Pub Date : 2020-12-16DOI: 10.1080/10402381.2020.1843207
P. Patrick, Marilena Di Giuseppe, H. Manolopoulos, Motofumi Tai, J. Poulton, Jeff A. Wright
Abstract Patrick PH, Di Giuseppe M, Manolopoulos H, Tai M-K, Poulton S, Wright J. 2020. Entrainment of fish eggs and larvae at an operating nuclear generating station using improved methodology. Lake Reserv Manage. 37:186–198. Entrainment data collected from 7 December 2015 to 22 November 2016 at the Darlington Nuclear Generating Station (DNGS) using automated sampling methodology are discussed in this article, including numbers of fish eggs and larvae entrained. We used a more robust sampling design than previously used in 2004 and 2006, which involved more frequent sampling over a longer, 12 month period. The design allowed collection of daily samples with a longer sampling duration and higher total sample volumes that reduced variability compared to previous studies with less robust sampling throughout a day. Our study resulted in the capture of deepwater sculpin and burbot that were not observed in previous entrainment studies. The maximum entrainment density for eggs was about 17 times higher than that for larvae. The entrainment of fish eggs was highest in the summer months (June and July) and did not vary diurnally. The highest entrainment rates for larvae occurred during the months of August and September, with higher densities entrained at night. We recommend the use of both increased sampling frequency and sampling volumes to characterize fish entrainment for water users in the Great Lakes watershed.
摘要Patrick PH，Di Giuseppe M，Manolopoulos H，Tai M-K，Poulton S，Wright J.2020。使用改进的方法在运行中的核电站捕获鱼卵和幼虫。湖泊保护区管理。37:186–198。本文讨论了2015年12月7日至2016年11月22日在达林顿核电站（DNGS）使用自动采样方法收集的夹带数据，包括夹带的鱼卵和幼虫数量。我们使用了比2004年和2006年更稳健的采样设计，该设计涉及在更长的12个月内更频繁的采样。该设计允许以更长的采样持续时间和更高的总样本量收集每日样本，与之前全天采样不太稳健的研究相比，这降低了变异性。我们的研究结果捕获了深水双桨和burbot，这在以前的夹带研究中没有观察到。卵的最大夹带密度大约是幼虫的17倍。鱼卵的夹带量在夏季月份（6月和7月）最高，昼夜变化不大。幼虫的最高夹带率发生在8月和9月，夜间夹带的密度更高。我们建议使用增加的采样频率和采样量来表征大湖流域用水者的鱼类夹带情况。
{"title":"Entrainment of fish eggs and larvae at an operating nuclear generating station using improved methodology","authors":"P. Patrick, Marilena Di Giuseppe, H. Manolopoulos, Motofumi Tai, J. Poulton, Jeff A. Wright","doi":"10.1080/10402381.2020.1843207","DOIUrl":"https://doi.org/10.1080/10402381.2020.1843207","url":null,"abstract":"Abstract Patrick PH, Di Giuseppe M, Manolopoulos H, Tai M-K, Poulton S, Wright J. 2020. Entrainment of fish eggs and larvae at an operating nuclear generating station using improved methodology. Lake Reserv Manage. 37:186–198. Entrainment data collected from 7 December 2015 to 22 November 2016 at the Darlington Nuclear Generating Station (DNGS) using automated sampling methodology are discussed in this article, including numbers of fish eggs and larvae entrained. We used a more robust sampling design than previously used in 2004 and 2006, which involved more frequent sampling over a longer, 12 month period. The design allowed collection of daily samples with a longer sampling duration and higher total sample volumes that reduced variability compared to previous studies with less robust sampling throughout a day. Our study resulted in the capture of deepwater sculpin and burbot that were not observed in previous entrainment studies. The maximum entrainment density for eggs was about 17 times higher than that for larvae. The entrainment of fish eggs was highest in the summer months (June and July) and did not vary diurnally. The highest entrainment rates for larvae occurred during the months of August and September, with higher densities entrained at night. We recommend the use of both increased sampling frequency and sampling volumes to characterize fish entrainment for water users in the Great Lakes watershed.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"186 - 198"},"PeriodicalIF":1.5,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1843207","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44148152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-04DOI: 10.1080/10402381.2020.1839606
J. Stager, L. Harvey, Scott Chimileski
Abstract Stager JC, Harvey L, Chimileski S. 2020. Long-term cultural eutrophication in White and Walden Ponds (Concord, Massachusetts, USA), Thoreau’s lakes of light. Lake Reserv Manage. XX:XXX–XXX. Two historically important ponds in the vicinity of Boston, MA, were subjected to a comparative paleolimnological investigation of the timing and causes of eutrophication trends in each. The remarkable clarity of White Pond during the early 19th century led Henry David Thoreau to compare it favorably to nearby Walden Pond, but during the 20th century water quality in both ponds declined. Sediment core studies show that cultural eutrophication began at Walden during the 1930s, but no long-term sediment records have been available for White Pond, which makes it more difficult to determine the history and causes of eutrophication there. Here we use microfossil and geochemical analyses of sediment cores to show that major changes in the diatom community of White Pond began around 1900, when fish stocking commenced and soil erosion due to land use in the watershed increased, and that the trend intensified around 1960 and 1990. We also describe efforts to mitigate eutrophication at White Pond, highlight the ecological importance of benthic vegetation in nutrient cycling, and suggest that threats to water quality in both of these ponds will likely increase due to anticipated climatic changes in the region.
{"title":"Long-term cultural eutrophication in White and Walden Ponds (Concord, Massachusetts, USA), Thoreau's lakes of light","authors":"J. Stager, L. Harvey, Scott Chimileski","doi":"10.1080/10402381.2020.1839606","DOIUrl":"https://doi.org/10.1080/10402381.2020.1839606","url":null,"abstract":"Abstract Stager JC, Harvey L, Chimileski S. 2020. Long-term cultural eutrophication in White and Walden Ponds (Concord, Massachusetts, USA), Thoreau’s lakes of light. Lake Reserv Manage. XX:XXX–XXX. Two historically important ponds in the vicinity of Boston, MA, were subjected to a comparative paleolimnological investigation of the timing and causes of eutrophication trends in each. The remarkable clarity of White Pond during the early 19th century led Henry David Thoreau to compare it favorably to nearby Walden Pond, but during the 20th century water quality in both ponds declined. Sediment core studies show that cultural eutrophication began at Walden during the 1930s, but no long-term sediment records have been available for White Pond, which makes it more difficult to determine the history and causes of eutrophication there. Here we use microfossil and geochemical analyses of sediment cores to show that major changes in the diatom community of White Pond began around 1900, when fish stocking commenced and soil erosion due to land use in the watershed increased, and that the trend intensified around 1960 and 1990. We also describe efforts to mitigate eutrophication at White Pond, highlight the ecological importance of benthic vegetation in nutrient cycling, and suggest that threats to water quality in both of these ponds will likely increase due to anticipated climatic changes in the region.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"2 - 18"},"PeriodicalIF":1.5,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1839606","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45063818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-03DOI: 10.1080/10402381.2020.1839824
N. Mundahl, J. Hoisington
Abstract Mundahl ND, Hoisington J. 2020. Game fish response to dredging of a eutrophic urban lake in Minnesota. Lake Reserv Manage. 37:170–185. We compared relative abundances, average weights, and growth rates of 6 game fish species before and after the 1999–2001 partial dredging of Lake Winona, a eutrophic, urban lake in Minnesota, to determine whether lake dredging sustainably changed fish population structure to the benefit of anglers. Relative catch rates (trap nets, gill nets, electrofishing) and growth rates were obtained from various fish population assessments and lake surveys conducted by the Minnesota Department of Natural Resources (MN DNR) from 1980 to 2016 for both Lake Winona and Lake Oscar, an ecologically similar lake that has not been dredged. Before-after control-impact (BACI) analyses revealed that compared to Lake Oscar, relative catch rates in Lake Winona after dredging declined significantly for bluegill (Lepomis macrochirus), black crappie (Pomoxis nigromaculatus), and northern pike (Esox lucius), and increased significantly for walleye (Sander vitreus) and largemouth bass (Micropterus salmoides). Average weights of yellow perch (Perca flavescens) and pike increased significantly after dredging. Only black crappie displayed improved growth after dredging. Largemouth bass catch rates for quality- and preferred-size fish increased in postdredging surveys. Although predredging data are lacking, population size structures and relative weights of bluegill, crappie, and bass post dredging were within ranges that meet MN DNR management objectives. Overall, dredging of Lake Winona was followed by improved quality and structure of game fish populations in this system, something that decades of previous biomanipulation and macrophyte management had not accomplished.
{"title":"Game fish response to dredging of a eutrophic urban lake in Minnesota","authors":"N. Mundahl, J. Hoisington","doi":"10.1080/10402381.2020.1839824","DOIUrl":"https://doi.org/10.1080/10402381.2020.1839824","url":null,"abstract":"Abstract Mundahl ND, Hoisington J. 2020. Game fish response to dredging of a eutrophic urban lake in Minnesota. Lake Reserv Manage. 37:170–185. We compared relative abundances, average weights, and growth rates of 6 game fish species before and after the 1999–2001 partial dredging of Lake Winona, a eutrophic, urban lake in Minnesota, to determine whether lake dredging sustainably changed fish population structure to the benefit of anglers. Relative catch rates (trap nets, gill nets, electrofishing) and growth rates were obtained from various fish population assessments and lake surveys conducted by the Minnesota Department of Natural Resources (MN DNR) from 1980 to 2016 for both Lake Winona and Lake Oscar, an ecologically similar lake that has not been dredged. Before-after control-impact (BACI) analyses revealed that compared to Lake Oscar, relative catch rates in Lake Winona after dredging declined significantly for bluegill (Lepomis macrochirus), black crappie (Pomoxis nigromaculatus), and northern pike (Esox lucius), and increased significantly for walleye (Sander vitreus) and largemouth bass (Micropterus salmoides). Average weights of yellow perch (Perca flavescens) and pike increased significantly after dredging. Only black crappie displayed improved growth after dredging. Largemouth bass catch rates for quality- and preferred-size fish increased in postdredging surveys. Although predredging data are lacking, population size structures and relative weights of bluegill, crappie, and bass post dredging were within ranges that meet MN DNR management objectives. Overall, dredging of Lake Winona was followed by improved quality and structure of game fish populations in this system, something that decades of previous biomanipulation and macrophyte management had not accomplished.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"170 - 185"},"PeriodicalIF":1.5,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1839824","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42012382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-20DOI: 10.1080/10402381.2020.1839607
D. Canfield, R. Bachmann, M. Hoyer
Abstract Canfield DE Jr, Bachmann RW, Hoyer MV. 2020. Restoration of Lake Okeechobee, Florida: mission impossible? Lake Reserv Manage. XX:XXX–XXX. Legally mandated eutrophication restoration goals for Lake Okeechobee (FL) are unachievable, therefore assigning managers a “mission impossible.” Since the 1970s, restoration efforts have focused on reducing pelagic total phosphorus (TP) to ∼40 µg/L. A total daily maximum load (TMDL) of 140 metric tons (t)/yr was adopted by the Florida Department of Environmental Protection in 1999 (effective date 2015) to restore the lake’s balance of flora and fauna. Phosphorus (P) loads (1975–2018) averaged 516 t/yr with no significant change over time, yet average TP significantly increased from 51 µg/L (1974–1977) to 146 µg/L (2015–2019). Greater TP values in 2019 were due to Hurricane Irma and an early June storm event. Annual P-loads and pelagic TP were not significantly correlated. Instead, TP was strongly correlated with turbidity (R 2 = 0.85), which is generated by wave-driven resuspension of P-rich unconsolidated sediments. Since 1973, >13,000 t of TP has been added to Okeechobee’s sediments that have accumulated over the past century due to the lowering of water levels and the construction of the Herbert Hoover Dike. Prior to settlement, high water levels allowed turbid lake waters to flood large areas of adjacent wetlands, where suspended sediments were removed from the lake. With the minimization of this self-cleansing mechanism after construction of the Herbert Hoover Dike, P-rich fine sediments accumulated, and periodic hurricanes disrupted consolidated sediments. Unconsolidated sediments are easily resuspended into the water column, raising TP. Efforts to reduce Okeechobee’s pelagic TP through reductions of P-loads alone will not work due to sediment accumulation and resuspension.
摘要Canfield DE Jr，Bachmann RW，Hoyer MV.2020。修复佛罗里达州奥基乔比湖：任务不可能完成？湖泊保护区管理。XX： XXX–XXX。法律规定的Okeechobee湖富营养化恢复目标无法实现，因此给管理人员分配了一项“不可能完成的任务”。自20世纪70年代以来，恢复工作的重点是将上层总磷（TP）减少到-40 µg/L。佛罗里达州环境保护部于1999年（2015年生效）采用了140公吨/年的总日最大负荷（TMDL），以恢复湖泊的动植物平衡。磷（P）负荷（1975–2018）平均为516吨/年，随时间推移没有显著变化，但平均TP从51显著增加 µg/L（1974–1977）至146 µg/L（2015–2019）。2019年TP值的增加是由于飓风“伊尔玛”和6月初的风暴事件。年磷负荷与浮游TP无显著相关性。相反，TP与浊度密切相关（R2=0.85），浊度是由富P松散沉积物的波浪驱动再悬浮产生的。自1973年以来，由于水位下降和赫伯特·胡佛堤坝的建设，奥基乔比的沉积物在过去一个世纪中积累了13000吨以上的TP。在定居之前，高水位使浑浊的湖水淹没了邻近湿地的大片区域，那里的悬浮沉积物被从湖中清除。赫伯特·胡佛堤坝建成后，随着这种自我清洁机制的最小化，富含磷的细沉积物堆积起来，周期性飓风破坏了固结沉积物。松散的沉积物很容易再悬浮到水柱中，从而提高TP。由于沉积物积聚和再悬浮，仅通过减少磷负荷来减少Okeechobee的浮游TP的努力将不会奏效。
{"title":"Restoration of Lake Okeechobee, Florida: mission impossible?","authors":"D. Canfield, R. Bachmann, M. Hoyer","doi":"10.1080/10402381.2020.1839607","DOIUrl":"https://doi.org/10.1080/10402381.2020.1839607","url":null,"abstract":"Abstract Canfield DE Jr, Bachmann RW, Hoyer MV. 2020. Restoration of Lake Okeechobee, Florida: mission impossible? Lake Reserv Manage. XX:XXX–XXX. Legally mandated eutrophication restoration goals for Lake Okeechobee (FL) are unachievable, therefore assigning managers a “mission impossible.” Since the 1970s, restoration efforts have focused on reducing pelagic total phosphorus (TP) to ∼40 µg/L. A total daily maximum load (TMDL) of 140 metric tons (t)/yr was adopted by the Florida Department of Environmental Protection in 1999 (effective date 2015) to restore the lake’s balance of flora and fauna. Phosphorus (P) loads (1975–2018) averaged 516 t/yr with no significant change over time, yet average TP significantly increased from 51 µg/L (1974–1977) to 146 µg/L (2015–2019). Greater TP values in 2019 were due to Hurricane Irma and an early June storm event. Annual P-loads and pelagic TP were not significantly correlated. Instead, TP was strongly correlated with turbidity (R 2 = 0.85), which is generated by wave-driven resuspension of P-rich unconsolidated sediments. Since 1973, >13,000 t of TP has been added to Okeechobee’s sediments that have accumulated over the past century due to the lowering of water levels and the construction of the Herbert Hoover Dike. Prior to settlement, high water levels allowed turbid lake waters to flood large areas of adjacent wetlands, where suspended sediments were removed from the lake. With the minimization of this self-cleansing mechanism after construction of the Herbert Hoover Dike, P-rich fine sediments accumulated, and periodic hurricanes disrupted consolidated sediments. Unconsolidated sediments are easily resuspended into the water column, raising TP. Efforts to reduce Okeechobee’s pelagic TP through reductions of P-loads alone will not work due to sediment accumulation and resuspension.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"95 - 111"},"PeriodicalIF":1.5,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1839607","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42879662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-12DOI: 10.1080/10402381.2020.1836094
M. Sharifi, Z. Shahi
Abstract Sharifi MR, Shahi Z. 2020. Assessment of wind shelter conditions of an open water storage reservoir using wind shelter index. Lake Reserv Manage. XX:XXX–XXX. Identifying the wind-affected area in a given waterbody facilitates the implementation of some evaporation control methods because the amount of evaporation is a function of the wind shelter. In this study, a method is developed to identify the wind-affected area of open water in reservoirs, using the Dez Dam in Iran. Through the wind shelter index (Sx), which is most commonly used in snowy areas, the wind shelter was calculated at different points on the open water. The points were then categorized in terms of the wind shelter index values using cluster analysis. For this purpose, Sx values were calculated and then clustered using 28,321 points of the lake’s surface. Using this method, the water surface was classified into areas, with 5 parts having different wind sheltering. On average, a considerable part of the water surface of the lake (66%) was more exposed to the wind than other parts. Therefore, it can be predicted that the evaporation at these areas is higher than at other areas of the lake surface.
{"title":"Assessment of wind shelter conditions of an open water storage reservoir using wind shelter index","authors":"M. Sharifi, Z. Shahi","doi":"10.1080/10402381.2020.1836094","DOIUrl":"https://doi.org/10.1080/10402381.2020.1836094","url":null,"abstract":"Abstract Sharifi MR, Shahi Z. 2020. Assessment of wind shelter conditions of an open water storage reservoir using wind shelter index. Lake Reserv Manage. XX:XXX–XXX. Identifying the wind-affected area in a given waterbody facilitates the implementation of some evaporation control methods because the amount of evaporation is a function of the wind shelter. In this study, a method is developed to identify the wind-affected area of open water in reservoirs, using the Dez Dam in Iran. Through the wind shelter index (Sx), which is most commonly used in snowy areas, the wind shelter was calculated at different points on the open water. The points were then categorized in terms of the wind shelter index values using cluster analysis. For this purpose, Sx values were calculated and then clustered using 28,321 points of the lake’s surface. Using this method, the water surface was classified into areas, with 5 parts having different wind sheltering. On average, a considerable part of the water surface of the lake (66%) was more exposed to the wind than other parts. Therefore, it can be predicted that the evaporation at these areas is higher than at other areas of the lake surface.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"34 - 46"},"PeriodicalIF":1.5,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1836094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43712495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-28DOI: 10.1080/10402381.2020.1824047
Matthew A. Weber, L. Wainger, N. Harms, Geneviève M. Nesslage
Abstract Weber MA, Wainger LA, Harms NE, Nesslage GM. 2020. The economic value of research in managing invasive hydrilla in Florida public lakes. Lake Reserv Manage. XX:XX–XX. Decisions on how to allocate research funds can be informed by evaluating the benefits of research, yet past spending is rarely analyzed to gain insights for effective research allocation. We used a case study to evaluate whether research into nonnative invasive plants improved management of herbicide-resistant hydrilla (Hydrilla verticillata) in the Kissimmee Chain of Lakes (KCOL), Florida, USA. We applied a retrospective benefit–cost analysis to quantify the net economic benefits of invasive control informed by government-supported research, relative to a scenario without research funding. Using conservative assumptions, we estimated net benefits of 11 yr of research (1999–2009) and 5 yr of improved hydrilla management as $19.5 million (2017 dollars) with a benefit–cost ratio of 3.8, including avoided ecosystem service losses to angler and nonangler lake users. These benefits were about 2.2 times the annual value of recreational fishing in the KCOL. Sensitivity analysis indicated that positive net benefits were generally robust to uncertainty regarding the hydrilla intrinsic growth rate and treatment costs in the absence of research-informed protocols. We have likely underestimated research benefits because we lumped costs from multiple programs and did not measure benefits accruing to nonusers of lakes. To enable future retrospective economic analyses, we suggest some improvements in record keeping. Our findings of positive net benefits of research may be representative of cases where relatively modest research investment in invasive species control is likely to protect widely appreciated ecosystem services.
{"title":"The economic value of research in managing invasive hydrilla in Florida public lakes","authors":"Matthew A. Weber, L. Wainger, N. Harms, Geneviève M. Nesslage","doi":"10.1080/10402381.2020.1824047","DOIUrl":"https://doi.org/10.1080/10402381.2020.1824047","url":null,"abstract":"Abstract Weber MA, Wainger LA, Harms NE, Nesslage GM. 2020. The economic value of research in managing invasive hydrilla in Florida public lakes. Lake Reserv Manage. XX:XX–XX. Decisions on how to allocate research funds can be informed by evaluating the benefits of research, yet past spending is rarely analyzed to gain insights for effective research allocation. We used a case study to evaluate whether research into nonnative invasive plants improved management of herbicide-resistant hydrilla (Hydrilla verticillata) in the Kissimmee Chain of Lakes (KCOL), Florida, USA. We applied a retrospective benefit–cost analysis to quantify the net economic benefits of invasive control informed by government-supported research, relative to a scenario without research funding. Using conservative assumptions, we estimated net benefits of 11 yr of research (1999–2009) and 5 yr of improved hydrilla management as $19.5 million (2017 dollars) with a benefit–cost ratio of 3.8, including avoided ecosystem service losses to angler and nonangler lake users. These benefits were about 2.2 times the annual value of recreational fishing in the KCOL. Sensitivity analysis indicated that positive net benefits were generally robust to uncertainty regarding the hydrilla intrinsic growth rate and treatment costs in the absence of research-informed protocols. We have likely underestimated research benefits because we lumped costs from multiple programs and did not measure benefits accruing to nonusers of lakes. To enable future retrospective economic analyses, we suggest some improvements in record keeping. Our findings of positive net benefits of research may be representative of cases where relatively modest research investment in invasive species control is likely to protect widely appreciated ecosystem services.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"63 - 76"},"PeriodicalIF":1.5,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1824047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48492182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-07DOI: 10.1080/10402381.2020.1820642
H. Yao, A. Paterson, A. James, C. McConnell, T. Field, R. Ingram, Dejian Zhang, S. Arnott, S. Higgins
Abstract Yao H, Paterson AM, James AL, McConnell C, Field T, Ingram R, Zhang D, Arnott SE, Higgins SN. 2020. Contrasting long-term trends of chloride levels in remote and human-disturbed lakes in south-central Ontrario, Canada. Lake Reserv Manage. XX:XXX–XXX. We examined a 41 yr data record from 4 monitored lakes in south-central Ontario, Canada, to demonstrate and explain long-term changes in chloride (Cl) loading and in-lake concentrations in relation to the degree of watershed disturbance. A mass balance calculation for each lake was used to determine ungauged shoreline loads. Correlations of lake Cl concentrations with each of 3 major contributing sources (inputs from inflowing streams, atmospheric deposition, and ungauged shoreline areas) revealed the contribution of each source to Cl trends at each lake. Areal loads (Cl load per year per unit area) showed the relative intensity of the contributions. Two lakes (Red Chalk, Plastic) with relatively undisturbed watersheds showed declining trends in atmospheric deposition, stream loads, lake export, and lake Cl concentrations, whereas 2 lakes (Harp, Dickie) with disturbed watersheds showed increased stream loads, lake export, and lake concentrations, despite long-term declines in atmospheric deposition. This contrasting trend was related to increased Cl concentrations in inflowing streams, which were caused by increased residential development and road salt applications. The ungauged shoreline loads in the disturbed watersheds made a contribution as high as 80% to total Cl loads. As increasing Cl concentrations have implications for aquatic biota, even at the relatively low concentrations observed in the study lakes, these findings highlight the need for improved management of road salt applications. Our results confirm that even relatively remote lakes within the Canadian Shield are potentially at risk from watershed disturbances that are disrupting the natural loading of Cl to inland waters.
{"title":"Contrasting long-term trends of chloride levels in remote and human-disturbed lakes in south-central Ontario, Canada","authors":"H. Yao, A. Paterson, A. James, C. McConnell, T. Field, R. Ingram, Dejian Zhang, S. Arnott, S. Higgins","doi":"10.1080/10402381.2020.1820642","DOIUrl":"https://doi.org/10.1080/10402381.2020.1820642","url":null,"abstract":"Abstract Yao H, Paterson AM, James AL, McConnell C, Field T, Ingram R, Zhang D, Arnott SE, Higgins SN. 2020. Contrasting long-term trends of chloride levels in remote and human-disturbed lakes in south-central Ontrario, Canada. Lake Reserv Manage. XX:XXX–XXX. We examined a 41 yr data record from 4 monitored lakes in south-central Ontario, Canada, to demonstrate and explain long-term changes in chloride (Cl) loading and in-lake concentrations in relation to the degree of watershed disturbance. A mass balance calculation for each lake was used to determine ungauged shoreline loads. Correlations of lake Cl concentrations with each of 3 major contributing sources (inputs from inflowing streams, atmospheric deposition, and ungauged shoreline areas) revealed the contribution of each source to Cl trends at each lake. Areal loads (Cl load per year per unit area) showed the relative intensity of the contributions. Two lakes (Red Chalk, Plastic) with relatively undisturbed watersheds showed declining trends in atmospheric deposition, stream loads, lake export, and lake Cl concentrations, whereas 2 lakes (Harp, Dickie) with disturbed watersheds showed increased stream loads, lake export, and lake concentrations, despite long-term declines in atmospheric deposition. This contrasting trend was related to increased Cl concentrations in inflowing streams, which were caused by increased residential development and road salt applications. The ungauged shoreline loads in the disturbed watersheds made a contribution as high as 80% to total Cl loads. As increasing Cl concentrations have implications for aquatic biota, even at the relatively low concentrations observed in the study lakes, these findings highlight the need for improved management of road salt applications. Our results confirm that even relatively remote lakes within the Canadian Shield are potentially at risk from watershed disturbances that are disrupting the natural loading of Cl to inland waters.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"19 - 33"},"PeriodicalIF":1.5,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1820642","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46423350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-07DOI: 10.1080/10402381.2020.1814462
M. Sia, R. Doyle, K. Moser
Abstract Sia ME, Doyle RM, Moser KA. 2020. Recent trends in mountain lake primary production: evaluating the response to fish stocking relative to regional environmental stressors. Lake Reserv Manage. XX:XXX–XXX. Although mountain lakes are often remote, they are impacted by a myriad of stressors, including species introductions, atmospheric fertilization, and climate change. These stressors have the potential to increase primary production, which can threaten mountain lakes by decreasing water quality, reducing species richness, and lowering dissolved oxygen concentrations. The relative importance of these stressors as drivers of production is not well understood. We therefore investigated the importance of fish stocking, relative to other stressors, as a driver of primary production in mountain lakes. Our research focused on Uinta Mountain lakes, which, like many lakes in the western United States, were stocked with salmonid fish in the 1950s. In 2 stocked lakes and one unstocked lake, we reconstructed a record of ∼300 yr of primary production from lake sediments using changes in percentage of organic matter and spectrally inferred concentrations of chlorophyll a and its derivatives. With long-term trends in primary production, we determined that all 3 study lakes, including the unstocked lake, show unprecedented increases in primary production beginning in the 1950s. We attribute recent increases in primary production mainly to atmospheric deposition of nitrogen and climate warming, but do not rule out future impacts of fish stocking. Our article demonstrates how breakpoint analysis can be used to identify the most serious threats to mountain lakes, even if those lakes are impacted by multiple stressors or stressors originating from distant places.
{"title":"Recent trends in mountain lake primary production: evaluating the response to fish stocking relative to regional environmental stressors","authors":"M. Sia, R. Doyle, K. Moser","doi":"10.1080/10402381.2020.1814462","DOIUrl":"https://doi.org/10.1080/10402381.2020.1814462","url":null,"abstract":"Abstract Sia ME, Doyle RM, Moser KA. 2020. Recent trends in mountain lake primary production: evaluating the response to fish stocking relative to regional environmental stressors. Lake Reserv Manage. XX:XXX–XXX. Although mountain lakes are often remote, they are impacted by a myriad of stressors, including species introductions, atmospheric fertilization, and climate change. These stressors have the potential to increase primary production, which can threaten mountain lakes by decreasing water quality, reducing species richness, and lowering dissolved oxygen concentrations. The relative importance of these stressors as drivers of production is not well understood. We therefore investigated the importance of fish stocking, relative to other stressors, as a driver of primary production in mountain lakes. Our research focused on Uinta Mountain lakes, which, like many lakes in the western United States, were stocked with salmonid fish in the 1950s. In 2 stocked lakes and one unstocked lake, we reconstructed a record of ∼300 yr of primary production from lake sediments using changes in percentage of organic matter and spectrally inferred concentrations of chlorophyll a and its derivatives. With long-term trends in primary production, we determined that all 3 study lakes, including the unstocked lake, show unprecedented increases in primary production beginning in the 1950s. We attribute recent increases in primary production mainly to atmospheric deposition of nitrogen and climate warming, but do not rule out future impacts of fish stocking. Our article demonstrates how breakpoint analysis can be used to identify the most serious threats to mountain lakes, even if those lakes are impacted by multiple stressors or stressors originating from distant places.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"47 - 62"},"PeriodicalIF":1.5,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1814462","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47850830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.1080/10402381.2020.1843208
M. Thompson, J. Krissansen‐Totton, N. Wogan, J. Fortney
Correction for “The case and context for atmospheric methane as an exoplanet biosignature,” by Maggie A. Thompson, Joshua Krissansen-Totton, Nicholas Wogan, Myriam Telus, and Jonathan J. Fortney, which published March 30, 2022; 10.1073/ pnas.2117933119 (Proc. Natl. Acad. Sci. U.S.A. 119, e2117933119). The authors note that an older version of Fig. 4 was published in error. The corrected figure and its legend appear below. The online version has been corrected. The authors note that on page 5, right column, second full paragraph, line 27, “However, the amount of abiotic methane generated in continental settings is several orders of magnitude smaller than the biogenic flux (78–82).” should instead appear as “Current observations suggest that the largest abiotic CH4 fluxes come from continental settings, and in particular, continental ophiolites (79). Although estimates for the global abiotic CH4 fluxes from such sources are challenging to determine, at present, such fluxes are much smaller than the current biogenic flux (78–83).” The new reference appears below. The online version has been corrected. The authors note that on page 6, right column, first paragraph, line 13, “Another source of uncertainty is what catalysts might be available in natural settings.” should instead appear as “Another source of uncertainty is what catalysts might be available in natural settings. For example, Etiope et al. (89) analyzed gas from various rocks composing ophiolites and determined that chromitites, rocks rich in chromium and ruthenium, were the only rocks to contain significant abiotic methane, suggesting that chromium and ruthenium may be important metal catalysts for abiotic methane production (89).” The new reference appears below. The online version has been corrected. The authors note that, in the SI Appendix, page 6, line 240, “Portella et al. 2019: Their study of serpentinization of chromitites in ophiolites found that chromitites can contain CH4 gas concentrations up to 0.31 μg/grock. Taking this CH4 concentration and multiplying it by Earth’s melt production rate (3.2 × 10 g/s) results in a global CH4 flux estimate of 2 × 10 3 Tmol/year (38).” should instead appear as “Portella et al. 2019: Their study of serpentinization of chromitites in ophiolites found that chromitites can contain CH4 gas concentrations up to 0.31 μg/grock (39). Extrapolating this concentration by Earth's global melt production rate gives a negligible CH4 flux compared to the biogenic flux. However, due to uncertainties in how these gas concentrations vary in time and between different sites and whether such processes could take place on a global scale, we do not include a global abiotic flux extrapolation for this source.” The SI Appendix has been corrected online. The authors note that, in the SI Appendix, page 6, line 245, “They also estimated that the lower oceanic crust contains a total of ∼300 Tmol of CH4 gas (39). Given that the lifetime of the oceanic crust is ∼200 Myrs,
更正《大气甲烷作为系外行星生物特征的案例和背景》，作者:Maggie A. Thompson、Joshua Krissansen-Totton、Nicholas Wogan、Myriam Telus和Jonathan J. Fortney，发表于2022年3月30日;10.1073 / pnas.2117933119(Proc国家的。学会科学。(美)119,e2117933119)。作者指出，图4的旧版本是错误发表的。更正后的数字及其图例如下所示。网上版本已更正。作者注意到，在第5页，右栏，第二完整段，第27行，"然而，在大陆环境中产生的非生物甲烷的数量比生物通量小几个数量级(78-82)。当前的观测表明，最大的非生物CH4通量来自大陆环境，特别是大陆蛇绿岩(79)。尽管对这些来源的全球非生物CH4通量的估计很难确定，但目前，这种通量远小于目前的生物源通量(78-83)。新的参考文献如下所示。网上版本已更正。作者注意到，在第6页，右栏，第一段，第13行，“另一个不确定的来源是在自然环境中可能有什么催化剂。应该写成“另一个不确定的来源是在自然环境中可能有什么催化剂。”例如，Etiope等人(89)分析了由蛇绿岩组成的各种岩石的气体，并确定铬铁矿(富含铬和钌的岩石)是唯一含有大量非生物甲烷的岩石，这表明铬和钌可能是产生非生物甲烷的重要金属催化剂(89)。”新的参考文献如下所示。网上版本已更正。作者指出，在SI附录第6页第240行，“Portella et al. 2019:他们对蛇绿岩中铬铁矿的蛇纹石化研究发现，铬铁矿可含有高达0.31 μg/岩石的CH4气体浓度。将这一CH4浓度乘以地球熔体生成速率(3.2 × 10g /s)，全球CH4通量估计为2 × 103tmol /年(38)。Portella et al. 2019:他们对蛇绿岩中铬铁矿的蛇纹化研究发现，铬铁矿中CH4气体浓度可高达0.31 μg/岩石(39)。根据地球的全球熔体生成速率来推断这一浓度，与生物源通量相比，CH4通量可以忽略不计。然而，由于这些气体浓度如何随时间和不同地点变化以及此类过程是否可能在全球范围内发生的不确定性，我们没有将该来源的全球非生物通量外推纳入其中。”SI附录已在线更正。作者注意到，在SI附录第6页245行，“他们还估计海洋地壳下部总共含有约300 Tmol的CH4气体(39)。考虑到海洋地壳的寿命为~ 200 Myrs，估计由蛇纹石化引起的全球非生物CH4通量为1.5 × 10.6 Tmol/年。他们还估计海底地壳中总共含有约300 Tmol的CH4气体(40)。将海洋地壳下部的甲烷气体量除以地球海洋地壳的寿命，得到的全球非生物CH4通量可以忽略不计。然而，由于将这些发现外推到全球范围的各种不确定性，我们没有将这一来源的全球非生物通量外推纳入其中。”SI附录已在线更正。作者注意到SI附录中的支持表2出现不正确。SI附录已在线更正。
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Pub Date : 2020-09-21DOI: 10.1080/10402381.2020.1809036
Sayena Faridmarandi, Y. Khare, G. Naja
Abstract Faridmarandi S, Khare YP, Naja GM. 2020. Long-term regional nutrient contributions and in-lake water quality trends for Lake Okeechobee. Lake Reserv Manage. XX:XXX–XXX. A long-term dataset was used to investigate the historical regional changes in Lake Okeechobee water quality from water year 1974 to 2018. During this period, the total phosphorus (TP) load from the northern region to the lake remained statistically stable while the in-lake TP concentrations showed a statistically significant increasing trend, despite decades of state plans to restore this ecosystem. During the investigated period of record, the inflow TP flow weighted mean concentration from the southern region had a slightly higher value of 0.191 mg/L (when compared to the northern region) with a statistically significant increasing trend. The average annual total nitrogen unit area inflow loading (678.6 kg/km2) and flow weighted mean concentration (4.35 mg/L) into Lake Okeechobee from the southern region had the highest levels when compared to other regions. Lake Okeechobee TP sedimentation rate showed a statistically significant decreasing trend indicating a reduction in the capacity of the lake sediments to assimilate phosphorus. Results showed that the lake sediments may become a continuous source of phosphorus in water year 2035. Sustained and long-term efforts on the scale of decades will be required for restoring the lake using a multipronged approach consisting of mainly the implementation of nutrient/fertilizer best management practices and the construction of ∼200 km2 of constructed wetlands for a total project cost of US$4.26 billion. Unless a proven cost-effective technology is developed to tackle the legacy TP problem in the lake sediments, a prioritization of state resources is required while focusing on Lake Okeechobee watershed.
{"title":"Long-term regional nutrient contributions and in-lake water quality trends for Lake Okeechobee","authors":"Sayena Faridmarandi, Y. Khare, G. Naja","doi":"10.1080/10402381.2020.1809036","DOIUrl":"https://doi.org/10.1080/10402381.2020.1809036","url":null,"abstract":"Abstract Faridmarandi S, Khare YP, Naja GM. 2020. Long-term regional nutrient contributions and in-lake water quality trends for Lake Okeechobee. Lake Reserv Manage. XX:XXX–XXX. A long-term dataset was used to investigate the historical regional changes in Lake Okeechobee water quality from water year 1974 to 2018. During this period, the total phosphorus (TP) load from the northern region to the lake remained statistically stable while the in-lake TP concentrations showed a statistically significant increasing trend, despite decades of state plans to restore this ecosystem. During the investigated period of record, the inflow TP flow weighted mean concentration from the southern region had a slightly higher value of 0.191 mg/L (when compared to the northern region) with a statistically significant increasing trend. The average annual total nitrogen unit area inflow loading (678.6 kg/km2) and flow weighted mean concentration (4.35 mg/L) into Lake Okeechobee from the southern region had the highest levels when compared to other regions. Lake Okeechobee TP sedimentation rate showed a statistically significant decreasing trend indicating a reduction in the capacity of the lake sediments to assimilate phosphorus. Results showed that the lake sediments may become a continuous source of phosphorus in water year 2035. Sustained and long-term efforts on the scale of decades will be required for restoring the lake using a multipronged approach consisting of mainly the implementation of nutrient/fertilizer best management practices and the construction of ∼200 km2 of constructed wetlands for a total project cost of US$4.26 billion. Unless a proven cost-effective technology is developed to tackle the legacy TP problem in the lake sediments, a prioritization of state resources is required while focusing on Lake Okeechobee watershed.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"77 - 94"},"PeriodicalIF":1.5,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2020.1809036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47973984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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