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Simple Summary: In 2020, many countries around the world went into lockdown to limit the spread of COVID-19, and many people substantially reduced their outdoor activity and began socially distancing to avoid infection. Such rapid and widespread changes in the lives of people all over the world must have an impact on the environment and wildlife. Most of the current pandemic–wildlife papers focus on changes in the movement and behavior of wild animals. These changes, although interesting and worth documenting, may be ephemeral and may not have any significant effect on wildlife in the long run; they may only show how our daily presence may limit the presence and behavior of animals. In this paper, we suggest that scientific interest should be directed toward more permanent changes in the functioning of wildlife. One such topic is the lower road mortality rates of animals during the lockdown. In this study, hedgehog roadkill levels during the lockdown were over 50% lower than in the pre-pandemic years. Reduced road mortality in the case of hedgehogs may mean tens of thousands of survivors nationwide. We hypothesize that this may result in a change in the demographic and genetic characteristics of the population of hedgehogs, and also help to stop the long-term decline in the number of hedgehogs in Europe. Globally, wildlife is affected by unprecedented changes related to the COVID-19 pandemic. In this paper, the lockdown effect on the traffic-related mortality in hedgehogs in an urban area was studied. Comparing the pre-pandemic (2018 and 2019) and pandemic (2020) years, we showed that hedgehog roadkill levels during the lockdown period were over 50% lower (which means a decrease greater than the decrease in road traffic in the same period measured by the number of accidents or the average number of vehicles per day). Based on literature data, we showed that this may mean at least tens of thousands of hedgehogs have survived on a national scale. We report the need to start intensive research on the possible demographic and genetic effects of this unique phenomenon. We also ask how stable the effect of the COVID-19 pandemic will be on wildlife and whether the lockdown (which is an anthropause) may reverse the negative trends in the decline in the number of wild species, including hedgehogs. [ABSTRACT FROM AUTHOR]

The recent COVID-19 pandemic affected various aspects of life. Several studies established the consequences of pandemic lockdown on air quality using satellite remote sensing. However, such studies have limitations, including low spatial resolution or incomplete spatial coverage. Therefore, in this paper, we propose a machine learning-based scheme to solve the pre-mentioned limitations by training an optimized space-time extra trees model for each year of the study period. The results have shown that our trained models reach a prediction accuracy up to 95% when predicting the missing values in the MODIS MCD19A2 Aerosol Optical Depth (AOD) product. The outcome of the mentioned scheme was a geo-harmonized atmospheric dataset for aerosol optical depth at 550 nm with 1 km spatial resolution and full coverage over Europe. As an application, we used the proposed machine learning based prediction approach in AOD levels analysis. We compared the mean AOD levels between the lockdown period from March to June in 2020 and the mean AOD values of the same period for the past 5 years. We found that AOD levels dropped over most European countries in 2020 but increased in several eastern and western countries. The Netherlands had the most significant average decrease in AOD levels (19%), while Spain had the highest average increase (10%). Moreover, we analyzed the relationship between the relative percentage difference of AOD and four meteorological variables. We found a positive correlation between AOD and relative humidity and a negative correlation between AOD and wind speed. The value of the proposed prediction scheme is further emphasized by taking into consideration that the reconstructed dataset can be used for future air quality studies concerning Europe. [ABSTRACT FROM AUTHOR]