Lockdown severity is positively associated with poor mental health.• Nature contact 'buffers' the negative effect of lockdown on mental health. • People perceived that nature helped them to cope better with lockdown measures. • Access to outdoor spaces and nature views associated with more positive emotions.

Climate and land-use change drive a suite of stressors that shape ecosystems and interact to yield complex ecological responses, i.e. additive, antagonistic and synergistic effects.Currently we know little about the spatial scale relevant for the outcome of such interactions and about effect sizes. This knowledge gap needs to be filled to underpin future land management decisions or climate mitigation interventions, for protecting and restoring freshwater ecosystems. The study combines data across scales from 33 mesocosm experiments with those from 14 river basins and 22 cross-basin studies in Europe producing 174 combinations of paired-stressor effects on a biological response variable. Generalised linear models showed that only one of the two stressors had a significant effect in 39% of the analysed cases, 28% of the paired-stressor combinations resulted in additive and 33% in interactive (antagonistic, synergistic, opposing or reversal) effects. For lakes the frequency of additive and interactive effects was similar for all spatial scales addressed, while for rivers this frequency increased with scale. Nutrient enrichment was the overriding stressor for lakes, generally exceeding those of secondary stressors. For rivers, the effects of nutrient enrichment were dependent on the specific stressor combination and biological response variable. These results vindicate the traditional focus of lake restoration and management on nutrient stress, while highlighting that river management requires more bespoke management solutions.

No abstract

No abstract

There is growing evidence that exposure to the natural world (blue-green spaces) has potential benefits for mental health and well-being. The COVID-19 pandemic and the measures adopted to control it provide a natural experiment to investigate the links between nature exposure and mental health under extreme conditions. Using a survey distributed online and based on 6,080 responses, we tested three hypotheses: (1) people will show different levels of symptoms of depression and anxiety depending on the level of lockdown (severity) and ability to maintain contact with outdoor spaces; and (2) where access to outdoor public spaces was restricted, those with access to private outdoor spaces (2a) or even a green-blue nature view (2b) will show fewer symptoms of depression and anxiety and a more positive mood. Lockdown severity significantly affected mental health, while contact with nature helped people to cope with these impacts. The buffering effect of nature was especially relevant for those under strict lockdowns. People perceived that nature helped them to cope with lockdown measures; and emotions were more positive among individuals with accessible outdoor spaces and blue-green elements in their views. These findings can help decision-makers in developing potential future lockdown measures to mitigate the negative impacts, helping people to be more resilient and maintain better mental health.