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Academic literature on the topic 'Aquatic ecosystems'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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Journal articles on the topic "Aquatic ecosystems"

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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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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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Clifford, Chelsea, and James Heffernan. "Artificial Aquatic Ecosystems." Water 10, no. 8 (August 17, 2018): 1096. http://dx.doi.org/10.3390/w10081096.

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As humans increasingly alter the surface geomorphology of the Earth, a multitude of artificial aquatic systems have appeared, both deliberately and accidentally. Human modifications to the hydroscape range from alteration of existing waterbodies to construction of new ones. The extent of these systems makes them important and dynamic components of modern landscapes, but their condition and provisioning of ecosystem services by these systems are underexplored, and likely underestimated. Instead of accepting that artificial ecosystems have intrinsically low values, environmental scientists should determine what combination of factors, including setting, planning and construction, subsequent management and policy, and time, impact the condition of these systems. Scientists, social scientists, and policymakers should more thoroughly evaluate whether current study and management of artificial aquatic systems is based on the actual ecological condition of these systems, or judged differently, due to artificiality, and consider resultant possible changes in goals for these systems. The emerging recognition and study of artificial aquatic systems presents an exciting and important opportunity for science and society.

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Den Hartog, C. "Managed aquatic ecosystems." Aquaculture 76, no. 1-2 (January 1989): 176–78. http://dx.doi.org/10.1016/0044-8486(89)90264-0.

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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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Lee, Jeounghee. "Report on Eight Unrecorded Species of Freshwater Oligochaetes in Korea." Taxonomy 5, no. 1 (February 17, 2025): 9. https://doi.org/10.3390/taxonomy5010009.

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Freshwater oligochaetes, belonging to the class Oligochaeta, are vital components of aquatic ecosystems globally, contributing significantly to nutrient cycling, sediment dynamics, and overall ecosystem function. Despite their ecological importance, freshwater oligochaetes in Korea remain relatively understudied compared to other aquatic organisms. This study aimed to enhance our understanding of the diversity and ecological roles of freshwater oligochaetes in Korean aquatic ecosystems. We identified nine species across six genera and two subfamilies from samples collected from various freshwater environments in Korea. This research contributes valuable taxonomic knowledge and highlights the ecological significance of freshwater oligochaetes in Korean aquatic ecosystems.

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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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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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Piscart, Christophe, Nadège Belouard, Mathieu Bonnefond, la Brosse Augustin De, Thomas Houet, Nicolas Legay, Mathieu Mandard, Cassandre Murail-Zimmermann, and Benjamin Bergerot. "Ecosystem Services provided by streams to adjacent agricultural terrestrial ecosystems." ARPHA Conference Abstracts 8 (June 2, 2025): e157547. https://doi.org/10.3897/aca.8.e157547.

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Streams are traditionally viewed as receptacles rather than sources of energy with regard to nutrient and energy cycles. For a long time, terrestrial-aquatic interactions have focused on studying the impact of terrestrial ecosystems on aquatic ecosystems, but more and more studies are highlighting the role of aquatic ecosystems on terrestrial ecosystems. Numerous studies have shown that freshwater ecosystems are an important source of energy for the terrestrial environment, mainly through the emergence of winged aquatic insects, recognized as providing nutritional subsidies to terrestrial consumers. They represent a substantial source of fertilization for soils and an important resource for terrestrial organisms. Plants near wetlands where food webs contain fewer insect predators or flying insects receive more pollinator visits and are less pollen limited. Thus, dense hydrographic networks could suggest a strong impact in terms of ecosystem services in adjacent terrestrial ecosystems. The objective of our project is to evaluate three ecosystem services provided by aquatic insects in adjacent agricultural environments following a gradient of agricultural intensification and to analyze their impacts in terms of integration in the management policies of the territories. Five sites located along a gradient of agricultural intensification and in different agricultural contexts where agricultural practices are informed, were selected within three Zones Ateliers from the French Long Term Socio-Ecological Research network. On each site, a headwater stream and its adjacent landscape (1 Km²) will be monitored at the same time (spring and summer) with 13 protocols. The first work package focuses on three ecosystem services provided and mediated by emerging aquatic insects (soil fertilization, pollination and crop pest control). These ecosystem services cannot be studied without an accurate quantification of biodiversity of streams (i.e. emerging aquatic insects and aquatic vegetation), riparian habitats (floral diversity, emerging aquatic insects and terrestrial predators), adjacent agricultural areas (i.e. emerging aquatic insects, terrestrial predators and type of crops) and the quantification of biological flux between aquatic and terrestrial environment. The second WP focuses on the governance of riparian areas. Its objective is to study the history of the governance of French riparian areas, to examine current management practices and their associated representations. This WP will also address recent improvements in the governance of these areas and aims to increase the adoption of ecologically responsible practices by stakeholders. The last WP aims to map Essential Biodiversity Variables (EBVs) of streams and floodplains with high-resolution data and remote sensing techniques and artificial intelligence modelling approach to estimate the respective contribution of various drivers (e.g. landscape features and their arrangement including 3D modelling) . This information is crucial for understanding and linking WP1 and WP2 (i.e. explaining ecosystem services distribution in relation with anthropogenic practices and land uses). Preliminary results suggested a possible important role of aquatic insects in fertilization but a relatively small contribution to direct pollination. We have also highlighted a succession of major changes in river management over the last 100 years, which have profoundly altered the functioning of aquatic ecosystems. However, headwater and riparian habitats are rarely considered in social sciences and limit our ability to integrate their specificities or to mitigate conflicts among users and managers. Ongoing research based a previous discussions with stakeholders, has highlighted that our project should help us to better quantify, in a spatially explicit manner, the relative contribution of freshwaters to ecosystem services in agricultural landscapes, and to better identify leverage points for integrating our results into agricultural practices and environmental management.

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Dissertations / Theses on the topic "Aquatic ecosystems"

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Palesse, Stephanie. "Déterminisme de la décision lysogénique au sein des communautés virales aquatiques : importance des fluctuations physiologiques et métaboliques des hôtes procaryotes." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22520.

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Tan, Xiang. "Environmental Influences on Benthic Algal Communities and their Application for Biomonitoring of Australian and Chinese Rivers." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367601.

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Benthic algae a re one of the most important primary producers i n lotic ecosystems, and changes i n their community structure and function (e.g., metabolism) will influence other organisms at higher trophic levels or even the entire aquatic ecosystem through bottom-up effects. Since they are known to be sensiti ve to changes i n ambient conditions, benthic algae and especially diatoms have been widely used as i ndicators of environmental changes in aquatic ecosystems, particular ly i n E urope , through developi ng diatom-based indices. However, these indices have not been widely used i n other continents. Applications of such i ndices in Asia and Oceania first require testi ng to see whether the y can perform as reliable bioindicators across time and space, considering that aquatic systems are constantly changing in terms of their ambient environment such as water physical and chemical conditions. Nevertheless, few studies have been carried out to compare the environmental influences on benthic algal communities among different geographic regions, nor the influences at different spatial scales (e.g., catchment, reach, and habitat). F urthermore, few studies have considered how diatom indices perform compare with other commonly used bioindicators of aquatic ecosystem health.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>Griffith School of Environment.<br>Science, Environment, Engineering and Technology<br>Full Text

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Perusse, Martin. "Metal cycling in terrestrial and aquatic ecosystems." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59848.

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The present study examines the cycling of elements in the biosphere. The first chapter proposes a theoretical framework for this cycling based on both metal/ligand theory and mass balance studies. Empirical modelling serves as an alternative and complement to mass balance studies in predicting the export of elements from watersheds. Watershed output (export per unit area per unit of time) is predicted using atmospheric deposition rates, an element bonding strength index, the watershed area and a forest classification (deciduous vs coniferous). Finally the last chapter examines, in a speculative fashion, the partitioning of elements between the atmosphere and hydrosphere as a function of element behaviour and discusses the ecological consequences of human activity on this partitioning.

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Gjata, Nerta. "Food Web Simulation Studies on Aquatic Ecosystems." Doctoral thesis, Università degli studi di Trento, 2013. https://hdl.handle.net/11572/367707.

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There is an increasing interest in dynamical food web modeling, and recent advances of computational biology provide new algorithms and tools for modern systems ecology. In this work stochastic individual-based models are used for simulating food web dynamics in two case studies: the Kelian river, in Borneo, Indonesia and a marine ecosystem in Gulf of Guinea. The two cases present effects from human perturbations. In both cases, we constructed food webs, based on real databases. We parameterized the stochastic dynamical model for the system models and performed sensitivity analysis (and community response indicators) in order to quantify the relative importance of system components. The main aims are to understand the importance of functional diversity of aquatic ecosystems and relations between the dynamics of species and the whole community in perturbed ecosystems due to human activities (pollution due to gold mining activity and human settlements in the case of the Kelian river ecosystem and the impact of Fish Aggregation Devices on skipjack tuna communities in the case of the Gulf of Guinea ecosystem). In Kelian river case, our results suggest that invertebrate shredders are indicators of human impact on the river. In downstream sites our results show that the river is more polluted and the relative importance of grazers and shredders decrease. The primary producers disappear downstream as consequence of mine activity and human waste. In the marine system case study, we analyzed the effects of association between tunas and FADs, and compared this to the behavior of free tuna individuals. The results suggest that skipjack tuna is affected by the use of FADs as fishing strategy on them. Some individual species show more sensibility to variation of population size of tuna. These two studies contribute to better understand how functional diversity is related to human impact. This kind of approach may help in shaping systems-based conservation and marine fisheries management strategies. Keywords: food web, aquatic ecosystems, stochastic model, sensitivity analysis

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Gjata, Nerta. "Food Web Simulation Studies on Aquatic Ecosystems." Doctoral thesis, University of Trento, 2013. http://eprints-phd.biblio.unitn.it/1140/1/TesiN_Gjata.pdf.

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There is an increasing interest in dynamical food web modeling, and recent advances of computational biology provide new algorithms and tools for modern systems ecology. In this work stochastic individual-based models are used for simulating food web dynamics in two case studies: the Kelian river, in Borneo, Indonesia and a marine ecosystem in Gulf of Guinea. The two cases present effects from human perturbations. In both cases, we constructed food webs, based on real databases. We parameterized the stochastic dynamical model for the system models and performed sensitivity analysis (and community response indicators) in order to quantify the relative importance of system components. The main aims are to understand the importance of functional diversity of aquatic ecosystems and relations between the dynamics of species and the whole community in perturbed ecosystems due to human activities (pollution due to gold mining activity and human settlements in the case of the Kelian river ecosystem and the impact of Fish Aggregation Devices on skipjack tuna communities in the case of the Gulf of Guinea ecosystem). In Kelian river case, our results suggest that invertebrate shredders are indicators of human impact on the river. In downstream sites our results show that the river is more polluted and the relative importance of grazers and shredders decrease. The primary producers disappear downstream as consequence of mine activity and human waste. In the marine system case study, we analyzed the effects of association between tunas and FADs, and compared this to the behavior of free tuna individuals. The results suggest that skipjack tuna is affected by the use of FADs as fishing strategy on them. Some individual species show more sensibility to variation of population size of tuna. These two studies contribute to better understand how functional diversity is related to human impact. This kind of approach may help in shaping systems-based conservation and marine fisheries management strategies. Keywords: food web, aquatic ecosystems, stochastic model, sensitivity analysis

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Holland, Angela. "BRIDGING AQUATIC AND TERRESTRIAL ECOSYSTEMS: ECOLOGY OF SEMI-AQUATIC MAMMALS IN SOUTHERN ILLINOIS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/dissertations/1269.

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Mammals in freshwater aquatic systems play important roles as ecosystem engineers, trophic transfer agents, and apex predators, thus acting as indicators of freshwater ecosystem function. Watersheds inhabited by semi-aquatic mammals have increased links between adjacent terrestrial and aquatic ecosystems compared to watersheds where they are not present. Semi-aquatic mammals not only exert top-down influences on streams, but are affected by bottom-up forces from the riparian system itself. The goal of this study was to identify variables that correlate with the presence of beaver (Castor canadensis), muskrat (Ondatra zibethicus), mink (Neovison vison), and river otter (Lontra canadensis), including their interactions, resulting in a better understanding of the areas where these semi-aquatic mammals occur and their effects on the riparian system. The objectives of this study were (1) to identify variables related to the probability of detection, initial occupancy, colonization, and extinction of the 4 semi-aquatic mammals in southern Illinois; and (2) to test if the reintroduction of river otter has changed stream food webs. To address my first objective, I sampled 120 bridge sites in 2 periods (winter: Jan-Feb; and spring: Mar-Apr) during 2012–2014 in 11 major watersheds in the southern third of Illinois (44,526 km2) to estimate multi-season occupancy. Each survey unit was a 400-m stream segment visited twice by 2 observers for a total of 4 observations per site per period. Observers recorded all mammal signs found, including sign species and type. Sites were Intensive Basin Survey Sites sampled by Illinois Department of Natural Resources (IDNR) and Illinois Environmental Protection Agency (IEPA), allowing data collected by the state to be available for explanatory variables for mammal occupancy. Data collected by the Illinois Natural History Survey (INHS) also were available for a subset of sites. I collected local- and landscape-scale habitat and weather variables for each site. I developed hypotheses regarding occupancy of sites based on land-cover, human disturbance, and stream attributes for each species. I developed additional hypotheses regarding prey availability and water quality for river otter and mink. Sites used in each analysis were dependent on data available to address the hypotheses of interest. Beaver and muskrat were present at ≥100 of 103 sites for ≥1 observation. Naïve occupancy was high (≥82%) every year for both species. Detection probabilities for beaver and muskrat were best predicted by survey period. Beaver detection remained fairly constant across survey periods except for a decrease in winter 2014, whereas muskrat detection was generally lower during winter and higher during spring. Beaver were more likely to occupy larger streams than smaller streams during the initial survey period. Sites that lacked a dominant land-cover had a lower probability of beaver colonization than sites dominated by agriculture or woody vegetation at the landscape scale. In addition, the probability that a site would be colonized by beaver during the study increased with availability of water within 1 km of the surveyed segment, increased stream density, sites at larger streams, and river otter presence during the previous period. The probability of site extinction decreased as stream size, stream density within 1 km, and water availability within 500 m of the survey segment increased. Occupancy of muskrat during the initial survey period was negatively predicted by % forest in the 1-km riparian area, channel incision, and amount mercury in the sediment. Colonization by muskrats was lower during the long spring to winter intervals than the short winter to spring intervals, and was positively related to the amount of organic carbon in the sediment. The probability of site extinction by muskrat increased with increasing % forest within the riparian area around the stream segment, decreasing 1-km stream density, and when land-cover within 1 km of sites was dominated by agriculture or woody vegetation. Multi-season occupancy of river otter and mink were assessed in 2 separate analyses that used either land-cover and management variables or prey availability and riparian community composition, respectively. In the first analysis, river otter and mink were present at ≥84 of 103 sites. Naïve occupancy was higher every year for mink (≥88.3%) than for river otter (≥55.3%). Detection of river otter and mink in the first analysis increased as substrate availability increased. Occupancy of river otter during the initial survey period was predicted by large stream size, low % developed area within 250 m of the surveyed segment, and proximity to nearest river otter reintroduction point. Probability of colonization by river otter varied by survey period and was higher at sites with larger streams, higher stream density, lower % developed area, and within a known river otter population area. Site extinction by river otter in the first analysis varied by survey period and was linked to increased organic carbon in the sediment, and decreased road density within 1 km of the surveyed segment. River otter harvest was not found to affect site colonization or extinction. Mink occupancy during the initial period was negatively associated with water availability within 100 m of the survey segment. Site colonization by mink varied by month and increased with increasing developed area within 100 m of the surveyed segment, increasing channel incision, and decreasing rainfall. Probability of site extinction for mink increased as stream size and developed area within 500 m of the surveyed segment increased, and when woody vegetation was the dominant land-cover type within 1 km of the surveyed segment. The second analysis of multi-season occupancy of river otter and mink used 77 sites, 81.8% of which had ≥1 river otter detection in the study and 98.7% of which had ≥1 mink detection. Naïve occupancy differed between years but gradually increased for river otter and remained high (≥93.5%) for mink. Increasing substrate availability increased the probability of river otter detection, whereas mink detection varied by survey period. Occupancy during the initial survey period was higher in sites closer to the reintroduction points for river otter. Probability of colonization of river otter was positively associated with macroinvertebrate IBI and fish species richness, sites with high fish species richness of fish families preferred by river otter also had reduced otter extinction probability. No tested variables predicted initial occupancy for mink, but mink were more likely to colonize sites with increased fish richness and when muskrat were present during the previous period. Mink had decreased probability of extinction in sites with increasing mussel community index. My results indicate that semi-aquatic mammals in Illinois were affected by a riparian habitat, water availability, and stream community variables at both the landscape and local scale. I found high occupancy of mink, beaver, and muskrat across the entire landscape of southern Illinois, and my results suggest that the geographic range of river otter continues to expand. Relationships of occupancy of these semi-aquatic mammals to measurements of urban areas and human disturbance were not consistent across all species. Mink and river otter occupancy were both predicted by aspects of prey availability, indicating the importance of predator-prey relationships in occupancy dynamics of riparian predators. Hypotheses regarding predator pressure and changes in environmental variables were used to test the effects of river otter reintroduction on stream communities. For this objective, I used structural equation models. I compared fish and macroinvertebrate communities from before (1982-1995) and after (2005-2013) reintroduction of river otter, which occurred in 1994–1996. Fish and macroinvertebrate community data for 35 sites located throughout 6 major watersheds in southern Illinois (25,550 km2) were obtained from state agencies. Changes in stream communities were evaluated using 4 metrics (species richness, species dominance, skewness in size distribution of prey, and proportion of individuals in the size class preferred by river otter). Neither the inclusion of river otter site use nor change in stream quality, measured by change in % forest, improved models over the simple model which only included fish and macroinvertebrate communities. Overall, I found no evidence that river otter presence or change in forest cover affected stream fish and macroinvertebrate communities.

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James, Joanna. "The impact of invasive crayfish on aquatic ecosystems." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/89031/.

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Crayfish are keystone species and ecosystem engineers that affect the structure and function of aquatic ecosystems. Whilst ecological impacts are caused by crayfish in their native range, non - native crayfish species typically have a greater ef fect on some other aquatic organisms and ecosystem processes (Chapter 2). Crayfish are extremely successful invaders that often cause declines in native cra yfish (Chapter 3). Of the 7 non - native crayfish species in the UK, the signal crayfish ( Pacifastacus leniusculus ) is currently the most widespread (Chapter 3). Field and laboratory data, however, suggest that in parts of the UK signal crayfish are being outcompeted by more recently introduced virile crayfish ( Orconectes cf. virilis ) (Chapter 4). Non - native crayfish also threaten native crayfish through disease, notably crayfish plague ( Aphanomyces astaci ), transmission. Whilst non - native North American crayfish are largely resistant to A. astaci , infection in susceptible native European species is usually lethal. Within this study 23 signal crayfish populations were screened for A. astaci and 13 were infected (Chapter 5). Virile crayf ish from the UK were also infected with A. astaci , and therefore should also be considered as a transmission pathway for this pathogen in the UK (Chapter 6). Whilst the majority of studies on crayfish symbionts are focused on A. astaci , crayfish host a wid e range of micro and macro - parasites. One group of particular interest are branchiobdellidans (Annelida: Clitellata). Two species of these ectosymbionts, Xironogiton victoriensis and Cambarincola aff. okadai , were recently discovered on invasive signal cra yfish in the UK (Chapter 7). Owing to their abilities to survive for extended periods off the host and reproduce rapidly both species have a high invasion potential in the UK (Chapter 8). Laboratory experiments show that signal crayfish infested with X. victoriensis were less aggressive and poorer foragers than uninfested c rayfish , therefore these symbionts may influence signal crayfish invasion dynamics (Chapter 9).

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Kamara, Sheku. "Physiological responses of aquatic macrophytes to natural organic matter potential for structuring aquatic ecosystems." Berlin Logos-Verl, 2008. http://d-nb.info/992155371/04.

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Bruce, Louise Christina. "A study of the interaction between the physical and ecological processes of three aquatic ecosystems /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0178.

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Ding, Yan. "Environmental Dynamics of Dissolved Black Carbon in Aquatic Ecosystems." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/846.

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Black carbon (BC), the incomplete combustion product from biomass and fossil fuel burning, is ubiquitously found in soils, sediments, ice, water and atmosphere. Because of its polyaromatic molecular characteristic, BC is believed to contribute significantly to the global carbon budget as a slow-cycling, refractory carbon pool. However, the mass balance between global BC generation and accumulation does not match, suggesting a removal mechanism of BC to the active carbon pool, most probable in a dissolved form. The presence of BC in waters as part of the dissolved organic matter (DOM) pool was recently confirmed via ultrahigh resolution mass spectrometry, and dissolved black carbon (DBC), a degradation product of charcoal, was found in marine and coastal environments. However, information on the loadings of DBC in freshwater environments and its global riverine flux from terrestrial systems to the oceans remained unclear. The main objectives of this study were to quantify DBC in diverse aquatic ecosystems and to determine its environmental dynamics. Surface water samples were collected from aquatic environments with a spatially significant global distribution, and DBC concentrations were determined by a chemical oxidation method coupled with HPLC detection. While it was clear that biomass burning was the main sources of BC, the translocation mechanism of BC to the dissolved phase was not well understood. Data from the regional studies and the developed global model revealed a strong positive correlation between DBC and dissolved organic carbon (DOC) dynamics, indicating a co-generation and co-translocation between soil OC and BC. In addition, a DOC-assistant DBC translocation mechanism was identified. Taking advantage of the DOC-DBC correlation model, a global riverine DBC flux to oceans on the order of 26.5 Mt C yr-1 (1 Mt = 1012 g) was determined, accounting for 10.6% of the global DOC flux. The results not only indicated that DOC was an important environmental intermediate for BC transfer and storage, but also provided an estimate of a major missing link in the global BC budget. The ever increasing DBC export caused by global warming will change the marine DOM quality and may have important consequences for carbon cycling in marine ecosystem.

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Books on the topic "Aquatic ecosystems"

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Polunin, Nicholas V. C., ed. Aquatic Ecosystems. Cambridge: Cambridge University Press, 2008. http://dx.doi.org/10.1017/cbo9780511751790.

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Gonzales, Gaudiosa A. Aquatic ecosystems. Diliman, Quezon City: University of the Philippines, Open University, 2001.

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1953-, Kumar Arvind, ed. Aquatic ecosystems. New Delhi: A.P.H. Pub. Corp., 2003.

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George, Michael R., ed. Managed aquatic ecosystems. Amsterdam: Elsevier, 1987.

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Pandey, Prem Chandra, Prashant K. Srivastava, and Sanjeev Kumar Srivastava. Aquatic Ecosystems Monitoring. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000.

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Kainz, Martin, Michael T. Brett, and Michael T. Arts, eds. Lipids in Aquatic Ecosystems. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-89366-2.

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Del Giorgio, Paul A., 1961- and Williams Peter J. leB, eds. Respiration in aquatic ecosystems. Oxford: Oxford University Press, 2005.

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1958-, Arts Michael Theodore, Brett Michael T, and Kainz Martin J, eds. Lipids in aquatic ecosystems. Dordrecht: Springer, 2009.

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1926-, Agrawal V. P., Desai B. N. 1934-, Abidi, S. A. H. 1940-, and National Institute of Oceanography (India), eds. Management of aquatic ecosystems. Delhi: Narendra Pub. House, 1989.

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Häder, Donat-P., E. Walter Helbling, and Virginia E. Villafañe, eds. Anthropogenic Pollution of Aquatic Ecosystems. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75602-4.

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Book chapters on the topic "Aquatic ecosystems"

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Melack, John M. "Aquatic Ecosystems." In Ecological Studies, 119–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49902-3_7.

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Kumar, Har Darshan, and Donat-P. Häder. "Aquatic Ecosystems." In Global Aquatic and Atmospheric Environment, 1–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60070-8_1.

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Werkhoven, Marga C. M., and Geert M. T. Peeters. "Aquatic macrophytes." In The Freshwater Ecosystems of Suriname, 99–112. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2070-8_6.

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Capblancq, J. "Special Features of Lake Ecosystems." In Aquatic Ecotoxicology, 21–34. Boca Raton: CRC Press, 2018. http://dx.doi.org/10.1201/9781351069854-3.

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Shilky, Subhashree Patra, Purabi Saikia, and Amit Kumar. "Management of Aquatic Ecosystems and Aquatic Vegetation for Environmental Sustainability." In Aquatic Ecosystems Monitoring, 205–17. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-18.

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Arora, Mohit, Sashikanta Sahoo, Brijendra Pateriya, Isha Swati, and Parag Roy. "Impact of Climate Change and Land Use Land Cover Dynamics on Wetland Ecosystem in Punjab Using Geospatial Technology." In Aquatic Ecosystems Monitoring, 233–51. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-20.

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Alghariani, Mubaraka S., Nezha Mejjad, Ehab M. Sagar, and Heba Bedair. "Monitoring Coastal Chlorophyll-a Concentration in the Coast of North Africa Using Remote Sensing and Machine Learning." In Aquatic Ecosystems Monitoring, 154–65. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-14.

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Petropoulos, George P., Spyridon E. Detsikas, Ioanna Tzanavari, and Efthimios Karymbalis. "Mapping Shoreline Changes in Two River Deltas of Greece Exploiting Geoinformation Technologies." In Aquatic Ecosystems Monitoring, 118–30. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-11.

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Pandey, Prem C., Prashant K. Srivastava, and Sanjeev Kumar Srivastava. "Introduction to Aquatic Ecosystems – Editorial Message." In Aquatic Ecosystems Monitoring, 3–10. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-2.

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Singh, Abha, Prem Raj Uddandam, Abhijit Mazumder, and MC Manoj. "Multiproxy (Calcareous Nannofossil, Benthic Foraminiferal, and Total Organic Carbon) Records from the Eastern Arabian Sea." In Aquatic Ecosystems Monitoring, 32–42. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003354000-6.

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Conference papers on the topic "Aquatic ecosystems"

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C., Giardino, Bresciani M., Fabbretto A., Pellegrino A., Panizza L., Matta E., Braga F., Scarpa G.M., and Brando V. E. "Prisma Products and Applications for Aquatic Ecosystems." In IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium, 2251–54. IEEE, 2024. http://dx.doi.org/10.1109/igarss53475.2024.10641559.

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Alexandrov, V. V., B. V. Alexandrov, Y. M. Balagula, I. N. Serov, and D. A. Ustavnikov. "Electromagnetic Exposures by Cellular Phones on Aquatic Ecosystems Behavior IN-VIVO." In 2004_Wroclaw, 1–6. IEEE, 2004. https://doi.org/10.23919/emc.2004.10844199.

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Feio, Maria João, Georgios Koutalieris, Symeon Symeonidis, Xenofon Karagiannis, Sónia RQ Serra, Ana Raquel Calapez, and Janine P. Silva. "Integrating Multisource Data for The Assessment of Urban Aquatic Ecosystems Health." In IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium, 972–74. IEEE, 2024. http://dx.doi.org/10.1109/igarss53475.2024.10642458.

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Nair, Amritha, Fleur Visser, Ian Maddock, and Jonas Schoelynck. "Mapping stress in submerged aquatic vegetation using multispectral imagery and structure from motion photogrammetry." In Remote Sensing for Agriculture, Ecosystems, and Hydrology XXVI, edited by Christopher M. Neale, Antonino Maltese, Caroline Nichol, and Charles R. Bostater, 43. SPIE, 2024. http://dx.doi.org/10.1117/12.3034015.

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Vasquez-Charcape, Yury, Gustavo Jamanca-Lino, David Sanchez-Perez, and Bruno Cevallos. "FISHER-X: AN ENGINEERING CONCEPT TO MONITOR WATER ENVIRONMENTS USING ROBOTIC BIOMIMICRY." In 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 91–102. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/3.1/s12.12.

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Human activities have significantly impacted aquatic ecosystems worldwide, especially in developing countries. Acid mine drainage from mineral extraction and wastewater containing xenobiotics pose substantial threats for lakes and marine ecosystems, introducing heavy metals and increasing antibiotic resistance in pathogenic microbes. Despite the urgent need for effective solutions, many environmental liabilities remain without an adequate mapping unmapped or remediation plan, exacerbating risks for environmental health. To address these challenges, our team proposes FISHER-X, a biomimetic robot inspired by the hadal snailfish Pseudoliparis swirei. This innovative technological tool is designed to support integrative studies and monitor water bodies near industrial facilities, particularly mining units. FISHER-X's proposed capabilities make it a suitable tool for assessing polluted and hazardous environments. This paper presents the conceptual design of FISHER-X, including fundamental equations for engineering design, motion mechanisms based on computational simulation, and a proposed validation test. Potential applications extend beyond conventional environmental monitoring, such as habitability surveys, life detection, and physicochemical characterization and mapping of aquatic environments on Earth and beyond.

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Gladkikh, Tatiana Ya, Konstantin D. Rusakov, and Aleksey V. Grafenkov. "Oil Pollution Detection in Aquatic Ecosystems Using UAVs and Multispectral Imaging Based on Deep Learning Technologies." In 2024 8th International Conference on Information, Control, and Communication Technologies (ICCT), 1–5. IEEE, 2024. https://doi.org/10.1109/icct62929.2024.10874968.

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Zubcov, Elena, Nadejda Andreev, and Dumitru Bulat. "Determinarea schimbărilor mediului acvatic, evaluarea migrației şi impactului poluanților, stabilirea legităților funcționării hidrobiocenozelor şi prevenirea consecinţelor nefaste asupra ecosistemelor (abordări, oportunități, realizări)." In Simpozion "Modificări funcționale ale ecosistemelor acvatice în contextul impactului antropic și al schimbărilor climatice". Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/9789975151979.01.

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This article reflects on the main issues addressed in the AQUABIO project in the context of international provisions for the prevention of the risk of pollution of aquatic ecosystems and the need to protect/restore aquatic biodiversity. The paper presents the applied innovative tools, project stages, applied research methods and equipment as well as the main results obtained during 2020, including changes taking place in the ecosystems of the Dniester and Prut rivers under the influence of anthropogenic (water capture, dams, exploitation of rivers for energy purposes) and natural factors (meteorological conditions), which put at risk the functioning of aquatic ecosystems and their capacity for self-purification.

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Fedorova, Irina. "NONADDITIVE PARAMETERS OF ARCTIC AQUATIC ECOSYSTEMS." In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019v/1.4/s02.033.

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Zhyvitskaya, E. P., E. K. Vlasenko, V. A. Stelmakh, and A. G. Sysa. "METHODS FOR ASSESSING THE ECOLOGICAL CAPACITY OF NATURAL AND URBANIZED WATER SYSTEMS." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-252-255.

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Anthropogenic pollution ;rnd e^TOph^t^ of aquatic ecosystems аге дЬЬа1 problems. Especi^ly important is the problem of reducing the quality of the already limited supply of fresh water. These problems have led to а wide range of studies in the field of monitoring of water ecosystems, which allows us to assess the ecologicd state of the reservoir. The functioning of aquatic ecosystems is trgely determined by the anthropogenic ;rnd иаШта! input of biogenic elements from the environment, so to determine the environment^ sound norms of anthropogenic input of biogenic elements into the ecosystem of the reservoir, it is necessary to identify the features of the structure of phyto- ;rnd zooptnkton, macrophytes, as well as to determine the concentration of chem^l elements connmed in the water.

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Zhyvitskaya, E. P., E. K. Vlasenko, V. A. Stelmakh, and A. G. Sysa. "METHODS FOR ASSESSING THE ECOLOGICAL CAPACITY OF NATURAL AND URBANIZED WATER SYSTEMS." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-252-255.

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Abstract:

Anthropogenic pollution ;rnd e^TOph^t^ of aquatic ecosystems аге дЬЬа1 problems. Especi^ly important is the problem of reducing the quality of the already limited supply of fresh water. These problems have led to а wide range of studies in the field of monitoring of water ecosystems, which allows us to assess the ecologicd state of the reservoir. The functioning of aquatic ecosystems is trgely determined by the anthropogenic ;rnd иаШта! input of biogenic elements from the environment, so to determine the environment^ sound norms of anthropogenic input of biogenic elements into the ecosystem of the reservoir, it is necessary to identify the features of the structure of phyto- ;rnd zooptnkton, macrophytes, as well as to determine the concentration of chem^l elements connmed in the water.

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Reports on the topic "Aquatic ecosystems"

1

Schell, D. M. [Energy flow in arctic aquatic ecosystems]. Office of Scientific and Technical Information (OSTI), December 1985. http://dx.doi.org/10.2172/10138591.

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Schell, D. M. [Energy flow in arctic aquatic ecosystems]. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6614833.

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Anderson, Elizabeth P., Sandra B. Correa, Michael Goulding, and Thiago B. A. Couto. Conserving Aquatic Ecosystems in the Amazon. Wildlife Conservarion Society, 2022. http://dx.doi.org/10.19121/2022.report.45346.

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Burton, G. A. Assessing aquatic ecosystems using pore waters and sediment chemistry. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/306942.

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Musselman, Robert C., Laura Hudnell, Mark W. Williams, and Richard A. Sommerfeld. Water chemistry of Rocky Mountain Front Range aquatic ecosystems. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1996. http://dx.doi.org/10.2737/rm-rp-325.

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Mooney, Benjamin. Understanding the Efficiency of Energy Flow Through Aquatic Food Webs. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2024. http://dx.doi.org/10.54612/a.2kg9dkp0ch.

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The efficiency of energy flow through aquatic food webs is crucial for ecosystem functioning. The energy available to higher trophic levels varies across ecosystems and is influenced by factors such as nutrient availability and species composition. Recent research indicates that temperature also plays a significant role in determining energy transfer efficiency. This essay addresses the factors contributing to variability in energy flow efficiency between aquatic ecosystems, with a focus on the impacts of global climate change. It explores how food web characteristics influence energy transfer between trophic levels and examines the challenges in understanding and estimating energy flow due to complex trophic relationships, spatial subsidies, and processes across multiple biological levels. The essay highlights the dynamic response of energy flow efficiency to climate changerelated environmental changes, such as rising temperatures, altered precipitation patterns, and nutrient inputs. Additionally, it identifies gaps in our current understanding and suggests important avenues for further research to improve predictions of energy flow changes, essential for informing sustainable management strategies in the face of environmental change.

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Russ, Emily, Amy Yarnall, and Safra Altman. Dredged material can benefit submerged aquatic vegetation (SAV) habitats. Engineer Research and Development Center (U.S.), August 2023. http://dx.doi.org/10.21079/11681/47423.

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This technical note (TN) was developed by the US Army Engineer Research and Development Center–Environmental Laboratory (ERDC-EL) to provide an overview of the ecosystem services delivered by submerged aquatic vegetation (SAV) to estuarine and coastal ecosystems and to describe potential methods for the beneficial use of dredged material (BUDM) to aid in SAV restoration. Although dredging tends to have a negative association with SAV habitats, BUDM may provide an opportunity to expand suitable SAV habitat to areas where depth is the primary limiting factor. Recent in situ observations have shown that SAV has opportunistically colonized several dredged-material placement sites. This TN provides context on BUDM for SAV habitat restoration to encourage increased strategic placement.

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Schad, Aaron, Daniel Allen, Lynde Dodd, Ricardo Luna, Jacob Kelly, Kristina Hellinghausen, Nathan Harms, Gary Dick, and Yaretzy Charo. Aquatic ecosystem restoration in the Texas Western Gulf Coast Plain / Lower Rio Grande alluvial floodplain ecoregion : Resaca Boulevard Resaca Section 206—vegetation community adaptive management. Engineer Research and Development Center (U.S.), September 2023. http://dx.doi.org/10.21079/11681/47559.

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As part of the US Army Corps of Engineers (USACE) Continuing Authorities Program (CAP), Section 206 projects focus on restoring aquatic habitats for the benefit of fish and other wildlife. From 2017–2021, USACE Engineer Research and Development Center–Environmental Laboratory researchers in the Aquatic Ecology and Invasive Species Branch (ERDC-EL EEA) at the Lewisville Aquatic Ecosystem Research Facility (LAERF) collaborated with USACE Galveston District, The Nature Conservancy, US Fish and Wildlife Service, National Park Service, and local nonfederal sponsors—Brownsville (Texas) Public Utility Board and the City of Brownsville—to study restoration methods on former, naturally cut-off, channels of the Lower Rio Grande River. These aquatic ecosystems, locally termed “resacas,” are home to endemic plants and animals and are thus an important natural resource of national interest. This technical report documents the planning, design, construction, monitoring, and adaptive management activities throughout the Resaca Boulevard Resaca Section 206 Aquatic Ecosystem Restoration project. Methods and results for invasive species management—primarily Brazilian peppertree (Schinus terebinthfolia)—and aquatic and riparian vegetation establishment in endemic Texas ebony resaca forest, subtropical Texas palmetto woodland, and Texas ebony/snake-eyes shrubland habitats are discussed.

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Dick, Gary O., R. M. Smart, and Lynde L. Dodd. Propagation and Establishment of Native Plants for Vegetative Restoration of Aquatic Ecosystems. Fort Belvoir, VA: Defense Technical Information Center, June 2013. http://dx.doi.org/10.21236/ada582960.

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Gosink, Luke, Vanessa Bailey, Jerry Tagestad, and Katherine EO Todd-Brown. Monitoring of Terrestrial Aquatic Ecosystems Through Analysis of Time-Variant Hyperspectral Imagery. Office of Scientific and Technical Information (OSTI), December 2020. http://dx.doi.org/10.2172/1989211.

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