Journal of Great Lakes Research最新文献_第4页

Effects of river floods and sedimentation on a naturally dynamic Great Lakes estuary

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-02-01 DOI: 10.1016/j.jglr.2024.102458

Faith A. Fitzpatrick , Angus Vaughan , Eric D. Dantoin , Shelby P. Sterner , Paul C. Reneau , Collin J. Roland

{"title":"Effects of river floods and sedimentation on a naturally dynamic Great Lakes estuary","authors":"Faith A. Fitzpatrick , Angus Vaughan , Eric D. Dantoin , Shelby P. Sterner , Paul C. Reneau , Collin J. Roland","doi":"10.1016/j.jglr.2024.102458","DOIUrl":"10.1016/j.jglr.2024.102458","url":null,"abstract":"<div><div>Some of the most biologically diverse coastal wetlands and estuaries are found along the Great Lakes, but the spatial extent and timing of river-related inundation and sedimentation vary greatly among natural and altered systems. We used hydrologic data, geomorphic change detection, and satellite imagery to study inundation and sedimentation patterns in the naturally dynamic estuary of the Bad River (<em>Mashkiiziibii</em>) that flows into Lake Superior (<em>Anishinaabeg-gichigami</em>), and the Kakagon River (<em>Ogaakaagaang-ziibii</em>) that flows into a sheltered bay (<em>Chi-Kaamigong</em>). In 2016, an extreme summer flood (annual exceedance probability < 0.2 %) caused total inundation of the 46-km<sup>2</sup> estuary. Floods from the sediment-rich Bad River, with an annual exceedance probability of ≤ 50 %, have overflowed into the upper wetlands and channels of the Kakagon River about 60 times over the last 75 years, including 20 floods during the most recent 10-year wet period. Sedimentation patterns were associated with proximity to river channels, shoreline erosion, and wind action. Early winter ice-up coupled with a storm surge and an early spring snowmelt into the iced-over bay changed inundation duration and sedimentation patterns. Climate-change projections for more intense rainfall and warmer temperatures will likely cause more frequent flooding and sedimentation; however, patterns may differ depending on the timing of the floods relative to storm surges and ice formation, or other factors. The approach of integrating readily available data helped give a broader temporal and spatial context to the possible causes for inundation and sedimentation, some expected and others not, in natural and restored estuaries of the Great Lakes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102458"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intraspecific variation in stable isotopes provides insight into adfluvial migrations and ecology of brook trout in Lake Superior tributaries

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-02-01 DOI: 10.1016/j.jglr.2024.102487

Troy G. Zorn , Kevin Pangle , Nick Peterson , Henry Quinlan , Brandon Gerig

{"title":"Intraspecific variation in stable isotopes provides insight into adfluvial migrations and ecology of brook trout in Lake Superior tributaries","authors":"Troy G. Zorn , Kevin Pangle , Nick Peterson , Henry Quinlan , Brandon Gerig","doi":"10.1016/j.jglr.2024.102487","DOIUrl":"10.1016/j.jglr.2024.102487","url":null,"abstract":"<div><div>Identifying streams hosting salmonids with poorly understood adfluvial life histories, such as coaster brook trout, is challenging due to the lack of inexpensive, non-lethal techniques for confirming lake to stream movements for stream-captured fish. In this study, we used stable isotope data from 589 brook trout collected throughout the Lake Superior basin to characterize stream versus Lake Superior foraging. We observed strong isotopic separation in δ<sup>13</sup>C between brook trout inhabiting Lake Superior and lake-inaccessible stream reaches (i.e., those lacking Lake Superior access). Using these data, we developed a linear discriminant function (LDF) which assigned brook trout to Lake Superior or stream habitats with over 97 % accuracy. LDF and Bayesian stable isotope mixing models were then used to estimate stream and lake energy use by brook trout collected from lake-accessible reaches. Brook trout caught in lake-accessible reaches had isotope signatures and sizes that were intermediate to fish from lake-inaccessible reaches and Lake Superior, potentially indicative of Lake Superior to stream migrations or possibly an energy subsidy from adfluvial migrants in streams. The LDF was used to estimate the probability that recently grown fin tissue from brook trout collected in lake-accessible reaches resulted from foraging in Lake Superior. We identified tributaries hosting “likely” coaster brook trout using a fish’s length and LDF probability value. Our findings show the potential and limitations of this approach for confirming adfluvial migrations of brook trout.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102487"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129673","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}

引用次数: 0

Documentation of a probable spawning run of cisco Coregonus artedi in the Spanish River, Ontario, Canada

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102421

Andrew E. Honsey , Ralph W. Tingley III , Katie V. Anweiler , Cory O. Brant , Marc Chalupnicki , Chris Davis , Steven A. Farha , Paul W. Fedorowicz , Todd Hayden , Philippa Kohn , Benjamin S. Leonhardt , Brian P. O’Malley

{"title":"Documentation of a probable spawning run of cisco Coregonus artedi in the Spanish River, Ontario, Canada","authors":"Andrew E. Honsey , Ralph W. Tingley III , Katie V. Anweiler , Cory O. Brant , Marc Chalupnicki , Chris Davis , Steven A. Farha , Paul W. Fedorowicz , Todd Hayden , Philippa Kohn , Benjamin S. Leonhardt , Brian P. O’Malley","doi":"10.1016/j.jglr.2024.102421","DOIUrl":"10.1016/j.jglr.2024.102421","url":null,"abstract":"<div><div>Coregonines were historically diverse and abundant in the Laurentian Great Lakes but declined throughout the 19th and 20th centuries due to multiple factors, including overfishing, habitat degradation, and interactions with invasive species. Great Lakes fishery managers are now working to restore coregonines across the basin. An important aspect of restoration efforts is the identification of key habitats, such as spawning habitats. Our understanding of the extent and diversity of coregonine spawning habitats in the Great Lakes is limited. Historical accounts suggest some cisco <em>Coregonus artedi</em> migrated to tributaries to spawn, but contemporary runs have not been reported. Moreover, cisco display considerable phenotypic variation, with different “forms” often occupying specific habitats or regions. We provide evidence for a previously undocumented spawning run of cisco in the Spanish River, a tributary to the North Channel of Lake Huron. We captured 31 mature and ripe fish (25 males, 6 females) approximately 52 km upstream of the river mouth on 15–16 November 2022. The fish ranged in age from 3-9 yr and total length from 287-394 mm. Of these 31 individuals, 27 were morphologically similar to <em>C. artedi manitoulinus</em>, a subspecies of cisco found in the North Channel; however, four individuals more closely resembled cisco captured in other areas of Lake Huron. These findings represent the best evidence of tributary spawning by cisco since the 1880s, and they have important implications for coregonine conservation and restoration efforts. Ongoing work aims to augment our understanding of the ecological and evolutionary importance of this population.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102421"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated water quality assessment of open water bodies using empirical equations and remote sensing techniques in Bangweulu Wetland lakes, Zambia

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102451

Misheck Lesa Chundu, Kawawa Banda, Henry M. Sichingabula, Imasiku A. Nyambe

{"title":"Integrated water quality assessment of open water bodies using empirical equations and remote sensing techniques in Bangweulu Wetland lakes, Zambia","authors":"Misheck Lesa Chundu, Kawawa Banda, Henry M. Sichingabula, Imasiku A. Nyambe","doi":"10.1016/j.jglr.2024.102451","DOIUrl":"10.1016/j.jglr.2024.102451","url":null,"abstract":"<div><div>Water quality assessment is essential for conserving aquatic ecosystems and human consumption. However, monitoring several water quality parameters in open water bodies poses significant challenges, resulting in gaps and limitations. While the Water Quality Index (WQI) integrates various water quality parameters, its spatial application has not yet been thoroughly evaluated. To address these issues, this study was conducted to establish an integrated remote sensing approach for comprehensive monitoring of water quality. Utilising Sentinel 2 data alongside on-site/lab water quality measurements, various relationships were established. The calculated mean WQI from on-site/lab data was 35, while from remotely sensed data was 41. Linear relationships (R<sup>2</sup>) between WQI and various water quality parameters such as chloride (0.712), sodium (0.705), TDS (0.705), turbidity (0.628), and EC (0.704) were observed. These relationships facilitated the transformation of water quality parameter maps into WQI maps, the WQI maps were then integrated into one WQI map showing the overall water quality status of the Bangweulu Wetland lakes. Both on-site/lab and remote sensing methods indicated that the concentrations of water quality parameters in the Bangweulu Wetland lakes is lower (better) than the local and international recommended limits, with a calculated WQI falling within the ’Good’ category. This indicates that the water is fresh, clean, and suitable for various purposes including ecological preservation, agriculture, aquaculture, recreation, industrial use, and human consumption. The findings offer insights into the general status of water quality in open water bodies, identifying hot spots and potential sources of water pollution with implications for future management practices.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102451"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142061","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}

引用次数: 0

Assessing water clarity status and long-term trends in North America’s largest lakes using ESA’s Ocean Colour Climate Change Initiative (OC-CCI) products

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102454

Caren Binding , Matt Morison , Michael Sayers , Karl Bosse , Xinhua Zhu , Chuiqing Zeng , Varunan Theenathayalan

{"title":"Assessing water clarity status and long-term trends in North America’s largest lakes using ESA’s Ocean Colour Climate Change Initiative (OC-CCI) products","authors":"Caren Binding , Matt Morison , Michael Sayers , Karl Bosse , Xinhua Zhu , Chuiqing Zeng , Varunan Theenathayalan","doi":"10.1016/j.jglr.2024.102454","DOIUrl":"10.1016/j.jglr.2024.102454","url":null,"abstract":"<div><div>Water clarity, as measured by Secchi disk depth (Z<sub>SD</sub>) or diffuse attenuation (Kd), is an important indicator of a lake’s ecosystem state and can be reliably retrieved using satellite remote sensing. By combining data from multiple satellite missions, the European Space Agency’s Ocean Colour Climate Change Initiative (OC-CCI) aims to deliver stable, long-term, satellite data products suitable for trend assessments. Here we demonstrate the value of OC-CCI products for reporting on water clarity status and long-term trends in North America’s largest lakes. Extensive matchups between the OC-CCI Kd at 490 nm (Kd<sub>490</sub>) and in situ Z<sub>SD</sub> observations spanning 25 years enabled robust multi-lake validation of Z<sub>SD</sub> retrievals over a wide range of water clarity conditions (R<sup>2</sup> = 0.9, MAPE = 29.6 %, BIAS = 6.6 %, N = 4297) providing a transferable model for large-scale mapping of inland water clarity. Significant differences in Z<sub>SD</sub> retrieval uncertainty were observed between years, missions, and specific periods marking changes in the sensor datasets contributing to the OC-CCI products. Bias-correction of the OC-CCI Kd<sub>490</sub> provided confidence in the assumption of seamless continuity in this multi-mission dataset, thereby allowing long-term time-series analyses. Seasonal, inter-annual and inter-decadal variability and trends in lake-wide average Z<sub>SD</sub> were subsequently evaluated for nine large lakes across Canada and the U.S. over the 1998–2023 period, capturing the timing and magnitude of significant shifts in water clarity conditions. Observations agree well with documented periods of ecosystem change in response to the cumulative impacts from harmful algal blooms, nutrient status, invasive species, and hydrological events.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102454"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparisons of isotopic niche between females and male alternative reproductive tactics of Chinook salmon (Oncorhynchus tshawytscha) from Lake Ontario

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102423

K.A. Adeli , K. Johnson , T.E. Pitcher

{"title":"Comparisons of isotopic niche between females and male alternative reproductive tactics of Chinook salmon (Oncorhynchus tshawytscha) from Lake Ontario","authors":"K.A. Adeli , K. Johnson , T.E. Pitcher","doi":"10.1016/j.jglr.2024.102423","DOIUrl":"10.1016/j.jglr.2024.102423","url":null,"abstract":"<div><div>Chinook salmon (<em>Oncorhynchus tshawytscha</em>) have complex life histories with two distinct male alternative reproductive tactics (ARTs). The larger and older “hooknose” males battle for position to spawn with nesting females whereas the precociously maturing “jack” males use a sneaking tactic to gain access to females. Although dietary niche is known to differ between ARTs of other fish taxa, no research to date has examined these differences in a salmonid. Here, we used δ<sup>15</sup>N and δ<sup>13</sup>C stable isotope analyses to compare the dietary niches of female, hooknose male, and jack male Chinook salmon sampled from a Lake Ontario tributary. We found that all three life histories shared similar δ<sup>15</sup>N values, whereas jack males had greater δ<sup>13</sup>C values compared to hooknose males, with females having intermediate values. Jack males also had notably little overlap in their isotopic niche space with hooknose males and females, indicating that jack males occupy a distinct isotopic niche in Lake Ontario. We discuss habitat partitioning and differences in dietary niche as explanatory factors. Altogether, these data unveil novel distinctions in isotopic niche within the complex life history strategies of Chinook salmon in Lake Ontario that can inform management decisions and provide avenues for future research.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102423"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Waterbird disease in the United States Laurentian Great Lakes under climate change

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102450

Nathan Alexander , Amy Dickinson , Thomas J. Benson , Trenton W. Ford , Nohra Mateus-Pinilla , Jade Arneson , Mark A. Davis

{"title":"Waterbird disease in the United States Laurentian Great Lakes under climate change","authors":"Nathan Alexander , Amy Dickinson , Thomas J. Benson , Trenton W. Ford , Nohra Mateus-Pinilla , Jade Arneson , Mark A. Davis","doi":"10.1016/j.jglr.2024.102450","DOIUrl":"10.1016/j.jglr.2024.102450","url":null,"abstract":"<div><div>Since the turn of the 21st century, anecdotal evidence suggests that incidences of avian disease in natural populations in the Laurentian Great Lakes are increasing, with recent high-profile outbreaks including avian botulism in 2020 and avian influenza in 2022. To understand avian diseases, we must understand environmental associations and their relationships with disease outbreaks. Here, we conducted a scoping review on avian disease in the Laurentian Great Lakes using concept pools and key words, with specific attention to Green Bay, Lake Michigan and the endangered piping plover (<em>Charadrius melodus</em>). Green Bay represents a mesocosm of environmental stressors that continue to disrupt similar Great Lakes ecosystems, has a rich assemblage of waterbirds, including species of concern, and has intensive conservation investment and management. We sought to 1) synthesize the general knowledge of avian disease in the watershed, 2) understand how species’ biology may impact transmission, and 3) identify potential drivers (i.e. water quality, climate) that may influence avian disease patterns. We identified and provided descriptions and histories of three viruses (avian influenza, duck plague, and Newcastle disease), two bacteria (avian cholera and <em>Salmonella</em>), and two toxins (botulism types C and E). Overall, density dependent effects including carcass abundance, waterbird community, and population structure, as well as environmental conditions such as temperature, <em>Cladophora</em> presence, and water pH need to be considered for mitigating disease outbreaks. Future waterbird management will require rapid responses to contend with increasing disease outbreaks ostensibly linked to climate change, and requires incorporating climate change into disease modeling.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102450"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantifying phosphorus loads from legacy-phosphorus fields

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102446

Michael R. Brooker , Jessica D’Ambrosio , Margaret Kalcic , Kevin W. King , Greg LaBarge , Brian Roe , Nathan D. Stoltzfus , Sam Sage , Rachelle Crow , Robyn S. Wilson , Ryan J. Winston , Jay F. Martin

{"title":"Quantifying phosphorus loads from legacy-phosphorus fields","authors":"Michael R. Brooker , Jessica D’Ambrosio , Margaret Kalcic , Kevin W. King , Greg LaBarge , Brian Roe , Nathan D. Stoltzfus , Sam Sage , Rachelle Crow , Robyn S. Wilson , Ryan J. Winston , Jay F. Martin","doi":"10.1016/j.jglr.2024.102446","DOIUrl":"10.1016/j.jglr.2024.102446","url":null,"abstract":"<div><div>Agriculture is a major contributor to eutrophication across the world. Such is the case for Lake Erie where P loads support recurrent harmful cyanobacterial blooms. To mitigate these blooms, targets have been set for total and dissolved reactive P (TP/DRP) loads during the annual and March-July periods. To accelerate progress towards meeting these goals, a targeted management approach aimed at the fields with the greatest P loads has been suggested. A public–private partnership recruited legacy-P fields to quantify P loads in runoff by leveraging the positive relationship between soil test P (STP) and discharge P concentrations. Legacy-P fields were previously defined as having one or more zones with STP >100 ppm (two-fold above agronomic needs); all others were termed agronomic-P fields. Edge-of-field monitoring was performed during 2021 on 11 legacy-P and 13 agronomic-P fields (total n = 24). Legacy-P fields had 2-fold greater March-July DRP loads but only 0.5-fold greater annual TP loads, though both were statistically nonsignificant effects (g≈0.5). Effects were smaller (g≈0.2) for March-July TP and annual DRP. Over half of the legacy-P fields lacked meaningful (<1% of total) surface loads with little to no observed runoff. Further analysis revealed that legacy-P fields had a stronger effect on subsurface discharge, with a statistically significant effect (g = 0.81, p = 0.05) on the March-July DRP concentrations. Statistical significance in this study was obscured due to a large degree of variance and limited sample size, however, the differences reported here could have practical importance to managers working to address eutrophication across Lake Erie and other watersheds.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102446"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143107","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}

引用次数: 0

Effect of an invasive species Mnemiopsis leidyi on the zooplankton community structure in the Caspian Sea

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102420

Abolghasem Roohi, Hasan Fazli, Mozhgan Rowshantabari, Rahimeh Rahmati, Norbakhsh Khodaparast

{"title":"Effect of an invasive species Mnemiopsis leidyi on the zooplankton community structure in the Caspian Sea","authors":"Abolghasem Roohi, Hasan Fazli, Mozhgan Rowshantabari, Rahimeh Rahmati, Norbakhsh Khodaparast","doi":"10.1016/j.jglr.2024.102420","DOIUrl":"10.1016/j.jglr.2024.102420","url":null,"abstract":"<div><div>During the past three decades, the Caspian Sea (CS) ecosystem has undergone striking changes due to anthropogenic activities, particularly following the invasion of comb jelly <em>Mnemiopsis leidyi</em> that overfed on zooplankton in the late 1990 s. This study investigated the temporal and spatial patterns of the zooplankton community in CS over 25-year intervals using univariate and multivariate analyses. The objective was to assess the status of the zooplankton community through a comparison of the pre-invasion (1994–96) and post-invasion (2009–11 and 2018–19) of <em>M. leidyi</em> in the CS. The study revealed more zooplankton taxa for the pre-invasion period and fewer for the post-invasion period of 2018–19. Several key species such as <em>Eurytemora grimmi, Polyphemus exicus</em>, <em>Synchaeta</em> sp., and <em>Calanipeda aquae dulcis</em> disappeared post-invasion, and more than 50 taxa decreased to one-third in the post-invasion period. The abundance and diversity indices significantly declined following the invasion. The visualization of non-metric multidimensional scaling (nMDS) showed that periodic variations were more explanatory than assessments based on subareas and seasonal intervals. Significant differences were observed in the zooplankton assemblages across the three periods. In addition to highly affecting the zooplankton community, certain pelagic fish populations, notably those belonging to the kilka genus (<em>Clupenella</em>), have experienced significant decline as a result of <em>M. leidyi</em> invasion. In conclusion, the invasion of <em>M. leidyi</em> has caused major changes to the abundance and diversity of tropic levels in the CS, possibly through a combination of bottom-up and top-down forces at work in the ecosystem.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102420"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142060","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}

引用次数: 0

Long-term dynamics of dissolved oxygen and isotopic composition in Lake Erie and Lake Ontario: Implications for eutrophication and ecosystem health

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2024-12-01 DOI: 10.1016/j.jglr.2024.102447

Marlene Dordoni , Johannes A.C. Barth , Leonard I. Wassenaar

{"title":"Long-term dynamics of dissolved oxygen and isotopic composition in Lake Erie and Lake Ontario: Implications for eutrophication and ecosystem health","authors":"Marlene Dordoni , Johannes A.C. Barth , Leonard I. Wassenaar","doi":"10.1016/j.jglr.2024.102447","DOIUrl":"10.1016/j.jglr.2024.102447","url":null,"abstract":"<div><div>This study, focusing on Great Lakes Erie and Ontario, Canada, explores dissolved oxygen (DO) dynamics and its stable isotopic composition (<em>δ</em><sup>18</sup>O<sub>DO</sub>) in the Great Lakes. Using historical dissolved oxygen data from 1965 to 2021, combined with synoptic isotopic data collected in the early 2000s, the research examined the spatiotemporal trends in DO and <em>δ</em><sup>18</sup>O-DO to assess the effects of biotic and abiotic processes such as photosynthesis, respiration, and atmospheric gas exchange. The study revealed significant seasonal and depth-related variations in DO levels, with hypolimnetic hypoxia and metalimnetic oxygen minima (MOM) observed in both lakes. With its comparatively shallow depth and higher nutrient loads, Lake Erie exhibited more pronounced dissolved oxygen fluctuations, with DO levels reaching as low as 3.65 mg L<sup>−1</sup> and <em>δ</em><sup>18</sup>O<sub>DO</sub> values falling below +24.6 ‰. These findings indicated Lake Erie’s more dynamic metabolic environment, particularly during the thermally stratified season. In contrast, Lake Ontario showed more stable oxygen concentration levels, with occasional dissolved oxygen depletions down to 6.80 mg L<sup>−1</sup> and <em>δ</em><sup>18</sup>O<sub>DO</sub> values up to +32.1 ‰, suggesting more localised influences of external inputs and biological processes. This study provides a long-term perspective on dissolved oxygen status in these lakes and offers essential insights into their ecological health. This work contributes valuable data for managing and protecting the Great Lakes ecosystem.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 6","pages":"Article 102447"},"PeriodicalIF":2.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0