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

Cyanobacteria in cold waters: A study of nearshore cyanobacteria assemblages in Lake Superior 冷水中的蓝藻：苏必利尔湖近岸蓝藻群研究

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.2024.102425

Kirill Shchapov , E. Todd Howell , Tara George , Sapna Sharma

{"title":"Cyanobacteria in cold waters: A study of nearshore cyanobacteria assemblages in Lake Superior","authors":"Kirill Shchapov , E. Todd Howell , Tara George , Sapna Sharma","doi":"10.1016/j.jglr.2024.102425","DOIUrl":"10.1016/j.jglr.2024.102425","url":null,"abstract":"<div><div>Cyanobacterial blooms, often associated with warm, eutrophic lakes, are of widespread concern owing to their potential disruption of ecological and public health. Recently, cyanobacterial blooms have been observed in oligotrophic lakes, including Lake Superior, a large cold-water system. Despite recent developments, limited research has targeted phytoplankton assemblages in the northern Lake Superior nearshore, where isolated cyanobacteria blooms have emerged since 2019. In 2019, the cyanobacteria assemblage at 10 nearshore monitoring stations was examined to understand potential bloom-forming taxa and their association with water quality. We observed a diverse cyanobacteria assemblage, with highest densities in spring and biomass in fall. <em>Pseudanabaena limnetica</em>, <em>Dolichospermum flos-aquae</em> and <em>Limnothrix</em> sp. were the most prevalent species across sites and seasons. Variation partitioning analysis revealed that water quality conditions were more influential drivers of cyanobacteria density and biomass than meteorological factors, particularly in regions with elevated nutrient inputs and following stormy conditions. However, at present, cyanobacteria compose <15 % of the total phytoplankton biomass in the study areas. Our monitoring data and recent reports of cyanobacteria blooms on the north shore, suggests that current blooms are not widespread. Nonetheless, we found a diverse array of cyanobacteria taxa, with most capable of producing cyanotoxins. Considering the global uncertainty in the factors contributing to cyanobacteria blooms, in association with the large-scale climatic changes affecting Lake Superior, a proactive approach to assessing risks of blooms is suggested. This should include data-generating efforts (e.g., frequent phytoplankton monitoring and reported blooms investigations) to support future collaborative initiatives focused on managing cyanobacterial blooms.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102425"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249744","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

Reducing bias in Coregonus artedi abundance estimates using stationary up-looking acoustics 减少偏差在Coregonus artedi丰度估计使用固定向上看声学

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.2024.102456

Ryan C. Grow , Eric Berglund , Friedrich Fischer , Michael D. Rennie

{"title":"Reducing bias in Coregonus artedi abundance estimates using stationary up-looking acoustics","authors":"Ryan C. Grow , Eric Berglund , Friedrich Fischer , Michael D. Rennie","doi":"10.1016/j.jglr.2024.102456","DOIUrl":"10.1016/j.jglr.2024.102456","url":null,"abstract":"<div><div>Mobile hydroacoustic surveys using ship-based down-looking transducers are widely used to estimate densities for ecologically and economically important pelagic fishes. However, this method likely underestimates densities of some surface-oriented species due to biases associated with the acoustic surface exclusion zone and ship avoidance behaviours. We compared cisco (<em>Coregonus artedi</em>) density estimates from a stationary up-looking platform survey to a standard down-looking acoustic survey. Both systems were deployed during the fall cisco spawn in Thunder Bay, Lake Superior 2020–2022. Cisco density estimates from the stationary up-looking platform were on average 6.7 times higher in the upper water column (∼1–10 m) and 2 times higher over the entire water column (∼1–45 m) than those from standard mobile surveys. Ship avoidance behaviour associated with mobile surveys was apparent in the upper water column; median cisco densities observed by the platform fell from ∼36 to ∼9 fish/ha when the ship passed near the platform. Abundance estimates from the platform when not influenced by ship avoidance provided higher quota estimates than the standard survey in 2020 and 2022, but were similar in 2021. A multi-day deployment of the platform tracked a progressive daily increase in fish densities, highlighting the sensitivity of mobile survey results to the day they are conducted, often dictated by environmental conditions. Our results show promise in applying stationary acoustic deployments in fisheries surveys, with improved accuracy and reduced effort compared to mobile acoustic surveys in the management and monitoring of pelagic fishes in the Great Lakes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102456"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129448","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

Seasonal population characteristics and gut contents of the invasive mysid, Hemimysis anomala, in Milwaukee Harbor, Lake Michigan 密根湖密尔瓦基港侵袭性粘蝇（Hemimysis anomala）的季节种群特征及肠道内容物

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.2024.102462

Sierra N. Wachala , John Janssen , Erica B. Young , John A. Berges

{"title":"Seasonal population characteristics and gut contents of the invasive mysid, Hemimysis anomala, in Milwaukee Harbor, Lake Michigan","authors":"Sierra N. Wachala , John Janssen , Erica B. Young , John A. Berges","doi":"10.1016/j.jglr.2024.102462","DOIUrl":"10.1016/j.jglr.2024.102462","url":null,"abstract":"<div><div>The invasive mysid, <em>Hemimysis anomala,</em> is abundant along harbor breakwalls in Lake Michigan, forming large swarms, but we know little of its population dynamics or diet in these novel environments. We examined abundance, body length, and sex/developmental stage in animals collected using lighted funnel traps in Milwaukee Harbor, WI, from summer 2021 to spring 2022. We applied novel immunochemical analysis to examine gut contents using purified polyclonal antisera raised against nine putative zooplankton prey (<em>Bosmina longirostris, Bythotrephes longimanus</em>, <em>Cercopagis pengoi</em>, <em>Daphnia galataea mendotae</em>, <em>Daphnia pulex, Dreissena</em> veliger larvae, <em>Keratella cochlearis</em>, <em>Leptodiaptomus ashlandii,</em> and <em>Limnocalanus macrurus</em>). Population dynamics differed from those described in other Great Lakes; mid-late summer populations were dominated by juveniles (< 6 mm), and small (∼7 mm) adult males (80–90 %) with few reproductive females (5–10 %). Males did not die after reproducing and adults grew through winter (0.011–0.015 mm d<sup>−1</sup>), reaching 10–12 mm by early spring. Immunochemical gut analyses showed <em>Hemimysis</em> to be generalist feeders, consuming all nine species tested. Most trapped individuals (58 %) had empty guts, suggesting that <em>Hemimysis</em> cleared their guts before recovery<em>.</em> No differences in diet were seen among sexes/developmental stages, or across seasons. We also compared <em>Hemimysis</em> directly sampled from pelagic swarms, to those recovered from benthic traps. There were no differences in size or sex/developmental stage of individuals between traps and swarm populations, refuting the idea that swarming serves a reproductive function, but there were differences in prey found in guts between individuals in swarms and from traps, suggesting swarming is associated with feeding.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102462"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129452","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

Genetic pedigree analyses of Arctic grayling offspring produced to initiate the Michigan reintroduction program 为启动密歇根放归计划而生产的北极灰鲑后代的遗传谱系分析

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.2024.102492

Kim T. Scribner , Jeannette Kanefsky , Nicholas Sard , Dan Sampson

{"title":"Genetic pedigree analyses of Arctic grayling offspring produced to initiate the Michigan reintroduction program","authors":"Kim T. Scribner , Jeannette Kanefsky , Nicholas Sard , Dan Sampson","doi":"10.1016/j.jglr.2024.102492","DOIUrl":"10.1016/j.jglr.2024.102492","url":null,"abstract":"<div><div>Measures of genetic diversity among individuals within and between broodstock year classes of Arctic Grayling (<em>Thymallus arcticus</em>) were quantified as part of a large inter-disciplinary effort to repatriate the species into Michigan fluvial habitats. Genetic pedigree analysis of 200 juveniles from each of the 2019 and 2021 year classes indicated that 205 and 218 adults from a natural stream population in central Alaska contributed to offspring genotyped. Because broodstock sampling occurred in the same stream location each year and adults were not marked, 22.4 % of successful adults were estimated to have contributed to offspring genotyped in both years, indicating that the local adult population was philopatric to the spawning site and of moderate size. Measures of genetic <u>diversity</u> including heterozygosity and allelic diversity were high, while inbreeding coefficients (F<sub>IS</sub>), and estimates of inter-individual relatedness (R<sub>XY</sub>) of offspring genotyped within and between year classes were low. Collectively, results indicate that crosses conducted among adults to establish broodstock year classes had achieved restoration program goals of creating a genetically diverse domestic broodstock to use for future repatriation efforts.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102492"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129457","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

Spatiotemporal dynamics of cyanobacterium Dolichospermum lemmermannii populations in a bloom-prone region of Lake Superior 苏必利尔湖水华易发区蓝藻种群的时空动态

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.2024.102455

Andrew W. Wood , Jake D. Callaghan , Reane Loiselle , Robert M. McManus , Sandra S. Brovold , Holly A. Wellard Kelly , Elizabeth E. Alexson , Robert W. Sterner , Matthew J. Hudson , Cody S. Sheik

{"title":"Spatiotemporal dynamics of cyanobacterium Dolichospermum lemmermannii populations in a bloom-prone region of Lake Superior","authors":"Andrew W. Wood , Jake D. Callaghan , Reane Loiselle , Robert M. McManus , Sandra S. Brovold , Holly A. Wellard Kelly , Elizabeth E. Alexson , Robert W. Sterner , Matthew J. Hudson , Cody S. Sheik","doi":"10.1016/j.jglr.2024.102455","DOIUrl":"10.1016/j.jglr.2024.102455","url":null,"abstract":"<div><div>Cyanobacterial Harmful Algal Blooms (cHABs) are increasingly common in marine and freshwater environments, including the Laurentian Great Lakes (LGL). Lake Superior has seen two large-scale cyanobacterial blooms (2012 and 2018) along the Wisconsin shoreline west of the Apostle Islands, caused by the cyanobacterium <em>Dolichospermum lemmermannii.</em> The drivers of bloom formation in Lake Superior are not yet certain, with many factors known to trigger blooms elsewhere in the LGL being absent in Lake Superior. Furthermore, little is known about <em>D. lemmermannii</em>’s spatial structure or phenology. Thus, we sought to track the seasonal population dynamics of <em>D. lemmermannii</em> to shed light on its growth, physiology, and abundance. In 2021, we used 16S rRNA amplicon and shotgun metagenomic sequencing to characterize spatiotemporal patterns of <em>D. lemmermannii</em> abundance and diversity along the bloom-prone Wisconsin shore of Lake Superior. In 2022, we performed net tows and direct colony counts in another localized area. No large-scale bloom event was observed during either year, though several smaller localized blooms were observed. <em>D. lemmermannii</em> abundances were low at nearly all sites and sampling times. Spikes in abundance occurred in July and September, particularly near Siskiwit Bay, a hotspot of bloom formation. We also observed a seasonal shift in heterocyte and akinete abundance indicative of late-season nutrient limitation. Most striking was the seasonal turnover of <em>D. lemmermannii</em> strains, suggesting strain adaptation to specific environmental conditions. These results offer valuable and actionable insights for managers and provide a foundation for additional work to clarify drivers of bloom formation in Lake Superior.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102455"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129596","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

LiDAR-derived measurements of rapid coastal change along Wisconsin’s Lake Superior coast (2009–2019) 威斯康星州苏必利尔湖沿岸海岸快速变化的激光雷达测量结果（2009-2019 年）

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.2024.102366

C.J. Roland, L.K. Zoet

{"title":"LiDAR-derived measurements of rapid coastal change along Wisconsin’s Lake Superior coast (2009–2019)","authors":"C.J. Roland, L.K. Zoet","doi":"10.1016/j.jglr.2024.102366","DOIUrl":"10.1016/j.jglr.2024.102366","url":null,"abstract":"<div><div>Coastal landscapes are highly dynamic, and comprehensive measurements of morphological change are important for improved coastal management. Past assessments of morphological change along Wisconsin’s Lake Superior coast were limited in either their spatial coverage or their ability to incorporate three-dimensional changes due to their reliance on 2D transect-based or plan-form measurements. Here, we quantified erosion and deposition for 74 km of Wisconsin’s Lake Superior coastline using airborne LiDAR data collected in 2009 and 2019, spanning a transition from below-average to near-record water elevations. We used open-source methods to generate new 1-m resolution DEM’s and semi-automatically delineated bluff toes and crests. The study reach experienced 3.03 ± 0.59 <span><math><mo>×</mo></math></span> 10<sup>6</sup> m<sup>3</sup> of net erosion, corresponding to a normalized mean erosion rate of 3.9 m<sup>3</sup> yr<sup>−1</sup> per m of coastline. The mean bluff toe retreated 6.8 ± 5.6 m over this time period (0.7 ± 0.4 m yr<sup>−1</sup>), while the mean bluff crest retreated 2.9 ± 5.7 m over this time period (0.3 ± 0.4 m yr<sup>−1</sup>), leading to widespread bluff steepening. Coastal erosion rates exhibited a strong lithological dependence, with sandier bluffs losing 7.0 ± 4.9 m<sup>3</sup> yr<sup>−1</sup> per m of coastline while more clay-rich bluffs eroded at a rate of 3.2 ± 2.3 m<sup>3</sup> yr<sup>−1</sup> per m of coastline. Aggradational reaches were limited to Wisconsin Point. Our findings indicate that Wisconsin’s Lake Superior coast is eroding at rates similar to other soft coastal cliff systems and there is substantial spatial variability in erosion rates. As of 2019, bluff slopes had increased and bluff crest retreat is expected to continue to achieve stable slope angles.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102366"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141050419","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

Network of nearshore protected areas provides important benefits to lake whitefish in the Apostle Islands region of Lake Superior 近岸保护区网络为苏必利尔湖阿波斯特尔群岛地区的湖白鲑带来重要益处

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.2024.102338

Dray D. Carl , Scott A. Sapper , Michael J. Seider

{"title":"Network of nearshore protected areas provides important benefits to lake whitefish in the Apostle Islands region of Lake Superior","authors":"Dray D. Carl , Scott A. Sapper , Michael J. Seider","doi":"10.1016/j.jglr.2024.102338","DOIUrl":"10.1016/j.jglr.2024.102338","url":null,"abstract":"<div><div>Aquatic protected areas are commonly used for fish conservation, restoration, and management and a spectrum of protection levels exist in the Great Lakes. Using fishery-independent survey data over 43 years, we evaluated whether lake whitefish (<em>Coregonus clupeaformis</em>) population dynamics differed among nearshore partially protected areas (PPAs; commercial fishing prohibited or severely limited), offshore no-take refuges, and unprotected areas in the Apostle Islands region of Lake Superior. Lake whitefish biomass and recruitment to the spawning stock increased at faster rates in nearshore PPAs and offshore refuges than unprotected areas during the initial phase after protected areas were established (1980–2000). Recruitment and biomass stabilized in all management areas in the post-rebuild phase (2002–2022), and mortality was lower in the nearshore PPAs. Mean size of adults decreased within protected areas as abundance increased but not in unprotected areas, suggesting a density-dependent growth response and spillover to the fishing grounds, which was reflected in commercial catch rates. However, nearshore PPAs still harbored larger, faster-growing, and earlier-maturing lake whitefish, likely due to underlying habitat differences. Tag recaptures indicated greater minimum distances traveled near an offshore refuge compared to a nearshore PPA, suggesting habitat gradients may influence boundary porosity. PPAs provided protection and benefits for lake whitefish in areas of higher vulnerability where ceasing all fishing was not reasonable. Great Lakes managers should consider implementing networks of protected areas across multiple habitats as tools for conserving spawning biomass, maintaining diverse population demographics, and preserving portfolio effects to enhance recruitment and population stability.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102338"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140402269","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

Rehabilitation progress can’t be assessed without a measuring stick: Development of a recruitment index survey for lake sturgeon in Lake Superior 康复进度不能没有标尺来评估：苏必利尔湖鲟鱼招募指数调查的开发

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.2024.102460

Joshua T. Schloesser , Henry R. Quinlan , Thomas C. Pratt , Edward A. Baker

{"title":"Rehabilitation progress can’t be assessed without a measuring stick: Development of a recruitment index survey for lake sturgeon in Lake Superior","authors":"Joshua T. Schloesser , Henry R. Quinlan , Thomas C. Pratt , Edward A. Baker","doi":"10.1016/j.jglr.2024.102460","DOIUrl":"10.1016/j.jglr.2024.102460","url":null,"abstract":"<div><div>Lake sturgeon <em>Acipenser fulvescens</em> remain a species of conservation concern in Lake Superior with a rehabilitation goal of maintaining spawning populations that are self-sustaining throughout their native range. The Lake Sturgeon Index Survey was developed to address rehabilitation research needs, determine rehabilitation progress, and monitor lake-wide and tributary-specific recruitment. Sampling with standardized gill nets occurred off the mouth of 19 known lake sturgeon spawning tributaries during 2011, 2016, and 2021. A target of 0.5 geometric mean catch per unit effort (CPUE) for cohort ages 4–8 was used as a quantitative recruitment indicator to determine progress towards Lake Superior’s Fish Community Objectives. In 2021, CPUE of the age 4–8 cohort met the target at the Bad, Ontonagon, Batchawana, Goulais, Michipicoten, and Pic/White rivers (7 of 19 locations), but was below target at the St. Louis, Montreal, North and South Entry Sturgeon, Pigeon, Kaministiquia, Black Sturgeon/Wolf, Nipigon, Gravel, Prairie, and Tahquamenon rivers. The Index Survey sampling design meets assessment needs by concentrating sampling effort near tributary mouths and by assessing recruitment over the age 4–8 cohort. Power analysis indicated that detecting a 50% change in CPUE was not likely at individual tributaries except Goulais River, but could detect recruitment changes when aggregated lake-wide. The Index Survey allows fishery managers to quantitatively measure recruitment for individual populations to inform evaluation or modification of rehabilitation efforts in a timely manner and help determine where rehabilitation efforts and funding should be focused.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102460"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129387","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

Using strain-specific genetic information to estimate the reproductive potential of lake trout spawning biomass in southern Lake Michigan 利用品系特异性遗传信息估计密歇根湖南部湖鳟鱼产卵生物量的生殖潜力

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.2024.102461

Mark P. Ebener , James R. Bence , Richard D. Clark Jr. , Kim T. Scribner

{"title":"Using strain-specific genetic information to estimate the reproductive potential of lake trout spawning biomass in southern Lake Michigan","authors":"Mark P. Ebener , James R. Bence , Richard D. Clark Jr. , Kim T. Scribner","doi":"10.1016/j.jglr.2024.102461","DOIUrl":"10.1016/j.jglr.2024.102461","url":null,"abstract":"<div><div>Lake trout reproduction has increased in Lake Michigan since the 2000 s. Previous genetic studies reported that the strains of stocked adults did not contribute equally to wild recruits. Consequently, reproductive potential of spawning biomass estimated in stock assessments will depend upon strain composition, complicating comparisons across time and space. We integrated data from a stock assessment with genetic data to estimate an effective lake trout spawning biomass that accounts for strain-specific reproductive efficiency. A reproductive power index (RPI) was developed for six strains of hatchery-reared lake trout using genetic data from lakes Michigan and Huron. The RPI is the ratio of the observed to expected genetic contribution of a strain to wild recruits. The Seneca Lake strain had the highest RPI, followed by Lake Manitou, Lewis Lake, Green Lake, Lake Superior, and Lake Huron strains. The RPI in southern Lake Michigan was 2.56 for Seneca Lake, 0.74 for Lake Superior, 0.50 for Lewis Lake, and 0.32 for Green Lake strains. Strain-specific effective spawning biomass in southern Lake Michigan was estimated using numbers stocked, population demographics from a stock assessment, and RPI to develop an annual effective spawning biomass index (ESBI) as a measure of reproductive potential. After 1996, ESBI increased faster than spawning biomass, and continued to increase when spawning biomass leveled off, reflecting the shift toward lake trout strains with higher RPI. The contribution to the ESBI after 2010 was 46 % Seneca Lake, 34 % wild adults, 12 % Lake Superior, and 4 % for the Lewis Lake and Green Lake strains.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102461"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129456","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

Spatial and inter-annual variation in the Lake Superior offshore zooplankton community 苏必利尔湖近海浮游动物群落的空间和年际变化

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.2024.102496

Julie E. Lietz , Richard P. Barbiero , Anne E. Scofield , Barry M. Lesht

{"title":"Spatial and inter-annual variation in the Lake Superior offshore zooplankton community","authors":"Julie E. Lietz , Richard P. Barbiero , Anne E. Scofield , Barry M. Lesht","doi":"10.1016/j.jglr.2024.102496","DOIUrl":"10.1016/j.jglr.2024.102496","url":null,"abstract":"<div><div>Lake Superior’s offshore zooplankton community is commonly considered spatially homogeneous and relatively invariant, and thus often referenced as a baseline oligotrophic zooplankton community for the Great Lakes. However, zooplankton biomass can indeed exhibit substantial variability in Lake Superior on finer spatial and temporal scales, but this is not well documented in the literature. We used long-term monitoring data generated by the Environmental Protection Agency’s Great Lakes Biology Monitoring Program from 1997 to 2018 to investigate offshore zooplankton community structure during summer stratification. Both cluster analysis and non-metric multidimensional scaling ordination were used to examine zooplankton spatial patterns in relation to environmental variables. In addition, we used modeled surface current projections for the weeks prior to sampling events to assess the potential importance of horizontal transport in shaping the offshore zooplankton community. We found that although calanoid copepods consistently dominated the community, the relative contribution of cladocerans to total zooplankton biomass was variable. Cluster analysis often singled out three stations, two north of Isle Royale and one offshore of the Pic River, that typically had both higher chlorophyll-a concentrations and higher cladoceran biomass than most others. Analysis of surface current projections suggested horizontal transport of zooplankton could occur from stations with high cladoceran biomass, possibly driving more widespread shifts in the offshore community than expected. Continued assessment of connections between physical and biological variables is important to anticipate food web responses to future stressors, such as climate-driven changes to temperature and circulation.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102496"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129451","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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