of this model. The critical delay value is provided to display the bifurcation point. Last, software experiments are offered to support the acquired key outcomes. The established outcomes of this article are perfectly innovative and provide tremendous theoretical significance in balancing the oxygen density and the phytoplankton density in biology.

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“…Reports have shown decreases of one to three orders of magnitude from above to below the chlorophyll maximum in total ciliate abundance (e.g. Gomez, 2007; Pitta et al, 2000; Santoferrara et al, 2011; Tanaka and Rassoulzadegan, 2002; Wickham et al, 2011) and changes in species distribution based on the morphologically distinct tintinnids (Alder, 1999; Dolan et al, 2019; Wang et al, 2022). While light microscopy remains key in cell quantification, these analyses do not allow for accurate taxonomic classification of most (less conspicuous) ciliates, unless complex staining methods are used.…”

Section: Introductionmentioning

confidence: 99%

The photic‐aphotic divide is a strong ecological and evolutionary force determining the distribution of ciliates (Alveolata, Ciliophora) in the ocean

Santoferrara

Qureshi

Sher

et al. 2023

J Eukaryotic Microbiology

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The bulk of knowledge on marine ciliates is from shallow and/or sunlit waters. We studied ciliate diversity and distribution across epi‐ and mesopelagic oceanic waters, using DNA metabarcoding and phylogeny‐based metrics. We analyzed sequences of the 18S rRNA gene (V4 region) from 369 samples collected at 12 depths (0–1000 m) at the Bermuda Atlantic Time‐series Study site of the Sargasso Sea (North Atlantic) monthly for 3 years. The comprehensive depth and temporal resolutions analyzed led to three main findings. First, there was a gradual but significant decrease in alpha‐diversity (based on Faith's phylogenetic diversity index) from surface to 1000‐m waters. Second, multivariate analyses of beta‐diversity (based on UniFrac distances) indicate that ciliate assemblages change significantly from photic to aphotic waters, with a switch from Oligotrichea to Oligohymenophorea prevalence. Third, phylogenetic placement of sequence variants and clade‐level correlations (EPA‐ng and GAPPA algorithms) show Oligotrichea, Litostomatea, Prostomatea, and Phyllopharyngea as anti‐correlated with depth, while Oligohymenophorea (especially Apostomatia) have a direct relationship with depth. Two enigmatic environmental clades include either prevalent variants widely distributed in aphotic layers (the Oligohymenophorea OLIGO5) or subclades differentially distributed in photic versus aphotic waters (the Discotrichidae NASSO1). These results settle contradictory relationships between ciliate alpha‐diversity and depth reported before, suggest functional changes in ciliate assemblages from photic to aphotic waters (with the prevalence of algivory and mixotrophy vs. omnivory and parasitism, respectively), and indicate that contemporary taxon distributions in the vertical profile have been strongly influenced by evolutionary processes. Integration of DNA sequences with organismal data (microscopy, functional experiments) and development of databases that link these sources of information remain as major tasks to better understand ciliate diversity, ecological roles, and evolution in the ocean.

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Planktonic ciliate community structure and its distribution in the oxygen minimum zones in the Bay of Bengal (eastern Indian Ocean)

Cited by 8 publications

References 71 publications

The dynamics of Chlorella spp. abundance and its relationship with water quality parameters in intensive shrimp ponds

The dynamics of Chlorella spp. abundance and its relationship with water quality parameters in intensive shrimp ponds

Bifurcation Exploration and Controller Design in a Fractional Oxygen–Plankton Model with Delay

The photic‐aphotic divide is a strong ecological and evolutionary force determining the distribution of ciliates (Alveolata, Ciliophora) in the ocean

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