Pub Date : 2021-10-02DOI: 10.1080/10402381.2021.1989525
E. Smith, D. Balika, A. Kirkwood
Abstract Smith ED, Balika D, Kirkwood AE. 2021. Community science-based monitoring reveals the role of land use scale in driving nearshore water quality in a large, shallow, Canadian lake. Lake Reserv Manage. 37:431–444. As shorelines and watersheds become increasingly developed, lake condition declines due to nutrient enrichment, excess algae growth, and contaminant loading. Lake Scugog, a large shallow lake in southern Ontario, Canada, is no exception, and has been experiencing increased urban development in its agriculture-dominated watershed over the last few decades. By applying a 3-pronged co-production model (stewardship group, watershed authority, and university laboratory), a nearshore water quality monitoring program was implemented using a community-science approach. Nearshore water samples were collected over 3 years (2017–2019) by trained community scientists. We found strong relationships between water quality parameters and land use, at the buffer and subcatchment scale. The strength of the land use relationships varied by parameter and scale, where chloride was significantly predicted by buffer land use, and phosphorus was explained by development at the subcatchment scale. Based on the high rate of participation compliance, the community science approach proved to be effective for capturing spatially explicit water quality data, which allowed us to establish current baseline conditions in Scugog’s nearshore zone. Future watershed management should consider both scales of land use, but prioritize restoration efforts on the scale that corresponds to their specific water quality goals.
{"title":"Community science-based monitoring reveals the role of land use scale in driving nearshore water quality in a large, shallow, Canadian lake","authors":"E. Smith, D. Balika, A. Kirkwood","doi":"10.1080/10402381.2021.1989525","DOIUrl":"https://doi.org/10.1080/10402381.2021.1989525","url":null,"abstract":"Abstract Smith ED, Balika D, Kirkwood AE. 2021. Community science-based monitoring reveals the role of land use scale in driving nearshore water quality in a large, shallow, Canadian lake. Lake Reserv Manage. 37:431–444. As shorelines and watersheds become increasingly developed, lake condition declines due to nutrient enrichment, excess algae growth, and contaminant loading. Lake Scugog, a large shallow lake in southern Ontario, Canada, is no exception, and has been experiencing increased urban development in its agriculture-dominated watershed over the last few decades. By applying a 3-pronged co-production model (stewardship group, watershed authority, and university laboratory), a nearshore water quality monitoring program was implemented using a community-science approach. Nearshore water samples were collected over 3 years (2017–2019) by trained community scientists. We found strong relationships between water quality parameters and land use, at the buffer and subcatchment scale. The strength of the land use relationships varied by parameter and scale, where chloride was significantly predicted by buffer land use, and phosphorus was explained by development at the subcatchment scale. Based on the high rate of participation compliance, the community science approach proved to be effective for capturing spatially explicit water quality data, which allowed us to establish current baseline conditions in Scugog’s nearshore zone. Future watershed management should consider both scales of land use, but prioritize restoration efforts on the scale that corresponds to their specific water quality goals.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"431 - 444"},"PeriodicalIF":1.5,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45563905","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 : 2021-09-20DOI: 10.1080/10402381.2021.1970658
L. Costadone, M. Sytsma, Yangdong D. Pan, M. Rosenkranz
Abstract Costadone L, Sytsma MD, Pan Y, Rosenkranz M. 2021. Effect of management on water quality and perception of ecosystem services provided by an urban lake. Lake Reserv Manage. 37:418–430. Integrating the perception of water quality in management efforts can be an effective way of developing and evaluating management plans targeted at preserving lake ecosystem benefits. We present a case study of Oswego Lake (OR), an urban lake that has been intensively managed for the past 20 yr to preserve valuable esthetic and recreational benefits. We combined the analysis of a long-term water quality dataset with survey data to assess whether management efforts over time successfully met the expectations of people using the lake. The synergistic impact of both in-lake and watershed management activities significantly reduced whole-lake nutrient concentrations; however, high external phosphorus loading from native soil sources and the surrounding urbanized watershed likely continued to contribute to episodes of cyanobacteria blooms during the summer and partially limited in-lake management efforts. Although there was no statistically significant change in mean summer water transparency over the 20 yr management period, more than 60% of the people that have access to the lake thought the water quality had improved since they started using the lake. The lake was also perceived as “suitable” for esthetic and recreational enjoyment by users. As with other lakes in highly developed urban watersheds, Oswego Lake requires ongoing interventions to maintain adequate water quality. Management challenges include coordination of multiple stakeholders and jurisdictions with sometimes conflicting goals and constituencies, maintaining a long-term monitoring program that can produce consistent high-quality data, and keeping in touch with user groups to ensure that lake water quality meets expectations.
[摘要]Costadone L, Sytsma MD, Pan Y, Rosenkranz M. 2021。管理对城市湖泊水质和生态系统服务感知的影响。湖泊保护区管理。[07:418 - 430]在管理工作中融入对水质的认识是制定和评价旨在保护湖泊生态系统利益的管理计划的有效途径。我们以奥斯威戈湖(OR)为例进行了研究，这是一个城市湖泊，在过去的20年里，为了保持有价值的美学和娱乐效益，人们对其进行了集中管理。我们将长期水质数据集的分析与调查数据相结合，以评估长期以来的管理工作是否成功地满足了使用湖泊的人们的期望。湖内管理活动和流域管理活动的协同作用显著降低了全湖营养物质浓度;然而，来自原生土壤来源和周围城市化流域的高外部磷负荷可能继续导致夏季蓝藻爆发，并部分限制了湖内管理工作。虽然在20年的管理期间，夏季平均水透明度没有统计学上的显著变化，但超过60%的可以进入湖泊的人认为，自从他们开始使用湖泊以来，水质有所改善。该湖也被认为“适合”用户的审美和娱乐享受。与其他高度发达的城市流域的湖泊一样，奥斯威戈湖需要持续的干预措施来保持足够的水质。管理方面的挑战包括协调多个利益相关者和司法管辖区，有时目标和选区相互冲突，维持长期监测计划，以产生一致的高质量数据，并与用户群体保持联系，以确保湖泊水质符合预期。
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Pub Date : 2021-08-26DOI: 10.1080/10402381.2021.1879325
Abstract Houser C, Smith A, Lilly J. 2021. Relative importance of recreational boat wakes on an inland lake. Lake Reserv Manage. 37:227–234. Wakes generated by recreational boats have the potential to erode the shoreline, damage infrastructure, or disrupt aquatic ecosystems. Therefore, boat wakes are an increasingly important focus of coastal management, particularly along vulnerable shorelines. This short communication quantifies the relative importance of recreational boat wake energy along the shoreline of an inland cottage lake in Northern Ontario, Canada. Measurements of recreational boat wakes at the end of one of the longest fetches for locally generated wind waves on the lake account for >61% of total wave energy. Based on this result, recreational wake energy likely is the primary source of wave activity along sections of the lake adjacent to the primary sailing lines but not aligned to the primary directions of wind wave energy. Recreational boat wakes may be a significant source of wave energy on other inland lakes.
{"title":"Relative importance of recreational boat wakes on an inland lake","authors":"","doi":"10.1080/10402381.2021.1879325","DOIUrl":"https://doi.org/10.1080/10402381.2021.1879325","url":null,"abstract":"Abstract Houser C, Smith A, Lilly J. 2021. Relative importance of recreational boat wakes on an inland lake. Lake Reserv Manage. 37:227–234. Wakes generated by recreational boats have the potential to erode the shoreline, damage infrastructure, or disrupt aquatic ecosystems. Therefore, boat wakes are an increasingly important focus of coastal management, particularly along vulnerable shorelines. This short communication quantifies the relative importance of recreational boat wake energy along the shoreline of an inland cottage lake in Northern Ontario, Canada. Measurements of recreational boat wakes at the end of one of the longest fetches for locally generated wind waves on the lake account for >61% of total wave energy. Based on this result, recreational wake energy likely is the primary source of wave activity along sections of the lake adjacent to the primary sailing lines but not aligned to the primary directions of wind wave energy. Recreational boat wakes may be a significant source of wave energy on other inland lakes.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"227 - 234"},"PeriodicalIF":1.5,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1879325","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47958741","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 : 2021-08-25DOI: 10.1080/10402381.2021.1961176
W. Hassett, J. Zimmerman, G. Rollwagen‐Bollens, S. Bollens, T. Counihan
Abstract Hassett W, Zimmerman J, Rollwagen-Bollens G, Bollens SM, Counihan TD. 2021. An experimental evaluation of the efficacy of imaging flow cytometry (FlowCam) for detecting invasive Dreissened and Corbiculid bivalve veligers. Lake Reserv Manage. 37:406–417. Zebra (Dreissena polymorpha) and quagga (D. bugensis) mussels, first introduced from central Asia into the Great Lakes of North America in the late 1980s, have crossed the continental divide and more recently spread across western North America. At the same time, several new technologies have been developed for the early detection of dreissenids, including the FlowCam, a digital imaging-in-flow instrument, intended to detect dreissenid planktonic larvae (veligers). However, the efficacy of this technology has rarely been tested. We experimentally evaluated the FlowCam’s ability to capture identifiable images of quagga mussel veligers under 2 different types of conditions: (i) deionized water, and (ii) Columbia River Basin water (CRBW), including natural sediment and native plankton. We further evaluated the FlowCam’s ability to distinguish between dreissenid veligers and corbiculid veligers (Asian clam, Corbicula fluminea). We interpret our results to indicate that the FlowCam can consistently detect dreissenid veligers across a range of veliger densities. Moreover, the presence of other plankton and detritus only slightly affected dreissenid detection by the FlowCam. However, the orientation of individual bivalve veligers as they were imaged by the FlowCam precluded specific identification of a substantial proportion (24.8%) of veligers as either dreissenid or corbiculid. We suggest that the FlowCam is an important detection tool best utilized as part of a multifaceted approach, including traditional microscopy and possibly environmental DNA.
{"title":"An experimental evaluation of the efficacy of imaging flow cytometry (FlowCam) for detecting invasive Dreissened and Corbiculid bivalve veligers","authors":"W. Hassett, J. Zimmerman, G. Rollwagen‐Bollens, S. Bollens, T. Counihan","doi":"10.1080/10402381.2021.1961176","DOIUrl":"https://doi.org/10.1080/10402381.2021.1961176","url":null,"abstract":"Abstract Hassett W, Zimmerman J, Rollwagen-Bollens G, Bollens SM, Counihan TD. 2021. An experimental evaluation of the efficacy of imaging flow cytometry (FlowCam) for detecting invasive Dreissened and Corbiculid bivalve veligers. Lake Reserv Manage. 37:406–417. Zebra (Dreissena polymorpha) and quagga (D. bugensis) mussels, first introduced from central Asia into the Great Lakes of North America in the late 1980s, have crossed the continental divide and more recently spread across western North America. At the same time, several new technologies have been developed for the early detection of dreissenids, including the FlowCam, a digital imaging-in-flow instrument, intended to detect dreissenid planktonic larvae (veligers). However, the efficacy of this technology has rarely been tested. We experimentally evaluated the FlowCam’s ability to capture identifiable images of quagga mussel veligers under 2 different types of conditions: (i) deionized water, and (ii) Columbia River Basin water (CRBW), including natural sediment and native plankton. We further evaluated the FlowCam’s ability to distinguish between dreissenid veligers and corbiculid veligers (Asian clam, Corbicula fluminea). We interpret our results to indicate that the FlowCam can consistently detect dreissenid veligers across a range of veliger densities. Moreover, the presence of other plankton and detritus only slightly affected dreissenid detection by the FlowCam. However, the orientation of individual bivalve veligers as they were imaged by the FlowCam precluded specific identification of a substantial proportion (24.8%) of veligers as either dreissenid or corbiculid. We suggest that the FlowCam is an important detection tool best utilized as part of a multifaceted approach, including traditional microscopy and possibly environmental DNA.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"406 - 417"},"PeriodicalIF":1.5,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48506018","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 : 2021-08-09DOI: 10.1080/10402381.2021.1941447
D. Branstrator, J. Dumke, V. Brady, Holly A. Wellard Kelly
Abstract Branstrator DK, Dumke JD, Brady VJ, Wellard Kelly HA. 2021. Lines snag spines! A field test of recreational angling gear ensnarement of Bythotrephes. Lake Reserv Manage. 37:391–405. Recreational angling gear is a high-risk pathway of dispersal for the invasive spiny water flea (Bythotrephes cederströmii). We measured the number of Bythotrephes individuals ensnared on trolled shallow angling lines (3 line materials), a trolled downrigger angling line, a trolled downrigger steel cable, a trolled simulated livewell, a trolled bait bucket, and stationary anchor ropes (3 rope materials) in 2 Minnesota (United States) lakes. The shallow angling lines and the downrigger angling line had the greatest mean ensnarement rates (number of Bythotrephes individuals ensnared/transect transit), followed by the downrigger cable and the livewell, followed by the bait bucket and the anchor ropes. Added together, the shallow angling lines (as a mean of the 3 line materials) and the downrigger angling line accounted for 87–88% of the mean total ensnarement rate. Among the shallow angling lines, monofilament and fluorocarbon lines had greater mean ensnarement rates than braided line but the distinction was only statistically significant in one of the 2 lakes. The ensnarement rate of all angling gear combined was positively related to the density of Bythotrephes in the water column at the time of study (ambient density). On the downrigger angling line (monofilament), instar-3 Bythotrephes were ensnared at a relative frequency disproportionately greater than ambient density would predict, while instar-1 Bythotrephes were ensnared at a relative frequency disproportionately less than ambient density would predict. Our results suggest that education and outreach messaging should include instructions on removing Bythotrephes from angling lines in addition to the reminder to drain all water.
摘要：Branstrator DK，Dumke JD，Brady VJ，Wellard Kelly HA。2021。线钩住脊椎！一项野外试验的休闲钓鱼设备诱捕的Bythotrephs。湖泊保护区管理。37:391–405.休闲钓鱼装备是入侵刺水蚤（Bythotrephs cederströmii）传播的高风险途径。我们测量了被困在控制的浅钓鱼线上的Bythotrephs个体的数量（3 在明尼苏达州（美国）的两个湖泊中，绳索材料）、受控下索具钓鱼线、受控下吊索钢索、受控模拟活井、受控诱饵桶和固定锚绳（3种绳索材料）。浅钓鱼线和下索钓鱼线的平均诱捕率最高（被诱捕/横断面运输的Bythotrephs个体数量），其次是下索缆和活井，其次是诱饵桶和锚索。加在一起，浅倾斜线（作为3 线材料）和下索具倾斜线占平均总诱捕率的87–88%。在浅钓鱼线中，单丝和氟碳线的平均诱捕率高于编织线，但这一差异仅在两个湖泊中的一个湖泊中具有统计学意义。所有斜齿轮组合的诱捕率与研究时水柱中Bythotrephs的密度（环境密度）呈正相关。在下索具倾斜线（单丝）上，3龄Bythotrephs被诱捕的相对频率不成比例地高于环境密度预测的相对频率，而1龄BythoTrephs被捕捉的相对频率则不成比例地低于环境密度预测。我们的研究结果表明，除了提醒排水外，教育和外联信息还应包括关于将Bythotrephes从钓鱼线上移除的说明。
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Pub Date : 2021-07-20DOI: 10.1080/10402381.2021.1940397
B. Fuhrmann, M. Beutel, P. Ganguli, Liying Zhao, Sarah Brower, Andrew Funk, J. Pasek
Abstract Fuhrmann B, Beutel M, Ganguli P, Zhao L, Brower S, Funk A, Pasek J. 2021. Seasonal patterns of methylmercury production, release, and degradation in profundal sediment of a hypereutrophic reservoir. Lake Reserv Manage. 37:360–377. Profundal lake sediment is an important site of toxic methylmercury (MeHg) production by anaerobic bacteria. This study tracked sediment MeHg cycling in hypereutrophic Hodges Reservoir, in the United States. Sediment-associated MeHg was most elevated in the early spring during moderately reduced conditions. In the late spring, MeHg and iron were released into hypolimnetic water during the progression from iron-reducing to sulfate-reducing conditions at the sediment–water interface. A decrease in porewater sulfate in the early summer indicated enhanced sulfate-reducing bacteria (SRB) activity and was associated with sediment buildup of MeHg, likely due to enhanced sorption to iron sulfides. Depletion of sulfate in the sediment during the fall corresponded with a substantial decrease in both sediment and water-column MeHg, suggesting that methanogenic conditions led to enhanced MeHg degradation. Shortly afterward, MeHg increased in the hypolimnion, indicating an upward shift in the zone of SRB methylation. Our study suggests 2 “hot moments” of MeHg entry into the water column, where it is susceptible to uptake into the pelagic food web: a spring window of mildly reduced conditions that promote MeHg release from sediment, and a fall window where MeHg is produced in the upper hypolimnion. These hot moments may potentially be managed to lower mercury bioaccumulation via redox enhancement of the profundal zone with approaches such as bottom water oxygenation, which began operation in Hodges Reservoir in 2020. However, the complexity of biogeochemical responses to such management perturbations in regard to MeHg cycling makes it difficult to predict the ultimate effect of oxygenation on mercury bioaccumulation. Supplemental data for this article is available online at https://doi.org/10.1080/10402381.2021.1940397 .
Fuhrmann B, Beutel M, Ganguli P, Zhao L, Brower S, Funk A, Pasek J. 2021。超富营养化水库深层沉积物中甲基汞产生、释放和降解的季节模式湖泊保护区管理。37:36 - 377。深层湖泊沉积物是厌氧细菌产生有毒甲基汞(MeHg)的重要场所。本研究追踪了美国富营养化霍奇斯水库沉积物中甲基汞的循环。与沉积物相关的甲基汞在初春适度减少的条件下升高最多。春末，在沉积物-水界面由铁还原向硫酸盐还原的过程中，MeHg和铁被释放到低代谢水体中。初夏孔隙水中硫酸盐的减少表明硫酸盐还原细菌(SRB)活性增强，并与甲基汞的沉积有关，可能是由于对硫化铁的吸附增强。秋季沉积物中硫酸盐的消耗与沉积物和水柱中MeHg的大幅减少相对应，表明产甲烷条件导致MeHg降解增强。不久之后，甲基汞在低磷离子中升高，表明SRB甲基化区向上移动。我们的研究表明，MeHg进入水柱的两个“热时刻”很容易被吸收到远洋食物网中:一个春季窗口，轻度减少的条件促进了MeHg从沉积物中释放，一个秋季窗口，MeHg在上层低铵离子中产生。这些热时刻可能会通过底层水氧化等方法通过深层区氧化还原增强来降低汞的生物积累，这些方法于2020年开始在霍奇斯水库运行。然而，生物地球化学对MeHg循环管理扰动的响应的复杂性使得很难预测氧化对汞生物积累的最终影响。本文的补充数据可在https://doi.org/10.1080/10402381.2021.1940397上在线获得。
{"title":"Seasonal patterns of methylmercury production, release, and degradation in profundal sediment of a hypereutrophic reservoir","authors":"B. Fuhrmann, M. Beutel, P. Ganguli, Liying Zhao, Sarah Brower, Andrew Funk, J. Pasek","doi":"10.1080/10402381.2021.1940397","DOIUrl":"https://doi.org/10.1080/10402381.2021.1940397","url":null,"abstract":"Abstract Fuhrmann B, Beutel M, Ganguli P, Zhao L, Brower S, Funk A, Pasek J. 2021. Seasonal patterns of methylmercury production, release, and degradation in profundal sediment of a hypereutrophic reservoir. Lake Reserv Manage. 37:360–377. Profundal lake sediment is an important site of toxic methylmercury (MeHg) production by anaerobic bacteria. This study tracked sediment MeHg cycling in hypereutrophic Hodges Reservoir, in the United States. Sediment-associated MeHg was most elevated in the early spring during moderately reduced conditions. In the late spring, MeHg and iron were released into hypolimnetic water during the progression from iron-reducing to sulfate-reducing conditions at the sediment–water interface. A decrease in porewater sulfate in the early summer indicated enhanced sulfate-reducing bacteria (SRB) activity and was associated with sediment buildup of MeHg, likely due to enhanced sorption to iron sulfides. Depletion of sulfate in the sediment during the fall corresponded with a substantial decrease in both sediment and water-column MeHg, suggesting that methanogenic conditions led to enhanced MeHg degradation. Shortly afterward, MeHg increased in the hypolimnion, indicating an upward shift in the zone of SRB methylation. Our study suggests 2 “hot moments” of MeHg entry into the water column, where it is susceptible to uptake into the pelagic food web: a spring window of mildly reduced conditions that promote MeHg release from sediment, and a fall window where MeHg is produced in the upper hypolimnion. These hot moments may potentially be managed to lower mercury bioaccumulation via redox enhancement of the profundal zone with approaches such as bottom water oxygenation, which began operation in Hodges Reservoir in 2020. However, the complexity of biogeochemical responses to such management perturbations in regard to MeHg cycling makes it difficult to predict the ultimate effect of oxygenation on mercury bioaccumulation. Supplemental data for this article is available online at https://doi.org/10.1080/10402381.2021.1940397 .","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"360 - 377"},"PeriodicalIF":1.5,"publicationDate":"2021-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1940397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45116020","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 : 2021-07-20DOI: 10.1080/10402381.2021.1941446
H. E. McGuire, D. Dunnington, Amanda L. Loder, I. Spooner, M. Mallory, N. McLellan, C. Su
Abstract McGuire HE, Dunnington DW, Loder AL, Spooner IS, Mallory ML, McLellan NR, Su, C-C. 2021. Evaluating the multidecadal response of historic seawater incursion events and salinity-induced meromixis at Laytons Lake, Nova Scotia, Canada. Lake Reserv Manage. 37:378–390. Long-term monitoring data from freshwater lakes can be challenging to retrieve yet are valuable for assessing lakes at risk of saltwater intrusion. We demonstrate the use of an applied paleolimnological method to identify the response of a freshwater lake to seawater incursion and salinity-induced meromixis by examining the geochemistry of lake sediments deposited over the past century. Laytons Lake is located 1.5 km from the Bay of Fundy coastline, and experienced documented seawater incursion events in 1944 and 1949 leading to a period of extended meromixis (>40 yr). Our limnological measurements indicate that meromixis no longer exists at Laytons Lake, and hypolimnetic phosphorus (P) concentrations and conductivity values have declined since 1982. Meromictic conditions, the establishment of the chemocline, and high sedimentation rates collectively preserve a geochemical record of seawater incursion, which was identified as a short-duration, positive chloride (Cl-) excursion followed by the precipitation of iron sulfide (FeS2). A decline in Cl- concentration after the incursion events in the paleorecord may represent the deterioration of the chemocline, and the reestablishment of thermal stratification and mixing. We suspect that seawater incursions can have a multidecadal impact on aquatic systems, and that bulk geochemical analysis of paleolimnological records is a useful, low-cost tool that can provide a long-term perspective on the limnological consequences of such events. These long-term data can inform the assessment of aquatic systems at risk of saltwater incursion due to sea-level rise.
{"title":"Evaluating the multidecadal response of historic seawater incursion events and salinity-induced meromixis at Laytons Lake, Nova Scotia, Canada","authors":"H. E. McGuire, D. Dunnington, Amanda L. Loder, I. Spooner, M. Mallory, N. McLellan, C. Su","doi":"10.1080/10402381.2021.1941446","DOIUrl":"https://doi.org/10.1080/10402381.2021.1941446","url":null,"abstract":"Abstract McGuire HE, Dunnington DW, Loder AL, Spooner IS, Mallory ML, McLellan NR, Su, C-C. 2021. Evaluating the multidecadal response of historic seawater incursion events and salinity-induced meromixis at Laytons Lake, Nova Scotia, Canada. Lake Reserv Manage. 37:378–390. Long-term monitoring data from freshwater lakes can be challenging to retrieve yet are valuable for assessing lakes at risk of saltwater intrusion. We demonstrate the use of an applied paleolimnological method to identify the response of a freshwater lake to seawater incursion and salinity-induced meromixis by examining the geochemistry of lake sediments deposited over the past century. Laytons Lake is located 1.5 km from the Bay of Fundy coastline, and experienced documented seawater incursion events in 1944 and 1949 leading to a period of extended meromixis (>40 yr). Our limnological measurements indicate that meromixis no longer exists at Laytons Lake, and hypolimnetic phosphorus (P) concentrations and conductivity values have declined since 1982. Meromictic conditions, the establishment of the chemocline, and high sedimentation rates collectively preserve a geochemical record of seawater incursion, which was identified as a short-duration, positive chloride (Cl-) excursion followed by the precipitation of iron sulfide (FeS2). A decline in Cl- concentration after the incursion events in the paleorecord may represent the deterioration of the chemocline, and the reestablishment of thermal stratification and mixing. We suspect that seawater incursions can have a multidecadal impact on aquatic systems, and that bulk geochemical analysis of paleolimnological records is a useful, low-cost tool that can provide a long-term perspective on the limnological consequences of such events. These long-term data can inform the assessment of aquatic systems at risk of saltwater incursion due to sea-level rise.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"378 - 390"},"PeriodicalIF":1.5,"publicationDate":"2021-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1941446","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44883921","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 : 2021-06-22DOI: 10.1080/10402381.2021.1927268
Jason R. Carmignani, A. Roy, J. T. Stolarski, T. Richards
Abstract Carmignani JR, Roy AH, Stolarski JT, Richards T. 2021. Hydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States. Lake Reserv Manage. 37:339–359. Annual winter water level drawdown (WD) is a common lake management strategy to maintain recreational value by controlling nuisance macrophytes and preventing ice damage to shoreline infrastructure in lakes of the northeastern United States. The state of Massachusetts provides general guidelines for lake managers to implement and practice WDs. However, WD management reporting is not required and as such empirical water level records are scarce, making it difficult to assess guideline adherence and link these management actions to littoral habitat conditions. We monitored water levels bihourly in 18 lakes with ongoing WD regimes and 3 non-drawdown lakes over 3–4 yr. Our results show an interlake drawdown magnitude gradient of 0.07–2.66 m with intralake consistency across years. Corresponding WD magnitudes generated exposure of 1.3–37.6% for entire lakebeds and 9.2–71.1% for littoral zones. WD durations averaged 171 d and ranged widely from 5 to 246 d. Longer recession and refill phase durations and faster recession rates were moderately to strongly correlated with drawdown magnitudes. WDs were predominantly initiated prior to the state of Massachusetts 1 November starting guideline (83.1%) and refilled to summer reference levels after the recommended date of 1 April (70.6%). To minimize ecological impacts while still meeting recreational goals, WD performance guidelines may require a more fine-scale approach that integrates local hydrogeomorphic features and the presence of WD-sensitive littoral biotic assemblages. However, climate change model projections of warmer and wetter winters in the Northeast indicate increasing uncertainty for WD as an effective and worthwhile macrophyte control tool.
{"title":"Hydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States","authors":"Jason R. Carmignani, A. Roy, J. T. Stolarski, T. Richards","doi":"10.1080/10402381.2021.1927268","DOIUrl":"https://doi.org/10.1080/10402381.2021.1927268","url":null,"abstract":"Abstract Carmignani JR, Roy AH, Stolarski JT, Richards T. 2021. Hydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States. Lake Reserv Manage. 37:339–359. Annual winter water level drawdown (WD) is a common lake management strategy to maintain recreational value by controlling nuisance macrophytes and preventing ice damage to shoreline infrastructure in lakes of the northeastern United States. The state of Massachusetts provides general guidelines for lake managers to implement and practice WDs. However, WD management reporting is not required and as such empirical water level records are scarce, making it difficult to assess guideline adherence and link these management actions to littoral habitat conditions. We monitored water levels bihourly in 18 lakes with ongoing WD regimes and 3 non-drawdown lakes over 3–4 yr. Our results show an interlake drawdown magnitude gradient of 0.07–2.66 m with intralake consistency across years. Corresponding WD magnitudes generated exposure of 1.3–37.6% for entire lakebeds and 9.2–71.1% for littoral zones. WD durations averaged 171 d and ranged widely from 5 to 246 d. Longer recession and refill phase durations and faster recession rates were moderately to strongly correlated with drawdown magnitudes. WDs were predominantly initiated prior to the state of Massachusetts 1 November starting guideline (83.1%) and refilled to summer reference levels after the recommended date of 1 April (70.6%). To minimize ecological impacts while still meeting recreational goals, WD performance guidelines may require a more fine-scale approach that integrates local hydrogeomorphic features and the presence of WD-sensitive littoral biotic assemblages. However, climate change model projections of warmer and wetter winters in the Northeast indicate increasing uncertainty for WD as an effective and worthwhile macrophyte control tool.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"339 - 359"},"PeriodicalIF":1.5,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1927268","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41701011","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 : 2021-06-11DOI: 10.1080/10402381.2021.1923590
Sarah H. Burnet, F. Wilhelm
Abstract Burnet SH, Wilhelm FM. 2021. Estimates of internal loading of phosphorus in a western US reservoir using 3 methods. Lake Reserv Manage. 37:261–274. We used 3 methods to estimate internal loading of total and dissolved phosphorus (TP/DP) in 2 years in a stratified eutrophic western US reservoir with high internal loading of phosphorus. We calculated the internal load from (i) net increases of TP/DP from reservoir water column samples, (ii) gross TP mass balances, and (iii) gross TP/DP loading estimated from laboratory-incubated sediment cores and the anoxic reservoir area. We also present a cost comparison and spreadsheet to allow managers to estimate costs for each method. The highest internal loads were estimated in 2015 from the net in situ samples (999 mg/m2/yr) and the gross annual mass balance (850 mg/m2/yr). Gross estimates from sediment cores were 1.2× higher in 2015 than in 2014 due to differences in anoxic area resulting from a drought and record reservoir drawdown. Costs were highest for the mass balance method and lowest for the sediment core method. Given the small monetary difference between the sediment core and in situ methods, we suggest managers obtain in situ data to estimate internal loading because this yields a net estimate most reflective of whole-lake dynamics. Our data provide an important benchmark of internal loading in a human-made reservoir given the general paucity of such estimates in this large geographic region.
{"title":"Estimates of internal loading of phosphorus in a western US reservoir using 3 methods","authors":"Sarah H. Burnet, F. Wilhelm","doi":"10.1080/10402381.2021.1923590","DOIUrl":"https://doi.org/10.1080/10402381.2021.1923590","url":null,"abstract":"Abstract Burnet SH, Wilhelm FM. 2021. Estimates of internal loading of phosphorus in a western US reservoir using 3 methods. Lake Reserv Manage. 37:261–274. We used 3 methods to estimate internal loading of total and dissolved phosphorus (TP/DP) in 2 years in a stratified eutrophic western US reservoir with high internal loading of phosphorus. We calculated the internal load from (i) net increases of TP/DP from reservoir water column samples, (ii) gross TP mass balances, and (iii) gross TP/DP loading estimated from laboratory-incubated sediment cores and the anoxic reservoir area. We also present a cost comparison and spreadsheet to allow managers to estimate costs for each method. The highest internal loads were estimated in 2015 from the net in situ samples (999 mg/m2/yr) and the gross annual mass balance (850 mg/m2/yr). Gross estimates from sediment cores were 1.2× higher in 2015 than in 2014 due to differences in anoxic area resulting from a drought and record reservoir drawdown. Costs were highest for the mass balance method and lowest for the sediment core method. Given the small monetary difference between the sediment core and in situ methods, we suggest managers obtain in situ data to estimate internal loading because this yields a net estimate most reflective of whole-lake dynamics. Our data provide an important benchmark of internal loading in a human-made reservoir given the general paucity of such estimates in this large geographic region.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"261 - 274"},"PeriodicalIF":1.5,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1923590","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45124751","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 : 2021-05-28DOI: 10.1080/10402381.2021.1920071
Rachel A. Vanausdall, S. Dinsmore
Abstract Vanausdall RA, Dinsmore SJ. 2021. Stopover ecology of the least sandpiper (Calidris minutilla) in Iowa: implications for reservoir management. Lake Reserv Manage. 37:300–312. Multipurpose reservoirs can be used to manage habitat for shorebirds during migration, an energetically costly event that may influence demographics and population numbers. This is particularly true for shorebirds that migrate through the interior of the United States, which has lost much of its wetland habitat. Shorebirds use aquatic systems during stopover periods throughout migration to rest and refuel. Understanding the factors that influence the probability of a shorebird remaining at a stopover area can inform decisions regarding reservoir management. We examined the influence of habitat and environmental covariates and body condition on the daily local residency probability of migrant least sandpipers (Calidris minutilla) at Saylorville Lake, a reservoir in central Iowa. We monitored 189 least sandpipers in fall 2016, 2017, 2019, and 2020 using radiotelemetry. Using a nest survival model, our most competitive model included significant negative effects of water level (β = −8.35, 85% CI = −11.18, −5.52) and body condition (β = −4.91, 85% CI = −6.82, −3.01) on residency probability. We calculated a mean daily local residency probability of 0.78 (95% CI 0.56, 1.00) and used this value to calculate a minimum stopover duration of 3.96 d (95% CI = 3.45, 4.46). Our findings indicate that the timing of water level management at Saylorville Lake can impact the residency probability of the least sandpiper. Drawing down water levels just prior to fall migration and maintaining water levels at or below the conservation pool level (254.8 m) can provide habitat for this species and likely other shorebirds.
{"title":"Stopover ecology of the least sandpiper (Calidris minutilla) in Iowa: implications for reservoir management","authors":"Rachel A. Vanausdall, S. Dinsmore","doi":"10.1080/10402381.2021.1920071","DOIUrl":"https://doi.org/10.1080/10402381.2021.1920071","url":null,"abstract":"Abstract Vanausdall RA, Dinsmore SJ. 2021. Stopover ecology of the least sandpiper (Calidris minutilla) in Iowa: implications for reservoir management. Lake Reserv Manage. 37:300–312. Multipurpose reservoirs can be used to manage habitat for shorebirds during migration, an energetically costly event that may influence demographics and population numbers. This is particularly true for shorebirds that migrate through the interior of the United States, which has lost much of its wetland habitat. Shorebirds use aquatic systems during stopover periods throughout migration to rest and refuel. Understanding the factors that influence the probability of a shorebird remaining at a stopover area can inform decisions regarding reservoir management. We examined the influence of habitat and environmental covariates and body condition on the daily local residency probability of migrant least sandpipers (Calidris minutilla) at Saylorville Lake, a reservoir in central Iowa. We monitored 189 least sandpipers in fall 2016, 2017, 2019, and 2020 using radiotelemetry. Using a nest survival model, our most competitive model included significant negative effects of water level (β = −8.35, 85% CI = −11.18, −5.52) and body condition (β = −4.91, 85% CI = −6.82, −3.01) on residency probability. We calculated a mean daily local residency probability of 0.78 (95% CI 0.56, 1.00) and used this value to calculate a minimum stopover duration of 3.96 d (95% CI = 3.45, 4.46). Our findings indicate that the timing of water level management at Saylorville Lake can impact the residency probability of the least sandpiper. Drawing down water levels just prior to fall migration and maintaining water levels at or below the conservation pool level (254.8 m) can provide habitat for this species and likely other shorebirds.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"37 1","pages":"300 - 312"},"PeriodicalIF":1.5,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10402381.2021.1920071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44033662","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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