Bibliografias temáticas / Planktonic ecosystem

Literatura científica selecionada sobre o tema "Planktonic ecosystem"

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Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "Planktonic ecosystem"

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Beaugrand, Grégory. "Monitoring pelagic ecosystems using plankton indicators". ICES Journal of Marine Science 62, n.º 3 (1 de janeiro de 2005): 333–38. http://dx.doi.org/10.1016/j.icesjms.2005.01.002.

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Abstract Planktonic organisms are an important food resource of pelagic ecosystems, but they also serve as an integrator of hydroclimatic forcing. Four types of recently developed plankton indicator, based on the Continuous Plankton Recorder survey, are summarized here: indicators based on individual taxa; indicators based on functional attributes of the ecosystem (diversity); species assemblage indicators; and indicators of larval fish survival. All provide information on the state of a pelagic ecosystem, but have different limitations. Therefore, their combined application provides the most accurate diagnosis of ecosystem state. In most of the examples described, statistical analyses help to identify major spatial and temporal patterns, and may allow future ecosystem changes to be anticipated.
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Zhang, Meijing, Ruitong Jiang, Jianlin Zhang, Kejun Li, Jianheng Zhang, Liu Shao, Wenhui He e Peimin He. "The Impact of IMTA on the Spatial and Temporal Distribution of the Surface Planktonic Bacteria Community in the Surrounding Sea Area of Xiasanhengshan Island of the East China Sea". Journal of Marine Science and Engineering 11, n.º 3 (23 de fevereiro de 2023): 476. http://dx.doi.org/10.3390/jmse11030476.

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The growing world population has produced an increasing demand for seafood, and the aquaculture industry is under corresponding pressure to fill this demand. The offshore ecology and environment are under significant threat with the continuous expansion of the scale and intensity of aquaculture. Integrated multi-tropic aquaculture (IMTA) is a healthy and sustainable mariculture model based on ecosystem-level management, and has become popular in recent years. It is an effective way to cope with the significant changes in offshore ecosystems under multiple stressors. Phytoplankton bacteria are essential to maintaining the marine ecosystem’s balance and stability. Investigating the changes in the community structure of marine planktonic bacteria can elucidate the impact of mariculture on the marine ecological environment. This study took the fish-shell IMTA system with natural macroalgae nearby as the object, and monitored the plankton community’s structure in the system’s surface seawater for four quarters from July 2020 to April 2021. The space–time distribution characteristics and influencing factors of the plankton community in the surface water were examined. The results showed no significant difference between the planktonic bacterial communities at different sampling sites. There was also no significant difference in the α-diversity index. However, the dominant species and abundance of planktonic bacteria at the sampling sites differed significantly. Proteobacteria and Bacteroides were the dominant groups of planktonic bacteria. The results of the distance-based redundancy analysis demonstrated that chemical oxygen demand, chlorophyll a, and dissolved oxygen constituted the primary environmental factors affecting the planktonic bacterial community structures. The heatmap also showed that NH4+- N, temperature, and salinity levels were also related to certain planktonic bacteria. This study preliminarily identified the distribution of the surface bacterial plankton community and its response to changes in environmental factors in the sea area near Xiasanhengshan Island. The results provide a preliminary basis for assessing the health and stability of the IMTA system in open sea areas.
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D’Alelio, Domenico, Luca Russo, Gabriele Del Gaizo e Luigi Caputi. "Plankton under Pressure: How Water Conditions Alter the Phytoplankton–Zooplankton Link in Coastal Lagoons". Water 14, n.º 6 (19 de março de 2022): 974. http://dx.doi.org/10.3390/w14060974.

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Transitional waters (TWs), such as coastal lagoons, are bodies of surface water at the transition between saline and freshwater domains. These environments play a vital role in guaranteeing ecosystem services, including provision of food, protection against meteorological events, as anthropogenic carbon sinks, and in filtering of pollutants. Due to the escalating overpopulation characterising coastlines worldwide, transitional systems are over-exploited, degraded, and reduced in their macroscopic features. However, information on the impact of anthropogenic pressures on planktonic organisms in these systems is still scanty and fragmented. Herein, we summarise the literature, with a special focus on coastal lagoons undergoing anthropogenic pressure. Specifically, we report on the implications of human impacts on the ecological state of plankton, i.e., a fundamental ecological component of aquatic ecosystems. Literature information indicates that human forces may alter ecosystem structures and functions in coastal lagoons, as in other TWs such as estuaries, hampering the phytoplankton–zooplankton link, i.e., the main trophic process occurring in those communities, and which sustains aquatic productivity. Changes in the dominance and lifestyle of key planktonic players, plus the invasion of ‘alien’ species, and consequent regime shifts, are among the most common outcomes of human disturbance.
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Schartau, Markus, Philip Wallhead, John Hemmings, Ulrike Löptien, Iris Kriest, Shubham Krishna, Ben A. Ward, Thomas Slawig e Andreas Oschlies. "Reviews and syntheses: parameter identification in marine planktonic ecosystem modelling". Biogeosciences 14, n.º 6 (29 de março de 2017): 1647–701. http://dx.doi.org/10.5194/bg-14-1647-2017.

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Abstract. To describe the underlying processes involved in oceanic plankton dynamics is crucial for the determination of energy and mass flux through an ecosystem and for the estimation of biogeochemical element cycling. Many planktonic ecosystem models were developed to resolve major processes so that flux estimates can be derived from numerical simulations. These results depend on the type and number of parameterizations incorporated as model equations. Furthermore, the values assigned to respective parameters specify a model's solution. Representative model results are those that can explain data; therefore, data assimilation methods are utilized to yield optimal estimates of parameter values while fitting model results to match data. Central difficulties are (1) planktonic ecosystem models are imperfect and (2) data are often too sparse to constrain all model parameters. In this review we explore how problems in parameter identification are approached in marine planktonic ecosystem modelling. We provide background information about model uncertainties and estimation methods, and how these are considered for assessing misfits between observations and model results. We explain differences in evaluating uncertainties in parameter estimation, thereby also discussing issues of parameter identifiability. Aspects of model complexity are addressed and we describe how results from cross-validation studies provide much insight in this respect. Moreover, approaches are discussed that consider time- and space-dependent parameter values. We further discuss the use of dynamical/statistical emulator approaches, and we elucidate issues of parameter identification in global biogeochemical models. Our review discloses many facets of parameter identification, as we found many commonalities between the objectives of different approaches, but scientific insight differed between studies. To learn more from results of planktonic ecosystem models we recommend finding a good balance in the level of sophistication between mechanistic modelling and statistical data assimilation treatment for parameter estimation.
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Healey, Katherine, Adam H. Monahan e Debby Ianson. "Perturbation dynamics of a planktonic ecosystem". Journal of Marine Research 67, n.º 5 (1 de setembro de 2009): 637–66. http://dx.doi.org/10.1357/002224009791218841.

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Anufriieva, Elena, Elena Kolesnikova, Tatiana Revkova, Alexander Latushkin e Nickolai Shadrin. "Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem". Water 14, n.º 3 (28 de janeiro de 2022): 403. http://dx.doi.org/10.3390/w14030403.

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Lakes and lagoons play an important role worldwide, and salinity fluctuations significantly affect their ecosystems. Bay Sivash, the world’s largest hypersaline water body, underwent a sharp change in salinity, induced by the closing of the North Crimean Canal. To monitor a shift in the ecosystem, a study was carried out from 2014 to 2020 at 15 sites of the lagoon. Since the closure of the canal, the average salinity increased from 22 g L−1 (2013) to 94 g L−1 (2020). Suspended solids and dissolved organic matter also increased. When salinity increased above 50 g L−1, the number of taxa significantly decreased; this was a negative linear relation. The increase in salinity significantly changed the structure of zooplankton and benthos. The most dramatic changes occurred with the salinity increase from 25 to 70 g L−1. Chironomidae larvae numbers began to increase greatly in the ecosystem of the bay, and since 2014, they have rapidly increased their contribution to the abundance of benthos and plankton. The concentration of benthic–planktonic species increased in plankton, in particular, in Harpacticoida and Chironomidae. At salinity above 80–90 g L−1, nauplii and adult brine shrimp appeared to become abundant in plankton and benthos. The transit of the ecosystem to a new alternative state occurred.
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Grigoratou, Maria, Fanny M. Monteiro, Daniela N. Schmidt, Jamie D. Wilson, Ben A. Ward e Andy Ridgwell. "A trait-based modelling approach to planktonic foraminifera ecology". Biogeosciences 16, n.º 7 (10 de abril de 2019): 1469–92. http://dx.doi.org/10.5194/bg-16-1469-2019.

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Abstract. Despite the important role of planktonic foraminifera in regulating the ocean carbonate production and their unrivalled value in reconstructing paleoenvironments, our knowledge on their ecology is limited. A variety of observational techniques such as plankton tows, sediment traps and experiments have contributed to our understanding of foraminifera ecology. But, fundamental questions around costs and benefits of calcification and the effect of nutrients, temperature and ecosystem structure on these organisms remain unanswered. To tackle these questions, we take a novel mechanistic approach to study planktonic foraminifera ecology based on trait theory. We develop a zero-dimensional (0-D) trait-based model to account for the biomass of prolocular (20 µm) and adult (160 µm) stages of non-spinose foraminifera species and investigate their potential interactions with phytoplankton and other zooplankton under different temperature and nutrient regimes. Building on the costs and benefits of calcification, we model two ecosystem structures to explore the effect of resource competition and temperature on planktonic foraminifera biomass. By constraining the model results with ocean biomass estimations of planktonic foraminifera, we estimate that the energetic cost of calcification could be about 10 %–50 % and 10 %–40 % for prolocular and adult stages respectively. Our result suggest that the shell provides protection against processes other than predation (e.g. pathogen invasion). We propose that the low standing biomass of planktonic foraminifera plays a key role in their survival from predation, along with their shell protection. Our model suggests a shift from temperature as a main regulator of foraminifera biomass in the early developmental stage to resource competition for adult biomass.
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Bueno, Marília, Samantha Fernandes Alberto, Renan de Carvalho, Tânia Marcia Costa, Áurea Maria Ciotti e Ronaldo Adriano Christofoletti. "Plankton in waters adjacent to the Laje de Santos state marine conservation park, Brazil: spatio-temporal distribution surveys". Brazilian Journal of Oceanography 65, n.º 4 (dezembro de 2017): 564–75. http://dx.doi.org/10.1590/s1679-87592017129006504.

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Abstract The coastal marine plankton plays a major role in ecosystem functioning by linking pelagic and benthonic environments through energy fluxes. Understanding the dynamic of planktonic organisms is also crucial for conservation and management purposes. Plankton was sampled at ten sites in the waters of the PEMLS and the adjacent area, on four different occasions through 2013 and 2015 in order to identify key planktonic groups and protocols for long-term monitoring. Ninety taxa of zooplanktonic organisms were found with holoplanktonic copepods and cladocerans dominating samples. Zooplankton biomass, mortality and taxonomic composition varied both in space and time. Surface chlorophyll-a concentrations varied spatio-temporally. A protocol for monitoring the plankton of the waters in and adjacent to the PEMLS is suggested based on biomass and mortality of zooplankton and biomass of phytoplankton using periodically in situ calibrated ocean color satellite imagery.
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Anderson, T. R., W. C. Gentleman e A. Yool. "EMPOWER-1.0: an Efficient Model of Planktonic ecOsystems WrittEn in R". Geoscientific Model Development 8, n.º 7 (24 de julho de 2015): 2231–62. http://dx.doi.org/10.5194/gmd-8-2231-2015.

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Abstract. Modelling marine ecosystems requires insight and judgement when it comes to deciding upon appropriate model structure, equations and parameterisation. Many processes are relatively poorly understood and tough decisions must be made as to how to mathematically simplify the real world. Here, we present an efficient plankton modelling testbed, EMPOWER-1.0 (Efficient Model of Planktonic ecOsystems WrittEn in R), coded in the freely available language R. The testbed uses simple two-layer "slab" physics whereby a seasonally varying mixed layer which contains the planktonic marine ecosystem is positioned above a deep layer that contains only nutrient. As such, EMPOWER-1.0 provides a readily available and easy to use tool for evaluating model structure, formulations and parameterisation. The code is transparent and modular such that modifications and changes to model formulation are easily implemented allowing users to investigate and familiarise themselves with the inner workings of their models. It can be used either for preliminary model testing to set the stage for further work, e.g. coupling the ecosystem model to 1-D or 3-D physics, or for undertaking front line research in its own right. EMPOWER-1.0 also serves as an ideal teaching tool. In order to demonstrate the utility of EMPOWER-1.0, we implemented a simple nutrient–phytoplankton–zooplankton–detritus (NPZD) ecosystem model and carried out both a parameter tuning exercise and structural sensitivity analysis. Parameter tuning was demonstrated for four contrasting ocean sites, focusing on station BIOTRANS in the North Atlantic (47° N, 20° W), highlighting both the utility of undertaking a planned sensitivity analysis for this purpose, yet also the subjectivity which nevertheless surrounds the choice of which parameters to tune. Structural sensitivity tests were then performed comparing different equations for calculating daily depth-integrated photosynthesis, as well as mortality terms for both phytoplankton and zooplankton. Regarding the calculation of daily photosynthesis, for example, results indicated that the model was relatively insensitive to the choice of photosynthesis–irradiance curve, but markedly sensitive to the method of calculating light attenuation in the water column. The work highlights the utility of EMPOWER-1.0 as a means of comprehending, diagnosing and formulating equations for the dynamics of marine ecosystems.
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Shyam, Radhey, Pramod Kumar e Smita Badola. "Seasonal variation in the planktonic diversity of Tumaria reservoir of Kashipur Uttarakhand India". Environment Conservation Journal 21, n.º 3 (11 de dezembro de 2020): 119–25. http://dx.doi.org/10.36953/ecj.2020.21314.

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Plankton are the microscopic plants and animals found in any aquatic ecosystem. Phytoplankton are microscopic plants while zooplankton are microscopic animals. The present investigation was carried out to find out the planktonic diversity of the Tumaria reservoir during January-December 2018. To fulfill the objectives of the present study, samples were collected from Tumaria reservoir on monthly basis. The samples were analysed for various physicochemical parameters (temperature, transparency, TDS, TS, pH, DO and chloride) and planktonic diversity. During the present study phytoplankton and zooplankton were identified under the microscope with the help of standard photographs following standard reference materials. During course of study phytoplankton was observed were Chlorophyceae (50%) > Bacillariophyceae (37%) > Cyanophyceae (13%) while zooplankton observed were Rotifera (40%) > Protozoa (34%) > Cladocera (23%) > Copepod (3%). It was also found that plankton diversity was found higher during the winter months followed by summer and minimum during the monsoon months. Planktonic diversity observed during study was found strongly correlated with temp (r= -0.56) and transparency (r=0.95).
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Teses / dissertações sobre o assunto "Planktonic ecosystem"

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Kim, Hey-Jin. "Climate impacts on the planktonic marine ecosystem in the Southern California current". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3307584.

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Thesis (Ph. D.)--University of California, San Diego, 2008.
Title from first page of PDF file (viewed July 18, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
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Sakai, Yoichiro. "Spatio-temporal dynamics of planktonic food webs in the coastal ecosystem of Lake Biwa". 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180371.

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Drexel, Jan Peter. "Contribution of Nitrogen Fixation to Planktonic Food Webs North of Australia". Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19733.

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Nitrogen fixation is no longer considered to be a minor factor of the nitrogen cycle in oceanic ecosystems. Recent geochemical and biological efforts have led to a significant increase in the estimated input of nitrogen to marine ecosystems by biological fixation, while molecular studies have increased our knowledge of the number and diversity of nitrogen fixers known to be active in the ocean. Although Trichodesmium spp. have long been viewed as the primary marine nitrogen fixers, recent efforts have shown that various members of the picoplankton community are also actively involved in nitrogen fixation. The relative abundance of different nitrogen fixers is an important ecosystem parameter since nitrogen fixers may differ significantly in their physiology, life history and ecology. Here we combine rate measurements and stable isotope natural abundance measurements to constrain the impact of N2 fixation in the waters north of Australia. Samples were collected in the Coral, Arafura, and East Timor Seas, thus spanning three distinct hydrographic regions. Our data show that Trichodesmium has a significant influence on the stable nitrogen isotope ratios of particulate and zooplankton biomass and suggest that Trichodesmium is a significant source of nitrogen for the pelagic ecosystem. Based on stable carbon isotope ratios, it is also likely that the pathways are indirect and nitrogen fixed by Trichodesmium enters the higher trophic levels via decomposition as dissolved organic and inorganic nitrogen. Picocyanobacteria showed high diazotrophic activity at some stations, but unlike Trichodesmium, their N2 fixation rate was not reflected in the stable N isotope ratios of particulate and zooplankton biomass. Our results suggest an important N contribution to biomass by diazotrophs in the Coral Sea, Arafura Sea and East Timor Sea.
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Chabert, Pierre. "Impact of Synoptic Wind Variability on the Dynamics and Planktonic Ecosystem of the South Senegalese Upwelling Sector". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS096.

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En plus du cycle saisonnier du vent, les systèmes d'upwelling de bord Est des océans subissent des fluctuations à des échelles de temps plus courtes, intrasaisonnières ou synoptiques. Dans cette thèse, nous nous concentrons sur l'impact d'une intensification ou d'une relaxation du vent synoptique sur une période de 5 à 10 jours sur la dynamique et l'écosystème planctonique du secteur d'upwelling du sud Sénégal (SSUS). Ce système possède un plateau continental particulièrement peu profond et est situé au sud de l'abrupte péninsule du Cap-Vert, qui casse la continuité de la ligne de côte. Notre objectif est d'apporter des connaissances supplémentaires sur ce système d'upwelling côtier qui, malgré son importance, a reçu peu d'attention, en particulier aux échelles de temps synoptiques. Pour étudier cela, nous développons une expérience de modélisation qui consiste à appliquer une intensification et une relaxation idéalisées du vent synoptique à un ensemble d'états climatologiques du SSUS. Les fluctuations synoptiques ont un impact sur toutes les variables dynamiques et façonnent des anomalies robustes des structures spatiales à l'échelle du système et à la méso-échelle. En appliquant un bilan de chaleur de la couche mélangée, nous identifions l'importance des processus horizontaux et l'importance très localisée des processus verticaux dans la variabilité du SSUS. Aussi, nous constatons que les biomasses planctoniques oscillent dans l'espace et le temps en réponse aux fluctuations synoptiques. La perturbation atmosphérique est amortie lors de sa propagation vers les niveaux trophiques supérieurs de l'écosystème. La réponse de l'écosystème planctonique est complexe et hétérogène sur le plateau, avec un comportement distinct sur le plateau interne. Un bilan des diatomées révèle que leur biomasse est principalement contrôlée par la production primaire, le broutage du zooplancton et la mortalité-agrégation. L'équilibre entre ces processus est responsable des réponses oscillatoires de la biomasse des diatomées aux événements synoptiques. Toutes les variables dynamiques et biogéochimiques présentent de modestes asymétries entre les réponses d'intensification et de relaxation du vent. Cela supporte l'hypothèse selon laquelle la variabilité synoptique a un impact seulement modeste sur l'état moyen climatologique. Les implications de nos résultats pour les futures questions de recherche sont discutées, notamment l'importance des observations biogéochimiques et les avancées de la modélisation des écosystèmes planctoniques
In addition to the wind seasonal cycle, Eastern Boundary Upwelling Systems undergo fluctuations at shorter synoptic to intraseasonal time scales. This thesis focuses on the impact of synoptic wind intensifications and relaxations with a period of 5-10 days on the dynamics and planktonic ecosystem of the South Senegalese Upwelling Sector (SSUS). This system is located south of the sharp Cape Verde peninsula which acts as an abrupt coastline break and has a particularly shallow continental shelf. We aim to bring additional knowledge on this important coastal upwelling system that has received little attention, especially at synoptic time scales. To investigate this, we develop a modeling framework that involves applying idealized synoptic wind intensification and relaxation to an ensemble of climatological SSUS states. Synoptic fluctuations impact all dynamical variables out of their intrinsic variability range and shape robust anomalies of SSUS-scale and mesoscale spatial patterns. Using a mixed layer heat bud- get over the shelf, we identify the importance of horizontal processes in the SSUS heat variability and the very localized importance of vertical processes. Plankton biomass are found to oscillate in space and time in response to synoptic wind fluctuations. The atmospheric perturbation is damped during its propagation towards the upper trophic levels of the ecosystem. The response of the planktonic ecosystem is complex and heterogeneous over the shelf, with a distinctive inner shelf behavior. A diatoms budget reveals that their biomass is primarily controlled by primary production, zooplankton grazing and mortality-aggregation. The balance between these processes is responsible for the oscillatory responses of the diatoms biomass to synoptic wind events. All dynamical and biogeochemical variables exhibit modest asymmetries between wind intensification and relaxation responses. This brings support to the hypothesis that synoptic variability has a modest net impact on the climatological mean state. The implications of our results for future research questions are discussed, including the importance of biogeochemical observations and advances in plankton ecosystem modeling
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Rykaczewski, Ryan Ross. "Influence of oceanographic variability on the planktonic prey and growth of sardine and anchovy in the California current ecosystem". Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3354961.

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Thesis (Ph. D.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed June 16, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
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Kretschmer, Kerstin [Verfasser], Michael [Akademischer Betreuer] Schulz, Michael [Gutachter] Schulz e Gerold [Gutachter] Wefer. "Global assessment of species-specific habitats of planktonic foraminifera : an ecosystem modeling approach / Kerstin Kretschmer ; Gutachter: Michael Schulz, Gerold Wefer ; Betreuer: Michael Schulz". Bremen : Staats- und Universitätsbibliothek Bremen, 2017. http://d-nb.info/1153119374/34.

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Aquino, Camila Akemy Nabeshima. "A distribuição funcional do fitoplâncton prediz a variabilidade ambiental entre dois rios subtropicais". Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3482.

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Phytoplankton traits diversity provides a powerful means to addressing ecology’s questions, and can be 43 adopted to simplify and predict the community structure, in function of the multiples environmental filters 44 that operate in the different ecosystems. Thus, we evaluated the response of phytoplankton functional 45 groups of two subtropical rivers in a temporal scale, identifying the main environmental filters associated 46 with the presence of the different groups and their functional traits during a seasonal cycle. Using 47 multivariate analysis, we found an environmental dissimilarity predicted by the presence of different 48 functional groups in the rivers. Six GFs were recorded: J (chlorophyceans chlorococcales), M (colonial 49 cyanobacteria), N (desmids), W1 (euglenophyceans), X2 (flagellated unicellular chlorophyceans) and F 50 (flagellated colonial chlorophyceans). The GFs J, M and N were exclusive to the first river, while X2 and 51 F were exclusive to the second river. GF W1 was recorded in both rivers, however, its greatest 52 contribution occurred to the second river. Thus, the GFs reflected the environmental dissimilarity, mainly 53 related to the conditions of water flux, conductivity, light availability and depth of the environments. In 54 view of the obtained results, the functional grouping considered a relevant tool in phytoplankton ecology, 55 offers a practical means to investigating the relation between phytoplankton and ecosystem functioning, 56 and consequently can assist in decision-making for the management and conservation of the biodiversity 57 in lotic environments
A diversidade dos traços fitoplanctônicos fornece um poderoso recurso para abordar as questões da 13 ecologia e pode ser adotada para simplificar e prever a estrutura da comunidade, em função dos múltiplos 14 filtros ambientais que operam nos diferentes ecossistemas. Assim, avaliamos a resposta dos grupos 15 funcionais fitoplanctônicos de dois rios subtropicais em escala temporal, identificando os principais filtros 16 ambientais associados à presença dos diferentes grupos e seus traços funcionais durante um ciclo sazonal. 17 Com a análise multivariada, encontramos uma dissimilaridade ambiental prevista pela presença de 18 diferentes grupos funcionais nos rios. Foram registrados seis GFs: J (clorofíceas clorococcales), M 19 (cianobactérias coloniais), N (desmídias), W1 (euglenofíceas), X2 (clorofíceas unicelulares flageladas) e 20 F (clorofíceas coloniais flageladas). Os GFs J, M e N eram exclusivos do primeiro rio, enquanto X2 e F 21 eram exclusivos do segundo rio. GF W1 foi registrado em ambos os rios, no entanto, a maior contribuição 22 ocorreu no segundo rio. Assim, os GFs refletiram a dissimilaridade ambiental, principalmente relacionada 23 às condições de fluxo de água, condutividade, disponibilidade de luz e profundidade dos ambientes. Em 24 vista dos resultados obtidos, o agrupamento funcional considerado uma ferramenta relevante na ecologia 25 do fitoplâncton, oferece um meio prático para investigar a relação entre o fitoplâncton e o funcionamento 26 do ecossistema e consequentemente pode auxiliar na tomada de decisões para a gestão e conservação da 27 biodiversidade em ambientes lótico
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Haupt, Florian. "Plankton vertical migrations - Implications for the pelagic ecosystem". Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-135130.

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Yool, Andrew. "The dynamics of open-ocean plankton ecosystem models". Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/1129/.

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Leach, Taylor Hepburn. "Cause and Consequences of Spatial Dynamics of Planktonic Organisms in Lake Ecosystems". Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1479747973843758.

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Livros sobre o assunto "Planktonic ecosystem"

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Tamminen, Timo, e H. Kuosa, eds. Eutrophication in Planktonic Ecosystems: Food Web Dynamics and Elemental Cycling. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1493-8.

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Yool, Andrew. The dynamics of open-ocean plankton ecosystem models. [s.l.]: typescript, 1997.

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Gin, Karina Y. H. Microbial size spectra from diverse marine ecosystems. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1996.

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Heiskanen, Anna-Stiina. Sedimentation and recycling in aquatic ecosystems: The impact of pelagic processes and planktonic food web structure. Helsinki: Finnish Environment Institute, 1999.

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International PELAG Symposium (4th 1996 Helsinki, Finland). Eutrophication in planktonic ecosystems: Food web dynamics and elemental cycling : proceedings of the Fourth International PELAG Symposium, held in Helsinki, Finland, 26-30 August 1996. Dordrecht: Kluwer Academic Publishers, 1998.

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6

Dalziel, Robert Ian Ralph. The role of planktonic heterotrophic bacteria in lake ecosystem trophic dynamics. 1985.

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7

Sheppard, Charles. 5. Microbial and planktonic engines of the reef. Oxford University Press, 2014. http://dx.doi.org/10.1093/actrade/9780199682775.003.0005.

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Symbiotic algae are a crucial source of fuel for the reef, via corals and others, but how is the food and energy from the corals transferred to other parts of the ecosystem to support the huge abundance and diversity seen there? ‘Microbial and planktonic engines of the reef’ describes the filter feeding—extracting particles from the water—of the large proportion of reef animals. These particles consist of plankton, microbes, bacteria, viruses, and zooplankton. Sponges also display microbial symbiotic connections with algae and cyanobacteria that is a key component of material and energy transfer. The productivity from seaweeds on which numerous species of herbivorous fish and sea urchins graze is also important.
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Tamminen, T., e H. Kuosa. Eutrophication in Planktonic Ecosystems: Food Web Dynamics and Elemental Cycling. Springer London, Limited, 2013.

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9

Tamminen, T., e H. Kuosa. Eutrophication in Planktonic Ecosystems: Food Web Dynamics and Elemental Cycling. Springer, 2014.

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10

Tamminen, T., e H. Kuosa. Eutrophication in Planktonic Ecosystems: Food Web Dynamics and Elemental Cycling. Springer Netherlands, 2011.

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Capítulos de livros sobre o assunto "Planktonic ecosystem"

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Elser, James J. "Stoichiometric Analysis of Pelagic Ecosystems: The Biogeochemistry of Planktonic Food Webs". In Methods in Ecosystem Science, 389–406. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1224-9_27.

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Kraberg, Alexandra, e Gesche Krause. "Alien Planktonic Species in the Marine Realm: What Do They Mean for Ecosystem Services Provision?" In Atlas of Ecosystem Services, 225–31. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-96229-0_35.

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Chakraborty, Kunal, Linta Rose, Trishneeta Bhattacharya, Jayashree Ghosh, Prasanna Kanti Ghoshal e Anirban Akhand. "Primary Productivity Dynamics in the Northern Indian Ocean: An Ecosystem Modeling Perspective". In Dynamics of Planktonic Primary Productivity in the Indian Ocean, 169–90. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34467-1_8.

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Mandal, Sajib, M. S. Islam e M. H. A. Biswas. "Modeling and Analytical Analysis of the Effect of Atmospheric Temperature to the Planktonic Ecosystem in Oceans". In Applications of Internet of Things, 131–40. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6198-6_12.

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Singh, Tarkeshwar, e Punyasloke Bhadury. "Exploring the Diversity of Marine Planktonic Cyanobacterial Assemblages in a Mangrove Ecosystem: Integration of Uncultured and Cultured Approaches". In The Role of Microalgae in Wastewater Treatment, 199–209. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1586-2_15.

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Bakker, C., e M. Vink. "Nutrient concentrations and planktonic diatom-flagellate relations in the Oosterschelde (SW Netherlands) during and after the construction of a storm-surge barrier". In The Oosterschelde Estuary (The Netherlands): a Case-Study of a Changing Ecosystem, 101–16. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1174-4_9.

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Lumini, A., e L. Nanni. "Ocean Ecosystems Plankton Classification". In Recent Advances in Computer Vision, 261–80. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03000-1_11.

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Robertson, A. I., e S. J. M. Blaber. "Plankton, epibenthos and fish communities". In Tropical Mangrove Ecosystems, 173–224. Washington, D. C.: American Geophysical Union, 1992. http://dx.doi.org/10.1029/ce041p0173.

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Stockner, John G., e Karen G. Porter. "Microbial Food Webs in Freshwater Planktonic Ecosystems". In Complex Interactions in Lake Communities, 69–83. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3838-6_5.

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Fujii, Masanori, Toshihide Hirao, Hisaya Kojima e Manabu Fukui. "Planktonic Bacterial Communities in Mountain Lake Ecosystems". In Structure and Function of Mountain Ecosystems in Japan, 145–69. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55954-2_7.

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Trabalhos de conferências sobre o assunto "Planktonic ecosystem"

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Lu, Yunxiang, Min Xiao, Gong Chen, Binbin Tao, Shi Chen e Jiaxuan Liu. "Turing Instability Analysis of Marine Planktonic Ecosystem Under the Influence of Spatial Heterogeneity". In 2021 33rd Chinese Control and Decision Conference (CCDC). IEEE, 2021. http://dx.doi.org/10.1109/ccdc52312.2021.9601965.

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Haydenok, N., V. Chumakov e I. Chumakov. "The study of the planktonic copepod Heterocopе Borealis in the ecosystem of the Krasnoyarsk reservoir". In INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE “INNOVATIVE TECHNOLOGIES IN AGRICULTURE”. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0166585.

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Semenova, Olga. "Analysis of the ecological condition of water and bottom substrates of the lower Dniester by the method of biotesting on microalgae". In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.14.

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In the autumn-spring periods 2018 - 2020. biotesting of water and bottom sediments of the lower Dniester and Ukrainian coastal waters of the Dniester region of the Black Sea was carried out by biotesting on a laboratory culture of planktonic algae Desmodesmus communis. The assessment of the ecological and toxicological situation and a comparative analysis of indicators of the level of pollution of the ecosystem of the “lower reaches of the Dniester” testify to the chronic pollution of this ecosystem by dangerous toxicants, acute toxicity occurs only during peak periods, while chronic toxicity is constantly manifested. It was found that in the overwhelming majority of water areas with different nature of anthropogenic factors and anthropogenic load, there were no toxic substances. Hazardous pollutants were more often found in the surface water layer of the zones affected by urban wastewaters on the Ukrainian coast of the Dniester region of the Black Sea.
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Yamazaki, Hidekatsu, Scott Gallager, Mamoru Tanaka e Kunihisa Yamaguchi. "A cabled observatory system for integrated long term, high-frequency biological, chemical, physical measurement for understanding planktonic ecosystem". In 2016 Techno-Ocean (Techno-Ocean). IEEE, 2016. http://dx.doi.org/10.1109/techno-ocean.2016.7890692.

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Zhang, Yanxu. "Bioaccumulation of Methylmercury in a Marine Plankton Ecosystem". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3140.

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Dyomin, V. V., I. G. Polovtsev, N. S. Kirillov, A. Yu Davydova e A. S. Olshukov. "DHC sensor for the study of rhythmic processes of autochthonous plankton". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/3d.2022.jw2a.48.

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The paper presents a sensor complex based on the digital holographic camera used to study the rhythmic processes in plankton ecosystems through the example of summer natural testing on the Lake Baikal.
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Ohman, M. D., B. E. Lavaniegos, G. H. Rau e E. Brinton. "Climate change effects on planktonic ecosystems: a five decade perspective from CalCOFI". In Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492). IEEE, 2003. http://dx.doi.org/10.1109/oceans.2003.178249.

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Denman, Kenneth, T. Malone, S. Sathyendranath, M. E. Sieracki e E. Vanden Burghe. "Observing Planktonic Ecosystems: Needs, Capabilities, and a Strategy for the Next Decade". In OceanObs'09: Sustained Ocean Observations and Information for Society. European Space Agency, 2010. http://dx.doi.org/10.5270/oceanobs09.pp.15.

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Rubtsova, Svetlana, Svetlana Rubtsova, Natalya Lyamina, Natalya Lyamina, Aleksey Lyamin e Aleksey Lyamin. "ANALYSIS OF THE FUNCTIONING OF MARINE ECOSYSTEMS ON CHANGING THE PARAMETERS OF THE BIOLUMINESCENCE FIELD ON THE CRIMEAN BLACK SEA SHELF". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9387ec5c97.58539127.

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The concept of a new approach to environmental assessment is offered in the system of integrated management of the resource and environmental safety of the coastal area of the Black Sea. The studies of the season and daily changeability in the bioluminescence field in the Sevastopol coastal waters has been conducted. For the first time considerable differences in the bioluminescence field seasonal changes in the surface and deep water layers and the reasons conditioning this phenomenon have been shown, using a method of multidimensional statistical analysis. The bioluminescence field vertical profile change in the Black sea coastal waters in the autumn period at night has been studied. It has been shown that according to the character of bioluminescence parameters dynamics a water column can be divided into layers: upper (0 – 35 m) and deep water (36 – 60 m). It has been revealed that life rhythms of the plankton community are the main reason for the bioluminescence field intensity variability. It has been revealed that 14-hour periodicity of the bioluminescence field is related to the changes in light and its variations with 2,5…4,5 hours are conditioned by planktonts endogenous daily rhythms. And here biotic factors effect mostly periodicity of the bioluminescence field intensity increase and fall down at the dark time of the day. Abiotic factors are of less importance in circadian rhythmic of the bioluminescence field in the neritic zone.
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Rubtsova, Svetlana, Svetlana Rubtsova, Natalya Lyamina, Natalya Lyamina, Aleksey Lyamin e Aleksey Lyamin. "ANALYSIS OF THE FUNCTIONING OF MARINE ECOSYSTEMS ON CHANGING THE PARAMETERS OF THE BIOLUMINESCENCE FIELD ON THE CRIMEAN BLACK SEA SHELF". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43168bfc21.

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The concept of a new approach to environmental assessment is offered in the system of integrated management of the resource and environmental safety of the coastal area of the Black Sea. The studies of the season and daily changeability in the bioluminescence field in the Sevastopol coastal waters has been conducted. For the first time considerable differences in the bioluminescence field seasonal changes in the surface and deep water layers and the reasons conditioning this phenomenon have been shown, using a method of multidimensional statistical analysis. The bioluminescence field vertical profile change in the Black sea coastal waters in the autumn period at night has been studied. It has been shown that according to the character of bioluminescence parameters dynamics a water column can be divided into layers: upper (0 – 35 m) and deep water (36 – 60 m). It has been revealed that life rhythms of the plankton community are the main reason for the bioluminescence field intensity variability. It has been revealed that 14-hour periodicity of the bioluminescence field is related to the changes in light and its variations with 2,5…4,5 hours are conditioned by planktonts endogenous daily rhythms. And here biotic factors effect mostly periodicity of the bioluminescence field intensity increase and fall down at the dark time of the day. Abiotic factors are of less importance in circadian rhythmic of the bioluminescence field in the neritic zone.
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Relatórios de organizações sobre o assunto "Planktonic ecosystem"

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TITAN SYSTEMS INC LA JOLLA CA. Optimized Plankton Ecosystem Dynamics Model. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1989. http://dx.doi.org/10.21236/ada221503.

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Axenrot, Thomas, e Erik Degerman. Ontogenetic variation in lacustrine European smelt (Osmerus eperlanus) populations as a response to ecosystem characteristics : an indicator of population sensitivity to environmental and climate stressors. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2024. http://dx.doi.org/10.54612/a.5qdiolcgj2.

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Smelts play a key role in the pelagic ecosystem of large lakes in northern Europe and North America. In numbers, they often dominate the open water. In large lakes in Scandinavia (including Finland), European smelt (Osmerus eperlanus L.), a cold-water glacial relict, is commonly the most important prey for piscivorous fish species, but also acts by ontogenetic shifts as a predator on zoo-plankton, small crustaceans, fish larvae, mysids and occasionally – with increasing size - fish. Furthermore, the large numbers of smelt in the open water are important competitors to other planktivorous fish. Due to the diverse life histories and biological interactions of smelt in large lakes, its role in the food-web structure is expected to be variable. Smelt population dynamics, recruitment, size and age structure, growth, life history and mortality were analysed and compared for five Swedish lakes that varied in size, depth, morphology, trophic status and latitude to understand the varying life histories and roles in lake food-webs. The results showed that in shallow, eutrophic lakes smelt stayed small and short-lived, and populations experienced high mortality. In deeper, colder and less nutrient-rich lakes, smelts grew larger and older, and might shift to a piscivorous trophic level. By ontogenetic adaptions smelt seems to uphold high abundance and recruitment over a wide range of ecosystems, but in shallow lakes without cold water refuges smelt populations run the risk of collapsing on the occasion of extremely warm summers with drastic consequences for their predators and lake ecosystems.
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Klinger, Richard. Bachelor-MARSYS education cruise in the Baltic Sea Cruise No. AL577, 28.07. – 08.08.2022, Kiel (Germany) – Kiel (Germany) BALTEACH - 1. Institute for Marine Ecosystem and Fishery Science, Kiel, Germany, 2022. http://dx.doi.org/10.3289/cr_al577.

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During this teaching cruise, bachelor students of the Institute of Marine Ecosystem and Fishery Science (IMF) were supposed to get the opportunity to learn about the most commonly used scientific methods, gears and working procedures on board of a research vessel for fisheries science as well as biological oceanography. In order to achieve a great number of students participating a teaching cruise, this one has been split in half. Thus a change of 7 students has been realizable in Rønne, on the Danish island Bornholm. The scientific objective of the cruise was the investigation of distribution patterns of certain spawning fish species, such as cod, whiting, sprat, plaice, flounder and dab in the Kiel, Arkona and with special focus within the Bornholm Basin. In addition to fisheries, a comprehensive grid of plankton net stations was sampled in order to gain insights into the spatial distribution of fish eggs, planktivorous prey (larval to adult life stages) cod larvae and plankton distribution (most important for sprat) within the Bornholm Basin. Of special interest were picoplankton communities´ short term responses (on board) to temperature along the respective gradient in the Baltic Sea with an additional sampling scheme to later isolate Ostreococcus sp. and its associated viruses for future laboratory studies at the Institute for Marine Ecosystem and Fishery Science. (Alkor-Berichte ; AL577)
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Taucher, Jan, e Markus Schartau. Report on parameterizing seasonal response patterns in primary- and net community production to ocean alkalinization. OceanNETs, novembro de 2021. http://dx.doi.org/10.3289/oceannets_d5.2.

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We applied a 1-D plankton ecosystem-biogeochemical model to assess the impacts of ocean alkalinity enhancement (OAE) on seasonal changes in biogeochemistry and plankton dynamics. Depending on deployment scenarios, OAE should theoretically have variable effects on pH and seawater pCO2, which might in turn affect (a) plankton growth conditions and (b) the efficiency of carbon dioxide removal (CDR) via OAE. Thus, a major focus of our work is how different magnitudes and temporal frequencies of OAE might affect seasonal response patterns of net primary productivity (NPP), ecosystem functioning and biogeochemical cycling. With our study we aimed at identifying a parameterization of how magnitude and frequency of OAE affect net growth rates, so that these effects could be employed for Earth System Modell applications. So far we learned that a meaningful response parameterization has to resolve positive and negative anomalies that covary with temporal shifts. As to the intricacy of the response patterns, the derivation of such parameterization is work in progress. However, our study readily provides valuable insights to how OAE can alter plankton dynamics and biogeochemistry. Our modelling study first focuses at a local site where time series data are available (European Station for Time series in the Ocean Canary Islands ESTOC), including measurements of pH, concentrations of total alkalinity, dissolved inorganic carbon (DIC), chlorophyll-a and dissolved inorganic nitrogen (DIN). These observational data were made available by Andres Cianca (personal communication, PLOCAN, Spain), Melchor Gonzalez and Magdalena Santana Casiano (personal communication, Universidad de Las Palmas de Gran Canaria). The choice of this location was underpinned by the fact that the first OAE mesocosm experiment was conducted on the Canary Island Gran Canaria, which will facilitate synthesizing our modelling approach with experimental findings. For our simulations at the ESTOC site in the Subtropical North Atlantic we found distinct, non-linear responses of NPP to different temporal modes of alkalinity deployment. In particular, phytoplankton bloom patterns displayed pronounced temporal phase shifts and changes in their amplitude. Notably, our simulations suggest that OAE can have a slightly stimulating effect on NPP, which is however variable, depending on the magnitude of OAE and the temporal mode of alkalinity addition. Furthermore, we find that increasing alkalinity perturbations can lead to a shift in phytoplankton community composition (towards coccolithophores), which even persists after OAE has stopped. In terms of CDR, we found that a decrease in efficiency with increasing magnitude of alkalinity addition, as well as substantial differences related to the timing of addition. Altogether, our results suggest that annual OAE during the right season (i.e. physical and biological conditions), could be a reasonable compromise in terms of logistical feasibility, efficiency of CDR and side-effects on marine biota. With respect to transferability to global models, the complex, non-linear responses of biological processes to OAE identified in our simulations do not allow for simple parameterizations that can easily adapted. Dedicated future work is required to transfer the observed responses at small spatiotemporal scales to the coarser resolution of global models.
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Funk, Steffen, e Felix Mittermayer. Biological oceanography and fishery science practical at Sea in the framework of the SeaRanger educational programme, Cruise No. AL607, February 10th – February 16th 2024, Kiel (Germany) – Kiel (Germany), SeaRanger. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. http://dx.doi.org/10.3289/cr_al607.

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This cruise was conducted as part of the educational training of fishers in the framework of the transdisciplinary SeaRanger program which is scientifically accompanied by the Institute of marine ecosystem and fisheries Science (IMF) at the University of Hamburg (UHAM), the Christian-Albrechts University Kiel, Centre for Ocean and Society (CeOS), the Thuenen-Institute for Baltic Sea fisheries (TI-OF), and the German Centre for Integrative Biodiversity Research (iDiv) in the framework of the joint project SpaCeParti (Coastal Fishery, Biodiversity, Spatial Use and Climate Change: A Participative Approach to navigate the Western Baltic Sea into a Sustainable Future; Grant no. 03F0914) funded by the BMBF. In order to give the fishermen as realistic an application of the standard monitoring techniques as possible, the trip was planned in such a way that the training part was integrated into a scientific monitoring programme focussing on the spawning activity of fish in the Belt Sea. By sampling a standardised station grid contributing to the joint long-term sampling efforts in the Western Baltic Sea which are internationally coordinated by the WBCF (Western Baltic cod Forum), the fishers learned how plankton, fish and water samples are taken, preserved, and analysed and gained a comprehensive insight into the hydrography and fauna of the western Baltic. Similar to the previous cruise AL606 in January 2024 conducted by the IMF no cod larvae and generally less larvae compared to previous years were observed in the Bongo 500 μm net samples from the Plankton grid stations, potentially indicating a delayed spawning activity of fish in the Belt Sea potentially related to the comparably low water temperatures in winter 2023/24. (Alkor-Berichte ; AL607)
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