Pub Date : 2025-12-01Epub Date: 2025-09-16DOI: 10.1016/j.jglr.2025.102666
Morgan L. Piczak , Cosette Arseneault-Deraps , Ali Shakoor , Gadfly Stratton , Jérôme Marty , Christine L. Madliger , Andrea E. Kirkwood
Achieving Diversity, Equity, Inclusion, and Accessibility (DEIA) in the aquatic sciences has been a chronic challenge, and while recent progress has been made, shifting political and institutional landscapes increasingly jeopardize these crucial efforts. To highlight strategies on how to continue to support DEIA initiatives, the Society of Canadian Aquatic Sciences and the International Association for Great Lakes Research co-hosted a webinar with diverse panelists entitled Making Aquatic Science Spaces More Equitable, Diverse, Inclusive & Accessible: A Panel Discussion. Building on the webinar, we synthesize eight actions individuals in aquatic sciences can take to uphold DEIA values and dismantle barriers: (1) make safety front of mind; (2) embrace complexity and intersectionality; (3) be proactively compassionate and inclusive; (4) identify and remove barriers; (5) engage non-scientific audiences in outreach and public dialogue; (6) be ready to make mistakes and learn from them; (7) be prepared to challenge misinformation; and (8) keep dialogue open about DEIA realities. We have also included narratives which highlight lived experiences of the panelists and how these actions have been implemented in the real world. In the face of growing political and institutional challenges, advancing DEIA in aquatic sciences will increasingly rely on grassroots action, sustained by individual commitment to building a more inclusive and just community.
{"title":"Making aquatic sciences more Diverse, Equitable, Inclusive, and Accessible: Perspectives on how individuals can take action in their professional practice","authors":"Morgan L. Piczak , Cosette Arseneault-Deraps , Ali Shakoor , Gadfly Stratton , Jérôme Marty , Christine L. Madliger , Andrea E. Kirkwood","doi":"10.1016/j.jglr.2025.102666","DOIUrl":"10.1016/j.jglr.2025.102666","url":null,"abstract":"<div><div>Achieving Diversity, Equity, Inclusion, and Accessibility (DEIA) in the aquatic sciences has been a chronic challenge, and while recent progress has been made, shifting political and institutional landscapes increasingly jeopardize these crucial efforts. To highlight strategies on how to continue to support DEIA initiatives, the Society of Canadian Aquatic Sciences and the International Association for Great Lakes Research co-hosted a webinar with diverse panelists entitled Making Aquatic Science Spaces More Equitable, Diverse, Inclusive & Accessible: A Panel Discussion. Building on the webinar, we synthesize eight actions individuals in aquatic sciences can take to uphold DEIA values and dismantle barriers: (1) make safety front of mind; (2) embrace complexity and intersectionality; (3) be proactively compassionate and inclusive; (4) identify and remove barriers; (5) engage non-scientific audiences in outreach and public dialogue; (6) be ready to make mistakes and learn from them; (7) be prepared to challenge misinformation; and (8) keep dialogue open about DEIA realities. We have also included narratives which highlight lived experiences of the panelists and how these actions have been implemented in the real world. In the face of growing political and institutional challenges, advancing DEIA in aquatic sciences will increasingly rely on grassroots action, sustained by individual commitment to building a more inclusive and just community.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102666"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-09-29DOI: 10.1016/j.jglr.2025.102686
Dennis Otieno , Job Mwamburi , Lewis Sitoki , Reuben Omondi , Anakalo Shitandi , Bethwell Owuor , George Bullerjahn , Kefa Otiso , R. Michael McKay , Ken Drouillard , NSF-IRES Lake Victoria Research Consortium
Net pen-reared Nile tilapia (Oreochromis niloticus) and samples of fish food provisioned to fish cages were collected from two aquaculture facilities operated in Winam Gulf, Lake Victoria, and another open lake site on Lake Victoria, Kenya. Samples of fish food and net pen-reared fish were analyzed for stable isotopes and total mercury (THg) concentrations. Values of δ13C in net-pen fish were 9.4–12.7 ‰ higher compared to values in provisioned food. Values of δ15N in fish were 5.36–5.66 ‰ above those measured in the provisioned food at two fish cage facilities in Winam Gulf but not significantly different from one another at the open lake facility. Stable isotopes and THg in aquaculture fish from Winam Gulf were compared against wild-caught lower food web samples from the same region. Residues of THg and δ15N in net-pen fish were similar to wild conspecifics from Winam Gulf. Values of δ13C tended to be elevated in net pen-reared fish compared to wild conspecifics but found to be within the range of δ13C values measured in lower trophic level freshwater shrimp (Caridina niloticus) collected from diverse locations throughout Winam Gulf. Overall, isotope signatures of net pen-reared fish and food provisioned to cages were dissimilar, whereas stable isotope signatures and THg in net-pen fish resembled patterns observed in wild-caught Nile tilapia and other lower food web items from Winam Gulf. The results imply net pen-reared fish are not benefiting from food provisioning and that aquaculture operators could realize economic benefits and lower their environmental impacts by reducing food provisioning rates.
{"title":"Locally produced fish food pellets yield little evidence as a dietary substrate for net pen-reared Nile tilapia (Oreochromis niloticus) in Lake Victoria, Kenya","authors":"Dennis Otieno , Job Mwamburi , Lewis Sitoki , Reuben Omondi , Anakalo Shitandi , Bethwell Owuor , George Bullerjahn , Kefa Otiso , R. Michael McKay , Ken Drouillard , NSF-IRES Lake Victoria Research Consortium","doi":"10.1016/j.jglr.2025.102686","DOIUrl":"10.1016/j.jglr.2025.102686","url":null,"abstract":"<div><div>Net pen-reared Nile tilapia (<em>Oreochromis niloticus</em>) and samples of fish food provisioned to fish cages were collected from two aquaculture facilities operated in Winam Gulf, Lake Victoria, and another open lake site on Lake Victoria, Kenya. Samples of fish food and net pen-reared fish were analyzed for stable isotopes and total mercury (THg) concentrations. Values of δ<sup>13</sup>C in net-pen fish were 9.4–12.7 ‰ higher compared to values in provisioned food. Values of δ<sup>15</sup>N in fish were 5.36–5.66 ‰ above those measured in the provisioned food at two fish cage facilities in Winam Gulf but not significantly different from one another at the open lake facility. Stable isotopes and THg in aquaculture fish from Winam Gulf were compared against wild-caught lower food web samples from the same region. Residues of THg and δ<sup>15</sup>N in net-pen fish were similar to wild conspecifics from Winam Gulf. Values of δ<sup>13</sup>C tended to be elevated in net pen-reared fish compared to wild conspecifics but found to be within the range of δ<sup>13</sup>C values measured in lower trophic level freshwater shrimp (<em>Caridina niloticus</em>) collected from diverse locations throughout Winam Gulf. Overall, isotope signatures of net pen-reared fish and food provisioned to cages were dissimilar, whereas stable isotope signatures and THg in net-pen fish resembled patterns observed in wild-caught Nile tilapia and other lower food web items from Winam Gulf. The results imply net pen-reared fish are not benefiting from food provisioning and that aquaculture operators could realize economic benefits and lower their environmental impacts by reducing food provisioning rates.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102686"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2024-07-31DOI: 10.1016/j.jglr.2024.102403
Timothy J. Calappi , Jonathan M. Waddell , Matthew A. McClerren , Andrew D. Gronewold , Jesse E. McNinch , James P. Selegean
The Great Lakes contain 20 percent of the world’s fresh surface water, a drinking source for 30- million people. The system is vital to manufacturing, largely due to efficient transportation of commodities and an abundance of natural resources. Understanding the water balance and predicting future water levels is important for many industries including commercial navigation, the tourist industry, hydropower and shoreline property owners, just to name a few. These predictions require an understanding of both the hydroclimate drivers across the Great Lakes as well as physical changes in the connecting channels that pass water between each lake. Since the International Upper Great Lakes Study began, the St. Clair River has been the topic of conveyance change investigations. This study tests the sensitivity of water surface elevations to small differences in bathymetric changes. Greater than 80 percent of the surveyed points had less than 0.24 m of change between any combination of survey years. Repeat bathymetric surveys collected in 2007, 2012 and 2021, along with hydrodynamic modeling, find changes in water surface elevations associated with bathymetric change are on the sub-centimeter scale. These changes are put into perspective and compared to known anthropogenic and naturally occurring conveyance changes. While these surveys represent a short duration in the observed water level record of the Great Lakes, they represent an important documentation of the geomorphic state of the St. Clair River. These changes can and should be compared to similar future surveys of the river over longer engineering and geomorphic timescales.
{"title":"Evaluation of repeat bathymetric surveys on water surface elevations on the Saint Clair River","authors":"Timothy J. Calappi , Jonathan M. Waddell , Matthew A. McClerren , Andrew D. Gronewold , Jesse E. McNinch , James P. Selegean","doi":"10.1016/j.jglr.2024.102403","DOIUrl":"10.1016/j.jglr.2024.102403","url":null,"abstract":"<div><div>The Great Lakes contain 20 percent of the world’s fresh surface water, a drinking source for 30- million people. The system is vital to manufacturing, largely due to efficient transportation of commodities and an abundance of natural resources. Understanding the water balance and predicting future water levels is important for many industries including commercial navigation, the tourist industry, hydropower and shoreline property owners, just to name a few. These predictions require an understanding of both the hydroclimate drivers across the Great Lakes as well as physical changes in the connecting channels that pass water between each lake. Since the International Upper Great Lakes Study began, the St. Clair River has been the topic of conveyance change investigations. This study tests the sensitivity of water surface elevations to small differences in bathymetric changes. Greater than 80 percent of the surveyed points had less than 0.24 m of change between any combination of survey years. Repeat bathymetric surveys collected in 2007, 2012 and 2021, along with hydrodynamic modeling, find changes in water surface elevations associated with bathymetric change are on the sub-centimeter scale. These changes are put into perspective and compared to known anthropogenic and naturally occurring conveyance changes. While these surveys represent a short duration in the observed water level record of the Great Lakes, they represent an important documentation of the geomorphic state of the St. Clair River. These changes can and should be compared to similar future surveys of the river over longer engineering and geomorphic timescales.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102403"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-11-12DOI: 10.1016/j.jglr.2025.102701
Donald Scavia , Timothy J. Calappi
The Great Lakes Water Quality Agreement established the western and central basin of Lake Erie total phosphorus (TP) target of 6000 metric tons per year. Models that develop load-response curves showed that daily loads and annual loads of the Detroit River are important. Direct measurements near the river mouth are difficult due to Lake Erie seiches and surface oscillations. Therefore, an alternative approach for estimating daily loads is needed. We show that existing turbidity-TP relationships can be applied to water treatment plant (WTP) turbidity to develop daily load estimates by those responsible for routine monitoring. We show how turbidity measured at WTP are comparable to those measured in the river. WTP uses an existing infrastructure that is of high temporal resolution, so agencies charged with determining loads may use this network. By using daily water flux and the WTP-based observations, daily TP concentration estimates and loads are applied upstream near Belle Isle and downstream near Fighting Island. By adding the respective loads to the river, we obtain daily TP flux estimates to Lake Erie. Due to well known turbidity gradients, the Windsor WTP needs an adjustment to better reflect turbidity in the entire river. After adjusting, the summed daily rates to Lake Erie from both stations are comparable each other and to other rates. We also show the 2019–2024 annual averages are approximately 15 % greater than that estimated by the Environmental Protection Agency (EPA) and Environment and Climate Change Canada (ECCC). These daily and annual load estimates can be useful augmentations of more traditional monitoring efforts that provide only annual loads.
{"title":"Daily Detroit river total phosphorus loads to Lake Erie from water treatment plant turbidity","authors":"Donald Scavia , Timothy J. Calappi","doi":"10.1016/j.jglr.2025.102701","DOIUrl":"10.1016/j.jglr.2025.102701","url":null,"abstract":"<div><div>The Great Lakes Water Quality Agreement established the western and central basin of Lake Erie total phosphorus (TP) target of 6000 metric tons per year. Models that develop load-response curves showed that daily loads and annual loads of the Detroit River are important. Direct measurements near the river mouth are difficult due to Lake Erie seiches and surface oscillations. Therefore, an alternative approach for estimating daily loads is needed. We show that existing turbidity-TP relationships can be applied to water treatment plant (WTP) turbidity to develop daily load estimates by those responsible for routine monitoring. We show how turbidity measured at WTP are comparable to those measured in the river. WTP uses an existing infrastructure that is of high temporal resolution, so agencies charged with determining loads may use this network. By using daily water flux and the WTP-based observations, daily TP concentration estimates and loads are applied upstream near Belle Isle and downstream near Fighting Island. By adding the respective loads to the river, we obtain daily TP flux estimates to Lake Erie. Due to well known turbidity gradients, the Windsor WTP needs an adjustment to better reflect turbidity in the entire river. After adjusting, the summed daily rates to Lake Erie from both stations are comparable each other and to other rates. We also show the 2019–2024 annual averages are approximately 15 % greater than that estimated by the Environmental Protection Agency (EPA) and Environment and Climate Change Canada (ECCC). These daily and annual load estimates can be useful augmentations of more traditional monitoring efforts that provide only annual loads.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102701"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-10-02DOI: 10.1016/j.jglr.2025.102669
Dustin W. Kincaid , Matthew W. Diebel , Erin E. Bertke , Donald B. Bonville , Greg F. Koltun , Dale M. Robertson , Luke C. Loken
Reducing phosphorus (P) flux to the Great Lakes is critical for improving water quality and controlling eutrophication. We used 13 water years (2011–2023) of U.S. Geological Survey data from 24 major U.S. tributaries (representing 47% of the U.S. Great Lakes watershed area) to evaluate temporal changes in orthophosphate (PO4-P) and total P (TP) using Weighted Regressions on Time, Discharge, and Season. We assessed actual and flow-normalized P concentrations and fluxes. Between 2011 and 2023, P concentrations and fluxes declined in many tributaries, although the extent and significance of these declines varied. Decreases were more common and statistically likely for TP than PO4-P, and several high-loading watersheds had modest or non-significant changes. Flow-normalized PO4-P:TP flux ratios increased in over half the tributaries, suggesting that even where P reductions occurred, reductions in the more bioavailable P fraction were proportionally smaller. Actual P fluxes were strongly correlated with streamflow, and year-to-year variability in actual fluxes was, on average, three times greater than variability related to trends in flow-normalized fluxes. This underscores the role of hydrology in modulating P export and highlights how changing precipitation and runoff patterns can obscure or counteract management progress. Spring accounted for the largest share of annual P flux in most tributaries, though many showed declining spring contributions. Our basin-wide analysis reveals that while management efforts may have yielded progress in reducing TP in many watersheds, additional strategies would be needed to address PO4-P reductions and account for changing hydrology, especially in high-contributing watersheds.
{"title":"Changes in phosphorus concentration and flux from 2011 to 2023 in major U.S. tributaries to the Laurentian Great Lakes","authors":"Dustin W. Kincaid , Matthew W. Diebel , Erin E. Bertke , Donald B. Bonville , Greg F. Koltun , Dale M. Robertson , Luke C. Loken","doi":"10.1016/j.jglr.2025.102669","DOIUrl":"10.1016/j.jglr.2025.102669","url":null,"abstract":"<div><div>Reducing phosphorus (P) flux to the Great Lakes is critical for improving water quality and controlling eutrophication. We used 13 water years (2011–2023) of U.S. Geological Survey data from 24 major U.S. tributaries (representing 47% of the U.S. Great Lakes watershed area) to evaluate temporal changes in orthophosphate (PO<sub>4</sub>-P) and total P (TP) using Weighted Regressions on Time, Discharge, and Season. We assessed actual and flow-normalized P concentrations and fluxes. Between 2011 and 2023, P concentrations and fluxes declined in many tributaries, although the extent and significance of these declines varied. Decreases were more common and statistically likely for TP than PO<sub>4</sub>-P, and several high-loading watersheds had modest or non-significant changes. Flow-normalized PO<sub>4</sub>-P:TP flux ratios increased in over half the tributaries, suggesting that even where P reductions occurred, reductions in the more bioavailable P fraction were proportionally smaller. Actual P fluxes were strongly correlated with streamflow, and year-to-year variability in actual fluxes was, on average, three times greater than variability related to trends in flow-normalized fluxes. This underscores the role of hydrology in modulating P export and highlights how changing precipitation and runoff patterns can obscure or counteract management progress. Spring accounted for the largest share of annual P flux in most tributaries, though many showed declining spring contributions. Our basin-wide analysis reveals that while management efforts may have yielded progress in reducing TP in many watersheds, additional strategies would be needed to address PO<sub>4</sub>-P reductions and account for changing hydrology, especially in high-contributing watersheds.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102669"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-07-01DOI: 10.1016/j.jglr.2025.102610
Dana K. Castle , Tracy Galarowicz , Edward F. Roseman , Tracy Claramunt , Justin Chiotti , Robert Dvorak
Habitat and water quality were historically degraded within the St. Clair-Detroit River System (SCDRS). Beginning in 2004, extensive habitat restoration projects were implemented remediating losses of fish spawning beds and shoreline areas. Monitoring of post-restoration activities documented recovering fish populations; however, angler response remains unknown. Extensive creel surveys were conducted pre-restoration (2002–2004), but post-restoration (2012 and later) surveys were intermittent. The goal of this project was to examine both to create a comprehensive picture of the effects of restoration on angling. We calculated catch and harvest rates and inspected answers to supplemental questions collected by state and provincial agencies. We estimated economic impact of angling with a combination of lodging and gas expenses. Post-restoration, catch rates were higher, but harvest rates were variable for Lake St. Clair and the Detroit River. The 2017 open water boat fishery on Lake St. Clair was worth ∼$26 million. Increased fishing opportunities resulting from continued habitat and population recovery are leading to increased catch rates and likely attracting anglers to the area.
{"title":"Angler dynamics in the St. Clair-Detroit River System after decades of change","authors":"Dana K. Castle , Tracy Galarowicz , Edward F. Roseman , Tracy Claramunt , Justin Chiotti , Robert Dvorak","doi":"10.1016/j.jglr.2025.102610","DOIUrl":"10.1016/j.jglr.2025.102610","url":null,"abstract":"<div><div><span>Habitat and water quality were historically degraded within the St. Clair-Detroit River System (SCDRS). Beginning in 2004, extensive habitat restoration projects were implemented remediating losses of fish </span>spawning beds and shoreline areas. Monitoring of post-restoration activities documented recovering fish populations; however, angler response remains unknown. Extensive creel surveys were conducted pre-restoration (2002–2004), but post-restoration (2012 and later) surveys were intermittent. The goal of this project was to examine both to create a comprehensive picture of the effects of restoration on angling. We calculated catch and harvest rates and inspected answers to supplemental questions collected by state and provincial agencies. We estimated economic impact of angling with a combination of lodging and gas expenses. Post-restoration, catch rates were higher, but harvest rates were variable for Lake St. Clair and the Detroit River. The 2017 open water boat fishery on Lake St. Clair was worth ∼$26 million. Increased fishing opportunities resulting from continued habitat and population recovery are leading to increased catch rates and likely attracting anglers to the area.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102610"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-10-15DOI: 10.1016/j.jglr.2025.102684
Rosaura J. Chapina , Brian P. O’Malley , Kelly Bowen , Martta L.M. Viljanen , Zachary A. Bess , Daniel L. Yule , Jens C. Nejstgaard , Stella A. Berger , Michael D. Rennie , Michael J. Paterson , Steve A. Pothoven , James M. Watkins , Lars G. Rudstam , Sudeep Chandra , Jason D. Stockwell
Light regulates the vertical migration of many aquatic organisms. Mysis species couple pelagic and benthic habitats in lakes by diel vertical migrations (DVM), transporting energy and nutrients through the water column and food web. Although Mysis are generally assumed to remain on the bottom during the day, some have been observed in the pelagic zone during the day, indicating incomplete benthic-pelagic coupling in some systems. The degree to which light attenuation and lake depth interact to affect occurrence of mysids within the water column during the day is understudied. We used standardized Mysis net sampling in summers 2020 and 2021 across nine north-temperate lakes to test the hypotheses that 1) Mysis remain pelagic during the day at depths with sufficiently low light levels, and 2) pelagic-caught individuals during the day are, on average, smaller than those caught at night. To test these hypotheses, we assessed light, dissolved oxygen (DO), Mysis densities, and size distribution between night and day across bathymetric depths. In deep lakes and darkly colored shallow lakes, Mysis suspended in the water column during the day where light levels decreased to their light avoidance threshold (∼10-5 to 10-6 lx). Mysis suspended in the water column during the day were smaller than those collected at night. Further, Mysis were not captured when DO reached levels < 3 mg/L, regardless of light conditions. Our results suggest that benthic-pelagic coupling by Mysis is mediated through light conditions, lake morphometry, and DO conditions, and may include some degree of size-dependent behavior.
{"title":"Lake depth and light conditions alter Mysis vertical distributions","authors":"Rosaura J. Chapina , Brian P. O’Malley , Kelly Bowen , Martta L.M. Viljanen , Zachary A. Bess , Daniel L. Yule , Jens C. Nejstgaard , Stella A. Berger , Michael D. Rennie , Michael J. Paterson , Steve A. Pothoven , James M. Watkins , Lars G. Rudstam , Sudeep Chandra , Jason D. Stockwell","doi":"10.1016/j.jglr.2025.102684","DOIUrl":"10.1016/j.jglr.2025.102684","url":null,"abstract":"<div><div>Light regulates the vertical migration of many aquatic organisms. <em>Mysis</em> species couple pelagic and benthic habitats in lakes by diel vertical migrations (DVM), transporting energy and nutrients through the water column and food web. Although <em>Mysis</em> are generally assumed to remain on the bottom during the day, some have been observed in the pelagic zone during the day, indicating incomplete benthic-pelagic coupling in some systems. The degree to which light attenuation and lake depth interact to affect occurrence of mysids within the water column during the day is understudied. We used standardized <em>Mysis</em> net sampling in summers 2020 and 2021 across nine north-temperate lakes to test the hypotheses that 1) <em>Mysis</em> remain pelagic during the day at depths with sufficiently low light levels, and 2) pelagic-caught individuals during the day are, on average, smaller than those caught at night. To test these hypotheses, we assessed light, dissolved oxygen (DO), <em>Mysis</em> densities, and size distribution between night and day across bathymetric depths. In deep lakes and darkly colored shallow lakes, <em>Mysis</em> suspended in the water column during the day where light levels decreased to their light avoidance threshold (∼10<sup>-5</sup> to 10<sup>-6 lx</sup>). <em>Mysis</em> suspended in the water column during the day were smaller than those collected at night. Further, <em>Mysis</em> were not captured when DO reached levels < 3 mg/L, regardless of light conditions. Our results suggest that benthic-pelagic coupling by <em>Mysis</em> is mediated through light conditions, lake morphometry, and DO conditions, and may include some degree of size-dependent behavior.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102684"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-08-06DOI: 10.1016/j.jglr.2025.102653
Anna L. Haws , John M. Farrell
The Eurasian round goby (Neogobius melanostomus) is one of the most prevalent invasive fish species globally, with extensive non-native populations in diverse habitats of North America and Europe. Round goby invasions have exhibited context-specific responses in their life history traits (e.g., size and age structure, growth, maturation, spawning period, and mortality). Information on their evolutionary trajectories in different systems is needed to better understand the drivers behind their variable levels of success among sections of their introduced range. In the upper St. Lawrence River (USLR), round gobies are known to achieve some of the largest body sizes recorded among freshwater populations, breaking upheld generalizations of lower growth potential in freshwater environments. In this study, we applied fisheries assessment methods to evaluate their population metrics in the USLR and aggregate reported population traits from the literature to provide a basis for comparison. We observed round goby maturation at 1–2 years of age, 74 % annual mortality, a 5-year lifespan, and body sizes that exceed other North American populations. This study indicates that ecological conditions in the USLR are highly favorable for round gobies, and available resources can support attaining large body size while also promoting early allocation into reproduction.
{"title":"Pace-of-life and population structure assessment of invasive round goby in the upper St. Lawrence River","authors":"Anna L. Haws , John M. Farrell","doi":"10.1016/j.jglr.2025.102653","DOIUrl":"10.1016/j.jglr.2025.102653","url":null,"abstract":"<div><div>The Eurasian round goby (<em>Neogobius melanostomus</em>) is one of the most prevalent invasive fish species globally, with extensive non-native populations in diverse habitats of North America and Europe. Round goby invasions have exhibited context-specific responses in their life history traits (e.g., size and age structure, growth, maturation, spawning period, and mortality). Information on their evolutionary trajectories in different systems is needed to better understand the drivers behind their variable levels of success among sections of their introduced range. In the upper St. Lawrence River (USLR), round gobies are known to achieve some of the largest body sizes recorded among freshwater populations, breaking upheld generalizations of lower growth potential in freshwater environments. In this study, we applied fisheries assessment methods to evaluate their population metrics in the USLR and aggregate reported population traits from the literature to provide a basis for comparison. We observed round goby maturation at 1–2 years of age, 74 % annual mortality, a 5-year lifespan, and body sizes that exceed other North American populations. This study indicates that ecological conditions in the USLR are highly favorable for round gobies, and available resources can support attaining large body size while also promoting early allocation into reproduction.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102653"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-09-17DOI: 10.1016/j.jglr.2025.102662
Austin Happel
Urbanization has drastically altered the riverine systems upon which cities once depended, leading to significant declines in suitable freshwater habitat and, consequently, biodiversity. The Chicago River exemplifies this transformation, with the added distinction of having been engineered to flow across a continental divide. Over the past 50 years, improvements in water quality have been closely associated with a transition to a fish community that is unexpectedly high in species richness. The goal of this research was to assess which fish species spawn in the Chicago River by capturing larvae. Light trapping conducted in the North and South Branches of the Chicago River between 2020 and 2022 yielded 2211 larval fish representing 24 species, identified using 16S rRNA Sanger sequencing. Peak abundance of larvae occurred in July, coinciding with water temperatures around 23 °C. Species considered pollution-intolerant were more common in the South Branch, whereas pollution-tolerant species were common in the North Branch. Larvae from families Atherinopsidae, Centrarchidae, and Leuciscidae (i.e., native minnows, formerly in the family Cyprinidae) were more abundant in the South Branch, suggesting that a combination of suitable substrate, submerged vegetation, and water quality must be present, potentially in backwater areas such as unused barge slips. As habitat restoration activities continue, more species are likely to exhibit successful reproduction in the system. These findings suggest that other heavily modified urban river systems may support resilient, biodiverse fish communities.
{"title":"Larval fish community of the urbanized Chicago River","authors":"Austin Happel","doi":"10.1016/j.jglr.2025.102662","DOIUrl":"10.1016/j.jglr.2025.102662","url":null,"abstract":"<div><div>Urbanization has drastically altered the riverine systems upon which cities once depended, leading to significant declines in suitable freshwater habitat and, consequently, biodiversity. The Chicago River exemplifies this transformation, with the added distinction of having been engineered to flow across a continental divide. Over the past 50 years, improvements in water quality have been closely associated with a transition to a fish community that is unexpectedly high in species richness. The goal of this research was to assess which fish species spawn in the Chicago River by capturing larvae. Light trapping conducted in the North and South Branches of the Chicago River between 2020 and 2022 yielded 2211 larval fish representing 24 species, identified using 16S rRNA Sanger sequencing. Peak abundance of larvae occurred in July, coinciding with water temperatures around 23 °C. Species considered pollution-intolerant were more common in the South Branch, whereas pollution-tolerant species were common in the North Branch. Larvae from families Atherinopsidae, Centrarchidae, and Leuciscidae (i.e., native minnows, formerly in the family Cyprinidae) were more abundant in the South Branch, suggesting that a combination of suitable substrate, submerged vegetation, and water quality must be present, potentially in backwater areas such as unused barge slips. As habitat restoration activities continue, more species are likely to exhibit successful reproduction in the system. These findings suggest that other heavily modified urban river systems may support resilient, biodiverse fish communities.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102662"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-01Epub Date: 2025-05-26DOI: 10.1016/j.jglr.2025.102605
Robin L. DeBruyne , Edward F. Roseman , Ashley H. Moerke , Lauren M. Fry , Michael R. Twiss , Samantha N. Tank
The Laurentian Great Lakes are connected via naturally occurring straits and rivers: St. Marys River, Straits of Mackinac, St. Clair-Detroit River System, Niagara River, and the St. Lawrence River. Despite the historical ecological and economic importance of these waters, international agreements (e.g., Great Lakes Water Quality Agreement) only recently explicitly named the Great Lakes Connecting Waters (GLCWs), requiring governments to address the challenges of adequate restoration and protection from historical use and degradation. Standardized research and monitoring activities are needed; however, there is no established mechanism for coordination across the GLCWs. A three-day summit in 2023 convened experts to form the initial framework for a GLCWs Collaborative to increase standardizations and knowledge transfer. Participants drafted a governance structure and priorities following the principles of collective impact but allowed for place-based specificity for local connecting water organizations. Priorities and suggestions for success included: 1) co-development of the collaborative with all rights holders, stakeholders, and surrounding communities; 2) investment in research and technology specific to GLCWs; 3) investment in information transfer and training; 4) increased communication; and 5) better integration into existing Great Lakes research, monitoring, and funding programs. Expanding participation in all local GLCWs organizations with principles of inclusivity was identified as a larger collaborative goal. Next steps in the development of a GLCWs Collaborative include increased communication and formation of working groups and obtaining funding for a dedicated organization to begin supporting activities (communication, facilitation, logistics). By using a deliberate process for establishment, the potentially slower time frame for establishment may result in increased participation and success.
{"title":"Visioning and conceptual framework for coordinating Great Lakes connecting waters research and monitoring","authors":"Robin L. DeBruyne , Edward F. Roseman , Ashley H. Moerke , Lauren M. Fry , Michael R. Twiss , Samantha N. Tank","doi":"10.1016/j.jglr.2025.102605","DOIUrl":"10.1016/j.jglr.2025.102605","url":null,"abstract":"<div><div>The Laurentian Great Lakes are connected via naturally occurring straits and rivers: St. Marys River, Straits of Mackinac, St. Clair-Detroit River System, Niagara River, and the St. Lawrence River. Despite the historical ecological and economic importance of these waters, international agreements (e.g., Great Lakes Water Quality Agreement) only recently explicitly named the Great Lakes Connecting Waters (GLCWs), requiring governments to address the challenges of adequate restoration and protection from historical use and degradation. Standardized research and monitoring activities are needed; however, there is no established mechanism for coordination across the GLCWs. A three-day summit in 2023 convened experts to form the initial framework for a GLCWs Collaborative to increase standardizations and knowledge transfer. Participants drafted a governance structure and priorities following the principles of collective impact but allowed for place-based specificity for local connecting water organizations. Priorities and suggestions for success included: 1) co-development of the collaborative with all rights holders, stakeholders, and surrounding communities; 2) investment in research and technology specific to GLCWs; 3) investment in information transfer and training; 4) increased communication; and 5) better integration into existing Great Lakes research, monitoring, and funding programs. Expanding participation in all local GLCWs organizations with principles of inclusivity was identified as a larger collaborative goal. Next steps in the development of a GLCWs Collaborative include increased communication and formation of working groups and obtaining funding for a dedicated organization to begin supporting activities (communication, facilitation, logistics). By using a deliberate process for establishment, the potentially slower time frame for establishment may result in increased participation and success.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 6","pages":"Article 102605"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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