Publications by authors named "Olaf Jensen"

Climate change is altering the thermal habitats of freshwater fish species. We analyze modeled daily temperature profiles from 12,688 lakes in the US to track changes in thermal habitat of 60 lake fish species from different thermal guilds during 1980-2021. We quantify changes in each species' preferred days, defined as the number of days per year when a lake contains the species' preferred temperature.

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Article Synopsis
  • The Landscape Theory of Food Web Architecture (LTFWA) explores how body size, trophic position, and energy channels interconnect in diverse habitats to maintain system stability, but evidence has been inconsistent across different ecosystems.
  • In a study of the Lake Michigan food web, researchers found a positive correlation between body size and trophic position, with variations based on whether species were supported by pelagic or benthic energy sources.
  • The findings indicated that while native top predators contribute to food web stability by connecting energy pathways, introduced species may disrupt this structure, highlighting the complex impacts of human activity on ecosystem dynamics.
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By integrating health coaching into maritime medical clinics, we can provide tailored support to individuals at risk of developing diabetes and empower them to take control of their health.

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Objectives: The aim of this study is to provide an updated overview of the oral health status and associated risk factors in maritime settings.

Methods: We systematically searched PubMed, Ovid Embase, Web of Science, CINAHL and SCOPUS from January 2010 to April 2023. Two independent reviewers extracted the data.

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  • Nearly 60 million people globally work in fishing and aquaculture, many of whom face specific allergens, yet little research has focused specifically on fishermen and their allergic diseases.
  • The study aimed to analyze the prevalence and main causes of allergic conditions, such as occupational asthma and skin disorders, among harvesting fishermen based on literature collected from various databases.
  • Out of 25 studies reviewed, most indicated that occupational asthma was primarily caused by allergens like crab and Anisakis simplex, while occupational eczema was notably linked to marine organisms, particularly among fishermen in North Sea and Channel regions.
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Declining body size is believed to be a universal response to climate warming and has been documented in numerous studies of marine and anadromous fishes. The Salmonidae are a family of coldwater fishes considered to be among the most sensitive species to climate warming; however, whether the shrinking body size response holds true for freshwater salmonids has yet to be examined at a broad spatial scale. We compiled observations of individual fish lengths from long-term surveys across the Northern Hemisphere for 12 species of freshwater salmonids and used linear mixed models to test for spatial and temporal trends in body size (fish length) spanning recent decades.

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Supervised by three or four medical doctors and one nurse in rotating shifts, the medical clinic in Costa Rica's Moín Container Terminal is open 24/7 for visits from port workers. In our study, we aimed to identify the sociodemographic and clinical characteristics of a consecutive series of patients who attended the medical clinic for outpatient services during an 8-month period. Our descriptive study involved collecting patient records from the medical clinic during the first 8 months of 2021 (i.

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Management regimes of marine resources that rely on spatial boundaries might be poorly adapted to climate change shifts in species distributions. This is of specific concern for the management of fish stocks that cross management jurisdictions, known as shared stocks. Transitioning to dynamic rules in spatial management has been suggested as a solution for mismatches between species distributions and the spatial boundaries.

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Background: The aims of the study are: 1) to replace the urine glucose test for diabetes with more than 50% false negatives, with an accurate screening for type 2 diabetes and hypertension in the mandatory biannual fit-for-duty medical examinations of seafarers; 2) to produce data driven "Green Ship" health pro-motion in the ships. A new health promotion and disease prevention public health intervention programme integrated in the fit-for-duty medical examinations for seafarers is being developed.

Materials And Methods: The lack of an accurate diagnosis of type 2 diabetes is replaced by accurate HbA1c and/or fasting glucose tests and the test for hypertension in various disease stages is based on the International Associations' Guidelines.

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Hydropower is a threat to freshwater fishes. Despite a recent boom in dam construction, few studies have assessed their impact on mega-diverse tropical rivers. Using a before-after study design, we investigated the early impacts of the Belo Monte hydroelectric complex, the third-largest hydropower project in the world, on fishes of the Xingu River, a major clear-water tributary of the lower Amazon.

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Transport workers, seafarers and fishers have biannual mandatory fit-for duty medical examinations. Urinedipstick is used for early diagnosis of Type 2 diabetes mellitus. Due to low sensitivity with more than 80% false negatives the method should be replaced by highly sensitive blood tests, Hb1Ac or similar for diagnosis of Type 2 diabetes mellitus to pursue the UN Global Sustainable Goals, especially Goal 3: Good health and well-being for all workers and Goal 8: Decent Work and Economic Growth.

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Transport workers like seafarers, truck-, bus-, train- and taxi drivers and fishers have a known great inequity in health at work including high risk of developing type 2 diabetes. Their routine mandatory medical examinations use urine glucose for diabetes check with more than 50% false negatives, which should be replaced by high sensitive tests for diabetes-2, like A1C, Fasting Glucose (FPG) or Oral Glucose Tolerance Test (OGTT).

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Introduction: Artisanal fisheries generally do not have injury prevention plans and safety or quality management systems on board, thus making them prone to more fatal and nonfatal injuries. The objective of the study is to systematically review and synthesize the literature to identify the risks of injuries (fatal and nonfatal) and health problems in artisanal fisheries in developing countries.

Methods: A systematic literature search was carried out from December 2019 to March 2020.

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The aim is to assess the prevalence and knowledge on acute occupational exposure to phosphine in the shipping industry. We followed PRISMA guidelines for scoping review. We searched in 4 databases without language and date restrictions for scientific articles in peer-reviewed and gray literature.

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Population genetic analyses can evaluate how evolutionary processes shape diversity and inform conservation and management of imperiled species. Taimen (Hucho taimen), the world's largest freshwater salmonid, is threatened, endangered, or extirpated across much of its range due to anthropogenic activity including overfishing and habitat degradation. We generated genetic data using high throughput sequencing of reduced representation libraries for taimen from multiple drainages in Mongolia and Russia.

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Occupational and Public Health Research has been developed gradually over the last century, unfortunately not to the same levels in all continental parts of the globe. The aim is to supply an open modular educational program in Occupational- and Public Health research methodology for research of the risk indicators for the prevention of workers' health and safety globally. The modular educational program in research methodology is based on the Humboldtian university model with unity of research and teaching.

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Background: Seafaring is a risky occupation with high prevalence of risk factors for non-communicable diseases. Food intake and eating habits are important cornerstones regarding health and health promotion. The aim of this study was to provide an overview of dietary intake and dietary intake assessment methods of seafarers and suggestions for applicable assessment tools.

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Seafarers are exposed to several physical and psychosocial stressors. Recent studies highlighted specific disorders as fatigue, boredom and diseases as depression. Seafarers are also commonly exposed to post-traumatic stress disorder (piracy, accidents, threats).

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Forage fish-small, low trophic level, pelagic fish such as herrings, sardines, and anchovies-are important prey species in marine ecosystems and also support large commercial fisheries. In many parts of the world, forage fish fisheries are managed using precautionary principles that target catch limits below the maximum sustainable yield. However, there are increasing calls to further limit forage fish catch to safeguard their fish, seabird, and marine mammal predators.

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Although different fisheries can be tightly linked to each other by human and ecosystem processes, they are often managed independently. Synchronous fluctuations among fish populations or fishery catches can destabilize ecosystems and economies, respectively, but the degree of synchrony around the world remains unclear. We analyzed 1,092 marine fisheries catch time series over 60 yr to test for the presence of coherence, a form of synchrony that allows for phase-lagged relationships.

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