Artykuły w czasopismach na temat „Phytoplankton”
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Suardiani, Ni Kadek, I. Wayan Arthana i Gde Raka Angga Kartika. "Produktivitas Primer Fitoplankton pada Daerah Penangkapan Ikan di Taman Wisata Alam Danau Buyan, Buleleng, Bali". Current Trends in Aquatic Science 1, nr 1 (30.08.2018): 8. http://dx.doi.org/10.24843/ctas.2018.v01.i01.p02.
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This research aims to identify productivity value of phytoplankton’s net primary as well as its relation within parameter of physics, chemistry, and aquatic biology to the productivity value of phytoplankton’s net primary in the waters of Lake Buyan Nature Park. Measurement of primary phytoplankton productivity is conducted by using bright and dark bottle method. The taking of lake water samples for measurement of phytoplankton primary productivity and measurement of supporting parameters namely physics (temperature, brightness, turbidity), chemistry (pH, nitrate, phosphate) and biology (phytoplankton abundance) were carried out at four research stations in the fishing area. Data analysis used in this research is correlation analysis among parameters of physic, chemistry, and aquatic biology to the net primary productivity value of phytoplankton by using the PAST 3.1 application. The obtained result showed that the value of net primary productivity ranged from 76.39 to 211.46 mgC / m3 / day and the parameters of physics, chemistry and aquatic biology have a relationship with net primary productivity of phytoplankton. Brightness, abundance of phytoplankton, nitrate, temperature, dissolved oxygen, pH and phosphate which are positively correlated with net primary productivity of phytoplankton while water turbidity is negatively correlated with it. Parameters that have a strong to very strong relationship with net primary productivity are dissolved oxygen, temperature, nitrate, phytoplankton abundance, and water brightness.
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Carvalho, Wanderson Fernandes de, i Eliane Gonzalez Rodriguez. "Development of primary and bacterial productivity in upwelling waters of Arraial do Cabo region, RJ (Brazil)". Brazilian Journal of Oceanography 52, nr 1 (marzec 2004): 35–45. http://dx.doi.org/10.1590/s1679-87592004000100004.
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A relationship between phytoplankton and bacterioplankton has been observed in a laboratory experiment, simulating partial and complete upwelling conditions. Primary and bacterial productivity presented a similar pattern, with a three-stage development (growth, peak and decline in production). However, bacterial development stages did not occur simultaneously with the phytoplanktonic development, that is, the highest bacterial production rates occurred in the stages of growth and decline of the primary production, whilst the lowest values of bacterial productivity were simultaneous to the highest phytoplanktonic production stage. Analysis of data obtained in this experiment shows a close relationship between phytoplankton and bacteria, in which these organisms might be competing for inorganic nutrients in some moments, and bacteria might have, as an important source of carbon, the particulate or dissolved organic matter coming from the phytoplankton. Besides that, bacteria might play an important role in the initial stages of phytoplankton blooms, when they might be one of the main conditioning agents of the waters that have just upwelled, allowing the plain phytoplanktonic development.
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Jahan, Sarwat. "The Role of Phytoplanktons in the Environment and in Human Life, a Review". BASRA JOURNAL OF SCIENCE 41, nr 2 (1.07.2023): 392–411. http://dx.doi.org/10.29072/basjs.20230212.
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Phytoplankton is microscopic organisms that lie in watery environment and make their own food from sunlight through photosynthesis. Phytoplanktons are the core producers and major role play to the food web. They produce the similar amount of biomass of CO2 as all terrestrial plants combined. Several environmental factors, many of which are currently undergoing significant changes as a result of human-caused global warming, control phytoplankton productivity. Generally, ocean ecosystem is based on phytoplankton. It contributes about half of the world’s primary production, and diverse phytoplankton taxa play distinctive roles in the earth biogeochemical cycles, biological pump, ocean food chain, bioindicator, food industry and drugs. In the present paper an effort has been made to give broad review of literature on phytoplankton. This review clearly indicates that such research is necessary and emphasis the urgency of present work. The recent review highlights the value of phytoplankton in our lives and environment.
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Lürling, Miquel. "Grazing resistance in phytoplankton". Hydrobiologia 848, nr 1 (11.08.2020): 237–49. http://dx.doi.org/10.1007/s10750-020-04370-3.
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AbstractPhytoplankton is confronted with a variable assemblage of zooplankton grazers that create a strong selection pressure for traits that reduce mortality. Phytoplankton is, however, also challenged to remain suspended and to acquire sufficient resources for growth. Consequently, phytoplanktic organisms have evolved a variety of strategies to survive in a variable environment. An overview is presented of the various phytoplankton defense strategies, and costs and benefits of phytoplankton defenses with a zooming in on grazer-induced colony formation. The trade-off between phytoplankton competitive abilities and defenses against grazing favor adaptive trait changes—rapid evolution and phenotypic plasticity—that have the potential to influence population and community dynamics, as exemplified by controlled chemostat experiments. An interspecific defense–growth trade-off could explain seasonal shifts in the species composition of an in situ phytoplankton community yielding defense and growth rate as key traits of the phytoplankton. The importance of grazing and protection against grazing in shaping the phytoplankton community structure should not be underestimated. The trade-offs between nutrient acquisition, remaining suspended, and grazing resistance generate the dynamic phytoplankton community composition.
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Sandi, Phyo, Thida Khaing, Kay Thi Nyunt, Nwe Nwe Soe Hlaing, Aye Aye Khaing i Nandar Aye Winn. "Primary Checklist of Phytoplankton Genera in Sunye Lake, Mandalay Region, Myanmar". Asian Journal of Environment & Ecology 23, nr 8 (6.07.2024): 1–10. http://dx.doi.org/10.9734/ajee/2024/v23i8579.
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Phytoplankton are the foundation of food webs and the most important producer in aquatic ecosystems. They can photosynthesize and convert light energy into organic energy. They are a secrete ingredients used as a bioindicator of water quality and pollution. This study investigated composition of phytoplankton in freshwater body of Sunye lake, Mandalay region. The study was conducted one year from January 2020 to December 2020. According to the study, out of 47 total algal genera; Chlorophyceae (14 genera), Baciliophyceae (11 genera); Cyonophyceae (nine genera); Zygnematophyceae (two genera), Euglenophyceae (one genera) and Conjugatophyceae (one genera) were recorded. In this study, among total genera of 37, the class of Chlorophyceae (45%) is the largest group followed by (28%), Bacillariophyceae Cyanophyceae (19%), Zygnematophyceae (4%), Euglenophyceae (2%) and Conjugatophyceae (2%). This present check list study will be useful base line data for further study of phytoplankton in the lake. Aims: The aim of study is to record and give the information’s of phytoplankton existence and useful data for further study and lake ecosystem. Study Design: The water sample was collected monthly early morning once a week throughout the study period. Place and Duration of Study: These sample were collected from natural freshwater Sunye lake during January 2020 to December 2020 for one year period. Methodology: Phytoplankton samples were taken by filtering through 25 µm mesh plankton net and preserved with a Lugol‘s solution and kept in refrigerator for further study. The sample was identified and took photograph by using the microscope (OPTIKA). The results of phytoplanktons were checked with phytoplankton identification key, taxonomic database site. Results: In the present study, 47 genera belong to the six different classes of phytoplanktons were recorded Chlorophyceae, Bacillariophyceae, Cyanophyceae, Zygnematophyceae, Euglenophyceae, Conjugatophyceae. Conclusion: The current study is first time to study the checklist of phytoplankton in Sunye Lake and should be continuously study to update the checklist data of phytoplankton genera and seasonally abundance which is important indicators of lake ecosystem.
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Tandon, Praveen Kumar, i Neelam Shukla. "A STUDY ON PHYTOPLANKTON DIVERSITY IN RIVER GANGA AT ALLAHABAD, UTTAR PRADESH (INDIA)". Green Chemistry & Technology Letters 1, nr 01 (7.01.2016): 92–95. http://dx.doi.org/10.18510/gctl.2015.1115.
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Presence of microscopic algae can cause taste and odour problems, water discoloration, or form large mats that can interfere with boating, swimming, and fishing. The present study was conducted to assess the phytoplankton assemblages which in turn can serve as a suitable method to assess the quality of river ecosystem. Diversity of phytoplankton in river Ganga in Allahabad at five sampling stations was conducted from March to April 2014. Plankton identified in the river mainly composed of the members of Bacillariophyceae, Chlorophyceae and Cyanophyceae families.The Palmer pollution index values were calculated to know the level of organic pollution and to support the data. On the basis of quantitative and qualitative estimates 15 significant algal species were identified which can tolerate high degree of pollution. The abundance of phytoplanktons in april was greater than in march. Abundance of phytoplanktons and algal bloom was maximum at Chhatnag ghat whereas at Sangam low phytoplankton diversity was found.In general, moderate temperature, low current velocity and high transparency of water appear to be better the conditions for algal growth in the river Ganga. These findings highlighted the deterioration of water quality of the river due to industrial, commercial and anthropogenic activities. The status of phytoplankton diversity of river Ganga was quite low indicating that the river is highly polluted.
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Indrayani, Ervina, Lisiard Dimara, Kalvin Paiki i Felix Reba. "The Analysis of Phytoplankton Abundance Using Weibull Distribution (A Case Study in the Coastal Area of East Yapen in the Regency of Yapen Islands, Papua)". Journal of Education and Learning 7, nr 3 (25.03.2018): 251. http://dx.doi.org/10.5539/jel.v7n3p251.
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The coastal waters of East Yapen is one of the spawning sites and areas of care for marine biota in Papua. Because of its very open location, it is widely used by human activities such as fishing, residential, industrial and cruise lines. This indirectly affects the balance of coastal waters condition of East Yapen that impact on the existence of marine biota, especially phytoplankton. Phytoplanktons have a very important role because phytoplankton is the primary producer in the food chain as a link to higher tropical levels. Therefore, special studies are needed such as looking at the distribution of phytoplankton abundance at each site. The data analysis uses the American Public Health Association (APHA), Geo-statistical data, and Chi Square. Then, the distribution parameters are estimated using the Maximum Likelihood Estimation (MLE) method.The obtained parameters are used to describe the cumulative probability and survival of phytoplankton distribution. Samples are taken from fifteen sampling points. The form parameter of the phytoplankton abundance data is 3.9844 and the scale parameter is 79.929. So phytoplankton is the most widely spread in the 15th location, followed by the 6th location. While phytoplankton is at least in the 8th location.The results showthat the highest phytoplankton abundance composition is Bacillariophyceae (50%) and the lowest is Phyrrophyceae (9%) and Cyanophceae. The research is expected to provide an overview of the fertility rate of East Yapen Coastal Waters in particular and Yapen Islands regency in general.
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He, Yike, Zuoyi Chen, Xin Feng, Guangyi Wang, Gang Wang i Jiabo Zhang. "Daily Samples Revealing Shift in Phytoplankton Community and Its Environmental Drivers during Summer in Qinhuangdao Coastal Area, China". Water 14, nr 10 (18.05.2022): 1625. http://dx.doi.org/10.3390/w14101625.
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Rapid urbanization and economic development in coastal regions have significantly increased coastal nutrient pollution and remarkably changed the phytoplankton community and developed some species into bloom, resulting in large economic losses and serious threats to public health. Therefore, it is indispensable to reveal the shift in the phytoplankton community and phytoplankton abundance, and phytoplankton’s environmental drivers. However, previous studies could not present the details of the environmental drivers of phytoplankton due to samples being collected with low temporal resolution. Here, high-temporal-resolution (daily) samples were collected to investigate the influence of environmental factors on phytoplankton in Qinhuangdao for 44 days. Phytoplankton communities showed a rapid succession, with predominant genera changing in the order Skeletonema–Chaetoceros–Skeletonema–Thalassiosira. Similarly, Thalassiosira pacifica, Skeletonema costatum, Chaetoceros tortissimus, and Chattonella marina were identified as the dominant species and were abundant in 0–1.27 × 107 cells·L−1, 0–9.34 × 106 cells·L−1, 0–6.49 × 106 cells·L−1, and 0–3.64 × 106 cells·L−1, respectively. Moreover, inflows facilitate the rapid succession of the phytoplankton community. Dissolved inorganic phosphorus (DIP) was found to remarkably influence the succession of phytoplankton communities and the bloom of the top three dominant species, i.e., Thalassiosira pacifica, Skeletonema costatum, and Chaetoceros tortissimus. Overall, our results provide high-temporal-resolution observations of phytoplankton community succession and reveal its environmental drivers. This contributes to our current understanding of the occurrence of algae blooms and supports the development of management strategies to control algae bloom in coastal waters.
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Coupel, P., H. Y. Jin, M. Joo, R. Horner, H. A. Bouvet, M. A. Sicre, J. C. Gascard, J. F. Chen, V. Garçon i D. Ruiz-Pino. "Phytoplankton distribution in unusually low sea ice cover over the Pacific Arctic". Biogeosciences 9, nr 11 (26.11.2012): 4835–50. http://dx.doi.org/10.5194/bg-9-4835-2012.
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Abstract. A large part of the Pacific Arctic basin experiences ice-free conditions in summer as a result of sea ice cover steadily decreasing over the last decades. To evaluate the impact of sea ice retreat on the marine ecosystem, phytoplankton in situ observations were acquired over the Chukchi shelf and the Canadian basin in 2008, a year of high melting. Pigment analyses and taxonomy enumerations were used to characterise the distribution of main phytoplanktonic groups. Marked spatial variability of the phytoplankton distribution was observed in summer 2008. Comparison of eight phytoplankton functional groups and 3 size-classes (pico-, nano- and micro-phytoplankton) also showed significant differences in abundance, biomass and distribution between summer of low ice cover (2008) and heavy ice summer (1994). Environmental parameters such as freshening, stratification, light and nutrient availability are discussed as possible causes to explain the observed differences in phytoplankton community structure between 1994 and 2008.
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García-Prieto, Juan Carlos, Francisco Javier Burguillo Muñoz, Manuel G. Roig i José Bernardo Proal-Najera. "Prediction of Phytoplankton Biomass in Small Rivers of Central Spain by Data Mining Method of Partial Least-Squares Regression". Proceedings 48, nr 1 (12.11.2019): 16. http://dx.doi.org/10.3390/ecws-4-06427.
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The Water Framework Directive (WFD, EC, 2000) states that the “good” ecological status of natural water bodies must be based on their chemical, hydromorphological and biological features, especially under drastic conditions of floods or droughts. Phytoplankton is considered a good environmental bioindicator (WFD) and climate change has a strong impact on phytoplankton communities and water quality. The development of robust techniques to predict and control phytoplankton growth is still in progress. The aim of this study is to analyze the impact of the different stressors associated with the change in phytoplanktonic communities in small rivers in the center of the Iberian Peninsula (Southwestern Europe). A statistical study on the identification of the essential limiting variables in the phytoplankton growth and its seasonal variation by climate change was carried out. In this study, a new method based on the partial least-squares (PLS) regression technique has been used to predict the concentration of phytoplankton and cyanophytes from 22 variables usually monitored in rivers. The predictive models have shown a good agreement between training and test data sets in rivers and seasons (dry and wet). The phytoplankton in dry periods showed greatest similarities, these dry periods being the most important factor in the phytoplankton proliferation
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Aguirre, Néstor, Bernd Werding i Jaime Palacio. "The nitrogen/phosphorus and the succession of phytoplankton in two lakes located in the alluvial prairie of main river in Germany". Revista Facultad de Ingeniería Universidad de Antioquia, nr 38 (3.08.2006): 136–45. http://dx.doi.org/10.17533/udea.redin.343284.
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Variation in seasonal nitrogen/phosphorus ratio and phytoplankton community succession were compared between March and November 1997 in a lake directly connected to the Main River and in another lake without direct connection. Results showed a massive growth of Cyanophyta during summer in association with low N/P ratios (10-5:1), whereas Crysophyta and Chlorophyta abundance was accompanied by high N/P ratios (50-20:1). Evidences suggest that composition and structure of the phytoplankton community are related to phosphorus and nitrogen availability, and also contributes to the appearance of new phytoplanktonic species. However phytoplanktonic community succession were more correlated with the dominance degree of some species.
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Rahi, Md Lifat, Sarower E. Mahfuj, Sk Shahinur Islam, S. Saiful Islam i Wasim Sabbir. "Assessment of the abundance and species composition of Phytoplankton of Moiur river, Khulna". Journal of Bio-Science 21 (11.03.2015): 27–34. http://dx.doi.org/10.3329/jbs.v21i0.22516.
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Context: Phytoplanktonic community structure in an aquatic body embodies the energy transfer through this phase and indicates the tropic status. Objectives: The present study was conducted to assess the phytoplankton abundance and species composition of Mouri River, Khulna, Bangladesh. Materials and Methods: Water samples were collected from six different stations once in a week for a period of 6 months (February- July) 2010. Results: In total 48 different species of 23 genus and 4 families were identified. Phytoplankton abundance varied from 805 to 1788 individuals/L in different stations. The highest abundance was observed for the family chlorophyceae that constituted 27-50.56% of the total phytoplankton biomass throughout the river. Highest number of phytoplankton species (22) was also recorded for the family chlorophyceae. The most diverse genus was Navicula (6). Some aspects of the water quality parameters were measured by regression analysis and significant correlations were also observed between water quality parameters and phytoplankton abundance. Water temperature, pH, DO, Free CO2, alkalinity, hardness, calcium and magnesium showed positive correlations with total phytoplankton abundance where as transparency, TDS, TSS, sulfate phosphate and nitrite showed negative correlations. Conclusion: In most of the cases, phytoplankton abundance and water quality parameters showed greater deviation from the optimum level. However, the results of the present experiment confirmed the polluted water of the river. DOI: http://dx.doi.org/10.3329/jbs.v21i0.22516 J. bio-sci. 21: 27-34, 2013
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Tonetta, D., R. Laudares-Silva i MM Petrucio. "Planktonic production and respiration in a subtropical lake dominated by Cyanobacteria". Brazilian Journal of Biology 75, nr 2 (maj 2015): 460–70. http://dx.doi.org/10.1590/1519-6984.17513.
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Planktonic primary production and respiration rates were estimated in a subtropical coastal lake dominated by Cyanobacteria in order to investigate the temporal and vertical variation in this lake and to evaluate its relationships with limnological variables and phytoplankton. Light and dark bottles were incubated at four different depths in the central part of the lake and were performed bimonthly from June/2009 to December/2010. No significant difference was evident among depths in relation to phytoplankton, limnological variables and metabolic rates. However, the highest production rates were recorded at the surface, and decreased towards the bottom, coupled with phytoplanktonic photosynthetic capacity. Wind induced mixing in Peri Lake played an important role in nutrient and phytoplankton redistribution, characterizing this lake as polymictic. According to density and biovolume, the phytoplankton community was dominated by filamentous Cyanobacteria, especially Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba-Raju. This study has shown that both water temperature and nutrient availability drive phytoplankton growth and consequently the temporal variation in metabolic rates, where respiration is higher than primary production.
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Desmit, X., J. P. Vanderborght, P. Regnier i R. Wollast. "Control of phytoplankton production by physical forcing in a strongly tidal, well-mixed estuary". Biogeosciences Discussions 2, nr 1 (14.01.2005): 37–75. http://dx.doi.org/10.5194/bgd-2-37-2005.
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Abstract. A model for phytoplanktonic production in turbid, macro-tidal estuaries is proposed. It is based on the description of light-dependent algal growth, phytoplankton respiration and mortality. The model is forced by solar irradiance, mixing depth and light penetration. The extinction coefficient is directly related to the dynamics of suspended particulate matter. Model results show that the description of phytoplankton growth must operate at a time resolution sufficiently high to describe the interference between solarly and tidally driven physical forcing functions. It also demonstrates that in tidal and turbid estuaries, the short-term variation of the euphotic depth to mixing depth ratio has to be resolved for production estimates and that net positive phytoplankton production can be achieved in areas of high turbidity. The model is used to explain the typical phytoplankton decay observed along the longitudinal gradient of salinity in turbid estuaries, using the Western Scheldt as an example.
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Bhuiyan, M. A. H., M. Mohid, S. N. Choytee, M. R. Islam, A. Rahaman, M. Nahin i M. Khondker. "Phytoplankton as New Taxa and Report for Bangladesh". Journal of Biodiversity Conservation and Bioresource Management 10, nr 1 (30.06.2024): 91–98. http://dx.doi.org/10.3329/jbcbm.v10i1.74606.
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In the present paper, a total of 12 species of phytoplankton have been described of which one new variety (Pediastrum duplex var. reniformae var. nov.) and one new forma (Pediastrum duplex var. gracillimum fa. rotatus fa. nov.) from the phytoplankton have been described as new to science. The other 10 species of phytoplanktons have been described as new report from Bangladesh. The systematic account for each of the above-mentioned species and their taxonomic position and photomicrographs are elaborated. Biodivers. Conserv. Bioresour. Manag. 2024, 10(1): 91-98
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Wang, B., C. Q. Liu, X. Peng, F. Wang i C. Chen. "Stable carbon isotope as a proxy for the change of phytoplankton community structure in cascade reservoirs from Wujiang River, China". Biogeosciences Discussions 8, nr 1 (31.01.2011): 831–56. http://dx.doi.org/10.5194/bgd-8-831-2011.
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Abstract. Phytoplankton community structure and δ13C of dissolved inorganic carbon (DIC), particulate organic carbon (POC), and phytoplanktonic carbon (PPC), and the related hydro-chemical parameters have been seasonally investigated in the cascade reservoirs from the Wujiang River Basin. Average values of δ13CDIC, δ13CPOC and δ13CPPC were −8.1±1.3‰, −29.6±2.8‰, and −30.9±4.5‰, respectively. Seasonal fluctuation of δ13CPPC was comparable to that of δ13CPOC and larger than that of δ13CDIC. The δ13CPPC values showed a significant linear correlation with δ13CPOC, indicating that endogenetic phytoplankton is the main source of POC in these cascade reservoirs. Compared to environmental factors such as temperature, taxonomic differences are the main factor influencing δ13CPPC in this study. As a result, the contribution of Bacillariophyta to the total phytoplankton showed a significant negative correlation with δ13CPPC and Δδ13C (δ13CPPC−δ13CDIC), respectively, suggesting that δ13CPPC can be used to discern the change of phytoplankton community structure although only two kinds of dominant algae (i.e. Bacillariophyta and Chlorophyta) facilitate achieving this relationship. This relationship will have an important significance in understanding evolvement of phytoplankton community structure with time using geochemical technique once it is confirmed at a larger scale in field study.
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Yuan, Menglin, Cuiling Jiang, Xi Weng i Manxue Zhang. "Influence of Salinity Gradient Changes on Phytoplankton Growth Caused by Sluice Construction in Yongjiang River Estuary Area". Water 12, nr 9 (7.09.2020): 2492. http://dx.doi.org/10.3390/w12092492.
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Though the number of sluices and dams in coastal areas has increased rapidly in recent years, the influence of their construction on phytoplankton in estuary areas is hardly known. This paper aims to provide a reference for quantitative research on the ecological influence of sluice construction and give ecological justifications for the setting of environmental standards in the estuary areas. The survey data gained at the lower reach of the Yongjiang River and its estuarine areas in June 2015 were used in MIKE21 software (Danish Hydraulic Institute (DHI), Denmark)) for establishing a two-dimensional numerical model to simulate the salinity field distribution after sluice construction. Based on the simulation results, the salinity gradient changes caused by the construction were analyzed. The one-dimensional Gaussian model was applied to calculated the phytoplankton’s ecological threshold interval over the salinity changes, which helped predict the influence of salinity changes on phytoplankton cell density. The study shows that salinity in the Yongjiang estuary increases obviously, beyond the phytoplankton ecological threshold, after sluice construction without water discharge. Salinity will become a restriction factor to phytoplankton growth after sluice construction in the study area, which may cause a sharp decrease of certain phytoplankton species.
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Abubakar, F. B., A. Salisu, B. D. Yakasai, A. Sani, M. M. Namadina i A. Kamal. "Determination of phytoplankton species in the Stomach of Tilapia Fish (<i>Oreochromis niloticus</i> L.)". Dutse Journal of Pure and Applied Sciences 10, nr 2b (17.07.2024): 40–44. http://dx.doi.org/10.4314/dujopas.v10i2b.4.
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The condition of a fish pond's physiochemical parameters determines whether it is artificial or natural. One of the most significant tropical and subtropical freshwater fish is the tilapia (Oreochromis niloticus L.), which can eat both tiny zooplankton and phytoplankton. The purpose of this investigation was to determine the phytoplankton species found in the stomach and gut of tilapia (Oreochromis niloticus L.). Based on the physical traits of the phytoplankton species, fishpond waters, fish guts, and fish stomachs were identified using established procedures. The conventional techniques were employed to measure the physicochemical characteristics. Cyanophyceae and Chlorophyceae made up the majority of the phytoplankton that was discovered in the stomach, gut, and pond waters. Anabaena and Microcystis, two potentially poisonous cyanophyta species, were the most significant and prevalent phytoplankton species discovered in the intestines of tilapia. The study area's fish pond water had physicochemical parameter values of 26.3 o/oo for salinity, 7.1 for pH, 6.3 mg/L for dissolved oxygen, and 27.4°C for temperature. The study's findings may be applied to the biomanipulation of bothersome phytoplankton blooms in pond environments. The variation in the gut and stomach phytoplanktons of Tilapia fish was thus shown by the current preliminary investigation, which may be helpful in the creation of probiotics, medications, and industrial enzyme production. The pond under study was steady and appropriate for fish farming, with the goal of reintroducing fish to areas with a deficiency of fish populations.
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Punyashree, H. N., M. K. Mahesh Kumar i Dr M. K. Mahesh. "Study of Water Quality and Distribution of Phytoplankton in Hebbal Lake, Krishnarajanagara". International Journal for Research in Applied Science and Engineering Technology 11, nr 12 (31.12.2023): 1793–808. http://dx.doi.org/10.22214/ijraset.2023.57642.
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Abstract: Life on earth depends on fresh water. Phytoplanktons are free floating, photosynthetic, aquatic microorganisms, which moves from one place to another. Phytoplanktons which are present in Hebbal Lake, Krishnarajanagara, and Mysore were studied with respect to their species diversity and distribution. The phytoplankton community is mainly represented by algal representatives including both prokaryotes and eukaryotic genera. Studies on phytoplankton and water quality of Hebbal Lake, Krishnarajanagar, Mysore Karnataka were undertaken for 5months from May 2023 to September 2023. The quantitative analysis of phytoplankton was done by Lackey’s drop method modified by saxena (1987).Diversity indices have been discussed by using PASTA Software Program. Physical and Chemical parameters were analysed using the standard methods of APHA (2025) and Trivedi and Gael (1984). Among the total 60 species recorded, 33species of Bacillariophyceae, 7species of Chlorophyceae, 8species of Cyanophyceae, 8 species of Desmidiaceae, 3species of Euglenophyceae are reported. Bacillariophyceae was the most dominant group followed by Chlorophyceae, Cyanophyceae, Desmidiaceae and Euglenophyceae. The result of physicochemical and biological parameters along with statistical method and biodiversity indices indicated that the Hebbal Lake is threatened ecologically due to various anthropogenic activities which lead organic pollution and eutrophication status of the lake. Statistical program Bray – Curtis similarity index explained, the cluster of EC, Total hardness and Total alkalinity is highly correlated with the clusters of phytoplanktons. Shannon and Weiner index showed that the lake was heavily polluted in the month of May due to increased temperature.
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Юсупова, K. Yusupova, Корсак, M. Korsak, Мошаров, Sergey Mosharov, Кроленко i M. Krolenko. "The Forecast of Phytoplankton Spring Blossoming in the Uchinsky Reservoir". Safety in Technosphere 4, nr 1 (25.02.2015): 12–17. http://dx.doi.org/10.12737/8226.
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Increase of water treatment efficiency in water supply systems during the spring period directly depends on the forecast
accuracy related to mass blossoming of phytoplankton in drinking reservoirs. Object of research is the Uchinsky reservoir – the
drinking reservoir having insignificant its own water collection area, and fed by water of Moscow Canal. The data on seasonal
phytoplankton dynamics received in Akulovsky Hydrosite Laboratory of the MCUE "Mosvodokanal" for two stations: Pestovo
(reservoir’s headwater) and Listvyanka (reservoir’s lower part), and also actinometric data of continuous supervision from 1998
to 2003 performed by Lomonosov Moscow State University’s Geographical faculty Meteorological Observatory (MOMGU) have
been used in this work. Results of mathematical modeling for dependence of start date and peak values of phytoplankton’s
spring blossoming in the Uchinsky reservoir depending on intensity of total solar radiation during the period preceding the
phytoplankton blossoming have been presented. It has been established that the more solar energy streams’ values in the
range of photosynthetic active radiation (PhAR) will be received by the reservoir surface in the middle of February, the later
peaks of phytoplankton’s spring blossoming will be observed. Research results represent undoubted interest for the analysis of
reservoir’s light factor influence on phytoplankton’s seasonal dynamics, and also for the exact forecast related to beginning of
phytoplankton’s spring blossoming in drinking reservoirs when planning water treatment actions.
21
Kalinkina, Nataliia, i Julia Slastina. "Spring phytoplankton of Lake Onego as a trophic resource for deep-water benthos". BIO Web of Conferences 113 (2024): 04005. http://dx.doi.org/10.1051/bioconf/202411304005.
Pełny tekst źródłaStreszczenie:
In the past few years the relict deep-water crustacean Monoporeia affinis (Lindström, 1855) has become less abundant in Lake Onego, Europe’s second largest lake. Further studies are needed, therefore, to better understand the formation of spring phytoplankton as food for deep-water benthos. The aim of the present project was to study the temperature-dependent vertical distribution of phytoplankton in Petrozavodsk Bay of Lake Onego in the spring season. In May 2019, the total abundance, biomass and species composition of phytoplankton were assessed. The transparency and temperature of Onego water were also measured. The median values of phytoplankton’s total abundance and biomass at various growth stages were 1.15–1.67 M cells/l and 1.96–3.12 mg/l, respectively. The above indices were consistent with the long-term maximum growth of phytoplankton in Petrozavodsk Bay in spring and were not markedly different (p<0.05) from those for spring phytoplankton in 1989-2015, indicating the permanent trophic status of Petrozavodsk Bay in the spring season over the past 30 years. A significant difference (p>0.05) in the vertical distribution of phytoplankton, dominated by Aulacoseira islandica (O. Müll.) Sim diatoms, was found between the stations in May 2019. The reproduction of the relict deep-water crustacean M. affinis, taking place simultaneously with the intensive vegetation and the settling of its major food resource, A. islandica, on the bottom, suggests the formation of favourable feeding conditions for deep-water benthos in Petrozavodsk Bay of Lake Onego.
22
Sukatar, Atakan, Alperen Ertaş, Rıza Akgül i İnci Tüney Kızılkaya. "Assessment of the ecological and trophic status of Lake Bafa (Turkey) based on phytoplankton". Ege Journal of Fisheries and Aquatic Sciences 38, nr 2 (15.06.2021): 135–46. http://dx.doi.org/10.12714/egejfas.38.2.01.
Pełny tekst źródłaStreszczenie:
Phytoplankton groups are one of the major quality element to be used in the evaluation of the trophic and ecological state of freshwater ecosystems according to the EU Water Framework Directive. This research was made to assess the trophic and ecological status of Lake Bafa in Turkey, on the basis of phytoplankton communities. Büyük Menderes River is one of the most important factor that carries pollutants to Lake Bafa. The eight sampling station were assigned to evaluate the ecological and trophic state of the lake. Phytoplankton species were collected monthly for 2 years study period. Most commonly used phtoplankton indices Q index and Carlson’s Trophic State Index (TSI), and different versions of diversity indices were used to estimate trophic and ecological state of the lake. Similarities between the sampling stations were clustured by using the unweighted pair group method using arithmetic average (UPGMA), based on phytoplankton communities. Correlations between the applied indices were determined by using Pearson Correlation. After the identification of collected phytoplanktons, total of 63 taxa which belong to classis of Cyanophyceae (11.2%), Bacillariophyceae (49.2%), Chlorophyceae (23.8%), Xanthophyceae (1.5%), Euglenophyceae (11.2%) and Dinophyceae (3.1%) were detected. The 1st and 2nd stations were the most similar stations to each other (88%) according to phytoplankton communities. Secchi disc depth (SD) and TP played an important role in the distribution of phytoplankton species in Lake Bafa. The highest significant positive correlation was determined between Q and TSI (r = 0.987, p˂0.01). Considering the TDI values in the phytoplankton composition of the lake, it can be said that although the productivity status of the studied lake is still “mesotrophic”, it has a tendency towards “eutrophic” state. According to the Q values, the first five stations reflect the moderate ecological state, while the 6th, 7th and 8th stations represent the poor ecological state.
23
Sakhare, Vishwas Balasaheb, i Ashvini Dnyandeo Chalak. "Phytoplankton diversity of the Gharni Reservoir in Latur district, Maharashtra, India". Journal of Fisheries 3, nr 2 (31.08.2015): 272. http://dx.doi.org/10.17017/jfish.v3i2.2015.94.
Pełny tekst źródłaStreszczenie:
The phytoplanktonic samples were collected from the Gharni Reservoir of Latur district of Maharashtra for a period of one year, from June 2013 to May 2014. Totally 18 species of phytoplankton belonging to different taxonomic groups were identified. Among these 7 species belong to Chlorophyceae, 5 species to Cyanophyceae, 3 species to Bacillariophyceae and 3 species to Euglenophyceae. The phytoplankton productivity fluctuated seasonally and the maximum number of 560 units/liter was recorded during month of February and March and minimum number of 95 units/liter during the month of September.
24
Sakhare, Vishwas Balasaheb, i Ashvini Dnyandeo Chalak. "Phytoplankton diversity of the Gharni Reservoir in Latur district, Maharashtra, India". Journal of Fisheries 3, nr 2 (30.08.2015): 272–74. http://dx.doi.org/10.17017/j.fish.103.
Pełny tekst źródłaStreszczenie:
The phytoplanktonic samples were collected from the Gharni Reservoir of Latur district of Maharashtra for a period of one year, from June 2013 to May 2014. Totally 18 species of phytoplankton belonging to different taxonomic groups were identified. Among these 7 species belong to Chlorophyceae, 5 species to Cyanophyceae, 3 species to Bacillariophyceae and 3 species to Euglenophyceae. The phytoplankton productivity fluctuated seasonally and the maximum number of 560 units/liter was recorded during month of February and March and minimum number of 95 units/liter during the month of September.
25
Tell, Guillermo. "Phytoplankton diversity". Advances in Limnology 65 (7.07.2014): 5–20. http://dx.doi.org/10.1127/1612-166x/2014/0065-0031.
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Desmit, X., J. P. Vanderborght, P. Regnier i R. Wollast. "Control of phytoplankton production by physical forcing in a strongly tidal, well-mixed estuary". Biogeosciences 2, nr 2 (4.08.2005): 205–18. http://dx.doi.org/10.5194/bg-2-205-2005.
Pełny tekst źródłaStreszczenie:
Abstract. A zero-dimensional model for phytoplanktonic production in turbid, macro-tidal, well-mixed estuaries is proposed. It is based on the description of light-dependent algal growth, phytoplankton respiration and mortality. The model is forced by simple time-functions for solar irradiance, water depth and light penetration. The extinction coefficient is directly related to the dynamics of suspended particulate matter. Model results show that the description of phytoplankton growth must operate at a time resolution sufficiently high to describe the interference between solarly and tidally driven physical forcing functions. They also demonstrate that in shallow to moderately deep systems, simulations using averaged, instead of time-varying, forcing functions lead to significant errors in the estimation of phytoplankton productivity. The highest errors are observed when the temporal pattern of light penetration, linked to the tidal cycle of solids settling and resuspension, is neglected. The model has also been applied using realistic forcing functions typical of two locations in the Scheldt estuary. Model results are consistent with the typical phytoplankton decay observed along the longitudinal, seaward axis in the tidal river and oligohaline part of this estuary.
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Ishaq, Fouzia, D. R. Khanna i Amir Khan. "Physico-chemical and phytoplanktonic characteristics of river Tons at Dehradun (Uttarakhand), India". Journal of Applied and Natural Science 5, nr 2 (1.12.2013): 465–74. http://dx.doi.org/10.31018/jans.v5i2.355.
Pełny tekst źródłaStreszczenie:
The physico-chemical and phytoplankton characteristics of the Tons River were analyzed during August 2011-July 2012. The samples were collected from Garhi Cant (Site 1) and Tapkeshwar temple (Site 2) at Dehradun. The results showed that temperature, velocity, DO, nitrate and phosphate affected the phytoplanktonic diversity of river Tons. Thirty five genera of phytoplankton belonging to three families of Chlorophyceae, Bacillariophyceae and Myxophyceae were also identified in the river water. The family Bacillariophyceae was dominating the river with much abundance throughout the study period. Bacillariophyceae was recorded with the maximum of 222.25±90.84 Unit/L at sampling site 1 and 239.08±125.41 Unit/L at sampling site 2. The greater number of individuals was in family Bacillariophyceae (239.08±125.41 Unit/L) followed by Chlorophyceae (183.75±112.50 Unit/L) and Myxophyceae(40.91±36.16 Unit/L) during the study period. Both the number of genera and number of individuals belonging to each genera was maximum in case of family Bacillariophyceae followed by Chlorophyceae and Myxophyceae. The present study revealed that the water quality of river Tons was fairly good for the growth and survival of phytoplankton, and as a result it sustains the higher phytoplankton diversity of Tons river.
28
Zhuang, Kejun, Gao Jia i Dezhi Liu. "Stability and Hopf Bifurcation in a Three-Component Planktonic Model with Spatial Diffusion and Time Delay". Complexity 2019 (11.07.2019): 1–17. http://dx.doi.org/10.1155/2019/4590915.
Pełny tekst źródłaStreszczenie:
Due to the different roles that nontoxic phytoplankton and toxin-producing phytoplankton play in the whole aquatic system, a delayed reaction-diffusion planktonic model under homogeneous Neumann boundary condition is investigated theoretically and numerically. This model describes the interactions between the zooplankton and two kinds of phytoplanktons. The long-time behavior of the model and existence of positive constant equilibrium solution are first discussed. Then, the stability of constant equilibrium solution and occurrence of Hopf bifurcation are detailed and analyzed by using the bifurcation theory. Moreover, the formulas for determining the bifurcation direction and stability of spatially bifurcating solutions are derived. Finally, some numerical simulations are performed to verify the appearance of the spatially homogeneous and nonhomogeneous periodic solutions.
29
Shcherbak, V. I., i N. Ye Semeniuk. "Structural and functional characteristics of phytoplankton, algal mats, detritus and water quality under main abiotic factors in urban ponds (case study of urban settlement Hostomel, Bucha District, Kyiv Region, Ukraine). Report ІI. Quantitative indicators, dominant complexes of phytoplankton, detritus and water quality of urban ponds". Algologia 33, nr 2 (czerwiec 2023): 65–82. http://dx.doi.org/10.15407/alg33.02.065.
Pełny tekst źródłaStreszczenie:
The paper deals with phytoplankton quantitative indicators and dominant complex structure, and dimensional and morphological characteristics of detritus particles in the ponds of Hostomel urban settlement. Water quality has been assessed according to phytoplankton characteristics. The phytoplankton abundance made up 2648.0–113675.0 thousand cells dm–3, and it was mainly formed by Cyanobacteria. The biomass varied within 3.72–16.53 g m–3, which is indicative of eutrophic waters. The biomass was dominated by Euglenozoa, Miozoa and Bacillariophyta. The dominant complex according to phytoplankton abundance included small-celled Cyanobacteria, according to biomass – large-celled Euglenozoa, Miozoa and Bacillariophyta with a certain share of Cyanobacteria. Different structures of dominant complexes according to abundance and biomass is an important adaptation mechanism of urban ponds phytoplankton. Phytoplankton’s high primary productivity completely fulfils energetic and trophic demands of aquatic organisms at higher trophic levels, and the unconsumed algal biomass is decomposed and transferred to the water column in the form of organic detritus. The organic detritus particles can be ranged into four classes – from minimal < 30 mcm to maximal > 101 mcm, whose biomass can reach 57.60–62.80 mg dm–3. It indicates that this biological component is very important in forming energy flow, matter circulation and trophic relations. Water quality assessment according to phytoplankton saprobiological characteristics has shown that χ–ο-saprobic and β-mesosaprobic organisms prevailed in the ponds under study. So, the water bodies can be classified within the range “very clean”–“clean” and “moderately polluted” waters. Unlike most urban ponds, the pond network of Hostomel can be considered a quite safe recreation zone from the ecological point of view and is an attractive green space within the urban landscape.
30
Leftley, John. "Phytoplankton". Journal of Experimental Marine Biology and Ecology 159, nr 1 (lipiec 1992): 131–32. http://dx.doi.org/10.1016/0022-0981(92)90263-a.
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Banerjee, Malay, i Ezio Venturino. "A phytoplankton–toxic phytoplankton–zooplankton model". Ecological Complexity 8, nr 3 (wrzesień 2011): 239–48. http://dx.doi.org/10.1016/j.ecocom.2011.04.001.
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Lovecchio, Salvatore, Eric Climent, Roman Stocker i William M. Durham. "Chain formation can enhance the vertical migration of phytoplankton through turbulence". Science Advances 5, nr 10 (październik 2019): eaaw7879. http://dx.doi.org/10.1126/sciadv.aaw7879.
Pełny tekst źródłaStreszczenie:
Many species of motile phytoplankton can actively form long multicellular chains by remaining attached to one another after cell division. While chains swim more rapidly than single cells of the same species, chain formation also markedly reduces phytoplankton’s ability to maintain their bearing. This suggests that turbulence, which acts to randomize swimming direction, could sharply attenuate a chain’s ability to migrate between well-lit surface waters during the day and deeper nutrient-rich waters at night. Here, we use numerical models to investigate how chain formation affects the migration of phytoplankton through a turbulent water column. Unexpectedly, we find that the elongated shape of chains helps them travel through weak to moderate turbulence much more effectively than single cells, and isolate the physical processes that confer chains this ability. Our findings provide a new mechanistic understanding of how turbulence can select for phytoplankton with elongated morphologies and may help explain why turbulence triggers chain formation.
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Wang, Hong Wei, Wei Zhang, Kai Ming Li, Yong Gang Zhou, Hai Ming Xu, Shan An i Liang Ma. "A Phytoplanktonic Investigation and Water Quality Assessment about Tanjiang River". Applied Mechanics and Materials 130-134 (październik 2011): 3795–98. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3795.
Pełny tekst źródłaStreszczenie:
A phytoplanktonic investigation of Tanjiang River was conducted in March 2011. 202 species of phytoplankton belonging to 86 genera and 7 phyla were identified altogether. Chlorphyta and Bacillariophyta which occupied 36.14% and 43.56% of the total number were the most, indicating that the green algae and diatom were the dominant group. Tanjiang River was β-meso-polluted to oligo-polluted judging from phytoplankton community while it was clean or light-polluted judging from Shannon-Weaver diversity index, Margalef diversity index and Pielou evenness index. Tanjiang River was light-polluted or oligo-polluted judging from the above indicators in normal water season, but there has been a trend to β-meso-polluted.
34
Kurnosova, Anna S., i M. A. Shulgina. "Hydrochemical conditions and phytoplankton in the Kievka estuary (Japan Sea) with calculation of primary production by phosphorus utilization". Izvestiya TINRO 203, nr 4 (26.12.2023): 961–75. http://dx.doi.org/10.26428/1606-9919-2023-203-961-975.
Pełny tekst źródłaStreszczenie:
Spatial distribution of chemical parameters, as concentration of dissolved inorganic phosphorus (DIP), inorganic silica, nitrite nitrogen, nitrate nitrogen, ammonium nitrogen, total iron, dissolved oxygen, and biochemical oxygen demand (BOD5) is considered together with species composition, abundance and biomass of phytoplankton on the data of complex survey conducted in the estuary of the Kievka River in May 2020, with special attention to DIP and phytoplankton variations along the salinity gradient in the zone of mixing fresh and saline waters. In the lower Kievka, phytoplankton was studied for the first time. The phytoplankon biomass varied from 0.05 to 0.21 g/m3, proportional to changes in primary production calculated from the DIP balance in the river water moving downstream through the estuary (from 0.02 to 0.23 g/m3km). The highest production and the highest biomass were found in the upper part of the external estuary. The water of Kievka River was initially poor in nutrients, so primary production in its estuary was supported by DIP regenerated in the process of organic matter mineralization in the internal estuary.
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Huot, Y., M. Babin, F. Bruyant, C. Grob, M. S. Twardowski i H. Claustre. "Relationship between photosynthetic parameters and different proxies of phytoplankton biomass in the subtropical ocean". Biogeosciences 4, nr 5 (16.10.2007): 853–68. http://dx.doi.org/10.5194/bg-4-853-2007.
Pełny tekst źródłaStreszczenie:
Abstract. Probably because it is a readily available ocean color product, almost all models of primary productivity use chlorophyll as their index of phytoplankton biomass. As other variables become more readily available, both from remote sensing and in situ autonomous platforms, we should ask if other indices of biomass might be preferable. Herein, we compare the accuracy of different proxies of phytoplankton biomass for estimating the maximum photosynthetic rate (Pmax) and the initial slope of the production versus irradiance (P vs. E) curve (α). The proxies compared are: the total chlorophyll a concentration (Tchla, the sum of chlorophyll a and divinyl chlorophyll), the phytoplankton absorption coefficient, the phytoplankton photosynthetic absorption coefficient, the active fluorescence in situ, the particulate scattering coefficient at 650 nm (bp(650)), and the particulate backscattering coefficient at 650 nm (bbp(650)). All of the data (about 170 P vs. E curves) were collected in the South Pacific Ocean. We find that when only the phytoplanktonic biomass proxies are available, bp(650) and Tchla are respectively the best estimators of Pmax and α. When additional variables are available, such as the depth of sampling, the irradiance at depth, or the temperature, Tchla is the best estimator of both Pmax and α.
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D'Elia, Christopher F., James G. Sanders i Walter R. Boynton. "Nutrient Enrichment Studies in a Coastal Plain Estuary: Phytoplankton Growth in Large-Scale, Continuous Cultures". Canadian Journal of Fisheries and Aquatic Sciences 43, nr 2 (1.02.1986): 397–406. http://dx.doi.org/10.1139/f86-050.
Pełny tekst źródłaStreszczenie:
The response of phytoplanktonic growth to experimental nutrient addition in a tributary of the Chesapeake Bay estuary varied with season and nutrient availability. In bioassay experiments employing outdoor 0.5-m3 continuous cultures freshly inoculated with natural phytoplankton from the Patuxent River estuary, supplements of N, either as ammonium or nitrate, enhanced growth greatly during the low-flow, late-summer season — a period when N:P ratios of dissolved inorganic nutrient standing stocks are characteristically below 5:1 (by atoms). Growth response to N addition was very rapid (1 d after the start of an experiment), implying that phytoplankton in the bioassay were N limited when removed from the estuary. PO43− addition enhanced phytoplankton growth during the late-winter, high-flow season, when N: P ratios (as previous) typically exceed 90:1 (by atoms), but the response lagged enrichment by at least 4 d and biomass levels achieved in these cultures were less than one third of those achieved in the N-enriched cultures during the late summer. The great seasonal variability in river flow, nutrient regimes, and the response of natural phytoplankton assemblages to nutrient enrichment in the Patuxent, and similar estuaries, suggest that management strategies to improve "water quality" will need to consider N as well as P additions.
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Nakashima, M., I. C. Lee i T. Kusuda. "Seasonal variations in growth rate of phytoplankton in Hakata Bay, Japan". Water Science and Technology 46, nr 11-12 (1.12.2002): 443–49. http://dx.doi.org/10.2166/wst.2002.0776.
Pełny tekst źródłaStreszczenie:
Recently, water pollution with high concentrations of organic matter has occurred frequently in Hakata Bay. It is said that a high level of primary production provides much organic matter and affects water quality of the bay, and it is proved by the appearance of phytoplankton throughout the year. In this study, we simulated variations of phytoplankton population with a box-type model using monthly data in a long-term measurement and we analyzed the final growth rate changes of phytoplanktons that explain the conditions for its appearance. Consequently, we found that the final growth rate varies with pattern of half-year periodicity and water temperature and/or ambient nutrient controls the final growth rate to be low every January and July.
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Bhavya, Panthalil S., Jae Joong Kang, Hyo Keun Jang, HuiTae Joo, Jae Hyung Lee, Jang Han Lee, Jung Woo Park, Kwanwoo Kim, Hyung Chul Kim i Sang Heon Lee. "The Contribution of Small Phytoplankton Communities to the Total Dissolved Inorganic Nitrogen Assimilation Rates in the East/Japan Sea: An Experimental Evaluation". Journal of Marine Science and Engineering 8, nr 11 (29.10.2020): 854. http://dx.doi.org/10.3390/jmse8110854.
Pełny tekst źródłaStreszczenie:
As a part of Korean-Russian joint expeditions in the East/Japan Sea during 2012 and 2015, a set of total and small (<2 μm) phytoplankton NO3− and NH4+ uptake rate estimations were carried out. The study aimed to assess the spatio-temporal variations in dissolved inorganic nitrogen (DIN) assimilation by the total and small phytoplankton. The results show that the total NO3− uptake rates during 2012 varied between 0.001 and 0.150 μmol NL−1h−1 (mean ± SD = 0.034 ± 0.033) and that the total NH4+ uptake rates ranged between 0.002 and 0.707 μmol NL−1h−1 (mean ± SD = 0.200 ± 0.158). The total uptake rates during 2015 were ranged from 0.003 to 0.530 (mean ± S.D. = 0.117 ± 0.120 μmol NL−1h−1) for NO3− and from 0.008 to 1.17 (mean ± S.D. = 0.199 ± 0.266 NL−1h−1) for NH4+. The small phytoplankton NO3− and NH4+ uptake rates during 2015 ranged between 0.001 and 0.164 (mean ± S.D. = 0.033 ± 0.036) μmol NL−1h−1 and 0.010–0.304 (mean ± S.D. = 0.101 ± 0.073) μmol NL−1h−1, respectively. Small phytoplankton’s contribution to the total depth-integrated NO3− and NH4+ uptake rates ranged from 10.24 to 59.36% and from 30.21 to 68.55%, respectively. The significant negative relationship observed between the depth-integrated total NO3− and NH4+ uptake rates and small phytoplankton contributions indicates a possible decline in the DIN assimilation rates under small phytoplankton dominance. The results from the present study highlight the possibility of a reduction in the total DIN assimilation process in the East/Japan Sea when small phytoplankton dominate under strong thermal stratification due to sea surface warming. The present study’s findings agree with the model projections, which suggested a decline in primary production in the global warming scenario.
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Huot, Y., M. Babin, F. Bruyant, C. Grob, M. S. Twardowski i H. Claustre. "Does chlorophyll <i>a</i> provide the best index of phytoplankton biomass for primary productivity studies?" Biogeosciences Discussions 4, nr 2 (1.03.2007): 707–45. http://dx.doi.org/10.5194/bgd-4-707-2007.
Pełny tekst źródłaStreszczenie:
Abstract. Probably because it is a readily available ocean color product, almost all models of primary productivity use chlorophyll as their index of phytoplankton biomass. As other variables become more readily available, both from remote sensing and in situ autonomous platforms, we should ask if other indices of biomass might be preferable. Herein, we compare the accuracy of different proxies of phytoplankton biomass for estimating the maximum photosynthetic rate (Pmax) and the initial slope of the production versus irradiance (P vs. E) curve (α). The proxies compared are: the total chlorophyll a concentration (Tchla, the sum of chlorophyll a and divinyl chlorophyll), the phytoplankton absorption coefficient, the phytoplankton photosynthetic absorption coefficient, the active fluorescence in situ, the particulate scattering coefficient at 650 nm (bp (650)), and the particulate backscattering coefficient at 650 nm (bbp (650)). All of the data (about 170 P vs. E curves) were collected in the South Pacific Ocean. We find that when only the phytoplanktonic biomass proxies are available, bp (650) and Tchla are respectively the best estimators of Pmax and alpha. When additional variables are available, such as the depth of sampling, the irradiance at depth, or the temperature, Tchla becomes the best estimator of both Pmax and α. From a remote sensing perspective, error propagation analysis shows that, given the current algorithms errors for estimating bbp(650), Tchla remains the best estimator of Pmax.
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Kumar, Dashendra, Arun Kumar i Avinash Kumar. "Diversity and distribution of phytoplanktons in two chours of Madhepura District". PROCEEDINGS OF THE ZOOLOGICAL SOCIETY OF INDIA 22, nr 02 (grudzień 2023): 213. http://dx.doi.org/10.59467/pzsi.2023.22.213.
Pełny tekst źródłaStreszczenie:
Diversity and distribution of Phytoplanktons was studied in Dourachour of Madhepura district. Collected Phytoplanktons belonged to class Chlorophyceae, Cyanophyceae, Bacillariophyceae and Euglinophyceae. Altogether 50 species of Phytoplanktons were identified, 20 from Chlorophyceae, 16 from Cyanophyceae, 9 from Bacillariophyceae and 5 from Euglinophyceae. Chlorophyceae contributed 40% of the total phytoplanktons, Cyanophyceae 32%, Bacillariophyceae 18% and Euglinophyceae 10%. Maximum number of Phytoplanktons was recorded in the month of August and minimum in the month of June, Chlorophyceae showed maximum number in the month of August, Cyanophyceae in the month of May, Bacillariophyceae in the month of January and Euglinophyceae in the month of October. Boyd's diversity index was greater than 4 in every month which show that water of chour is clean. . KEYWORDS :Dourachour, Phytoplankton, Diversity and distribution, Chlorophyceae, Cyanophyceae, Bacillariophyceae and Euglinophyceae.
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Cassianides, Angelina, Elodie Martinez, Christophe Maes, Xavier Carton i Thomas Gorgues. "Monitoring the Influence of the Mesoscale Ocean Dynamics on Phytoplanktonic Plumes around the Marquesas Islands Using Multi-Satellite Missions". Remote Sensing 12, nr 16 (5.08.2020): 2520. http://dx.doi.org/10.3390/rs12162520.
Pełny tekst źródłaStreszczenie:
The Marquesas islands are a place of strong phytoplanktonic enhancement, whose original mechanisms have not been explained yet. Several mechanisms such as current−bathymetry interactions or island run-off can fertilize waters in the immediate vicinity or downstream of the islands, allowing phytoplankton enhancement. Here, we took the opportunity of an oceanographic cruise carried out at the end of 2018, to combine in situ and satellite observations to investigate two phytoplanktonic blooms occurring north and south of the archipelago. First, Lagrangian diagnostics show that both chlorophyll-a concentrations (Chl) plumes are advected from the islands. Second, the use of Finite-size Lyaponov Exponent and frontogenesis diagnostics reveal how the Chl plumes are shaped by the passage of a mesoscale cyclonic eddy in the south and by a converging front and finer-scale dynamic activity in the north. Our results based on these observations provide clues to the hypothesis of a fertilization from the islands themselves allowing phytoplankton to thrive. They also highlight the role of advection to disperse and shape the Chl plumes in two regions with contrasting dynamical regimes.
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Andreeva, N. A., i E. A. Grebneva. "Algoflora of Donuzlav gulf (expedition materials of HS “Donuzlav” in june 7-10, 2016)". Monitoring systems of environment, nr 1 (22.03.2017): 121–26. http://dx.doi.org/10.33075/2220-5861-2017-1-121-126.
Pełny tekst źródłaStreszczenie:
The preliminary investigation of cultivated cyanobacteria and microalgae in aqueous phytoplankton samples took place at seven complex oceanographic stations along the coast of western Crimea during the expedition of HS “Donuzlav”. The main phytoplanktonic representatives at the most of stations were cyanobacteria and diatoms. We isolated cyanobacteria (3) and diatom (2) strains from two samples.
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Lefebvre, Alain, Natacha Guiselin, Frederique Barbet i Felipe L. Artigas. "Long-term hydrological and phytoplankton monitoring (1992–2007) of three potentially eutrophic systems in the eastern English Channel and the Southern Bight of the North Sea". ICES Journal of Marine Science 68, nr 10 (15.09.2011): 2029–43. http://dx.doi.org/10.1093/icesjms/fsr149.
Pełny tekst źródłaStreszczenie:
Abstract Lefebvre, A., Guiselin, N., Barbet, F., and Artigas, F. L. 2011. Long-term hydrological and phytoplankton monitoring (1992–2007) of three potentially eutrophic systems in the eastern English Channel and the Southern Bight of the North Sea. – ICES Journal of Marine Science, 68: 2029–2043. The spatial and main temporal variations in nutrient concentrations and phytoplankton abundance were investigated between 1992 and 2007 in the eastern English Channel and the Southern Bight of the North Sea, zones of consistent presence of Phaeocystis globosa and diatom blooms. Silicate and phosphate were the main nutrients potentially limiting phytoplankton growth, but the dynamics of the limitation seemingly differ between sites. Phosphate concentration showed a clear monotonic decreasing trend, whereas dissolved inorganic nitrogen and silicate trends were more complex. Nitrate was rarely or never a limiting factor. Results highlight three main periods with a Phaeocystis- or diatom-dominated system in the 1990s, and a more complex pattern in the 2000s. The composition of the phytoplanktonic community is described and an attempt made to establish a link between the community and its environment in terms of variability, shifts, and trends. The effects of larger- vs. regional-scale controlling factors are also discussed.
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Yang, Dong Fang, Feng You Wang, Si Xi Zhu, You Fu Wu i Hua Zhong He. "The Changing of Atmospheric Carbon Determined by Silicon". Applied Mechanics and Materials 687-691 (listopad 2014): 4355–57. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.4355.
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Silicon is the essential element to phytoplankton, determining the growth of phytoplankton. Phytoplankton is the basis of the marine food chain, as well as phytoplankton has tremendous capacity to absorb carbon. Phytoplankton and human determine the change of atmospheric carbon collectively, so the earth system is able to maintain the dynamic balance of the emission of anthropic carbon and the absorption of carbon by phytoplankton. This paper analyzed the effects of Silicon to the growth of phytoplankton, the absorption of CO2 by phytoplankton, the biogeochemical process of silicon, and revealed the effects of silicon to the change of phytoplankton growth and atmospheric carbon.
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Manisha, Manisha, i Arun Kumar. "Biodiversity of phytoplankton in two chours of Madhepura district and application of Boyd's index". PROCEEDINGS OF THE ZOOLOGICAL SOCIETY OF INDIA 22, nr 02 (grudzień 2023): 145. http://dx.doi.org/10.59467/pzsi.2023.22.145.
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During the Kosi flood of 2008 in Madhepura district flood water deposited in several low lands were converted into water reservoirs. Such water reservoirs are locally known as Chours. In some such Chours water remain logged around the year. Due to anthropogenic activity water of Chours became polluted. Two Chours, one from Sahugarh and other from Tuniyahi-Sukhasan of Madhepura were selected for the study of pollution. Phytoplanktons were collected from Jan-2023 to June-2023 at regular intervals. Samples were identified and total number of Phytoplanktons counted using Lackey's drop method. The no. of Phytoplankton genera were maximum in the month of April (16) and minimum in the month of May (11) in Chour of Sahugarh while the no. of Phytoplankton genera were maximum (18) in the month of April and minimum (10) in the month of June in Chour of Tuniyahi-Sukhasan. The value of Boyd's diversity index was maximum in the month of April (1.420) and minimum in the month of May (1.016) in the Chour of Sahugarh while in Chour of Tuniyahi-Sukhsan the value of Boyd's index was maximum in the month of April (1.591) and minimum in the month of June (0.912). The water of Sahugarh Chour was moderately polluted during January to June but the water of Tuniyahi-Sukhasan was heavily polluted in the month of June and moderately polluted in the month of Jan to May. . KEYWORDS :Pollution, Boyd's diversity index, Phytoplanktons, Chours.
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Siegfried, Clifford A. "Phytoplankton Ecology". Ecology 68, nr 2 (kwiecień 1987): 460. http://dx.doi.org/10.2307/1939287.
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Goymer, Patrick. "Phytoplankton resilience". Nature Ecology & Evolution 5, nr 10 (październik 2021): 1330. http://dx.doi.org/10.1038/s41559-021-01558-1.
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Welch, David W. "Phytoplankton productivity?" Nature 362, nr 6423 (kwiecień 1993): 795–96. http://dx.doi.org/10.1038/362795c0.
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Falkowski, Paul G., i Cara Wilson. "Phytoplankton productivity?" Nature 362, nr 6423 (kwiecień 1993): 796. http://dx.doi.org/10.1038/362796a0.
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Minkel, JR. "Anemic Phytoplankton". Scientific American 295, nr 5 (listopad 2006): 37. http://dx.doi.org/10.1038/scientificamerican1106-37b.
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