Lakes and Reservoirs: Research and Management最新文献

{"title":"A comprehensive review of invasion and ecological impacts of introduced common carp (Cyprinus carpio) in Lake Naivasha, Kenya","authors":"Eunice Mutethya,&nbsp;Edwine Yongo","doi":"10.1111/lre.12386","DOIUrl":"https://doi.org/10.1111/lre.12386","url":null,"abstract":"<p>Invasive fish species pose considerable threats to aquatic biodiversity. The fishery of Lake Naivasha was enhanced by introduction of invasive fish species, including carp. The present study examined factors driving successful carp invasions, and their ecological impacts, knowledge of both being essential for management purposes. The present study revealed that carp invaded the lake, probably due to its adaptive traits such as environmental tolerance, fast growth, high fecundity, early sexual maturation and food flexibility. It reduced the biomass of <i>Oreochromis leucostictus</i>, <i>Coptodon zillii</i> and <i>Micropterus salmoides</i> which initially contributed to the fishery through competition and habitat degradation. It is noteworthy that the biomass of <i>Oreochromis niloticus</i> in the lake has recently increased and surpassed carp, attributable to a reduction in its predator (<i>M</i>. <i>salmoides</i>) and its biological traits. In terms of ecological effects, carp enhance water turbidity and stimulate algal growth by resuspending sediments and associated nutrients through its foraging activities. Although direct removal has been a useful practice for controlling carp in other places, this approach might be impractical for Lake Naivasha, since carp is the main species sustaining the lake fishery. Instead, implementation of effective management measures, including control of fishing effort, pollution control and protection of surrounding wetlands, would promote recovery and long-term sustainability of the fishery resources of this lake.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91842529","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":"Acknowledgment of Reviewers","authors":"","doi":"10.1111/lre.12387","DOIUrl":"https://doi.org/10.1111/lre.12387","url":null,"abstract":"","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91820151","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":"The influence of environmental parameters on the phytoplankton community of two tropical reservoirs","authors":"Jessica Chappell,&nbsp;Stefanie Whitmire,&nbsp;David Sotomayor-Ramírez,&nbsp;Gustavo Martínez","doi":"10.1111/lre.12384","DOIUrl":"https://doi.org/10.1111/lre.12384","url":null,"abstract":"<p>Previous studies have indicated certain environmental variables such as rainfall, nutrient concentrations and mixing events can be strong drivers of the phytoplankton community structure in reservoirs. Shifts in the phytoplankton community composition of Puerto Rican reservoirs, however, are not well understood. The present study identified the spatial and temporal changes in the phytoplankton community structure of two reservoirs in Puerto Rica, and which environmental parameters determined the structure. Whether or not the main environmental variables varied on the basis of the initial trophic status of the reservoirs was also explored. Two Puerto Rican reservoirs, one classified as mesotrophic and the other as eutrophic, were sampled on three sampling dates, with the reservoirs into three zones (dam; transition; riverine). Physical parameters were recorded at each sampling site, nutrient concentrations were measured, and the phytoplankton community biomass and diversity were determined. A canonical correspondence analysis (CCA) was run for each reservoir to explore which variables determined the phytoplankton community composition. Temperature, pH and total phosphorus concentration were the main drivers of the phytoplankton community composition for the mesotrophic reservoir, while specific conductance, pH, total phosphorus and nitrate were the main explanatory variables. Although the driving variables changed between the reservoirs, the temporal shifts observed in the phytoplankton community structure were consistent for both reservoirs regardless of their trophic status. The findings of the present study suggest that, although shifts in the phytoplankton community structure are similar in reservoirs with differing initial trophic status, the environmental variables driving community composition may nevertheless vary. Accordingly, tropical reservoirs managers should consider a reservoir's initial trophic status when evaluating what environmental parameters may lead to changes in its phytoplankton community structure. The present study represents a first step at examining the variables driving phytoplankton community structure in Puerto Rican reservoirs.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91882510","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":"18th World Lake Conference","authors":"","doi":"10.1111/lre.12383","DOIUrl":"https://doi.org/10.1111/lre.12383","url":null,"abstract":"","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91879801","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":"The role of fishery management and environmental variables on the fish fauna in floodplain lakes in the lower Purus River, Amazon Basin, Brazil","authors":"Bruno Ferezim Morales,&nbsp;Cláudia Pereira de Deus","doi":"10.1111/lre.12385","DOIUrl":"https://doi.org/10.1111/lre.12385","url":null,"abstract":"<p>Periodically flooded environments in the Amazon River basin are recognized as being highly productive because of their limnological dynamics and ecological heterogeneity. They also have been historically impacted by fishery activities, therefore being crucial ecosystems to be considered in small-scale conservation policies. Previous studies, however, did not detect or assess significant or consistent positive effects of combinations between protected areas or environmental variables on ichthyofauna. Accordingly, the present study analysed the effects of fishery management (hereafter categorization of lakes) and environmental characteristics on the attributes of fish assemblages in 20 floodplain lakes (eight categorized as open access; 12 categorized as protected lakes) inserted in a legally protected area, the Reserva de Desenvolvimento Sustentável Piagaçu-Purus (RDS-PP) in the lower Purus River, Amazonas State, Brazil. The results of the present study indicated depth, surface area and lake categorization synergistically influenced the ichthyofauna of these floodplain lakes. It also suggests this influence should not be treated separately in management policies. It was concluded that the potential effectiveness of fishery management in floodplain lakes is closely related to small-scale (i.e. local) interventions, with emphasis on the role of the lakes as a unit of effective management of ichthyofauna in floodplains. Furthermore, participatory decisions during the process of elaborating management plans for floodplain lakes should consider environmental attributes relevant to biological communities and traditional knowledge.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91567329","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":"Macrobenthos-based RBP II (Rapid Bioassessment Protocol II) as a tool to assess the sediment and water quality in a treated textile effluent receiving stream ecosystem associated with a wetland marsh: A case study from Sri Lanka","authors":"W. M. Dimuthu Nilmini Wijeyaratne,&nbsp;Uditha Prabhath Liyanage","doi":"10.1111/lre.12382","DOIUrl":"https://doi.org/10.1111/lre.12382","url":null,"abstract":"<p>Macrobenthos are important bioindicators of organic and nutrient pollution. The present study used the macrobenthos-based rapid bioassessment protocol (RBP II) to study the effects of treated textile effluent inputs into a natural stream ecosystem connected to a wetland marsh. Three reference sites and three sites receiving point source inputs from a textile effluent treatment plant were selected. The physical and chemical parameters, and the abundance and diversity of macrobenthos at each site, were assessed during the rainy and dry seasons of 2020. Although the water quality parameters at the sites representing the point source inputs did not exceed the standard textile effluent discharge limits, a significant influence on the macrobenthic community composition was observed at the effluent discharge receiving sites. The dominant macrobenthos in the ecosystem (<i>Baetis</i> sp., <i>Leptophlebia</i> sp; <i>Tubifex</i> sp.) exhibited significant correlations with lead, copper, chromium and cadmium concentrations of the water and sediments. The Shannon–Weiner Diversity Index, Family Biotic Index, EPT Index and EPT/C ratio used in the rapid bioassessment protocol indicated significantly strong correlations with the water and sediment quality parameters, demonstrating their suitability to be used as a tool for biological measurements in aquatic ecosystems receiving textile effluents.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91922257","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, phytoplankton composition and microcystin concentrations in Kisumu Bay (Kenya) of Lake Victoria after a prolonged water hyacinth infestation period","authors":"Jared Babu Miruka,&nbsp;Albert Getabu,&nbsp;Lewis Sitoki,&nbsp;Onchieku James,&nbsp;Job Mwamburi,&nbsp;Ogendi George,&nbsp;Nyamweya Chrisphine,&nbsp;Cyprian Odoli","doi":"10.1111/lre.12380","DOIUrl":"https://doi.org/10.1111/lre.12380","url":null,"abstract":"<p>The production of phytoplankton (algal) toxins and their control is of concern because of the need to reduce their negative impacts on water quality and facilitate effective management of algal blooms. The present study was conducted between September 2017 to May 2018, focusing on Kisumu Bay in the Kenyan portion of Lake Victoria, in order to establish the magnitude of potential impacts on phytoplankton composition and microcystin following a prolonged presence of water hyacinth coverage between 2013 and 2018 within the gulf, with an estimated coverage range varying between 644 and 1224 ha. Triplicate samples of physico-chemical parameters, nutrients, phytoplankton, chlorophyll-<i>a</i> and algal toxins (<i>N</i> = 88) were collected at eleven sampling sites to determine their spatio-temporal variability. The main identified algal taxa comprised Cyanophyceae, Bacillariophyceae, Chlorophyceae, Euglenophyceae, Zygnematophyceae and Dinophyceae. The most dominant algal species were <i>Microcystis aeruginosa</i> (25%), <i>Merismopedia</i> spp. (23%) and <i>Anabaena flos</i>-<i>aquae</i> (16%). Enzyme-linked immunosorbent assay (ELISA) technique was used to determine microcystin (MC) toxins in the water. Mean MC-LR and MC-YR concentrations were significantly correlated (<i>R</i>² = 0.972), exceeding WHO standards at three sampling sites (Coca Cola, 2.84 ± 4.76; Kisumu pier, 1.78 ± 1.87; Midpoint, 1.44 ± 2.71 μg/L MC–LR). There were significant temporal variations (<i>p</i> &lt; .05) in the SRP, TN, NO₃-N, NO₂-N, NH₄-N, SiO₂-Si, MC-LR, MC-YR, dissolved oxygen (DO), total dissolved and suspended solids (TDS; TSS), turbidity, electrical conductivity, Secchi depth, temperature and pH levels. The water depth, TP and DO also vary spatially. The nitrogen to phosphorus concentration ratios differed from the expected N:P ratio of 16:1, indicating a highly eutrophic status. The disproportionate ratio of total phosphorus and total nitrogen in the bay may be responsible for the enhanced cyanobacterial blooms it exhibits. The results of the present study provide useful information and data for formulating regulations for water quality management.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91938612","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":"Life-history traits of Guntea loach, Lepidocephalichthys guntea (Hamilton, 1822) in the Payra River, southern Bangladesh","authors":"Newton Saha,&nbsp;Prosun Roy,&nbsp;Zubyda Mushtari Nadia,&nbsp;SM Majharul Islam,&nbsp;Md. Yeamin Hossain","doi":"10.1111/lre.12378","DOIUrl":"https://doi.org/10.1111/lre.12378","url":null,"abstract":"<p>The present study provides the first wide-ranging elucidation of life-history traits, including length–frequency distribution (<i>LFD</i>), length–weight and length–length relationship (<i>LWR</i> and <i>LLR</i>), form factor (<i>a</i>_<i>3.0</i>), best condition factor (allometric, <i>K</i><i>_A</i>; Fulton, <i>K</i><i>_F</i>; relative, <i>K</i><i>_R</i>; and relative weight, <i>W</i><i>_R</i>), length at first maturity (<i>L</i><i>_m</i>), natural mortality (<i>M</i><i>_w</i>) and optimum catchable length (<i>L</i><i>_opt</i>) of <i>Lepidocephalichthyes guntea</i> from the Payra River in southern Bangladesh. A total of 470 fishes were randomly collected seasonally from February 2019 to January 2020, using several traditional fishing gears (cast nets; drag nets; lift nets; and gill nets). The total length (TL), standard length (SL) and total body weight (BW) of each individual fish were measured with a 0.01 cm and 0.01 g precision, respectively. The TL size classes of 6.00–6.99 cm and 7.00–7.99 cm TL were the numerically dominant groups among the total fish population. Exponential <i>b</i> values of <i>LWR</i> (TL vs. BW) indicate a positive allometric growth (<i>b</i> = 3.20) pattern in the Payra River. The <i>b</i> value of <i>LLR</i> also indicates the same growth pattern. The estimated <i>a</i>_3.0 value was 0.007, indicating the fish has an elongated body profile. Among the four types of condition factors, <i>K</i>_F is the best-suited tool for evaluating the well-being of <i>L</i>. <i>guntea</i> in the Payra River. Additionally, <i>W</i>_R exhibited very significant divergence from 100 (<i>p</i> &lt; .0001), designating an imbalanced habitat for <i>L</i>. <i>guntea</i>. The calculated <i>L</i>_m, <i>M</i>_w and <i>L</i>_opt values were 6.54 (~6.5 cm) in TL, 1.16/year and 7.46 cm TL for <i>L</i>. <i>guntea</i> in the Payra River, respectively. Thus, the results of the present study could be used in the future for improved management of this species in Payra River, as well as for linking ecosystems.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/lre.12378","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91800148","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":"A new lake algae detection method supported by a drone-based multispectral camera","authors":"Veronika Zsófia Tóth,&nbsp;János Grósz,&nbsp;Márta Ladányi,&nbsp;András Jung","doi":"10.1111/lre.12377","DOIUrl":"https://doi.org/10.1111/lre.12377","url":null,"abstract":"<p>Algal detection and quantification are essential steps needed to maintain the appropriate ecological status of freshwater bodies. Although there are still some technical issues to be addressed, remote sensing technologies possess benefits over traditional testing methods. To overcome these difficulties, algal concentrations at selected locations in Lake Balaton, Hungary, were determined with the use of a multispectral camera, mounted by a 3D printed tool on a drone. The algae concentration was defined from three different camera output variables, including light level, irradiance and reflectance. The determination was based on blue/green and also NIR/red indices. To validate the method, results from drone measurements were compared to laboratory measurements of collected water samples from the same 29 sites at which the drone camera took images. Pearson's correlation was applied to test the agreement of the measured and method-derived values. The blue/green ratio proved to be a more adequate input than NIR/RED, with the highest correlation being produced by the light level, blue/green ratio-based data that exhibited a highly significant Pearson correlation coefficient (<i>r</i> = .96). This newly developed drone-based method was shown to provide notably better spatial resolution than the satellites. Accordingly, the newly developed, quick-process measurements obtained in the present study can be done as frequently as required with a markedly lower budget.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/lre.12377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91883902","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":"Population structure of a newly recorded (Halodule uninervis) and native seagrass (Halophila ovalis) species from an intertidal creek ecosystem","authors":"Amrit Kumar Mishra,&nbsp;Mukunda Kesari Khadanga,&nbsp;Shesdev Patro,&nbsp;Deepak Apte,&nbsp;Syed Hilal Farooq","doi":"10.1111/lre.12376","DOIUrl":"https://doi.org/10.1111/lre.12376","url":null,"abstract":"<p>The presence of the seagrass <i>Halodule uninervis</i> was documented for the first time outside the Chilika lagoon at Haripur creek, along with previously documented <i>Halophila ovalis</i> from the same region. The population structure (density; biomass; leaf growth rate; and morphometrics) and environmental parameters was assessed for both seagrass species. The pH levels of the water column above both seagrass meadows were lower than the standard oceanic pH of 8.2, likely attributable to upstream freshwater influences. <i>Halophila ovalis</i> grew on sandy and <i>H. uninervis</i> on silty substrates. High nutrient (nitrate and phosphate) concentrations in the water column of the creek influenced the growth of macroalgae (<i>Ceramium</i> sp. and <i>Gracilaria verrucosa</i>) on the leaves of <i>H. uninervis</i>. Leaf reddening was only observed in <i>H</i>. <i>ovalis</i> leaves. Under similar environmental conditions, the shoot density and biomass (above- and below-ground) of <i>H</i>. <i>ovalis</i> were 2-fold lower that for <i>H. uninervis</i>. The leaves of <i>H. uninervis</i> were 9-fold longer than <i>H</i>. <i>ovalis</i>, whereas <i>H</i>. <i>ovalis</i> had 5-fold wider leaves than <i>H. uninervis</i>. The leaf plastochrone interval of <i>H</i>. <i>ovalis</i> (2.3 days) and <i>H. uninervis</i> (9.6 days) was similar for the Indian Ocean region. Consequently, the <i>H</i>. <i>ovalis</i> leaf growth rate was 2-fold lower than that for <i>H. uninervis</i>. <i>H</i>. <i>ovalis</i> shoot internodes were 2.6-fold longer than for <i>H. uninervis</i>, whereas the root lengths of <i>H. uninervis</i> were longer than for <i>H</i>. <i>ovalis</i>. The shorter root length of <i>H</i>. <i>ovalis</i> resulted in a higher branching frequency than for <i>H. uninervis</i>. The total C and N content were higher in the <i>H</i>. <i>ovalis</i> leaves than those of <i>H. uninervis</i>. This study suggest seagrass responses to similar environmental conditions are species-specific. Regular assessment of the seagrass population structure and water quality monitoring of Haripur creek are essential for better management and conservation of these important seascapes.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"26 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/lre.12376","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91865027","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}