4,568 results match your criteria populations lakes

Ecology of inorganic sulfur auxiliary metabolism in widespread bacteriophages.

Nat Commun 2021 06 9;12(1):3503. Epub 2021 Jun 9.

Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA.

Microbial sulfur metabolism contributes to biogeochemical cycling on global scales. Sulfur metabolizing microbes are infected by phages that can encode auxiliary metabolic genes (AMGs) to alter sulfur metabolism within host cells but remain poorly characterized. Here we identified 191 phages derived from twelve environments that encoded 227 AMGs for oxidation of sulfur and thiosulfate (dsrA, dsrC/tusE, soxC, soxD and soxYZ). Read More

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Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance.

Biol Lett 2021 Jun 9;17(6):20210137. Epub 2021 Jun 9.

School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK.

Insect abundance and diversity are declining worldwide. Although recent research found freshwater insect populations to be increasing in some regions, there is a critical lack of data from tropical and subtropical regions. Here, we examine a 20-year monitoring dataset of freshwater insects from a subtropical floodplain comprising a diverse suite of rivers, shallow lakes, channels and backwaters. Read More

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Genetic diversity of Nile tilapia (Oreochromis niloticus) populations in Ethiopia: insights from nuclear DNA microsatellites and implications for conservation.

BMC Ecol Evol 2021 Jun 7;21(1):113. Epub 2021 Jun 7.

Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences, Vienna, Gregor Mendel-Straße 33, 1180, Vienna, Austria.

Background: Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) is among the economically most important freshwater fish species in East Africa, and a major source of protein for local consumption. Human induced translocations of non-native stocks for aquaculture and fisheries have been found as a potential threat to the genetic diversity and integrity of local populations. In the present study, we investigate the genetic structure of O. Read More

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Coastal reservoirs as a source of nitrous oxide: Spatio-temporal patterns and assessment strategy.

Sci Total Environ 2021 May 21;790:147878. Epub 2021 May 21.

School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.

Coastal reservoirs are widely regarded as a viable solution to the water scarcity problem faced by coastal cities with growing populations. As a result of the accumulation of anthropogenic wastes and the alteration of hydroecological processes, these reservoirs may also become the emission hotspots of nitrous oxide (NO). Hitherto, accurate global assessment of NO emission suffers from the scarcity and low spatio-temporal resolution of field data, especially from small coastal reservoirs with high spatial heterogeneity and multiple water sources. Read More

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Plasticity of cold hardiness in the eastern spruce budworm, Choristoneura fumiferana.

Comp Biochem Physiol A Mol Integr Physiol 2021 May 31:110998. Epub 2021 May 31.

Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. Electronic address:

High latitude insect populations must cope with extreme conditions, particularly low temperatures. Insects use a variety of cold hardiness mechanisms to withstand this temperature stress, and these can drive geographic distributions through overwintering mortality. The degree of cold hardiness can be altered by two evolved responses: phenotypic plasticity and local adaptation. Read More

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The Hepatic Innovation Team Collaborative: A Successful Population-Based Approach to Hepatocellular Carcinoma Surveillance.

Cancers (Basel) 2021 May 7;13(9). Epub 2021 May 7.

Gastroenterology Section, VA Long Beach Healthcare System, 5901 E 7th Street, Long Beach, CA 90822, USA.

After implementing a successful hepatitis C elimination program, the Veterans Health Administration's (VHA) Hepatic Innovation Team (HIT) Collaborative pivoted to focus on improving cirrhosis care. This national program developed teams of providers across the country and engaged them in using systems redesign methods and population health approaches to improve care. The HIT Collaborative developed an Advanced Liver Disease (ALD) Dashboard to identify Veterans with cirrhosis who were due for surveillance for hepatocellular carcinoma (HCC) and other liver care, promoted the use of an HCC Clinical Reminder in the electronic health record, and provided training and networking opportunities. Read More

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Dynamics of Laterality in Relation to the Predator-Prey Interaction between the Piscivorous Chub "" and Its Prey "" in Lake Biwa.

Zoolog Sci 2021 Jun;38(3):231-237

Faculty of Engineering, Utsunomiya University, Utsunomiya, Tochigi 321-8585, Japan,

A Japanese piscivorous chub, "" (), and its main prey, "" (), both have laterally asymmetric bodies, similar to other fishes; each population consists of righty morphs and lefty morphs. This antisymmetric dimorphism has a genetic basis. Temporal changes in the ratios of laterality (i. Read More

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A classification framework for interspecific trade-offs in aquatic ecology.

Conserv Biol 2021 May 31. Epub 2021 May 31.

Great Lakes Laboratory for Fisheries and Aquatic Sciences, Fisheries and Oceans Canada, 867 Lakeshore Road, Burlington, Ontario, L7S 1A1, Canada.

The management of wildlife populations involves decision-making to fulfill management objectives. In some cases, management objectives for multiple species can conflict with one another, creating species trade-offs. Managers often face challenges in identifying and resolving these situations. Read More

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Strategies to Improve Delivery of Cirrhosis Care.

Curr Treat Options Gastroenterol 2021 May 24:1-11. Epub 2021 May 24.

Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Research Office Building (151R), University Drive C, Pittsburgh, PA 15240 USA.

Purpose Of Review: This review provides an overview of the current state of research around improving healthcare delivery for patients with cirrhosis in the outpatient, inpatient, and transitional care settings.

Recent Findings: Recent studies have broadly employed changes to the model of care delivery, team composition, and technology to improve cirrhosis care. In the outpatient setting, approaches have included engaging caregivers, patient navigators, and non-physicians and using virtual care, smartphone applications, and wearables. Read More

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Laboratory infection rates and associated mortality of juvenile Chinook Salmon (Oncorhynchus tshawytscha) from parasitic copepod (Salmincola californiensis).

J Fish Dis 2021 May 30. Epub 2021 May 30.

US Geological Survey, Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, USA.

Pacific salmon (Oncorhynchus spp.) rearing in lakes and reservoirs above dams have been known to become heavily infected with an ectoparasitic copepod (Salmincola californiensis). Little is known about the factors that affect the parasite infection prevalence and intensity. Read More

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The deep population history of northern East Asia from the Late Pleistocene to the Holocene.

Cell 2021 Jun 27;184(12):3256-3266.e13. Epub 2021 May 27.

Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing 100044, China; Shanghai Qi Zhi Institute, Shanghai 200232, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address:

Northern East Asia was inhabited by modern humans as early as 40 thousand years ago (ka), as demonstrated by the Tianyuan individual. Using genome-wide data obtained from 25 individuals dated to 33.6-3. Read More

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Genomic and immunogenic changes of Piscine novirhabdovirus (Viral Hemorrhagic Septicemia Virus) over its evolutionary history in the Laurentian Great Lakes.

PLoS One 2021 28;16(5):e0232923. Epub 2021 May 28.

Department of Biological Sciences, University of Toledo, Toledo, Ohio, United States of America.

A unique and highly virulent subgenogroup (-IVb) of Piscine novirhabdovirus, also known as Viral Hemorrhagic Septicemia Virus (VHSV), suddenly appeared in the Laurentian Great Lakes, causing large mortality outbreaks in 2005 and 2006, and affecting >32 freshwater fish species. Periods of apparent dormancy have punctuated smaller and more geographically-restricted outbreaks in 2007, 2008, and 2017. In this study, we conduct the largest whole genome sequencing analysis of VHSV-IVb to date, evaluating its evolutionary changes from 48 isolates in relation to immunogenicity in cell culture. Read More

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Life-history strategies in salmonids: the role of physiology and its consequences.

Biol Rev Camb Philos Soc 2021 May 27. Epub 2021 May 27.

Section for Freshwater Fisheries and Ecology, National Institute of Aquatic Resources, Technical University of Denmark, Vejlsøvej 39, Silkeborg, 8600, Denmark.

Salmonids are some of the most widely studied species of fish worldwide. They span freshwater rivers and lakes to fjords and oceans; they include short- and long-distance anadromous migrants, as well as partially migratory and non-migratory populations; and exhibit both semelparous and iteroparous reproduction. Salmonid life-history strategies represent some of the most diverse on the planet. Read More

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Muscular microsporidian infection in Arctic char Salvelinus alpinus from two lakes in Nunavik, Quebec, Canada.

Dis Aquat Organ 2021 May 27;144:209-220. Epub 2021 May 27.

Centre québécois sur la santé des animaux sauvages / Canadian Wildlife Health Cooperative, Faculté de médecine vétérinaire, Université de Montréal, St. Hyacinthe, Quebec J2S 2M2, Canada.

Arctic char Salvelinus alpinus is an important cultural and subsistence resource for Inuit communities. Muscular infections by microsporidia were diagnosed for the first time in Arctic char originating from 2 different lakes in Nunavik (Quebec, Canada). The consumption of these infected fish was associated with digestive tract disorders in people. Read More

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[Effects of Roxithromycin on Reproduction,Growth, and Anti-oxidation System of ].

Huan Jing Ke Xue 2021 Jun;42(6):3074-3083

Key Laboratory for Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.

Roxithromycin (ROX) is widespread in the water environment and has been reported to have ecotoxicological effects on aquatic organisms. To improve our understanding of these effects, we selected as a test organism to study acute and chronic ROX toxicity on reproduction, growth, and antioxidant systems. The acute ROX toxicity was low, with 48 h-LC and 96h-LCROX values of 60. Read More

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Mixed-stock analysis using Rapture genotyping to evaluate stock-specific exploitation of a walleye population despite weak genetic structure.

Evol Appl 2021 May 30;14(5):1403-1420. Epub 2021 Mar 30.

Aquatic Ecology Laboratory, Department of Evolution, Ecology, and Organismal Biology The Ohio State University Columbus OH USA.

Mixed-stock analyses using genetic markers have informed fisheries management in cases where strong genetic differentiation occurs among local spawning populations, yet many fisheries are supported by multiple, weakly differentiated stocks. Freshwater fisheries exemplify this problem, with many populations supported by multiple stocks of young evolutionary age and isolated across small spatial scales. Consequently, attempts to conduct genetic mixed-stock analyses of inland fisheries have often been unsuccessful. Read More

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Spatial and temporal genetic variation in an exploited reef fish: The effects of exploitation on cohort genetic structure.

Evol Appl 2021 May 10;14(5):1286-1300. Epub 2021 Feb 10.

Great Lakes Institute for Environmental Research (GLIER) University of Windsor Windsor Ontario Canada.

Many coral reef fishes are fished, often resulting in detrimental genetic effects; however, reef fishes often show unpredictable patterns of genetic variation, which potentially mask the effects of fishing. Our goals were to characterize spatial and temporal genetic variation and determine the effects of fishing on an exploited reef fish, , Lacepède (the common coral trout). To determine population structure, we genotyped 417 Great Barrier Reef coral trout from four populations sampled in 2 years (1996 and 2004) at nine microsatellite loci. Read More

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Anatomical adaptations and ionic homeostasis in aquatic halophyte L. Under high salinities.

Saudi J Biol Sci 2021 May 13;28(5):2655-2666. Epub 2021 Mar 13.

Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.

Salinity is extremely hazardous to agriculture worldwide and its expanding constantly. Soil of almost 100 countries facing salinity problem including Pakistan. also act as salinity indicator species is a naturally adapted halophyte dispersed in subtropical regions of world. Read More

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Infestation risk of the intermediate snail host of Schistosoma japonicum in the Yangtze River Basin: improved results by spatial reassessment and a random forest approach.

Infect Dis Poverty 2021 May 20;10(1):74. Epub 2021 May 20.

National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; Chinese Center for Tropical Diseases Research; WHO Collaborating Centre for Tropical Diseases; National Center for International Research on Tropical Diseases, Ministry of Science and Technology; NHC Key Laboratory of Parasite and Vector Biology, Shanghai, 200025, China.

Background: Oncomelania hupensis is only intermediate snail host of Schistosoma japonicum, and distribution of O. hupensis is an important indicator for the surveillance of schistosomiasis. This study explored the feasibility of a random forest algorithm weighted by spatial distance for risk prediction of schistosomiasis distribution in the Yangtze River Basin in China, with the aim to produce an improved precision reference for the national schistosomiasis control programme by reducing the number of snail survey sites without losing predictive accuracy. Read More

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The genomics of phenotypically differentiated Asellus aquaticus cave, surface stream and lake ecotypes.

Mol Ecol 2021 May 18. Epub 2021 May 18.

IFM Biology, University of Linköping, Linköping, Sweden.

Organisms well suited for the study of ecotype formation have wide distribution ranges, where they adapt to multiple drastically different habitats repeatedly over space and time. Here we study such ecotypes in a Crustacean model, Asellus aquaticus, a commonly occurring isopod found in freshwater habitats as diverse as streams, caves and lakes. Previous studies focusing on cave vs. Read More

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Evaluation of Absorbable Mesh for Prophylactic Mesh Augmentation in High-Risk Patients.

Surg Technol Int 2021 May 17;38. Epub 2021 May 17.

Department of Surgery, New Hanover Regional Medical Center, Wilmington, NC, USA.

Purpose: Hernia prevention following abdominal surgery has become a subject of growing interest in general surgery. Prophylactic mesh augmentation (PMA) is an emerging technique to prevent incisional hernia in high-risk populations. The aim of this study was to determine the efficacy and safety of PMA using an absorbable mesh. Read More

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Prokaryotic diversity and biogeochemical characteristics of field living and laboratory cultured stromatolites from the hypersaline Laguna Interna, Salar de Atacama (Chile).

Extremophiles 2021 May 16. Epub 2021 May 16.

Laboratorio de Microbiología y Biotecnología, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont #964, Independencia, Santiago, Chile.

Stromatolites are organo-sedimentary structures found principally in seas and saline lakes that contain sheets of sediments and minerals formed by layers of microbial communities, which trap sediments and induce the precipitation of minerals.A living stromatolite from the alkaline Laguna Interna in the Salar de Atacama was collected and one of the fragments was deposited in an experimental aquarium for 18 months. We used Illumina sequencing of PCR-amplified V4 regions of 16S rRNA genes from total extracted DNA to identify the microbial populations. Read More

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Has stocking contributed to an increase in the rod catch of anadromous trout (Salmo trutta L.) in the Shetland Islands, UK?

J Fish Biol 2021 May 15. Epub 2021 May 15.

College of Life and Environmental Sciences, Hatherly Building, University of Exeter, Exeter, UK.

The stocking of hatchery-origin fish into rivers and lakes has long been used in fisheries management to try to enhance catches, especially for trout and salmon species. Frequently, however, the long-term impacts of stocking programmes have not been evaluated. In this study, the authors investigate the contribution of a stocking programme undertaken to support the rod catch of sea trout in the Shetland Islands, UK. Read More

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Reply to "Re-evaluating the evidence for facilitation of stickleback speciation by admixture in the Lake Constance basin".

Nat Commun 2021 05 14;12(1):2807. Epub 2021 May 14.

Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.

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Toxigenic Microcystis aeruginosa (Cyanobacteria) affects the population growth of twocommon green microalgae. Evidence of other allelopathic metabolites different to cyanotoxins.

J Phycol 2021 May 14. Epub 2021 May 14.

Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas. Laboratorio de Hidrobiología Experimental. Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, CDMX, C.P. 11340, Mexico City, Mexico.

Agriculture runoffs and discharge of wastewaters are the major causes of eutrophication. Although eutrophication could promote the thriving of any phytoplankter, frequently harmful algal blooms (HABs) are dominated by cyanobacteria. Currently, HABs dominated by the toxigenic cyanobacterium Microcystis aeruginosa in lakes and reservoirs are the main environmental concerns worldwide. Read More

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Our experience of nursing/allied health practitioner led geriatric screening and assessment of older patients with cancer - a highly accessible model of care.

J Geriatr Oncol 2021 May 10. Epub 2021 May 10.

Metro North Hospital and Health Service, Australia; School of Medicine, University of Queensland, Australia.

Objective: Comprehensive Geriatric Assessment (CGA) has been proven to assist development of tailored treatment plans for older patients with cancer by identifying health issues affecting their ability to complete systemic therapy or cope with and recover from cancer treatment.

Materials And Methods: Metro North Hospital and Health Service (MNHHS) has significant older population with cancer. Geriatric Oncology services were commenced in February 2018 at two facilities of MNHHS [North Lakes Cancer Care Services/Caboolture Hospital (NLCCS/CBH) Cancer services and Redcliffe Hospital (RH) Cancer services]. Read More

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Songhua River basin's improving water quality since 2005 based on Landsat observation of water clarity.

Environ Res 2021 Aug 11;199:111299. Epub 2021 May 11.

Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China.

Water clarity, denoted by the Secchi disk depth (SDD), is one of the most important indicators for monitoring water quality. In the Songhua River basin (SHRB), few studies have used Landsat to monitor long-term (3-4 decades) changes in lake SDD and explore the impact of natural and human factors on SDD interannual variation at the watershed scale. Lakes in the SHRB are of great significance to local populations. Read More

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Nasal hyperkeratosis in Griffon breeds: Clinical, histopathological features and the prevalence in the Swedish population compared to a control group and other brachycephalic breeds.

Vet Rec Open 2021 Dec 5;8(1):e10. Epub 2021 May 5.

VetaDerm Veterinarklinik Lomma Sweden.

Background: In the Griffon breeds (GB) nasal hyperkeratosis is common and develops already in early adulthood. Breed-related features and prevalence have not previously been documented.

Hypothesis/objectives: To describe clinical and histopathological features of nasal hyperkeratosis in GB and to document the prevalence. Read More

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December 2021

Complete genomes derived by directly sequencing freshwater bloom populations emphasize the significance of the genus level ADA clade within the Nostocales.

Harmful Algae 2021 03 10;103:102005. Epub 2021 Mar 10.

Department of Microbiology, Oregon State University, 226 Nash Hall, Corvallis, OR 97331, USA.

The genome sequences of 16 Nostocales cyanobacteria have been determined. Most of them are complete or near-complete genome sequences derived by long-read metagenome sequencing of recent harmful algal blooms (HABs) in freshwater lakes without the potential bias of culture isolation. The genomes are all members of the recently recognized ADA clade (Driscoll et al. Read More

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Seven decades of southern range dynamics of Canada lynx.

Ecol Evol 2021 May 9;11(9):4644-4655. Epub 2021 Mar 9.

Environmental & Life Sciences Graduate Program Trent University Peterborough ON Canada.

The range of the Canada lynx () has contracted substantially from its historical range. Using harvest records, we found that the southern range of the lynx in Ontario in the late 1940s collapsed and then, in a short period of time, increased to its largest extent in the mid-1960s when the lynx range spread south of the boreal forest for a decade. After this expansion, the southern range contracted northwards beginning in the 1970s. Read More

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