Lakes Research Papers - Academia.edu (original) (raw)

Microbial methanogenesis at extreme conditions of saline alkaline soda lakes has, so far, been poorly investigated. Despite the obvious domination of sulfidogenesis as the therminal anaerobic process in hypersaline soda lakes of Kulunda... more

Microbial methanogenesis at extreme conditions of saline alkaline soda lakes has, so far, been poorly investigated. Despite the obvious domination of sulfidogenesis as the therminal anaerobic process in hypersaline soda lakes of Kulunda Steppe (Altai, south-western Siberia), high concentrations of methane were detected in the anaerobic sediments. Potential activity measurements with different substrates gave results significantly deviating from what is commonly found in hypersaline habitats with neutral pH. In particular, not only a non-competitive methylotrophic pathway was active, but also lithotrophic and, in some cases, even acetate-dependent methanogenesis was found to be present in hypersaline soda lake sediments. All three pathways were functioning exclusively within the alkaline pH range between 8 and 10.5, while the salt concentration was the key factor influencing the activity. Methylotrophic and, in less extent, lithotrophic methanogenesis, was active up to soda-saturatin...

Complementary analysis of satellite mission data (altimetry, Moderate Resolution Imaging Spectroradiometers (MODIS)) and climate fields over 2000–2009 was conducted to investigate the variability of the water cover surfaces and the... more

Complementary analysis of satellite mission data (altimetry, Moderate Resolution Imaging Spectroradiometers (MODIS)) and climate fields over 2000–2009 was conducted to investigate the variability of the water cover surfaces and the geographical source of water inflowing into the Lake Poopó system. The results suggest that over the time span of 2000–2009 a great part of the variability of the Poopó system originates from geographic sources other than Lake Titicaca. Possible alternative causes include climate change inducing increased temperatures and greater evaporation rates along the Altiplano; increased glacier and snow melting over the Andes Cordillera; and a potential increased anthropogenic water use (such as irrigation, minery, etc.) throughout the path of the Desaguadero River (which connects lakes Titicaca and Poopó). This change in the hydrology of this region could lead to a collapse of water supplies and endanger the already fragile Poopó system as well as the regional socioeconomic system, which closely depends upon it.

One of the most evident consequences of eutrophication of waters is the progressive spreading of persistent cyanobacterial blooms. They are often accompanied by the production of cyanotoxins in concentrations, which are hazardous for... more

One of the most evident consequences of eutrophication of waters is the progressive spreading of persistent cyanobacterial blooms. They are often accompanied by the production of cyanotoxins in concentrations, which are hazardous for human health. In this research, we analysed phytoplankton communities in four lowland water bodies, for the presence of cyanobacterial blooms and toxin production. The cyanobacterial biovolumes we found, determine three of the lowland water bodies: Onogur Reservoir (OR), Asparuhov Val Reservoir (AVR), and Srebarna Lake (SL) as "Alert Level 1" of potentially hazardous levels of cyanotoxins. Cyanobacterial biovolume exceeds the threshold value of 8 mm 3 L-1 (recreational waters) in AVR and SL at the end of the summer period. In OR, we registered sustainable bloom of Microcystis spp. during the whole summer season, and extremely high average seasonal value of the total biovolume (146.5 mm 3 L-1). Microcystins were reported in all four analysed water bodies, with the highest concentration in OR (6 µg L-1). Cylindrospermopsin was detected in AVR and OR, while saxitoxins were in AVR and SL. The concentrations of cyanotoxins do not exceed the guideline values in recreational waters. However, the increased biovolumes of cyanobacteria are a signal that in three of the analysed water bodies, monitoring is recommended at the levels of cyanotoxins during the summer period.

Total, 94 specimens of gudgeon (Gobio ohridanus Karaman, 1924) from the Macedonian part of the Lake Ohrid were examined and 61 fishes (64.89%) were infected with parasites. The presence of 4 parasite species was established: Dactylogyrus... more

Total, 94 specimens of gudgeon (Gobio ohridanus Karaman, 1924) from the Macedonian part of the Lake Ohrid were examined and 61 fishes (64.89%) were infected with parasites. The presence of 4 parasite species was established: Dactylogyrus cryptomeres f. typica (Monogenea), Cystidicoloides tenuissima and Philometra ovata (Nematoda), and Pomphorhynchus laevis (Acanthocephala). The highest prevalence and intensity of infection was with Dactylogyrus cryptomeres f. typica (59.57%; mean intensity 6.07). The lowest one was with Cystidicoloides tenuissima and Philometra ovata (2.13%; 1.0). Dactylogyrus cryptomeres f. typica is recorded for the first time in the ichthyoparasitofauna of Lake Ohrid and Macedonia. KEY WORDS: parasite fauna, gudgeon, Lake Ohrid, Macedonia.

Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and... more

Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and sub-fossil cladoceran assemblages and no investigations are available from Mediterranean lakes where salinity, eutrophication and top-down control of large-bodied cladocerans are known to be important. Here we compared contemporary Cladocera assemblages, sampled in summer, from both littoral and pelagic zones, with their sub-fossil remains from surface sediment samples from 40 Turkish, mainly shallow, lakes. A total of 20 and 27 taxa were recorded in the contemporary and surface sediment samples, respectively. Procrustes rotation was applied to both the principal components analysis (PCA) and redundancy analysis (RDA) ordinations in order to explore the relationship between the cladoceran community and the environmental variables. Procrustes rotation analysis based on PCA showed a significant accord between both littoral and combined pelagic–littoral contemporary and sedimentary assemblages. RDA ordinations indicated that a similar proportion of variance was explained by environmental variation for the contemporary and fossil Cladocera data.

The literature on fisheries co-management is almost silent on the issue of the movement of fisherfolk within fisheries, although such movement must have implications for the effectiveness of co-management. The introduction of... more

The literature on fisheries co-management is almost silent on the issue of the movement of fisherfolk within fisheries, although such movement must have implications for the effectiveness of co-management. The introduction of co-management often involves the formation of new structures that should enable the participation of key stakeholder groups in decision-making and management, but such participation is challenging for migrating fishers. The article reports on a study on Lake Victoria, East Africa, which investigated the extent of movement around the lake and the implications of movement for how fishers participate and are represented in co-management, and the implications of the extent and nature of movement for co-management structures and processes. The analysis draws on the concept of space from the literature on participation in development and on a framework of representation in fisheries co-management in addressing these questions. The created space is on an 'invited&...

Aquatic plants need two essential nutrients for growth: Phosphorus and Nitrogen. They receive these nutrients through a process known as eutrophication, in which water bodies accumulate plant nutrients, typically from nutrient-rich land... more

Aquatic plants need two essential nutrients for growth: Phosphorus and Nitrogen. They receive these nutrients through a process known as eutrophication, in which water bodies accumulate plant nutrients, typically from nutrient-rich land drainage (Smith 2003). In a healthy lake, both nutrients occur in limiting amounts, restricting plant growth. However, anthropogenic (or human) factors can dramatically increase the concentration of plant nutrients in water bodies, a phenomenon known as “cultural eutrophication”(Hasler 1947). Human-induced pollution through the impacts of excessive fertilizer use, untreated wastewater effluents and detergents significantly increases nutrient loading into lakes, accelerating eutrophication beyond natural levels and generating deleterious changes to the natural ecosystem (Litke 1999). Over the past 50 years, a large body of literature has been developed to identify the principle impacts and sources of increased nutrient levels on the quality of receiving waters (Smith 2003). It is now generally accepted that cultural eutrophication can stimulate the rapid growth of plants and algae, clogging waterways and potentially creating toxic algae blooms. Hypoxic (very low oxygen) conditions may result when these plants and algae die and decompose stripping water of dissolved oxygen, leading to fish kills and degrading the aesthetic and recreational value of the lake (ESA 2008). Cultural eutrophication is an increasingly global problem as the deterioration of water quality and excessive biological productivity in lakes inflicts significant environmental and societal damage.

Siais Lake is the second largest Lake in North Sumatra Province. However, basic and essential information about this lake does not yet exist. Therefore, this study aims to describe the necessary information regarding bathymetry and... more

Siais Lake is the second largest Lake in North Sumatra Province. However, basic and essential information about this lake does not yet exist. Therefore, this study aims to describe the necessary information regarding bathymetry and morphometry of the Siais Lake. Data was collected in June (dry season) and December (rainy season) 2019. Map analysis used the Quantum GIS 1.8 program. Siais Lake is a shallow lake with a maximum depth of 11.8 m and an average depth of 5.81 m. The total area of Siais Lake reaches 17 km 2 , with a total volume of 46-64 million m 3. Some 7 km 2 (41%) of the lake's surface are covered by aquatic macrophyte species, dominated by lily plants (Amaryllidaceae). Lake Siais is very suitable for the littoral zone development and rooted aquatic plants cultivation.

The areas of study selected in the present investigation are Shirvane and Nerul lakes situated at Nerul which is considered as the queen of Navi Mumbai, the city on the west coast of the Indian state of Maharashtra. The lake areas receive... more

The areas of study selected in the present investigation are Shirvane and Nerul lakes situated at Nerul which is considered as the queen of Navi Mumbai, the city on the west coast of the Indian state of Maharashtra. The lake areas receive domestic raw sewage from surrounding habitation; so also the activities like cattle and cloth washing, bathing, religious activities like idol immersion etc. paves the way of harmful chemicals in the lake water. The study was performed to understand physico-chemical parameters and the concentration of heavy metals in lake water. It was found that the concentration of the heavy metals in the lake water substantially increased after the religious activities like idol immersion around September–October. These heavy metals have a marked effect on the aquatic flora and fauna which through bio-magnification enter the food chain and ultimately affect the human beings as well.

The provision of diverse ecosystem goods and services by lakes is vital to ecosystem health and economic well-being of nations or regions. Securing ecologically safe lake water quality and quantity through sustainable uses and management... more

The provision of diverse ecosystem goods and services by lakes is vital to ecosystem health and economic well-being of nations or regions. Securing ecologically safe lake water quality and quantity through sustainable uses and management practices concerns both present and future generations. The present study quantifies long-term impacts of human-induced disturbances including climate change on water surface areas of the 18 largest Turkish lakes. Spatiotemporal change detection analysis was carried out using long-term Landsat time series data between 1973 and 2014 with the aid of geographical information systems (GIS). Supervised and unsupervised classification techniques were combined to temporally differentiate and spatially delineate lake water surface areas using ancillary data. Over the period of about 40 years, lake surface area decreased for 15 lakes at a mean annual rate of 0.96 km2 but increased for three lakes at a mean annual rate of 0.17 km2. These spatiotemporal changes may be attributed to such human-induced pressures as drought, sectoral water uses/withdrawals, draining, and landfilling. These changes in turn lead to losses of or damages to both marketable and non-marketable ecosystem benefits that the lakes provide with humans at the local to-regional spatial scales in the long-to-short-term temporal scales. The integration of remote sensing and GIS techniques adopted in this study allows for dynamic monitoring of not only lake water quality and quantity but also other natural resources, thus facilitating a timely and effective development of preventive and mitigative measures.

Fish are frequently contaminated with mercury, raising concerns about the human health consequences of eating fish. We quantified mercury exposure and awareness of health advisories among three major ethnic groups of anglers in Madison,... more

Fish are frequently contaminated with mercury, raising concerns about the human health consequences of eating fish. We quantified mercury exposure and awareness of health advisories among three major ethnic groups of anglers in Madison, Wisconsin, using surveys of species preferences and consumption rates. African American anglers reported eating double and triple the amount of fish consumed by Hmong Americans and Whites, respectively. However, Hmong Americans preferred species with higher levels of contamination, resulting in net mercury exposure comparable to that of African Americans. Few anglers exceeded personal exposure recommendations, but the majority shared fish with family or friends. Children are particularly sensitive to the neurotoxic effects of heavy metals, and one-third of anglers reported providing fish to children. African Americans reported
the least knowledge about advisories, but misconceptions about mercury existed in each ethnic group. Our findings highlight the need to tailor advisories for specific groups of anglers based on consumption rates, preferred species, and favored communication channels. Improved messaging is particularly important for guiding informed fish consumption by families.

This research work evaluates the impact of stormwater infiltration on the removal of organics, solids, nitrogen and phosphorus in a LECA-based horizontal subsurface flow constructed wetland. Stormwater runoff for the period between... more

This research work evaluates the impact of stormwater infiltration on the removal of organics, solids, nitrogen and phosphorus in a LECA-based horizontal subsurface flow constructed wetland. Stormwater runoff for the period between January 2008 and June 2010 (30 months) was estimated for the drainage basin of the Vila Fernando wastewater treatment plant (constructed wetland system) and it was observed proportionality between the increase in surface runoff and the infiltration flow rate that reached the plant. The average stormwater infiltration rate that reached the plant was 67.4 m(3) d(-1) (77% of the influent flow rate into the plant). The 30 month monitoring campaign set up at one of the reed beds showed that stormwater infiltration led to a high variation of the hydraulic loading rate (HLR) throughout the bed, which affected its performance in the removal of organic matter, suspended solids and nitrogen. For a HLR below 20 cm d-1 the removal efficiencies for BOD5, COD and TSS doubled. The removal of nitrogen was too low and was associated with the weak development of nitrifying biofilm and the poor growth of reeds. However, it was observed a good relationship between the applied and removed loads for most of the parameters, which seems to indicate that the organic, solid, nitrogen and phosphorus loading rates influenced the respective removal rates. The use of a bed material with high specific surface area, such as LECA, can only improve the treatment capacity of horizontal subsurface flow systems if the organic and solid loading rates, as well as the HLR, can be effectively controlled.

Aquatic ecosystems are particularly vulnerable to environmental change and many are currently under pressure from direct human impacts such as hydraulic modifications, channelization, water abstraction, eutrophication and climate change.... more

Aquatic ecosystems are particularly vulnerable to environmental change and many are currently under pressure from direct human impacts such as hydraulic modifications, channelization, water abstraction, eutrophication and climate change. A recent national assessment revealed that almost a quarter of lakes and reservoirs across the lower 48 states are in poor biological condition. This study also shows that poor habitat conditions along the lakeshore and high levels of plant nutrients (nitrogen and phosphorus) are the most significant stressors of lakes and reservoirs in the US. About 20% of all lakes/reservoirs evaluated in the study contain high levels of nutrients, mostly resulting from anthropogenic pressure. This human-induced eutrophication affects the water quality and the ecosystem structure and function of these freshwater habitats. It can also have a significant economic impact due to losses in recreational water usage, waterfront real estate, spending on recovery of threatened and endangered species, and drinking water. Recent estimates have suggested that the economic losses due to eutrophication of US freshwaters are over $2 billion annually. Therefore, assessing the physical and anthropogenic controls on the water quality of lakes/reservoir is a critical challenge for both environmental scientists and water resource managers. Here we present the preliminary results of an ongoing study to determine the trophic state of nine lakes and reservoirs in north-central Ohio, as well as the physical and anthropogenic factors controlling the spatial and seasonal changes on the nutrient dynamic in these systems. We evaluate the influence of land and water use, geology, vegetation, snowmelt, precipitation and atmospheric deposition on the water quality in these lakes, and what are the sources and sinks of nutrients and the magnitude of these material fluxes. The surface area of the studied lakes/reservoirs varies from 28 to 1350 acres. They are nested in mixed-use catchments, with some being surrounded by parks, state forests, and wilderness areas, and others by cropland and developed landscapes. Since this is the first time these ecosystems are being assessed, we also evaluated the geochemistry of major ions (Mg2+, Ca2+, Na+, K+, Cl-, SO42-) and trace elements concentration on all nine lakes/reservoirs.

Elevation measurements from the Ice, Cloud and Land Elevation Satellite (ICESat) have been applied to monitor dynamics of lakes and other surface water bodies. Despite such potential, the true utility of ICEsat-more generally, satellite... more

Elevation measurements from the Ice, Cloud and Land Elevation Satellite (ICESat) have been applied to monitor dynamics of lakes and other surface water bodies. Despite such potential, the true utility of ICEsat-more generally, satellite laser altimetry-for continuously tracking surface water dynamics over time has not been adequately assessed, especially in the continental or global contexts. This study analyzed elevation derived from ICESat data for the conterminous United States and examined the potential and limitations of satellite laser altimetry in monitoring the water level dynamics. Owing to a lack of spatially-explicit ground-based water-level data, the high-fidelity land elevation data acquired by airborne lidar were firstly resorted to quantify ICESat's ranging accuracy. Trend and frequency analyses were then performed to evaluate how reliably ICESat could capture water-level dynamics over a range of temporal scales, as compared to in-situ gauge measurements. The analytical results showed that ICESat had a vertical ranging error of 0.16 m at the footprint level-an lower limit on the detectable range of water-level dynamics. The sparsity of data over time was identified as a major factor limiting the use of ICESat for water dynamics studies. Of all the US lakes, only 361 had reliable ICESat measurements for more than two flight passes. Even for those lakes with sufficient temporal coverage, ICESat failed to capture the true interannual water-level dynamics in 32% of the cases. Our frequency analysis suggested that even with a repeat cycle of two months, ICESat could capture only 60% of the variations in water-level dynamics for at most 34% of the US lakes. To capture 60% of the water-level variation for most of the US lakes, a weekly repeated cycle (e.g., less than 5 d) is needed-a requirement difficult to meet in current designs of spaceborne laser altimetry. Overall, the results highlight that current or near-future satellite laser missions, though with high ranging accuracies, are unlikely to fulfill the general needs in remotely monitoring water surface dynamics for lakes or reservoirs.

Peatlands constitute central habitats for the occurrence of wetland archaeological sites. Consisting of waterlogged organic soils, they also provide advantageous conditions for the preservation of organic materials. The economic... more

Peatlands constitute central habitats for the occurrence of wetland archaeological sites. Consisting of waterlogged organic soils, they also provide advantageous conditions for the preservation of organic materials. The economic utilisation of peatlands has been extensive and long-lasting in mire-rich Finland. Archaeologists urgently seek to develop viable techniques for detecting, monitoring, and studying peatland archaeological sites, before they are deteriorated. One option is to conduct fieldwalking at commercial peat extraction sites, which was opportunistically tested in the detection of Mesolithic sites at southern Lake Saimaa by the University of Helsinki in 2015. In this paper, the main observations and challenges of the survey are reviewed and suggestions for further testing are presented.

Albano, Bolsena and Bracciano are the most important lakes in Central Italy; the relevance and the potential vulnerability of these lakes is enhanced by their location in a populous area, with a high water demand for agriculture and... more

Albano, Bolsena and Bracciano are the most important lakes in Central Italy; the relevance and the potential vulnerability of these lakes is enhanced by their location in a populous area, with a high water demand for agriculture and other public uses. The waters of Lake Bracciano are already utilized for drinking supply to the city of Rome.
The aim of this paper is to update the information on the water chemistry of these lakes, on the basis of samplings carried out by the authors; moreover experimental data are compared with similar analyses available from the literature.
Besides the mass hydraulic balance of the lake system, the whole volcanic basin was considered and data related to the period 2000-2005 were also highlighted.

In this study remote sensing was used as an early alert tool for chlorophyll-a changes in a continental aquatic ecosystem in central Chile. To this end, 14 LANDSAT images of Laja Lake (36 • 54 'S, 71 • 05' W, 1,360 meters above sea level)... more

In this study remote sensing was used as an early alert tool for chlorophyll-a changes in a continental aquatic ecosystem in central Chile. To this end, 14 LANDSAT images of Laja Lake (36 • 54 'S, 71 • 05' W, 1,360 meters above sea level) were taken over a 6-year period. Eleven spectral indexes were calculated. At the same time, chlorophyll-a concentrations were determined experimentally. Correlations between vegetation indices and chlorophyll-a concentrations in different monitoring zones were established. The indices that presented a good correlation were NDVI and GNDVI. A new regression model was developed that allows the primary productivity values of Laja Lake to be estimated using satellite data. Finally, chlorophyll-a maps were created.

Dissolved oxygen (DO) is probably the most important parameter related to water quality and biological habitat in aquatic environments. In situ DO sensors are some of the most valuable tools used by scientists and engineers for the... more

Dissolved oxygen (DO) is probably the most important parameter related to water quality and biological habitat in aquatic environments. In situ DO sensors are some of the most valuable tools used by scientists and engineers for the evaluation of water quality in aquatic ecosystems. Presently, we cannot accurately measure DO concentrations under variable temperature and pressure conditions. Pressure and temperature influence polarographic and optical type DO sensors compared to the standard Winkler titration method. This study combines laboratory and field experiments to compare and quantify the accuracy and performance of commercially available macro and micro Clark-type oxygen sensors as well as optical sensing technology to the Winkler method under changing pressure and temperature conditions. Field measurements at various lake depths revealed sensor response time up to 11 min due to changes in water temperature, pressure, and DO concentration. Investigators should account for transient response in DO sensors before measurements are collected at a given location. We have developed an effective model to predict the transient response time for Clark-type oxygen sensors. The proposed procedure increases the accuracy of DO data collected in situ for profiling applications.

The Philippines has a plenitude of small lakes scattered all over the archipelago. Many of them are ecologically threatened due mainly to inconsiderate utilisations, unsound development, and arbitrary governance. Against this backdrop,... more

The Philippines has a plenitude of small lakes scattered all over the archipelago. Many of them are ecologically threatened due mainly to inconsiderate utilisations, unsound development, and arbitrary governance. Against this backdrop, lakes studies in the Philippines have been growing over the years. However, the scholarly works are heavily skewed towards studies on major lakes and their abiotic-biotic aspects. This literature imbalance suggests little attention has been paid to small lakes and their governance-development aspects. Ameliorating this literary deficit, the article explores the specifics of the governance and development of Tikub Lake, a little known small lake in Quezon Province. In particular, the study looks into its status, governance practice, and the tourism-oriented development using the Integrated Lake Basin Management (ILBM) criteria as well as the identified key elements for managing, conserving, and developing small lakes in the Philippines. The study elucidates the following on Tikub Lake. In institutions, a key factor is a committed local government which has consistently introduced incremental improvements on the small lake. In policies, the immediate issue is the formulation of a Master Development Plan that would guide the establishment of tourism in the small lake. In involvement, the small lake is blessed with actively participating constituents and an existing people’s organisation which serves as a platform for local participation. In interventions, scientific/technological information and actions (such as water quality assessment and fish stocks conservation) have been utilised for the maintenance of the small lake. In finance, the sourcing of funds continues to be a challenge in sustaining the conservation efforts and organising tourism in the small lake. On the whole, the study delineates the distinct praxis of local governance in Tikub Lake, identifies its critical areas for improvements, offers broad guides in managing and developing inland water bodies, extends the scholarship in lake governance and small lakes, and registers Tikub Lake on the docket of scholarly literature.

Purpose of the study: The main objective of the present work is to assess the efficacy of the restoration endeavour in Bengaluru lakes, Karnataka, India. Rapid urbanisation coupled with industrialisation in urban areas has greatly... more

Purpose of the study: The main objective of the present work is to assess the efficacy of the restoration endeavour in Bengaluru lakes, Karnataka, India. Rapid urbanisation coupled with industrialisation in urban areas has greatly stressed the available water resources qualitatively and quantitatively. This has also resulted in the generation of enormous sewage and wastewater after independence. Method: Environmental monitoring of 40 restored lakes was carried out to identify the key issues and assessed water quality (physical, chemical and biological). Weighted arithmetic water quality index (WQI) and Pearson's correlation coefficient (r) was determined using data of physicochemical parameters of lakes. Principal Component Analysis (PCA) performed using PAST3 software to identify the factors responsible for variations in water quality. Main Findings: The monitored forty lakes distributed across the three major watersheds namely Koramangala and Challaghatta valley, Vrishabhavath...

از آنجا ایران به لحاظ جاذبه های گردشگری، در میان 11 برتر کشور جهان قرار دارد بدین ترتیب دستیابی به موفقیت در این زمینه نیازمند برنامه ریزی هدفمند و مطالعه شده در این راستا می باشد زیرا بقدری صنعت گردشگری با اهمیت می باشد که از آن بعنوان... more

از آنجا ایران به لحاظ جاذبه های گردشگری، در میان 11 برتر کشور جهان قرار دارد بدین ترتیب دستیابی به موفقیت در این
زمینه نیازمند برنامه ریزی هدفمند و مطالعه شده در این راستا می باشد زیرا بقدری صنعت گردشگری با اهمیت می باشد که از آن
بعنوان صادرات نامرئی نام می برندگردشگری روستایی به عنوان یک راهبرد می تواند با برنامه ریزی اصولی مزیت ها و محدودیت
های گردشگری روستایی، نقش موثری در توسعه روستاها داشته باشد. در واقع دغدغه توسعه روستا را می توان از طریق شناسایی
روستاهای نمونه گردشگری و توسعه گردشگری تسهیل نمود. روش این پژوهش توصیفی تحلیلی و پیمایشی است. داده ها از طریق
مطالعه اسنادی و بررسی میدانی گردآوری شده است و با استفاده از مدل سوات به تبیین نقاط ضعف، قوت، فرصت ها و تهدیدها و
ارائه استراتژی و راهبرد در روستاهای حاشیه دریاچه زریوار مریوان پرداخته شده است. در این مقاله سعی شده است که از یک
سو توانمندی ها و تنگناها و از سوی دیگر مطالعات امکان سنجی گردشگری روستاهای مورد مطالعه مورد ارزیابی قرار گیرد. نتایج
حاصل از این تحقیق حاکی از وجود جاذبه های فراوان در این روستاها به ویژه همجواری با دریاچه زریوار و توان بالای این
جاذبه برای جذب گردشگران است.اما متاسفانه به دلیل آسیب پذیر بودن طبیعت نیازمند تعیین و توسعه راهکارهای مشخص
مدیریت توانمند در راستای ارتقا موقعیت گردشگری در سطح روستا ها ی اطراف دریاچه زریوار می باشد.

According to the Intergovernmental Panel on Climate Change report released in September 2014, unprecedented changes in temperature and precipitation patterns have been recorded globally in recent decades and further change is predicted to... more

According to the Intergovernmental Panel on Climate Change report released in September 2014, unprecedented changes in temperature and precipitation patterns have been recorded globally in recent decades and further change is predicted to occur in the near future, mainly as the result of human activity. In particular, projections show that the Mediterranean climate zone will be markedly affected with significant implications for lake water levels and salinity. This may be exacerbated by increased demands for irrigation water. Based on long-term data from seven lakes and reservoirs covering a geographical gradient of 52° of latitudes and a literature review, we discuss how changes in water level and salinity related to climate change and water abstraction affect the ecosystem structure, function, biodiversity and ecological state of lakes and reservoirs. We discuss mitigation measures to counteract the negative effects on ecological status that are likely to result from changes in climate and water abstraction practices. Finally, we highlight research required to improve knowledge of the impacts of anthropogenically induced changes on lake water level and consequent changes in salinity.

Ogni lago, almeno in Europa, può essere considerato come sistema socio-ecologico, caratterizzato dall’interazione di processi ecologici e processi socio-economici, la cui dinamica futura dipende dalle strategie di gestione dell’intero... more

Ogni lago, almeno in Europa, può essere considerato come sistema socio-ecologico, caratterizzato dall’interazione di processi ecologici e processi socio-economici, la cui dinamica futura dipende dalle strategie di gestione dell’intero bacino afferente. Le componenti ecologiche, dell’ecosistema lago in senso stretto e degli altri ecosistemi collegati, e le componenti sociali, includenti le comunità e le attività economiche legate al lago, sono profondamente interdipendenti.
Molte politiche e comunità locali hanno degradato la risorsa naturale che volevano proteggere, altrove, invece i beneficiari di tali risorse si sono auto-organizzati e hanno investito tempo ed energie per raggiungere uno sfruttamento sostenibile. Perché alcuni sistemi socio-ecologici collassano mentre altri appaiono sostenibili? La risposta sta nell’identificare i servizi ecosistemici di cui le comunità locali possono beneficiare e le relazioni causa-effetto anche meno evidenti tra attività economiche e funzionalità degli ecosistemi. Comprendere questa complessità richiede una conoscenza delle specifiche variabili in un’ottica dinamica, sistemica e transdisciplinare. Dobbiamo imparare ad esplorare la complessità anziché evitarla, gli strumenti ci sono.

Grounded on the lacuna in literature— the scarcity of scholarly works on lake gover-nance and small lakes in the country, and the notable transformation of Tadlac Lake— from a threatened and poorly regulated lake to a potential model for... more

Grounded on the lacuna in literature— the scarcity of scholarly works on lake gover-nance and small lakes in the country, and the notable transformation of Tadlac Lake— from a threatened and poorly regulated lake to a potential model for governance and ecotourism development , this article documents the small lake and examines its governance specifics, challenges and implications. It argues that the governance of Tadlac Lake can be characterised as intricate, watershed-based, hierarchical, participatory and centralised. It also contends that the lake's de-velopment— its transformation from an aquaculture-based lake into an ecotourism-oriented lake — illustrates a key lesson for developing small lakes in the country. To close, the article hopes to instigate more governance studies on lakes, particularly small lakes, due to their number (in the country and globally) and the fact that in the country, many are surrounded by impoverished communities.