Lakes and Reservoirs: Research and Management最新文献

{"title":"The invasion of tilapia in South China freshwater systems: A review","authors":"Edwine Yongo,&nbsp;Pengfei Zhang,&nbsp;Eunice Mutethya,&nbsp;Tian Zhao,&nbsp;Zhiqiang Guo","doi":"10.1111/lre.12429","DOIUrl":"https://doi.org/10.1111/lre.12429","url":null,"abstract":"<p>Tilapia invasion has become a significant concern to ecologists and conservationists, posing severe threat to freshwater biodiversity. Many tilapia species have been introduced to China since 1957, with some having invaded freshwater ecosystems in South China. Accordingly, the present review examined the driving factors for successful tilapia invasion and their ecological impacts, information essential for practical management purposes. This review identified aquaculture as the main pathway spreading tilapias into the wild freshwater systems through their escape and release. Their biological and life history traits, including flexible habitat requirements, environmental tolerance, and generalist feeding are essential factors facilitating their ability to inhabit varying habitats. Biodiversity loss and habitat degradation further promote tilapia invasions by creating exploitable habitats for them, noting their considerable tolerance to degraded ecosystems. Regarding ecological effects, tilapias stimulate phytoplankton growth by increasing nutrient concentrations in the water column through excretion and bioturbation. Tilapias also depress benthic algal growth by promoting sediment resuspension, deteriorating water quality, and enhancing eutrophication. Moreover, tilapias cause the decline of native fish species biomass through competition and may threaten fish biodiversity. The findings in the present review suggest direct removal of tilapias can be a useful practice for controlling them. Furthermore, imposing regulations on tilapias introductions, efficient aquaculture management, and biodiversity conservation should also be considered in controlling and preventing the invasion and spread of tilapias.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50129820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of heavy metal and organic pollution of a salmonid ecosystem: Case of the Oued Guigou River, Middle Atlas (Morocco)","authors":"Saida Zerkani,&nbsp;El Hassan Abba,&nbsp;Touria Hachi,&nbsp;Nasser-Eddine Zine","doi":"10.1111/lre.12430","DOIUrl":"https://doi.org/10.1111/lre.12430","url":null,"abstract":"<p>The present study focused on evaluating the quality of the Oued Guigou River located in Middle Atlas (Morocco) by studying relevant physicochemical and metallic parameters. Samples for determining the organic matter and trace metal elements trapped in water samples were collected at upstream of Oued Guigou between December 2020 and April 2021. The samples were analysed for physicochemical quality, while the trace metal elements (lead, zinc, copper, chromium, iron, nickel, calcium and magnesium) were determined using ICP-AES analysis. The results indicated significant organic pollution, as well as standard deviation and average changes in the values of the studied metals, most likely attributable to domestic effluents. The metal content in particular exhibited high values exceeding the recommended Moroccan standard limits, suggesting domestic and agricultural pollution is a potential threat to both the receiving rivers and their associated lakes and reservoirs.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50136525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights for lake restoration and water supply management in hilly regions","authors":"Arun Kumar,&nbsp;Kirti Goyal,&nbsp;P. K. Pande","doi":"10.1111/lre.12427","DOIUrl":"https://doi.org/10.1111/lre.12427","url":null,"abstract":"<p>Water resources around the world are facing serious threats attributable to various natural and anthropogenic activities. Civil societies around the world, including India, are facing increasing difficulty in the allocation and sustainable use of their available water resources. Many lakes and rivers, the major surface water sources in India, are highly polluted and on the verge of depletion. Accordingly, there is a growing interest in protecting the ecosystem services provided by the lakes and rivers using several management approaches for lake rejuvenation and conservation. A similar study focusing on water supply situation and its restoration was performed in Nainital, a major hill town located in the state of Uttarakhand. The lake water level has been declining in recent years, raising serious concerns. To address this issue, a plan has been developed to address the decreasing lake level and conserving this vital water supply source for the town. The present study provides an integrated framework enabling conservation practitioners to strategically implement water conservation actions to balance both the ecosystem and societal water needs.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50117117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water quality patterns, trends and variability over 17+ years in Phewa Lake, Nepal","authors":"Md. Akbal Husen,&nbsp;Richard G. Storey,&nbsp;Tek Bahadur Gurung","doi":"10.1111/lre.12426","DOIUrl":"https://doi.org/10.1111/lre.12426","url":null,"abstract":"<p>Phewa Lake, Nepal's second largest lake, has been the subject of many short-term water quality studies in the past, although the results of such studies have not been consistent. Long-term monitoring data can distinguish typical seasonal dynamics from atypical occurrences. Accordingly, the objective of the present study was to describe typical seasonal patterns and quantify variability, detect long-term trends and provide reliable baseline data for future trend detection. The present study provides 17 years of monthly water quality data (1993–2010) and occasional data to 2018 from the 0.5 to 10 m depth at one sampling site. Phewa Lake experiences a subtropical monsoonal climate, typically being stratified from March to September, although heavy rainfalls disrupted stratification. Bottom-water anoxia, occurring typically between April and June, was associated with increased ammonium concentrations, but not with increased dissolved reactive phosphorus concentrations. The observed nutrient and chlorophyll<i>-a</i> concentrations were generally typical of an oligo- to mesotrophic lake. The water clarity was lowest in the autumn and winter, being associated with high phytoplankton biomass, as well as during the summer, the latter likely attributable to suspended silt in the water. Lake surface waters warmed by 1.1–1.8°C during 1993–2018. Water clarity data suggested slight eutrophication from 1993 to 2018, although no increased nutrient or chlorophyll-<i>a</i> concentrations was detected up to 2010. The water clarity data gave no evidence of a long-term increase in the suspended sediment concentrations. All studied water quality variables exhibited high variability within and between years. The results of the present study provide a baseline for the detection of future water quality trends. The data confirm some previous research findings, while at the same time indicating long-term regular monitoring is needed to accurately characterize Phewa Lake's limnology and to detect long-term trends. Correct trend detection and proper understanding of the lake limnology are essential for proper management of Phewa Lake and other subtropical lakes. The present study represents one of only a few studies that examine water quality and other seasonality variables in subtropical lakes over multiple years.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50138814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salt load transfer and changing salinities across a new causeway breach in Great Salt Lake: Implications for adaptive management","authors":"Phil D. Brown,&nbsp;Thomas Bosteels,&nbsp;Brad T. Marden","doi":"10.1111/lre.12421","DOIUrl":"https://doi.org/10.1111/lre.12421","url":null,"abstract":"<p>Gilbert Bay, the largest embayment of the expansive Great Salt Lake (GSL) in the United States, is a productive aquatic system providing a suite of ecosystem services, both locally and across hemispheric flyways and global aquaculture networks. Gilbert Bay is currently at a record low stand and elevated salinity attributable to the coupled effects of drought and human water use in the basin. However, a recent management berm at the breach in the mid-lake causeway provides a unique adaptive management tool to mitigate harmful salinity changes. The present study measured the fluctuating Gilbert Bay salinities and salt loads across a multi-year period of changing causeway breach management. Opening of the breach in 2016 and a high spring runoff in 2017 exported a substantial portion of Gilbert Bay salt load into adjacent Gunnison Bay, lowering the salinity–elevation relationship in Gilbert. The salt load in the bay has since returned to nearly pre-breach levels with salinities at the current low stand now exceeding the ecologically optimal range. The chronicled salt movement and salinity relationships were used to recommend short- and long-term adaptive management strategies for the causeway berm in order to sustain the crucial Gilbert Bay aquatic ecosystem in the face of drought and future variability, as well as highlighting the structural advantages GSL has over other saline lakes experiencing anthropogenic water loss.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.12421","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50138860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery","authors":"Mary Florence Nantongo,&nbsp;Joseph Edebe,&nbsp;Elick O. Otachi,&nbsp;Julius Kipkemboi","doi":"10.1111/lre.12424","DOIUrl":"https://doi.org/10.1111/lre.12424","url":null,"abstract":"<p>The present study was conducted to assess the levels of selected organochlorine pesticide (OCP) residues in water, sediments and Nile tilapia, as well as the potential health risks to humans who consume the fish of Lake Nakuru. Nine composite water and nine sediment samples, as well as 30 fish specimens, were collected from five representative sampling sites within Lake Nakuru. The OCPs targeted in the present study included p,p′-Dichlorodiphenyl dichloroethane (p,p′-DDD), p,p′-dichlorodiphenyldichloroethylene (p,p′-DDE), p,p′-dichlorodiphenyltrichloroethane (p,p′-DDT), heptachlor, heptachlor epoxide, α endosulfan (1), β endosulfan (2), endosulfan sulphate, endrin, lindane, aldrin, dieldrin, methoxychlor and hexachlorocyclohexanes (alpha; beta; gamma; delta). Except for aldrin, all 16 OCPs targeted in the present study were detected. The OCP residue levels ranged from below detection limit (BDL) to 7.44 ± 0.66 μg/L, BDL to 6.39 ± 1.10 μg/kg ww and BDL to 319.74 ± 66.94 μg/kg ww in water, sediment and fish samples respectively. Some OCP concentrations exhibited significant differences across the sampling sites (<i>p</i> &lt; .05). The residue level of endosulfan was above the European Union standard, whereas the target hazard quotient of heptachlor epoxide was above 1, therefore being unsafe for human consumption. The present study results indicate that most of organochlorine pesticides though banned in Kenya are still detected in the environment, posing potential long-term health hazards to humans. Accordingly, environmental monitoring programme and mitigation strategies of reducing pollutant inputs into the lake is recommended, as well as an immediate ban on harvesting and consumption of fish from Lake Nakuru.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50138861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lake eutrophication: Control of phytoplankton overgrowth and invasive aquatic weeds","authors":"Temesgen Tola Geletu","doi":"10.1111/lre.12425","DOIUrl":"https://doi.org/10.1111/lre.12425","url":null,"abstract":"<p>This brief review describes the major causes of lake cultural eutrophication and assesses different strategies applied to control or reduce the negative consequences of this eutrophication. Excessive nutrient inputs, particularly from agricultural lands through non-point source runoff, are among the main causes of cultural eutrophication on a global scale. Reducing nutrient inputs from agricultural lands through management of lake catchment areas, therefore, is an integral part of any effort to control lake eutrophication. Nutrient enrichment results in algal blooms and creates favourable condition for the invasion of a lake by alien aquatic weeds, making this invaluable freshwater resource unsuitable for many purposes, including drinking, agricultural and industrial water resources, fishing, transportation and recreational purposes. A major part of this review addresses attempts made to address the negative impacts of eutrophication by restoring water quality. Several research outputs discussing bottom-up and top-down control mechanisms were utilized for the present review. Much emphasis has been given in the literature regarding the use of biomanipulation as a promising and sustainable solution for controlling eutrophication. Biomanipulation tools used to control cyanobacteria and algal bloom have involved zooplanktivorous fish removal, piscivorous fish stocking, daphnia stocking, benthivorous fish removal, planktivorous fish stocking and mussel stocking. Further, some insect and fungal species have been used as biological control agents in an effort to control invasive aquatic weeds in tropical lakes. Although this review is limited in its analysis and explanation of the drawbacks associated with each described biomanipulation method, it can be deduced that biomanipulation generally exhibits considerable potential for controlling or reducing phytoplankton overgrowth and aquatic weed invasions, assuming it is also integrated with strategies to control external nutrient loadings to lakes.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50129815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the current trophic state and water quality of Lake Naivasha, Kenya using multivariate techniques","authors":"Edwine Yongo,&nbsp;Simon W. Agembe,&nbsp;Julius O. Manyala,&nbsp;Eunice Mutethya","doi":"10.1111/lre.12422","DOIUrl":"https://doi.org/10.1111/lre.12422","url":null,"abstract":"<p>Lake Naivasha is a tropical freshwater body in Kenya, providing a source of livelihoods to the surrounding communities. The lake ecosystem, however, has become degraded over time because of increasing pollutant loads from multiple sources, including human settlements and agricultural and surface runoff in its basin. Thus, it is vital to study the lake's water quality to determine its current status to inform appropriate management measures. Accordingly, the present study analysed water quality parameters and the trophic state of Lake Naivasha on the basis of water samples collected at eight sampling sites during the dry and wet seasons from December 2019 to May 2020. The physico-chemical parameters were measured in situ, while nutrients were analysed in the laboratory. The results indicated high turbidity, total nitrogen (TN), ammonium-nitrogen (NH₄⁺-N), nitrate-N (NO₃-N) and total phosphorus (TP) levels during the wet season, and at the Malewa and Karati River mouths, while pH, electrical conductivity (EC) and chlorophyll-<i>a</i> values were relatively high during the dry season. The water temperature and dissolved oxygen (DO) concentration, however, did not vary between sampling sites or seasons. Cluster analysis (CA) classified the sites into three clusters based on water quality spatial and seasonal variations. Cluster 1 was comprised of the isolated region (Crescent), while clusters 2 and 3 mainly comprised sites sampled during wet and dry seasons, respectively. Similarly, principal component analysis (PCA) revealed spatial and seasonal physico-chemical variations, indicating nutrient parameters (TN, TP, NO₃-N and NH₄⁺-N), pH, Secchi depth and turbidity are the major variables influencing water quality variations. Furthermore, factor analysis (FA) identified nutrients, sediment and organic sources as the main lake pollution sources. The trophic state index (TSI = 60–72) indicated the lake varied from a eutrophic to hypertrophic state during the study period. The lake was found to be more eutrophic than reported in previous studies, indicating a progressive deterioration of its water quality. The overall results demonstrated some of the sampling sites in the lake are heavily contaminated with pollutants from various sources, attributable primarily to land use patterns and anthropogenic activities. The results of the present study are useful to inform decisions regarding management of the lake water quality.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50148839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alternate reservoir operating policies for Lake Victoria in East Africa: A framework for balancing transboundary and local water demands","authors":"Duncan Kikoyo,&nbsp;Ralph Wurbs,&nbsp;Srinivasulu Ale,&nbsp;Patricia Smith","doi":"10.1111/lre.12420","DOIUrl":"https://doi.org/10.1111/lre.12420","url":null,"abstract":"<p>The reliability and impact of several regulation policies on Lake Victoria in East Africa were investigated using the Water Rights Analysis Package (WRAP). Its reliability is determined by establishing the risk of policies failing to meet water demands. The impacts on the lake are evaluated by assessing the effect of policies for lake levels. Policies are based on (i) the lake's firm and safe water yields and (ii) dam turbine configurations at the lake's outlet. The present study demonstrated the applicability of WRAP in modelling large complex reservoirs and determined that constant release policies with a maximum limit of 1015 m³/s have low risks of failure and improve lake water-level stability.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of age estimates and population characteristics for green sunfish using two otolith methods","authors":"Austin D. Griffin,&nbsp;Michael J. Porta,&nbsp;Richard A. Snow","doi":"10.1111/lre.12419","DOIUrl":"https://doi.org/10.1111/lre.12419","url":null,"abstract":"<p>Dependent on the specific fishery, green sunfish (<i>Lepomis cyanellus</i>) can be viewed as a benefit or a detriment. Regardless, effective management of this species relies on precise age estimation, which is critical to detail age structure, growth and recruitment rates of their populations. To determine the most precise method for age estimation, estimated ages of whole and cracked otoliths of 422 green sunfish were compared from three small impoundments (0.6–16.2 ha) in Oklahoma. Green sunfish ages ranged from 0 to 7 for cracked otoliths and 0 to 6 for whole-viewed otoliths, depending on the population. High precision between readers was observed for whole (per cent agreement = 85%–96%; mean CV = 3.4%–4.8%; and average per cent error = 2.4%–3.4%) and cracked otoliths (per cent agreement = 92%–96%; mean CV = 0.3%–6.3%; and average per cent error = 0.3%–4.4%). Limited bias was observed for young fish (≤age 3) for evaluating between-reader precision using whole otoliths. When bias was present, ages generally exceeded the 1:1 line of equivalency. Final consensus ages for older fish (≥age 5) were sometimes underestimated using whole otoliths, compared to cracked otoliths. Fair agreement for final consensus ages (73%–87%) between whole and cracked otoliths was observed, compared to other otolith ageing studies in the literature. However, the results of the present study indicated no significant differences in growth or age-frequency estimates using ages derived from whole and cracked otoliths, suggesting the moderate level of consensus agreement was not sufficiently low to significantly impact population characteristics and subsequent management decisions. Green sunfish growth rates in Oklahoma appear sufficiently high to allow the use of whole otoliths for age estimation to age seven, unless slow growth is expected. To ensure precise age estimation, however, it is suggested that otoliths from green sunfish ≥age 5 be cracked, regardless of growth rates.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.12419","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}