Journal articles: 'Aquatic ecosystem'

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De, Mitu, Chayanika Roy, Suchismita Medda, Sulagna Roy, and Santi Ranjan Dey. "Diverse role of Macrophytes in aquatic ecosystems: A brief review." INTERNATIONAL JOURNAL OF EXPERIMENTAL RESEARCH AND REVIEW 19 (August 30, 2019): 40–48. http://dx.doi.org/10.52756/ijerr.2019.v19.005.

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The aquatic ecosystem is composed of aquatic flora and fauna which interact together in maintaining the aquatic ecosystem. Aquatic macrophytes are macroscopic forms of aquatic vegetation, including macro algae, mosses, ferns and angiosperms found in aquatic habitat. Macrophytes of freshwater ecosystems have diverse roles to play in the structure and functioning of these aquatic ecosystems. The depth, density, diversity and types of macrophytes present in a system are indicators of water body health. Aquatic vegetation can influence the water quality too. Macrophytes are considered as an important component of the aquatic ecosystem as the habitat and food source for aquatic life. Of all the biological treatments for controlling eutrophication, submerged macrophytes, has been recognized as being the most effective. This paper is a brief review of the diverse role of macrophytes in an aquatic ecosystem.

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Cahya Putri Rifiah, Amelia, Sacinta Julia Astasagita, and Rony Irawanto. "PEMULIHAN PERAIRAN TERCEMAR MENGGUNAKAN MAKROFITA AIR." Prosiding SEMSINA 4, no. 01 (December 9, 2023): 314–21. http://dx.doi.org/10.36040/semsina.v4i01.8117.

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Indonesia possesses a potential and diverse biodiversity of plants that can be utilized as phytoremediation agents. One of the ecosystems frequently encountering pollution is the aquatic ecosystem. Therefore, this research is conducted to identify the diversity of aquatic macrophytes with the potential for water remediation efforts. The method employed is qualitative descriptive based on literature review. The literature study revealed 30 species of aquatic macrophytes, with 15 species prominently utilized for environmental remediation. Among these, Ipomea aquatica and Scirpus grossus emerge as the most widely employed aquatic macrophytes.

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Chai, Xeai Li, H. Rohasliney, and I. S. Kamaruddin. "Evaluating the Tropical Reservoir Health by using the Index of Biotic Integrity as a Management Tool for Resource Conservation Planning." Sains Malaysiana 51, no. 12 (December 31, 2022): 3897–907. http://dx.doi.org/10.17576/jsm-2022-5112-03.

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Biotic Integrity index (IBI) is widely utilized for biomonitoring in aquatic ecosystems, especially in assessing aquatic ecosystem health worldwide. Environmental changes significantly impact the aquatic ecosystem’s health of Subang Reservoir, which consequently affects the aquatic biodiversity. This study was conducted to determine its ecosystem’s health by assessing the IBI of freshwater fish in Subang Reservoir. In this study, thirty-four metrics were firstly selected as candidate metrics, and later, these thirty-four metrics underwent several statistical tests such as range, responsiveness, redundancy, and metrics scoring to screen and select the most appropriate metrics. A final eight metrics were selected after the statistical analysis, and a total score of 24 indicated that the Subang Reservoir’s ecosystem shows some stress due to an imbalanced fish guild. This showed that the ecosystem’s health of Subang Reservoir is in fair condition. This is because of the limitation of fish entering Subang Reservoir. The implementation of biomonitoring can be improved by modifying and selecting the most appropriate techniques, and the usage of biomonitoring can be increased in Malaysia’s freshwater ecosystems. The result reported in this study can be used as a scientific base data for implementing biomonitoring.

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Ellsworth, J. "Systemic Barriers to the Restoration of Aquatic Ecosystems." Water Quality Research Journal 32, no. 2 (May 1, 1997): 235–44. http://dx.doi.org/10.2166/wqrj.1997.017.

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Abstract An ecosystem perspective is interdisciplinary and holistic, recognizing the interconnections among ecosystem components. The ecosystem approach incorporates social, economic and environmental elements into its definition (Environment Canada 1995). In instances where ecosystem initiatives fail to generate the body of public and political support necessary to address complex issues, barriers can often be found in the ecosystem initiatives themselves. Systemic barriers to the restoration of aquatic ecosystems are generated by the reluctance of some initiatives to go beyond pure sciences and an inability to integrate social, economic and environmental interests. It is common practice to allow the issues at hand to define the scale of an ecosystem initiative. Experience has shown that the issues at hand can also define the appropriate level of engagement. This paper explores Level 3: Community-Based Ecosystem Initiatives and the qualities that enable Level 3 initiatives to avoid and overcome systemic barriers to the restoration of aquatic ecosystems.

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Korsgaard, Louise, and Jesper S. Schou. "Economic valuation of aquatic ecosystem services in developing countries." Water Policy 12, no. 1 (November 1, 2009): 20–31. http://dx.doi.org/10.2166/wp.2009.124.

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An important challenge of integrated water resources management (IWRM) is to balance water allocation between different users. While economically and/or politically powerful users have well developed methods for quantifying and justifying their water needs, this is not the case for ecosystems—the silent water user. A promising way of placing aquatic ecosystems on the water agenda is by economic valuation of services sustained by ecosystems. In developing countries, the livelihoods of rural people often depend directly on the provision of aquatic ecosystem services. In such situations, economic valuation of ecosystem services becomes particularly challenging. This paper reviews recent literature on economic valuation of aquatic ecosystem services in developing countries. “Market price” is the most widespread method used for valuating marketed ecosystem services in developing countries. “Cost based” and “revealed preference” methods are frequently used when ecosystem services are non-marketed. A review of 27 existing valuation studies reveals a considerable range of estimated total economic value of aquatic ecosystem services in developing countries, that is from US$30 to 3,000/ha/year. The paper concludes that economic valuation is vital for bringing ecosystems to decision-making agendas in developing countries and that great effort must be made to bridge the gap between scientists and decision makers.

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Masser, Janet A., and Wayne F. McDiffett. "Carbon interrelationships in a small aquatic ecosystem." Archiv für Hydrobiologie 108, no. 2 (December 19, 1986): 155–66. http://dx.doi.org/10.1127/archiv-hydrobiol/108/1986/155.

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Moldasheva, R., A. Ismailova, and A. Zadagali. "SIGNS OF STABILITY OF AQUATIC ECOSYSTEMS IN MATHEMATICAL MODELS." Bulletin of the National Engineering Academy of the Republic of Kazakhstan 85, no. 3 (September 15, 2022): 43–48. http://dx.doi.org/10.47533/2020.1606-146x.178.

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To date, various data on water resources have been accumulated, but hydrobiological and hydrochemical indicators remain available to assess the current state of aquatic ecosystems, which can be the basis for assessing the environmental situation within the water body. Systematization of multiyear and diverse data on the lakes and rivers of the country, the use of mathematical tools for assessing and forecasting the state of the aquatic ecosystem is impossible without the use of information and communication technologies. Quality mathematical modeling of aquatic ecosystems and the development of information and analytical system for the study of aquatic ecosystems is an urgent task, including databases of various-quality data on the water body and its ecosystem, data management and processing tools, as well as a set of mathematical models for the functioning of the water body ecosystem. Research is based on information technology, statistical data processing, and mathematical modeling. Mathematical models are based on systems of differential equations, solutions are sought with the help of own computing programs and software suites (Maple, Matlab, Mathematics, etc.). When possible, modeling includes analytical studies of the properties of solutions, primarily this concerns stationary or spatially homogeneous solutions, as well as asymptotic properties of solutions. The lower trophic levels of the water body ecosystem are studied, as this determines the functioning of aquatic ecosystems. The species composition of phytoplankton is an indicator of the ecological state of the water body. Based on the quantitative characteristics of phytoplankton, the bioproductivity of the aquatic ecosystem is calculated. The physical and chemical characteristics of water allow drawing conclusions about the pollution of the water body and the composition of mineral nutrition for phytoplankton.

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Adhikari, Namita Paudel, Subash Adhikari, and Ganesh Paudel. "Bacterial Diversity in Aquatic Ecosystems over the Central Himalayas, Nepal: Progress and Future Perspectives." Janapriya Journal of Interdisciplinary Studies 8 (December 31, 2019): 200–211. http://dx.doi.org/10.3126/jjis.v8i0.27319.

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Nepal hosts a large area of freshwater aquatic ecosystem including glacier associated system like glacier-fed streams and lakes as well as stream fed lowland lakes. Bacteriological studies are very important in aquatic ecosystems as bacteria are the major participants in biogeochemical cycles and food web structures. This study reviewed available literature in bacteriological studies of aquatic ecosystems in the Central Himalayas, Nepal and revealed that such studies are very limited. Thus, we conclude that future research works need to proceed through the latest molecular methods with high throughput technique using multiple environmental factors in the aquatic ecosystem.

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Odume, Oghenekaro Nelson, and Chris de Wet. "A Systemic-Relational Ethical Framework for Aquatic Ecosystem Health Research and Management in Social–Ecological Systems." Sustainability 11, no. 19 (September 25, 2019): 5261. http://dx.doi.org/10.3390/su11195261.

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This paper argues that if the goal of slowing global ecological degradation, and of sustained improvement in aquatic ecosystem health is to be achieved, then a departure is required from the traditional, discipline-focused approach to aquatic ecosystem health research and management. It argues that a shift needs to be made towards systemic, integrative, and holistic approaches, drawing on diverse disciplines, with values and ethics as fundamental to such approaches. The paper proposes the systemic-relational (SR) ethical framework to aquatic ecosystem health research and management as an essential contribution to addressing the potential intractability of the continuing deterioration of aquatic ecosystem health. The framework recognises the centrality of values in aquatic ecosystem health management, and the role of ethics in negotiating, and constructively balancing, conflicting values to realise healthy ecosystems in social–ecological systems (SES). The implications of the framework in terms of the research-practice interface, decision making, policy formulation, and communication are discussed.

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Zhao, Jianguo, Cunqi Liu, Hongbo Li, Jing Liu, Tiantian Jiang, Donghua Yan, Jikun Tong, and Li Dong. "Review on Ecological Response of Aquatic Plants to Balanced Harvesting." Sustainability 14, no. 19 (September 30, 2022): 12451. http://dx.doi.org/10.3390/su141912451.

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Macrophytes are the main primary producers in lake ecosystems and are the main transmitters of material and energy flows in lake ecosystems, directly influencing the structure and function of lake ecosystems. The balanced harvesting of aquatic plants is a cost-effective scientific management approach to maintain ecosystem health. The article defines “balanced harvesting” as an aquatic plant harvesting technique to optimize the structure of aquatic plant communities, maintain the normal function of the ecosystem material cycle and energy flow, and enhance the stability and resilience of the system. The ecological significance of balanced harvesting in regulating the evaporation coefficient of the subsurface, reducing the accumulation and release of endogenous nutrient loads in lakes, delaying the evolutionary process of marshification, inhibiting biological filling, increasing biodiversity and system stability, and improving the environment of water bodies under the natural laws of adapted aquatic plants is reviewed. The way, time, and method of the balanced harvesting of aquatic plants in Baiyangdian, a grass-type lake in the north, were analyzed in order to provide an important reference for wetland ecological restoration and protection, maintaining the health of the aquatic ecosystem, and making the lake environment sustainable.

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Diamond, Jerry. "Applied aquatic ecosystem concepts." Journal of the North American Benthological Society 20, no. 3 (September 2001): 501–2. http://dx.doi.org/10.2307/1468044.

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Sánchez-Carrillo, Salvador, and Miguel Álvarez-Cobelas. "Stable isotopes as tracers in aquatic ecosystems." Environmental Reviews 26, no. 1 (March 2018): 69–81. http://dx.doi.org/10.1139/er-2017-0040.

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The addition of stable isotopes (SI) of 13C and 15N has been used to study several aquatic processes, thus avoiding environmental disturbance by the observer. This approach, employed for the last three decades, has contributed to expanding our knowledge of food-web ecology and nutrient dynamics in aquatic systems. Currently, SI addition is considered a powerful complementary tool for studying several ecological and biogeochemical processes at the whole-aquatic-ecosystem scale, which could not be addressed otherwise. However, their contributions have not been considered jointly nor have they been evaluated with a view to assessing the reliability and scope of their results from an ecosystem perspective. We intend to bridge this gap by providing a comprehensive review (78 scientific publications reporting in situ 13C/15N additions at the whole-aquatic-ecosystem scale) addressing the main results arising from their use as tracers. Specifically, we focus on: (i) reasons for SI additions at the whole-ecosystem scale to study ecological processes, (ii) the paradigms resulting from its use and the insights achieved, (iii) uncertainties and drawbacks arising from these SI addition experiments, and (iv) the potential of this approach for tackling new paradigms. SI tracer addition at the ecosystem scale has provided new functional insights into numerous ecological processes in aquatic sciences (importance of subsidies in lakes; heterotrophy dominance in benthic food webs in lakes, wetlands and estuaries; the decrease in N removal efficiency in most aquatic ecosystems due to anthropogenic alteration; the recognition of hyporheic zones and floodplains as hot spots for stream denitrification; and high rates of internal N recycling in tidal freshwater marshes). However, certain constraints such as the high cost of isotopes, the maintenance of the new isotopic steady state, and avoidance of biomass changes in any compartment or pool during tracer addition bear witness to the difficulties of applying this approach to all fields of aquatic ecology and ecosystems. The future development of this approach, rather than expanding to larger and complex aquatic ecosystems, should include other stable isotopes such as phosphorus (P18O4).

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GJONI, VOJSAVA, STAMATIS GHINIS, MAURIZIO PINNA, LUCA MAZZOTTA, GABRIELE MARINI, MARIO CIOTTI, ILARIA ROSATI, FABIO VIGNES, SERENA ARIMA, and ALBERTO BASSET. "Patterns of functional diversity of macroinvertebrates across three aquatic ecosystem types, NE Mediterranean." Mediterranean Marine Science 20, no. 4 (December 20, 2019): 703. http://dx.doi.org/10.12681/mms.19314.

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This study is focused on investigating the variation patterns of macroinvertebrate guilds functional structure, in relation to the taxonomic one, across aquatic ecosystem types along the salinity gradient from freshwater to marine and the resulting implications on guild organization and energy flows. Synoptic samplings have been carried out using the leaf-pack technique at 30 sites of the aquatic ecosystems of the Corfu Island (Greece), including freshwater, lagoon, and marine sites. Here, we analyzed the macroinvertebrate guilds of river, lagoon, and marine ecosystems, as: i. taxonomic composition and population abundance ii. trophic guilds composition and relative abundance; and iii. body size spectra and size patterns. The following variation patterns across the three ecosystem types were observed: a. trophic guild composition and body size spectra were more conservative than taxonomic composition within and among ecosystem types, where, trophic guild and size spectra composition were more similar between river and lagoon ecosystem types than with marine ones; b. a dominance on resource exploitation of large species over smaller ones was inferred at all sites; and, c. higher body size-specific density of individuals was consistently observed in lagoon than in freshwater and marine ecosystems. Results extend previous findings suggesting a common hierarchical organization of benthic macroinvertebrate guilds in aquatic ecosystems and showing that lagoon ecosystems have higher energy density transferred to benthic macroinvertebrates than both freshwater and marine ecosystem types.

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Stief, P. "Stimulation of microbial nitrogen cycling in aquatic ecosystems by benthic macrofauna: mechanisms and environmental implications." Biogeosciences 10, no. 12 (December 2, 2013): 7829–46. http://dx.doi.org/10.5194/bg-10-7829-2013.

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Abstract. Invertebrate animals that live at the bottom of aquatic ecosystems (i.e., benthic macrofauna) are important mediators between nutrients in the water column and microbes in the benthos. The presence of benthic macrofauna stimulates microbial nutrient dynamics through different types of animal–microbe interactions, which potentially affect the trophic status of aquatic ecosystems. This review contrasts three types of animal–microbe interactions in the benthos of aquatic ecosystems: (i) ecosystem engineering, (ii) grazing, and (iii) symbiosis. Their specific contributions to the turnover of fixed nitrogen (mainly nitrate and ammonium) and the emission of the greenhouse gas nitrous oxide are evaluated. Published data indicate that ecosystem engineering by sediment-burrowing macrofauna stimulates benthic nitrification and denitrification, which together allows fixed nitrogen removal. However, the release of ammonium from sediments is enhanced more strongly than the sedimentary uptake of nitrate. Ecosystem engineering by reef-building macrofauna increases nitrogen retention and ammonium concentrations in shallow aquatic ecosystems, but allows organic nitrogen removal through harvesting. Grazing by macrofauna on benthic microbes apparently has small or neutral effects on nitrogen cycling. Animal–microbe symbioses provide abundant and distinct benthic compartments for a multitude of nitrogen-cycle pathways. Recent studies reveal that ecosystem engineering, grazing, and symbioses of benthic macrofauna significantly enhance nitrous oxide emission from shallow aquatic ecosystems. The beneficial effect of benthic macrofauna on fixed nitrogen removal through coupled nitrification–denitrification can thus be offset by the concurrent release of (i) ammonium that stimulates aquatic primary production and (ii) nitrous oxide that contributes to global warming. Overall, benthic macrofauna intensifies the coupling between benthos, pelagial, and atmosphere through enhanced turnover and transport of nitrogen.

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Stief, P. "Stimulation of microbial nitrogen cycling in aquatic ecosystems by benthic macrofauna: mechanisms and environmental implications." Biogeosciences Discussions 10, no. 7 (July 15, 2013): 11785–824. http://dx.doi.org/10.5194/bgd-10-11785-2013.

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Abstract. Invertebrate animals that live at the bottom of aquatic ecosystems (i.e., benthic macrofauna) are important mediators between nutrients in the water column and microbes in the benthos. The presence of benthic macrofauna stimulates microbial nutrient dynamics through different types of animal–microbe interactions, which potentially affect the trophic status of aquatic ecosystems. This review contrasts three types of animal–microbe interactions in the benthos of aquatic ecosystems: (i) ecosystem engineering, (ii) grazing, and (iii) symbiosis. Their specific contributions to the turnover of fixed nitrogen (mainly nitrate and ammonium) and the emission of the greenhouse gas nitrous oxide are evaluated. Published data indicate that ecosystem engineering by sediment-burrowing macrofauna stimulates benthic nitrification and denitrification, which together allows fixed nitrogen removal. However, the release of ammonium from sediments often is enhanced even more than the sedimentary uptake of nitrate. Ecosystem engineering by reef-building macrofauna increases nitrogen retention and ammonium concentrations in shallow aquatic ecosystems, but allows organic nitrogen removal through harvesting. Grazing by macrofauna on benthic microbes apparently has small or neutral effects on nitrogen cycling. Animal-microbe symbioses provide abundant and distinct benthic compartments for a multitude of nitrogen-cycle pathways. Recent studies revealed that ecosystem engineering, grazing, and symbioses of benthic macrofauna significantly enhance nitrous oxide emission from shallow aquatic ecosystems. The beneficial effect of benthic macrofauna on fixed nitrogen removal through coupled nitrification–denitrification can thus be offset by the concurrent release of (i) ammonium that stimulates aquatic primary production and (ii) nitrous oxide that contributes to global warming. Overall, benthic macrofauna intensifies the coupling between benthos, pelagial, and atmosphere through enhanced turnover and transport of nitrogen.

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Kolmakova, V., and O. Botsula. "Structure of payments for the use of resources and services of aquatic ecosystems." Balanced nature using, no. 1 (February 14, 2023): 36–44. http://dx.doi.org/10.33730/2310-4678.1.2023.278537.

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The importance of developing and optimizing the structure of a modern payment system, which will facilitate not only the accumulation of these funds in the budget, but also to make relevant management decisionson their allocation for conservation measures and restoration of lost aquatic ecosystem functions was demonstrated. The methodological and theoretical basis of the study is the key concepts of modern economic theory, economics of environmental management and sustainable development, international ecosystem ecosystem accounting, institutional and neo-institutional theories related to the problem of scientific substantiation of payments for the use of resources and services of aquatic ecosystems. The key elements of the structure of payments for the use of water resources in Ukraine (rent for special water use, environmental tax for discharges of pollutants into water bodies, rent for water bodies, fines) are studied and analytical evaluation of these taxes were studied and performed their analytical evaluation. The main factors of low efficiency of payments for the use of aquatic ecosystem resources are identified. It is proposed scientific concepts to optimize the structure of payments for the use of resources and services of aquatic ecosystems taking into account the best models of international experience. Attention was focused on the necceserity of the creation in Ukraine a special extra-budgetary National Environmental Fund of Water Resources in the form of a legal entity, similar to the National Fund for Environmental Protection and Water Management in Poland, with the aim of accumulating payments for water ecosystem services and introducing tools to stimulate and support water protection measures. Perspectives for further research on this issue, in particular, with regard to the formation of a comprehensive strategic ecosystem approach to the introduction of payments for the use of resources and services of aquatic ecosystems, development of modern methodological approaches to assessing the services of aquatic ecosystems and formation of an optimal structure of payments for the use of water resources, taking into account their functional characteristics were identified.

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Likens, Gene E., Keith F. Walker, Peter E. Davies, Justin Brookes, Jon Olley, William J. Young, Martin C. Thoms, et al. "Ecosystem science: toward a new paradigm for managing Australia's inland aquatic ecosystems." Marine and Freshwater Research 60, no. 3 (2009): 271. http://dx.doi.org/10.1071/mf08188.

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Freshwater ecosystems are a foundation of our social, cultural, spiritual and economic well being. The degraded condition of many of Australia’s river ecosystems is testament to our failure to manage these resources wisely. Ecosystem science involves the holistic study of complex biophysical systems to understand the drivers that influence ecological pattern and process. Ecosystem science should underpin both water management and policy. Our understanding of aquatic ecosystems lags behind the increasing problems caused by past land and water management. Current post-graduate training programmes will not provide the aquatic ecosystem scientists needed by government and management agencies to prevent further degradation. We advocate new initiatives to capture the skills, knowledge and innovation of our research community by engaging scientists and managers in large-scale, long-term ecosystem science programmes across Australia and to integrate these programmes with community aspirations, policy, planning and management. We call on management agencies to increase their support for and uptake and use of ecosystem science. We also advocate establishment of national archives for long-term ecologically-relevant data and samples, and clear custodial arrangements to protect, update and facilitate knowledge-transfer. These initiatives need to be supported by more extensive, better-funded post-graduate and post-doctoral programmes in ecosystem science and management.

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Jeeda, Rashi, and Prachetas Jai Patel. "An interview with Dr. Emma J. Rosi: On ecosystem effects of pharmaceutical contamination." MIT Science Policy Review 4 (August 31, 2023): 25–30. http://dx.doi.org/10.38105/spr.74q3nss5qz.

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MIT Science Policy Review spoke with Dr. Emma J. Rosi to better understand how commonly used pharmaceutical and personal care products enter freshwater ecosystems, as well as the challenges this contamination introduces for ecosystem health and policy development. Dr. Emma J. Rosi is a well-established aquatic ecologist with over 20 years of research experience in aquatic ecosystems. She is currently a senior scientist at the Cary Institute of Ecosystem Studies, where she spearheads a research group that is working to understand how pharmaceutical and personal products impact the health of rivers in the context of current wastewater infrastructure and urbanization. She also contributes her expertise to the U.S. Environmental Protection Agency (EPA) as a member of its Science Advisory Board. Moreover, she was the Director of the Baltimore Ecosystem Study (BES), a National Science Foundation Long Term Ecological Research Site. She discusses the challenges and opportunities that could potentially face policymakers working towards preserving the health of aquatic ecosystems in urban environments.

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Radulescu, Dragos Mihai, Alina Roxana Banciu, Catalina Stoica, Monica Alexandra Vaideanu, Laura Novac, Luoana Florentina Pascu, and Mihai Nita-Lazar. "Natural and anthropic aquatic ecosystems – structural differences in bacterial populations." Romanian Journal of Ecology & Environmental Chemistry 4, no. 2 (December 28, 2022): 87–95. http://dx.doi.org/10.21698/rjeec.2022.208.

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The hydrosphere represents about 71% of the total surface of the planet of which only 2.8% is represented by freshwater ecosystems. The ecosystem maintains a state of balance between the component populations, throughout its self-control function, maintaining the numerical variations of these populations within certain limits of sustainability. The exceeding of these limits could causes the balance disturbance by changing the structure and functioning of the ecosystem. The complex human activities influence the structure and functioning of ecosystems, transforming the environment and adapting it to its purposes. Microorganisms are present in all types of ecosystems, being endogenous, exogenous or transient due to contamination with various sources of pollution. Water is an essential natural factor of ecological balance increasingly exposed to microbial pollution. Indicators of fecal pollution are used to assess the degree of water contamination and to locate its origin. The continuous and uncontrolled usage of antibacterial agents that contributed to bacterial resistance determined/ caused pollution of aquatic ecosystems with antibiotic resistant microorganisms. The emergence of antibiotic resistant bacteria is predictable in any environment given that the use of antibacterial substances is constantly growing worldwide. Thus, antibiotic resistance induced in the aquatic environment can have an effect both on bacterial populations in the ecosystem and on human health. Aquatic environments are recognized as one of the reservoirs for the transmission and dissemination of antibiotic resistance. The main goal of this paper is to highlight the differences of bacterial communities from anthropogenic and natural aquatic ecosystems and to assess the potential impact they have on environment and human health. The study area focused on two lakes in Bucharest, Lake Morii (anthropic) and Lake Snagov (natural). Microbiological and molecular biology methods were applied for a bacterial communities’ characterization. The fecal indicators were quantified by Most Probable Number method. The identification and characterization of bacterial populations in both aquatic ecosystems (Morii Lake and Snagov Lake) were performed by Omnilog (Biolog, USA) and by iSeq100 (Illumina, USA) gene sequencing techniques from bacterial aquatic ecosystem. Antibiotic susceptibility was tested following CLSI recommendation.

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Aliyu, M. A., A. Y. Maharazu, K. Suleiman, and B. Y. Lawan. "Biophysical Mapping and Land Use Attributes of Kano Ecosystems, North-western Nigeria." Bayero Journal of Pure and Applied Sciences 14, no. 2 (July 6, 2022): 115–24. http://dx.doi.org/10.4314/bajopas.v14i2.14.

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The study examines the terrestrial ecosystems component in Kano, Nigeria. The study employed direct digitization using latest Google Earth Image (version 10.3) and National Space Research Development Agency (NASRDA) land use map of the state. Simple descriptive statistics was also used to evaluate units of ecosystems indentified. The results revealed 16 ecosystems of land units within Kano terrestrial ecosystems. Mapping of the study area also revealed anthropogenic cultivation ecosystem Major category of 18,542km2 representing 89% while aquatic ecosystem covered a total 506 km2 with altitude elevation of 480above the sea level (a.s.l.). Shelterbelts and wind breaks were 458 - 498 a.s.l. with >100 approximate number of patches. Results were discussed and concluded as Kano ecosystem land use attributes revealed an interdependence of units with major terrestrial and minor aquatic ecosystems with the serious anthropogenic interferences which result in systemic loss of valuable units of ecosystems, ecosystem services and biodiversity components. Therefore, government should embark on mass awareness campaign on proper land use and sustainable environmental policies framework in the state should be enacted.

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Jorgensen, S. E. "Recent Trends in the Development of Ecological Models Applied on Aquatic Ecosystems." Scientific World JOURNAL 2 (2002): 387–406. http://dx.doi.org/10.1100/tsw.2002.89.

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This paper presents an overview of the application of models on aquatic ecosystems. More than 17% of the models published in the focal journal in the field, Ecological Modelling, are aquatic ecosystem models. An increasing number of papers are dealing with the theoretical aspects of modeling – new modeling approaches and techniques, how models can be used to reveal ecosystem properties, and how models can better reflect the properties of ecosystems. This development implies that today we have more types of models. The characteristics, the advantages, and the disadvantages of these model types are presented briefly. The selection criteria for the presented model types are discussed, and the application of these types to models for aquatic ecosystems is reviewed. A recent improvement in model calibration of particular interest for aquatic ecosystems is presented, and the perspectives resulting from this new calibration procedure and from possible hybrids of the presented model types are discussed.

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Schnedler-Meyer, Nicolas Azaña, Tobias Kuhlmann Andersen, Fenjuan Rose Schmidt Hu, Karsten Bolding, Anders Nielsen, and Dennis Trolle. "Water Ecosystems Tool (WET) 1.0 – a new generation of flexible aquatic ecosystem model." Geoscientific Model Development 15, no. 9 (May 13, 2022): 3861–78. http://dx.doi.org/10.5194/gmd-15-3861-2022.

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Abstract. We present the Water Ecosystems Tool (WET) – a new generation of open-source, highly customizable aquatic ecosystem model. WET is a completely modularized aquatic ecosystem model developed in the syntax of the Framework for Aquatic Biogeochemical Models (FABM), which enables coupling to multiple physical models ranging from zero to three dimensions, and is based on the FABM–PCLake model. The WET model has been extensively modularized, empowering users with flexibility of food web configurations, and incorporates model features from other state-of-the-art models, with new options for nitrogen fixation and vertical migration. With the new structure, features and flexible customization options, WET is suitable in a wide range of aquatic ecosystem applications. We demonstrate these new features and their impacts on model behavior for a temperate lake for which a model calibration of the FABM–PCLake model was previously published and discuss the benefits of the new model.

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Kerna, Ashley, Bonnie Colby, and Francisco Zamora. "Cultural and Recreational Values for Environmental Flows in Mexico's Colorado River Delta." Water Economics and Policy 03, no. 02 (April 2017): 1650035. http://dx.doi.org/10.1142/s2382624x16500351.

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Worldwide, aquatic ecosystems subsist on water leftover from agricultural, industrial, and municipal water uses. While bi-national agreements have temporarily provided water for the Colorado River Delta (Delta) in Mexico, dedication of water to support aquatic ecosystems is rare. High-level U.S. – Mexico negotiations are underway to consider whether and how to provide water for the Delta once the current pilot program ends in 2017. Better understanding of the value of aquatic ecosystems can be useful in securing water to sustain them. This paper reports research findings on values held by visitors from nearby Mexican communities for environmental flows in the Delta. Based on surveys conducted at five recreation locations, this contingent valuation methodology (CVM) study assesses visitors' willingness-to-pay (WTP) for an assured source of water to sustain the Delta's ecosystem and the recreational opportunities it provides. Results indicate strong support for Delta restoration, with the majority of respondents indicating positive WTP to ensure adequate amounts of water to sustain a healthy and vibrant Delta ecosystem. Econometric model results indicate a median WTP ranging from $97 to $168 MXN (approximately $7–$13 USD at the time of analysis) per car per entry. These values represent only a subset of recreational users, and recreation values are only one of many components of the ecosystem services provided by the Delta. While only a fraction of recreation value and total economic value, it is important to understand values held by local recreation visitors. These values gauge support for preserving aquatic ecosystems in nearby communities. Furthermore, values held in the local area affect water management and policy decisions regarding restoration of this unique aquatic ecosystem.

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Teixeira, Heliana, Ana I. Lillebø, Fiona Culhane, Leonie Robinson, Daniel Trauner, Florian Borgwardt, Mathias Kuemmerlen, et al. "Linking biodiversity to ecosystem services supply: Patterns across aquatic ecosystems." Science of The Total Environment 657 (March 2019): 517–34. http://dx.doi.org/10.1016/j.scitotenv.2018.11.440.

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Culhane, Fiona, Heliana Teixeira, Antonio J. A. Nogueira, Florian Borgwardt, Daniel Trauner, Ana Lillebø, GerJan Piet, et al. "Risk to the supply of ecosystem services across aquatic ecosystems." Science of The Total Environment 660 (April 2019): 611–21. http://dx.doi.org/10.1016/j.scitotenv.2018.12.346.

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Shao, N. F., S. T. Yang, Y. Sun, Y. Gai, C. S. Zhao, F. Wang, X. Yin, and B. Dong. "Assessing aquatic ecosystem health through the analysis of plankton biodiversity." Marine and Freshwater Research 70, no. 5 (2019): 647. http://dx.doi.org/10.1071/mf18342.

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Healthy plankton communities are the foundation of many freshwater food webs. Their biodiversity is often used to directly reflect the health of the rivers. Globally, river ecosystem restoration is a critical issue and many freshwater ecosystems, especially in cities, are degraded because of intensive human activities. This is true for Jinan, China’s first pilot city for the Water Ecological Civilisation Project. The outcomes of aquatic ecosystem restoration in the city will directly affect the success or failure of the construction of aquatic ecological civilisations across the entire country; therefore, there is an urgent need for research on the assessment of river health in Jinan based on plankton biodiversity. As such, this study gathered data on the distribution of plankton (phytoplankton and zooplankton) in Jinan by collecting three sets of samples from 59 aquatic ecosystem monitoring stations in spring, summer and autumn of 2015. In all, 104 species of phytoplankton and 56 species of zooplankton were identified. Diatoms, Chlorophyta, and Cyanophyta accounted for 50, 31 and 15% respectively of phytoplankton, and rotifers, Protozoa and cladocerans accounted for 39, 31 and 17% respectively of zooplankton. We constructed a plankton health assessment model based on the Shannon–Wiener diversity index for analysis of the temporal and spatial distribution. According to the overall health distribution diagram, spatially health status was significantly better in north and south Jinan than in the city centre; temporally, spring water ecosystem health was better than in summer and autumn. These conclusions provide a theoretical basis and direction for the restoration of aquatic ecosystems in Jinan, and the methods used in this study can serve as a reference for aquatic ecosystem evaluation in developing countries.

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Panikkar, Preetha, M. Feroz Khan, U. K. Sarkar, and B. K. Das. "Changing foodwebs of Indian aquatic ecosystems under the threats of invasive species: An overview." Aquatic Ecosystem Health & Management 24, no. 2 (April 1, 2021): 24–32. http://dx.doi.org/10.14321/aehm.024.02.06.

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Abstract Biological invasions are a worldwide threat to the aquatic systems and have the potential to homogenize entire foodwebs and shift species abundance distributions to more skewed ones. Invasion impacts include effects on the foodweb structure and ecosystem functioning leading to a loss in native fish biodiversity and commercially important fisheries in many open water systems. The impacts of invasives are generally devastating as they spread in the foodweb with each species potentially interacting with multiple species. The foodweb modeling studies conducted in different inland aquatic ecosystems show that not all exotics cause a detrimental effect on the resilience of an ecosystem. Information on the foodweb structure and ecosystem properties is a prerequisite for formulating management protocols for conserving biodiversity, enhancement programmes and sustaining fisheries. The present paper reviews the impacts of invasive fishes in Indian aquatic ecosystems in the context of a changing foodweb scenario due to exotic fish species invasions. The information generated here could be applied for future research on similar ecosystems for deducing management actions.

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France, R. L., and R. H. Peters. "Ecosystem differences in the trophic enrichment of 13C in aquatic food webs." Canadian Journal of Fisheries and Aquatic Sciences 54, no. 6 (June 1, 1997): 1255–58. http://dx.doi.org/10.1139/f97-044.

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Data from 35 published studies were collated to examine patterns in the trophic enrichment of 13C of consumers. Because both delta 13C and delta 14N vary systematically across ecosystems, it was necessary to standardize for such differences before combining data from numerous sources. Relationships of these measures of ecosystem-standardized delta 13C to ecosystem-standardized trophic position ( DELTA delta 15N) for freshwater, estuarine, coastal, and open-ocean and for all aquatic ecosystems yielded regression equations of low predictive capability (average of 20% explained variance in delta 13C). However, differences were observed in the slopes between delta 13C and standardized trophic position when data were examined study-specifically: the average trophic fractionation of 13C was found to increase from + 0.2omicron for freshwater to + 0.5omicron for estuarine to + 0.8omicron for coastal, and to + 1.1omicron for open-ocean food webs. This ecosystem-specific gradient in 13C enrichment for consumers supports previous findings of a similar continuum existing for zooplankton - particulate organic matter differences in delta 13C. Possible mechanisms to explain these ecosystem-specific patterns in 13C enrichment may be related to the relative importance of detritus, heterotrophic respiration, partial reliance on alternative food sources, and lipid influences in the different ecosystems.

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V, DabholkarAakshay, Takadehiraj D, TodkarPremraj S, and V. Jayashree. "AQUATIC ECOSYSTEM MONITORING REMOTE VEHICLE." International Journal of Advanced Research 6, no. 5 (May 31, 2018): 1086–95. http://dx.doi.org/10.21474/ijar01/7132.

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Guseynov, Sharif E., and Jekaterina V. Aleksejeva. "Mathematical Modelling of Aquatic Ecosystem." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2015): 92. http://dx.doi.org/10.17770/etr2015vol3.192.

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In present paper we consider the complete statements of initial-boundary problems for the modelling of various aspects of aqueous systems in Latvia. All the proposed models are the evolutionary models: all they are nonstationary and continuous qualitative models having the dynamic parameters and aimed at analysis, evaluation and forecast of aqueous systems (reservoirs, lakes and seas). In constructing these mathematical models as research tools classic apparatus of differential equations (both ODE and PDE) as well as apparatus of mathematical physics were used.

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Csák, Csilla. "The protection of aquatic ecosystem." Journal of Agricultural and Environmental Law = Agrár- és Környezetjog, no. 27 (2019): 7–38. http://dx.doi.org/10.21029/jael.2019.27.7.

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Kadhum Alzurfi, Sadiq, Jaafar B. Algburi, Murtdha Mohammed Taher, Laith Hemed Alhachami, and Karrar A. Zwain. "Mollusca Diversity in Aquatic Ecosystem." Journal of Engineering and Applied Sciences 14, no. 4 (November 10, 2019): 7277–83. http://dx.doi.org/10.36478/jeasci.2019.7277.7283.

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Zarull, Michael A., and John H. Hartig. "Quantifying aquatic ecosystem health targets." SIL Proceedings, 1922-2010 27, no. 4 (December 2000): 2346–48. http://dx.doi.org/10.1080/03680770.1998.11901659.

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Park, Young-Seuk. "Aquatic ecosystem assessment and management." Annales de Limnologie - International Journal of Limnology 52 (2016): 61–63. http://dx.doi.org/10.1051/limn/2016008.

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Silow, Eugene A., and Oh In-Hye. "Aquatic ecosystem assessment using exergy." Ecological Indicators 4, no. 3 (September 2004): 189–98. http://dx.doi.org/10.1016/j.ecolind.2004.03.003.

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Rypel, Andrew L., and Craig A. Layman. "Degree of aquatic ecosystem fragmentation predicts population characteristics of gray snapper (Lutjanus griseus) in Caribbean tidal creeks." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 3 (March 1, 2008): 335–39. http://dx.doi.org/10.1139/f07-192.

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Ecosystem fragmentation is one of the most damaging anthropogenic impacts to aquatic and terrestrial ecosystems worldwide. In this study, we analyzed population-level characteristics of a resilient top predator, the gray snapper (Lutjanus griseus), across a gradient of fragmentation in Bahamian tidal creeks. Analysis of hydrologic connectivity (the inverse of fragmentation) and site-specific population parameters revealed that varying degrees of connectivity translated into predictable characteristics in fish populations. Less-fragmented systems produced fast-growing snapper with high condition factors, whereas more fragmented tidal creeks yielded slow-growing snapper with low condition factors. Underlying reasons for growth rate differences likely originated from structural and functional shifts in tidal creek ecosystems following fragmentation. Such ecosystem-level shifts were reflected by low per-individual volumes of consumed prey, as well as increased parasite infestations. Results indicated that aquatic ecosystem fragmentation may affect long-term fitness and viability of resilient species capable of persisting in fragmented habitats. Our results from estuarine tidal creeks compare well with studies on fragmentation of freshwater streams by dams and suggest that population-level consequences following ecosystem fragmentation may be generalizable between seemingly disparate aquatic environments.

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Roux, D. J., C. J. Kleynhans, and C. Thirion. "Biological monitoring and assessment of rivers as a basis for identifying and prioritising river management options." Water Science and Technology 39, no. 10-11 (May 1, 1999): 207–10. http://dx.doi.org/10.2166/wst.1999.0657.

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The output of monitoring programmes such as the National Aquatic Ecosystem Biomonitoring Programme must be used in the management of aquatic ecosystems. To achieve this, collected data must, through a systematic framework, be linked to measurable management objectives. This paper demonstrates how the results obtained with biological indices and system-specific knowledge, are combined to derive semi-quantitative assessments of ecosystem condition. These assessments provide the basis for responding to the results of a river monitoring programme.

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Nagoli, Joseph, Lucy Binauli, and Asafu Chijere. "Inclusive Ecosystems? Women’s Participation in the Aquatic Ecosystem of Lake Malawi." Environments 6, no. 1 (December 28, 2018): 3. http://dx.doi.org/10.3390/environments6010003.

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Ecosystem services and their role in alleviating poverty are centered on a set of gendered social relations. The understanding of these relations between men and women in aquatic ecosystems can unveil gender-based opportunities and constraints along the value chains of the ecosystem services. A gender discourse perspective on participation of actors of an ecosystem can further facilitate the understanding of the complex and subtle ways in which gender is represented, constructed, and contested. This paper analyses the barriers to the participation of women in the fishing industry. The analysis is based on a study conducted in five fishing villages of Lake Malawi through a structured questionnaire, focus group discussions, key informant interviews, and observations. First, it looks at gender and participation from a theoretical perspective to explain how gender manifests itself in participation and interrogates why women have limited benefits from the fishing industry. Second, it highlights the barriers that seem to preclude women from participating, which include institutional embedded norms, financial, socio-cultural, and reproduction roles. In general, women had little influence on the type of fishing sites, markets, and access to financing of their businesses. A gender transformative agenda is therefore required to proactively facilitate changes of some entrenched institutional norms as well as having greater access to financial services and new technologies in order to enhance women’s full participation and equal benefits from ecosystem services.

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Rusyn, Bohdan, Olga Alokhina, Mykola Korus, Daria Ivchenko, and Natalia Pits. "Analytical Hierarchy Method for Evaluating the Environmental Sustainability in the Context of Ecosystem Services Enhancing: A Case Study of the Biosphere Reserve, Ukraine." Environmental and Climate Technologies 27, no. 1 (January 1, 2023): 912–27. http://dx.doi.org/10.2478/rtuect-2023-0067.

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Abstract The ability of natural systems to provide services is critical to the sustainability of the environment. The increasing environmental pressures necessitate the creation of conditions conducive to the preservation and sustainability of natural ecosystems. A review of similar studies reveals that when evaluating ecosystem services, more consideration should be given to evaluating ecosystem stability. The Ukrainian Biosphere Reserve was chosen as the study polygon due to its importance as a conservation area and the diversity of natural ecosystems. The Analytical Hierarchy Method, in this case, provides a very straightforward way to analyze such complicated systems. The first step is to identify and value the services offered by the Biosphere Reserve’s wetland, forest, and aquatic ecosystems. Then, four criteria (C1–C4) and impacts (P1–Pn) that directly affect the ecological sustainability of a certain ecosystem within each criterion were identified. The overall weight of each impact on specific ecosystem sustainability was computed and estimated to reach the main goal (G). The integrated ecological stability evaluation index (CEI) was then calculated using the overall weight values. Wetland and forest ecosystem indices were calculated to be 0.63 and 0.64, indicating that these systems are moderately stable. The stability index for aquatic ecosystems is 0.75, indicating that the system is ecologically stable. As a result, it is critical to focus on reducing negative factors affecting wetlands and forest ecosystems, such as sylvatization and/or recreational activities, to strengthen ecosystem stability and the ability to provide services.

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Preeti, Adhana, Singh Kalpana, and Garg Vandana. "Microplastics and it’s Impact on Aquatic Environment." International Journal of Zoological Investigations 08, no. 02 (2022): 100–106. http://dx.doi.org/10.33745/ijzi.2022.v08i02.013.

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Microplastics (MPs), a small piece (<5mm) of plastic debris, are amongst the most serious threats to aquatic ecosystems. These are commonly found in aquatic environments due to the widespread use of plastic items. Plastic components are broken down from the large fragments into small fragments during the treatment procedure in treatment plants of wastewater, these plants can operate as the entry points for the MPs into the aquatic ecosystem; so it is necessary that MPs must be removed from the wastewater during the treatment process. However, there is not sufficient data available about MPs’ impact on the ecological services cascade and how it is linked with the declining biodiversity. This review examines the outcomes of MPs in the aquatic environment, their role as carriers, and the possible influence of MPs on aquatic biota. In this review detailed overview of existing knowledge regarding MP aggregation in the aquatic ecosystem is provided.

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Hamza, Waleed. "Aquatic Ecosystem Health and Management Society: A global integration of aquatic ecosystems research and development." Aquatic Ecosystem Health & Management 16, no. 2 (April 2013): 143–45. http://dx.doi.org/10.1080/14634988.2013.797780.

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Tekade, Rita S., and Pravin M. Telkhade. "Studies on diversity of aquatic insects in Tamasi lake, Tahsil- Bhadravati, Dist- Chandrapur (M.S) India." Environment Conservation Journal 25, no. 1 (January 12, 2024): 156–59. http://dx.doi.org/10.36953/ecj.26672645.

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Aquatic insects are found abundantly and exhibits high diversity in fresh water aquatic ecosystems. They serve as food item for the vertebrate and invertebrate predators and thus play a significant role in aquatic ecosystem. Insects responded well to a wide range of environmental disturbances and thus often are employed as proxies for water quality. The present study was carried out at Tamasi Lake, situated in Bhadravati Taluka of Chandrapur district, Maharashtra which comes under Tribal area. The year round investigation was carried out to evaluate the diversity of aquatic insects for a period of one year from June 2022 to May 2023. The present investigation shows the presence of total 28 species of aquatic insects from 5 orders and 18 families. The rich and varied diversity of aquatic insects indicate the moderate environmental condition of freshwater ecosystem under study and functioning properly.

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P S, Dr Anju, and Dr Jaya D S. "Impacts of Clay Mining Activities on Aquatic Ecosystems: A Critical Review." International Journal of Engineering and Advanced Technology 11, no. 4 (April 30, 2022): 128–34. http://dx.doi.org/10.35940/ijeat.d3495.0411422.

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The unconsolidated earth surface is a rich source of minerals, of which clay is one of the richest natural minerals, having various natural and anthropogenic properties. Natural clay is widely available as a cheaper resource, which is non toxic to ecosystems and has the property of preserving ground water and aquifers. At the same time, the ubiquitous and widespread occurrence of clay will have the property to control toxic materials. The uncontrolled exploitation or mining of clay minerals will affect the aquatic ecosystem's sustainability in many ways. Water quality is very essential for the healthy environment and human life, whereas unpredictable conditions like flooding, drought, groundwater loss, loss of biodiversity, and health impacts on the surrounding inhabitants are some of the signs of ecosystem loss. The unwanted mined clay is deposited into the surrounding area of the mining environment, resulting in top soil, ground water, and surface water pollution. The review paper describes the pollution aspects of the aquatic ecosystem with special emphasis on ground water, aquifers, fresh water (lotic and lentic), sediment, and marine ecology and hydrology.

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Klemmer, Amanda J., Mark L. Galatowitsch, and Angus R. McIntosh. "Cross-ecosystem bottlenecks alter reciprocal subsidies within meta-ecosystems." Proceedings of the Royal Society B: Biological Sciences 287, no. 1929 (June 17, 2020): 20200550. http://dx.doi.org/10.1098/rspb.2020.0550.

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Reciprocal subsidies link ecosystems into meta-ecosystems, but energy transfer to organisms that do not cross boundaries may create sinks, reducing reciprocal subsidy transfer. We investigated how the type of subsidy and top predator presence influenced reciprocal flows of energy, by manipulating the addition of terrestrial leaf and terrestrial insect subsidies to experimental freshwater pond mesocosms with and without predatory fish. Over 18 months, fortnightly addition of subsidies (terrestrial beetle larvae) to top-predators was crossed with monthly addition of subsidies (willow leaves) to primary consumers in mesocosms with and without top predators (upland bullies) in a 2 × 2 × 2 factorial design in four replicate blocks. Terrestrial insect subsidies increased reciprocal flows, measured as the emergence of aquatic insects out of mesocosms, but leaf subsidies dampened those effects. However, the presence of fish and snails, consumers with no terrestrial life stage, usurped and retained the energy within in the aquatic ecosystem, creating a cross-ecosystem bottleneck to energy flow. Thus, changes in species composition of donor or recipient food webs within a meta-ecosystems can alter reciprocal subsidies through cross-ecosystem bottlenecks.

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Schindler, D. W. "Detecting Ecosystem Responses to Anthropogenic Stress." Canadian Journal of Fisheries and Aquatic Sciences 44, S1 (December 18, 1987): s6—s25. http://dx.doi.org/10.1139/f87-276.

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Recent ecological work on aquatic populations, communities, and ecosystems is reviewed for advances which show promise as early indicators of anthropogenic stress in aquatic ecosystems. Work at the Experimental Lakes Area (ELA) in northwestern Ontario indicates that among the earliest of responses to stress are changes in species composition of small, rapidly-reproducing species with wide dispersal powers such as phytoplankton, and the disappearance of sensitive organisms from aquatic communities. Work elsewhere illustrates that the incidence of morphological abnormalities in benthic invertebrates is also highly sensitive to pollution stress. For several categories of pollutants, this sensitivity of benthic organisms may be due to the greater concentrations of pollutants in sediments than in the water column. Variables reflecting ecosystem functions such as primary production, nutrient cycling, and respiration, were not altered by eutrophication, acidification, or cadmium addition at ELA, and are relatively poor indicators of early stress. Species diversity of phytoplankton was also insensitive to low levels of stress. Mesocosm experiments appear to be fruitful for addressing chemical- or plankton-related problems, but are less useful for addressing community- or ecosystem-level questions. Among population-level approaches, life-table population studies of invertebrates appear to be the most sensitive early indicators of stress on ecosystems.Relative sensitivities of freshwater and forested terrestrial ecosystems exposed to airborne pollutants are compared. Primary production seems to be reduced at a much earlier stage of air pollution stress in terrestrial ecosystems than in aquatic systems. Soils, like lake sediments, tend to be sinks for pollutants. This may protect the pelagic regions of lakes from influxes of toxins that would occur if watersheds and sediments were unreactive, but cause additional stresses to the fauna and flora of soils and sediments. In extreme cases, high concentrations of toxins may inhibit the replacement of terrestrial producers.The importance of long-term monitoring in distinguishing natural from anthropogenic stress is discussed. It is suggested that paleoecological techniques be rapidly developed and calibrated with whole-ecosystem experiments to resolve certain inadequacies of past monitoring records.

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Barros, Ana Maria dos Santos, and João Bosco Ladislau Andrade. "Study of the aquatic ecosystem of the Japiim Lagoon in the city of Manaus: water analysis." Revista Científica Multidisciplinar Núcleo do Conhecimento 09, no. 10 (October 31, 2018): 123–37. http://dx.doi.org/10.32749/nucleodoconhecimento/environment/ecosystem-aquatico.

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Shadrin, N. V., and E. V. Anufriieva. "ENVIRONMENTAL MANAGEMENT AND AQUATIC ECOLOGY IN SEARCH OF ANSWERS TO THE CHALLENGES OF THE TIME." Ekosistemy, no. 25 (2021): 30–40. http://dx.doi.org/10.37279/2414-4738-2021-25-30-40.

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Currently, the destruction of landscapes is taking place with a decrease in the sustainability and productivity of natural ecosystems. One of the main reasons for this is inadequate environmental management, which, as a rule, is based on inadequate outdated theoretical ecological concepts. The totality of accumulated data shows that real ecosystems can be in several alternative states and demonstrate relatively rapid changes in the regime of existence with significant, abrupt and permanent changes in structure and functioning. In this regard, the main ecosystem paradigm is currently being revised. From the theoretical concept of the unicity of the ecosystem stable state, ecology moves to the concept of the multiplicity of stable states in the ecosystem. The dynamics of ecosystems can be represented, according to K. Holling, in the form of an adaptation cycle with the alternation of four phases, the features of which are considered. The importance of no return points and possible uncertainty in the dynamics of ecosystems are shown. Ecosystems, in a certain sense, have memory, which is the reason for the hysteresis effect during multidirectional changes in systems. The necessity of developing approaches of adaptive ecosystem management based on this concept is shown. Which is especially important in cases of rapid transformation of natural ecosystems, such, as an example, in the Crimea after the cessation of the supply of Dnieper water to the North Crimean canal. The difficulties of transition to adaptive environmental management in modern conditions are analyzed.

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REYNOLDS, COLIN S., and J. ALEX ELLIOTT. "Complexity and emergent properties in aquatic ecosystems: predictability of ecosystem responses." Freshwater Biology 57 (November 18, 2010): 74–90. http://dx.doi.org/10.1111/j.1365-2427.2010.02526.x.

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Galeeva, Asiya, Nafisa Mingazova, and Iskander Gilmanshin. "Assessment of the bioresource potential of Kazan city’s lake ecosystems by phytoplankton indicators." BIO Web of Conferences 67 (2023): 01018. http://dx.doi.org/10.1051/bioconf/20236701018.

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Nowadays protection and sustainable management of biological resources is of particular importance. The most important area of hydrobiological research is the assessment of the bioresource potential of aquatic ecosystems (Alimov et al., 2005). Phytoplankton is the basis of life and the most important component of the bioresource base in the aquatic ecosystem. Phytoplankton indicators (primarily abundance and biomass) are widely used to assess the bioresource potential of lakes due to its position as an autotrophic producer at the base of the ecological pyramid of the lake ecosystem (Bulion, 2005, 2019; Alimov, 1989, 2000; Alimov et al., 2005). Our study is aimed to research phytoplankton indicators to assess the bioresource potential of Kazan city’s lake ecosystems (Volga region, Russia).

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Al-Saeedi, Hind Mahdi Salih, and Ibrahim M. A. Al Salman. "Biodiversity of Phytoplankton in Two Aquatic Ecosystems (LOTIC and LENTIC) During the Autumn Season." Pakistan Journal of Medical and Health Sciences 16, no. 6 (June 29, 2022): 379–85. http://dx.doi.org/10.53350/pjmhs22166379.

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Phytoplankton have been studied in quantity and quality in two aquatic ecosystems represented by two sites in the lake of Baghdad Island tourist as a lotic ecosystem and two sites of the Tigris River, one north of the lake and the other south as an lentic ecosystem, and the study was conducted in the autumn of 2021, where 69 species were diagnosed in the environment of the two ecosystems studied, distributed to 14 species of Chlorophyta, 21 species of Cyanobacteria, 29 species of diatom (1 belongs to Centrales order and 28 to Pennales order), 3 species of Euglenophyta and two species of the Chrysophyta division. The dominance of algae belonging to the genus of; Pinnularia, Synedra, Ankistrodesmus, Chroococcus, Oscillatoria, Synechacoccns, Navicula and Nitzschia during the autumn period and at all Sites. Some species showed high density such as: Ankistrodesmus falcatus, Chroococcus disperses, Chroococcus minor, Oscillatoria limnetica, Synechacoccns aeruginosus, Navicula sp. and Nitzschia longissima. The quantitative results showed that the mean density of the phytoplankton in the lotic aquatic ecosystem exceeded that the lentic aquatic ecosystem when recorded (378.68 × 103 cells/L and 334.21×103 cells/L) respectively. Air temperature values were recorded (20-36) °C and while water temperature ranged between (16-25.5) °C, NTU (5.8-19.5) 4), TDS (421-620) mg/L, as well as EC (1027-1380) μS/cm, whereas pH value was (7.4-8.4), (DO) (6.4-8.6), and BOD (204-305). Also, by measuring the values of the essential macronutrients for algae growth, it was found that the values of concentrations NO3 (0.468-0.986), PO4- (0.038-0.061) SO4- (175.6-293.37), and SO3 (3.9-6.9) mg/L respectively. Keywords: Phytoplankton, Biodiversity, Lotic Ecosystem, Lentic Ecosystem, Physiochemical factors.

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Journal articles on the topic 'Aquatic ecosystem'

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