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Lakes are rapidly losing ice under global warming, but little is known about ice structure changes. Ice structure is a key regulator of ice stability and thus safety, affecting activities on ice. Here, we analysed spatial and temporal variations in ice structure across 21 Swedish lakes, spanning from 55 to 69 °N, and over five decades. We found regional differences in ice structure, with fastest changes occurring in southern Sweden. The stable clear ice layer was particularly sensitive to warming, showing a rapid decline. The number of days when temperatures exceeded the freezing point during the ice cover period was identified as a strong driver for how ice was structured. Since there is a high risk for increased occurrences of unsafe ice conditions under predicted air temperature changes, we recommend re-establishing ice structure monitoring programmes, informing society on the increased risks of being on ice and including ice structure to safety guidelines., (© 2024. The Author(s).)

Purpose: To improve survivorship in patients who have undergone curatively intended treatment for oesophageal cancer, we aimed to identify key targets for future patient-reported outcomes research. Methods: This nationwide Swedish prospective cohort study enrolled patients between 2014 and 2019 who had undergone surgical resection for oesophageal cancer 1 year earlier. Eight well-validated patient-reported outcome measures, including health-related quality of life, psychological status and sleep, were presented as proportions and mean scores (MS) with 95% confidence intervals (CIs). Results: Among 281 participants, approximately half of the patients reported problems associated with food intake such as eating restrictions (49%) and food aversion (47%). Other common problems were sleep (51%), fatigue (41%) and anxiety (36%). Fewer patients suffered from financial difficulties (9%), trouble swallowing saliva (4%) and hair loss (7%). However, these problems were perceived as highly burdensome on an individual level. Conclusions: This nationwide, population-based study indicates that symptom burden is high in oesophageal cancer survivors 1 year after surgery. The most common problems are associated with food intake, sleep, fatigue and anxiety. However, less frequent symptoms were sometimes more debilitating for the individual patient.

Bacterial respiration contributes to atmospheric carbon dioxide accumulation and development of hypoxia and is a critical, often overlooked, component of ecosystem function. This study investigates the concept that maintenance respiration is a significant proportion of bacterial respiration at natural nutrient levels in the field, advancing our understanding of bacterial living conditions and energy strategies. Two river-sea transects of respiration and specific growth rates were analyzed representing low- and high-productivity conditions (by in situ bacterial biomass production) in a subarctic estuary, using an established ecophysiological linear model (the Pirt model) estimating maintenance respiration. The Pirt model was applicable to field conditions during high, but not low, bacterial biomass production. However, a quadratic model provided a better fit to observed data, accounting for the maintained respiration at low μ. A first estimate of maintenance respiration was 0.58 fmol O 2 day -1 cell -1 by the quadratic model. Twenty percent to nearly all of the bacterial respiration was due to maintenance respiration over the observed range of μ (0.21-0.002 day -1 ). In the less productive condition, bacterial specific respiration was high and without dependence on μ, suggesting enhanced bacterial energy expenditure during starvation. Annual maintenance respiration accounted for 58% of the total bacterioplankton respiration based on μ from monitoring data. Phosphorus availability occasionally, but inconsistently, explained some of the remaining variation in bacterial specific respiration. Bacterial maintenance respiration can constitute a large share of pelagic respiration and merit further study to understand bacterial energetics and oxygen dynamics in the aquatic environment.