Journal of Great Lakes Research最新文献

FM2-3: Editorial Board / Information for Authors FM2-3：编辑委员会/作者信息

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-14 DOI: 10.1016/S0380-1330(25)00085-1

引用次数: 0

Chironomid assemblage response to cultural eutrophication and dreissenid mussel establishment in the Bay of Quinte, Ontario 安大略省昆特湾拟鱼群落对养殖富营养化和贻贝繁殖的响应

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-12 DOI: 10.1016/j.jglr.2025.102578

Lauren Alward , Isaac Armstrong , Stafford Rotehrá:kwas Maracle , Brian F. Cumming

{"title":"Chironomid assemblage response to cultural eutrophication and dreissenid mussel establishment in the Bay of Quinte, Ontario","authors":"Lauren Alward , Isaac Armstrong , Stafford Rotehrá:kwas Maracle , Brian F. Cumming","doi":"10.1016/j.jglr.2025.102578","DOIUrl":"10.1016/j.jglr.2025.102578","url":null,"abstract":"<div><div>The Bay of Quinte is a large (254 km<sup>2</sup>) embayment on Lake Ontario, which has experienced many environmental and ecological modifications since the arrival of European settlers. Extensive clearing of land and development of urban areas led to considerable eutrophication from anthropogenic nutrient loading in the late 1800s. The subsequent reduction of nutrient loading post-1977 was followed by the 1994 colonization of invasive dreissenid mussels, whose establishment was associated with benthification and an abrupt shift from a turbid eutrophic system to a clearer mesotrophic system. To investigate the response of the benthos to these stresses, a sediment core was collected in 2023, and sediment subsamples from 18 stratigraphic intervals were sifted to identify and enumerate subfossil chironomid (order: Diptera) assemblages. The cultural eutrophication of the bay was reflected in the sediment core by a shift from hypoxia-intolerant <em>Tanytarsus lugens</em> and <em>T. mendax</em> dominance to the more tolerant <em>Chironomus</em> sp. After 1977, <em>Chironomus</em> sp. decreased and <em>Tanytarsus</em> spp. and other hypoxia-intolerant taxa increased, consistent with nutrient abatement actions. Following dreissenid establishment (∼1994), there was a significant increase in chironomid head capsule abundance. ANOSIM suggests that the nutrient abatement actions may be a stronger driver of chironomid taxonomic and functional composition than the dreissenid invasion, though this may reflect the resolution and location of the sediment core. Overall, our results suggest chironomids experienced recovery from eutrophication and that benthic resource availability may have increased post-dreissenid invasion, which could benefit benthivorous fish.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102578"},"PeriodicalIF":2.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946567","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

From stream to surf zone: Differences in the composition and succession of Lake Superior macroinvertebrate communities 从溪流到冲浪带：苏必利尔湖大型无脊椎动物群落组成和演替的差异

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-11 DOI: 10.1016/j.jglr.2025.102580

Sam Miess , Mac Strand

{"title":"From stream to surf zone: Differences in the composition and succession of Lake Superior macroinvertebrate communities","authors":"Sam Miess , Mac Strand","doi":"10.1016/j.jglr.2025.102580","DOIUrl":"10.1016/j.jglr.2025.102580","url":null,"abstract":"<div><div>The benthic communities in the surf zone of the Laurentian Great Lakes were historically diverse assemblages with typically lotic taxa. Conditions were suitable for these lotic taxa due to wave activity and strong, nearshore currents. Due to anthropogenic stressors, including the introduction of <em>Dreissena</em> mussels, surf zone communities have been all but decimated in the lower Great Lakes. Remaining communities persist along the shorelines of Lake Superior, where they are influenced by lake conditions and tributary inputs. Despite their ecological importance, the relationship between these Great Lakes surf zone communities, nearby tributary communities, and the confluence (i.e., tributary mouth) communities has remained largely unexplored. This study compared the composition and succession of Lake Superior communities at three sites: tributary, confluence, and surf zone. Hester-Dendy multiplate samplers (n = 7 per site) were deployed for ∼ 28-day periods over the course of the ice-free season (May through October) to assess community composition. Although diversity was similar between sites, community composition was distinct between the sites across all sample periods. Overall, compositional shifts were greater along the shoreline community, followed by confluence and tributary communities. The magnitude of compositional shifts, as well as diversity and composition, varied across the sample periods. These results suggest these communities are distinct, exhibiting compositional shifts that appear to correspond with production peaks at each site. As warmer temperatures and intensified storms affect Lake Superior in the coming decades, it is important that further research explore the ecology of tributary, confluence, and surf zone communities to better preserve these fascinating communities.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102580"},"PeriodicalIF":2.4,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946560","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

Source and longevity of streambed sediment and phosphorus retention in a lake-plain tributary of the Maumee River 莫米河湖平原支流河床沉积物和磷滞留的来源和寿命

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-10 DOI: 10.1016/j.jglr.2025.102575

Tanja N. Williamson , Faith A. Fitzpatrick , Diana L. Karwan , Rebecca M. Kreiling , James D. Blount , Dayle J. Hoefling

{"title":"Source and longevity of streambed sediment and phosphorus retention in a lake-plain tributary of the Maumee River","authors":"Tanja N. Williamson , Faith A. Fitzpatrick , Diana L. Karwan , Rebecca M. Kreiling , James D. Blount , Dayle J. Hoefling","doi":"10.1016/j.jglr.2025.102575","DOIUrl":"10.1016/j.jglr.2025.102575","url":null,"abstract":"<div><div>We described abundance and source of soft, fine-grained, streambed sediment and associated phosphorus (sed-P) during summer low flow in Little Flatrock Creek (LFR), a channelized tributary of the Maumee River and western Lake Erie. Reach-level assessments compared streambed-sediment storage to streambank erosion. Streambed sediment was fingerprinted and analyzed for sed-P and the potential for P de/sorption between the water column and streambed sediment. The ratio of two fallout radionuclides apportioned “new sediment” in streambed storage. Basin-wide streambed-sediment storage exceeded both annual streambank erosion and the annual suspended-sediment load. Streambed sediment was generally a mix of streambank and cropland sources and each equaled or exceeded abundance of new streambed sediment, indicating accumulation of sediment from both sources during the current agricultural cycle. The implication is that this mix of new and old sediment, and legacy P, takes multiple events and seasons to be transported downstream. Streambed sediment had the potential to adsorb dissolved P (DP) from the water column, with sed-P stored in the silt + clay fraction similar to the annual particulate-P (total-dissolved) load transported with suspended sediment, but with lower concentrations than cropland- and streambank-sourced sediment. This indicates supplementation of water-column DP as sediment settles to the bottom and a lag between land and channel management and in-channel P availability. Storage of fine-grained sediment and sed-P in this lake-plain/bed basin is distinct from another Maumee headwater tributary with glacial-moraine controlled geomorphology. The implication is that streambank erosion, in-channel sediment accumulation, and the resultant total-dissolved-sediment P spiral differ based on geomorphic setting and drainage history.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102575"},"PeriodicalIF":2.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946566","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

Sedimentary recorded nitrogen-transforming microbes reflect climate fluctuations in a glacial lake on the Qinghai-Tibetan Plateau over a millennium timescale 沉积记录的氮转化微生物反映了青藏高原冰湖千年时间尺度上的气候波动

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-07 DOI: 10.1016/j.jglr.2025.102579

Jing Wang , Hanxiao Zhang , Shouliang Huo , Yong Liu , Jingtian Zhang

{"title":"Sedimentary recorded nitrogen-transforming microbes reflect climate fluctuations in a glacial lake on the Qinghai-Tibetan Plateau over a millennium timescale","authors":"Jing Wang , Hanxiao Zhang , Shouliang Huo , Yong Liu , Jingtian Zhang","doi":"10.1016/j.jglr.2025.102579","DOIUrl":"10.1016/j.jglr.2025.102579","url":null,"abstract":"<div><div>We used sedimentary ancient DNA (<em>seda</em>DNA) to reveal the temporal dynamics of the microbial community responsible for nitrogen (N) transformation within Lake Gyaring located on Qinghai-Tibetan Plateau over the past 1400 years. Our results revealed that the change points of microbial composition linked to N-transforming reactions occurred at ∼769 CE, ∼1286 CE, and ∼1850 CE, preceding the corresponding recorded climatic stages—the beginning of the Medieval Warm Period, the transition between the Medieval Warm Period and Little Ice Age, and the transition between the Little Ice Age and the Current Warm Period, respectively—by approximately 0–30 years. The dominant genus <em>Spirochaeta</em> and <em>Anaeromyxobacter</em> participating in N<sub>2</sub> fixation and dissimilatory nitrate reduction to ammonium (DNRA) underwent a sharp decrease, while the prevalent components <em>Iamia</em>, <em>Chitinophaga</em>, <em>Nitrospira</em>, and <em>Nitrosospira</em> involved in NH<sub>4</sub><sup>+</sup> assimilation, ammonification, and nitrification exerted an increase shift at ∼1300 CE. These variations closely matched evident decreases in total nitrogen (TN) content, total organic carbon (TOC) content, and the organic carbon to nitrogen (C:N) ratio, as well as a noticeable increase in TP content at ∼1300 CE. Partial least square path modeling revealed that those nutrient variations induced by climate fluctuations were the predominant driver for the microbial community succession with respect to N transformation. The prevailing community structure across distinct climate periods mainly arose from preferences of the microbial taxa for nutrient loading.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102579"},"PeriodicalIF":2.4,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946576","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

Regime shifts in satellite-derived chlorophyll within the Laurentian Great Lakes 劳伦森五大湖内卫星衍生叶绿素的状态变化

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-03 DOI: 10.1016/j.jglr.2025.102573

Nikolay P. Nezlin , SeungHyun Son , Christopher W. Brown , Prasanjit Dash , Caren E. Binding , Ashley K. Elgin , Andrea VanderWoude

{"title":"Regime shifts in satellite-derived chlorophyll within the Laurentian Great Lakes","authors":"Nikolay P. Nezlin , SeungHyun Son , Christopher W. Brown , Prasanjit Dash , Caren E. Binding , Ashley K. Elgin , Andrea VanderWoude","doi":"10.1016/j.jglr.2025.102573","DOIUrl":"10.1016/j.jglr.2025.102573","url":null,"abstract":"<div><div>As a result of implementation of nutrient management following the binational Great Lakes Water Quality Agreement in 1972, the ecosystems within the Laurentian Great Lakes were gradually transforming to lower trophic regimes. This transformation dramatically accelerated in the late 1980s after the introduction of two invasive species of filter-feeding mussels of the genus <em>Dreissena.</em> We performed a detailed analysis of spatial and temporal patterns of this transformation using remotely sensed surface chlorophyll-<em>a</em> concentration (<em>Chl-a</em>) from the multi-satellite long-term Ocean Colour Climate Change Initiative (OC-CCI) dataset as a proxy of ecosystem state. We analyzed 25 years (1997–2022) of monthly composites covering most of the Great Lakes’ area detecting regime shifts in <em>Chl-a</em> employing an integrated approach combining Seasonal-Trend decomposition (STL) and Sequential T-test Analysis of Regime Shifts (STARS). The results identified the timings (shift points) when <em>Chl-a</em> stabilized at new lower trophic regimes, the magnitudes of <em>Chl-a</em> decrease across various lake regions and depths, and the changes in <em>Chl-a</em> seasonal cycles. In Lakes Michigan, Huron, and Ontario, the timings and magnitudes of regime shifts and vanishing of spring phytoplankton bloom suggest that dreissenid mussel presence was a primary driving factor of the observed transformation. We demonstrate that the OC-CCI dataset is a reliable source of information that enables the detection of these regime shifts in major lakes, with only minor effects of inconsistencies resulting from the biases between different satellites collecting data during different time periods.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102573"},"PeriodicalIF":2.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946573","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

A five-year summary of water quality, zooplankton, and fishes in the open waters of Lake Erie’s Presque Isle Bay 伊利湖普莱斯克岛湾开放水域水质、浮游动物和鱼类的五年总结

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-03 DOI: 10.1016/j.jglr.2025.102574

Christopher M. Dempsey, Gregory M. Andraso, Michelle M. Kuns

{"title":"A five-year summary of water quality, zooplankton, and fishes in the open waters of Lake Erie’s Presque Isle Bay","authors":"Christopher M. Dempsey, Gregory M. Andraso, Michelle M. Kuns","doi":"10.1016/j.jglr.2025.102574","DOIUrl":"10.1016/j.jglr.2025.102574","url":null,"abstract":"<div><div>Long-term monitoring of freshwater ecosystems is critical to understanding how these systems change over time. Our efforts have focused on the open waters of Lake Erie’s Presque Isle Bay (PIB) in Erie, Pennsylvania. The bay serves as an important economic and recreational body of water to the Erie region. Over the last several decades, the bay has undergone numerous water-quality changes and has been well studied, but no researchers have monitored PIB on a continuous basis. In the summer of 2017, a monthly monitoring program was started that focuses on detecting changes in water-quality as well as zooplankton and fish communities. Monitoring is focused from June through November each year. Sampling occurs each month in the same location aboard the <em>RV Environaut</em>. Here, data collected from 2017 through 2021 are presented to document changes in water quality, zooplankton, and fishes in the open waters of PIB. Analyses of variance (ANOVA) revealed a strong seasonal pattern and among-year variation in many water quality and fish parameters. Across the five-year period, linear regression revealed significant decreases in pH, Z<sub>1%</sub> (the depth at which 1% of the light from the surface remains), and juvenile copepod abundance that we link to changes in water level. Our data contribute to the growing body of literature that highlights the importance of studying the near-shore embayments and coastal wetlands in Lake Erie. These shallow areas often respond to environmental perturbations faster or differently than the open waters of the lake.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102574"},"PeriodicalIF":2.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946564","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

Effects of Nile tilapia (Oreochromis niloticus) cage aquaculture on water quality in the world’s largest tropical lake 尼罗罗非鱼网箱养殖对世界最大热带湖泊水质的影响

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-04-02 DOI: 10.1016/j.jglr.2025.102576

John K. Okechi , Nick Peoples , Chrispine S. Nyamweya , Paul S. Orina , Michael S. Cooperman , Les Kaufman

{"title":"Effects of Nile tilapia (Oreochromis niloticus) cage aquaculture on water quality in the world’s largest tropical lake","authors":"John K. Okechi , Nick Peoples , Chrispine S. Nyamweya , Paul S. Orina , Michael S. Cooperman , Les Kaufman","doi":"10.1016/j.jglr.2025.102576","DOIUrl":"10.1016/j.jglr.2025.102576","url":null,"abstract":"<div><div>Cage aquaculture in tropical lakes is an efficient means of generating fish protein to ensure food security and support livelihoods. However, it has been repeatedly criticized as injurious to lake ecosystems due to eutrophication and other problems, and therefore ill-advised. This study examined the impacts of Nile tilapia (<em>Oreochromis niloticus</em>) cage farming on water quality across spatial scales in the world’s largest tropical lake, Lake Victoria. The primary objectives were to determine if water quality patterns differed between cage and control stations along a background limnological gradient, and to identify the water quality variables that contributed most to these differences. We postulated that the spatial arrangement of sites in the lake would drive overarching patterns of water quality variation, while cage aquaculture would have additional impacts on these parameters across the spatial gradient. Water column samples were collected from both cage and control stations at four locations along a known gradient in limnology, across 2 years. The results revealed significant differences in water quality between cage and control stations at all four sites, with dissolved oxygen, pH, and silica contributing the most to these differences. These findings highlight the need for site-specific management strategies to both mitigate the environmental impacts of cage aquaculture in tropical lakes and ensure continuity of aquaculture production. Our study provides an approach that can be applied to tropical lakes and reservoirs around the world. Effective nutrient management and continuous monitoring are recommended to support sustainable aquaculture in ecosystems under stress from growing lakeside populations.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102576"},"PeriodicalIF":2.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946572","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 convergence of salmonid isotopic niche in Lake Ontario 安大略湖鲑鱼同位素生态位的长期趋同

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-03-29 DOI: 10.1016/j.jglr.2025.102572

Emma J. Bloomfield, Timothy B. Johnson

{"title":"Long-term convergence of salmonid isotopic niche in Lake Ontario","authors":"Emma J. Bloomfield, Timothy B. Johnson","doi":"10.1016/j.jglr.2025.102572","DOIUrl":"10.1016/j.jglr.2025.102572","url":null,"abstract":"<div><div>Investigating niches through time to reveal species’ responses to ecological stressors is critical for successful resource management. Stable isotope analysis of archived fish scales provides a unique opportunity to retrospectively study species’ isotopic niches. We analysed the carbon and nitrogen stable isotopes of lake trout (<em>Salvelinus namaycush</em>), rainbow trout (<em>Oncorhynchus mykiss</em>), and Chinook salmon <em>(O. tshawytscha)</em> from Lake Ontario in 1975, 1991, 2001, 2013, and 2019 to investigate how salmonids’ isotopic niche position and similarity have changed over time. These years capture major stressors, including phosphorus control, dreissenid mussel establishment, and round goby establishment. We found long-term changes in the trophic ecology of Lake Ontario salmonids. The δ<sup>13</sup>C values were less negative in 2001 than 1991, indicating higher littoral benthic carbon reliance after dreissenid mussel establishment. Additionally, the δ<sup>15</sup>N values were lower in 2019 than earlier sampling years (1975 and/or 1991). Isotopic niche overlap between some salmonids was high (≥ 60 %) in 2013 and 2019, concurrent with a decline in the salmonid community carbon and nitrogen range. Lake Ontario salmonid isotopic niches have converged through time, suggesting energy sources for salmonids have become more similar. These changes may increase interspecific interactions between salmonids and reduce food web adaptive capacity. Our analyses affirm pervasive negative impacts of ecological stressors (invasive species and nutrient changes) that impact lakes worldwide.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102572"},"PeriodicalIF":2.4,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946568","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

Diet patterns differ between naturally- and hatchery-produced lake trout across life stages 在整个生命阶段，自然养殖的湖鳟鱼和人工养殖的湖鳟鱼的饮食模式是不同的

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-03-27 DOI: 10.1016/j.jglr.2025.102570

Matthew H. Futia , Jacques Rinchard , J. Ellen Marsden

{"title":"Diet patterns differ between naturally- and hatchery-produced lake trout across life stages","authors":"Matthew H. Futia , Jacques Rinchard , J. Ellen Marsden","doi":"10.1016/j.jglr.2025.102570","DOIUrl":"10.1016/j.jglr.2025.102570","url":null,"abstract":"<div><div>Hatchery-reared fish often have behaviors suited for hatchery conditions and can maintain those behaviors after being stocked in natural environments. Diet-related behaviors that differ between stocked and wild fish can include feeding patterns and prey selection. Most comparisons of stocked and wild fish diets have evaluated patterns for short periods (<1 year) after stocking or focused on juvenile behaviors. Here, we tested the hypothesis that hatchery rearing has lifetime effects on foraging success and diet composition by comparing diet patterns between stocked and wild lake trout (<em>Salvelinus namaycush</em>) in Lake Champlain across sizes that include juveniles and adults. Lake trout foraging success was assessed using lipid content and stomach content analyses, including frequency of empty stomachs, stomach fullness by count, and reconstructed mass of prey fish consumed. Diet composition was evaluated using frequency of occurrence for each prey item and fatty acid profiles. Stocked lake trout consumed significantly fewer prey fish by count (27 % average modeled reduction) and had significantly lower lipid content (21 % average modeled reduction) compared to wild fish across all sizes. Stocked fish also tended to have empty stomachs more frequently (19 % average modeled increase) and lower reconstructed mass of prey fish consumed (25 % average modeled reduction) compared to wild fish. Diet composition was similar, however, between stocked and wild fish with most lake trout primarily consuming alewife (<em>Alosa pseudoharengus</em>). Together, these results suggest that the population of stocked lake trout (juveniles and adults) had lower foraging success and energy consumption compared to wild fish.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 3","pages":"Article 102570"},"PeriodicalIF":2.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946570","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