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- Viljur, Mari-Liis, et al.
(author)
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The effect of natural disturbances on forest biodiversity : an ecological synthesis
- 2022
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In: Biological Reviews. - : Wiley. - 1464-7931 .- 1469-185X. ; 97:5, s. 1930-1947
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Journal article (peer-reviewed)abstract
- Disturbances alter biodiversity via their specific characteristics, including severity and extent in the landscape, which act at different temporal and spatial scales. Biodiversity response to disturbance also depends on the community characteristics and habitat requirements of species. Untangling the mechanistic interplay of these factors has guided disturbance ecology for decades, generating mixed scientific evidence of biodiversity responses to disturbance. Understanding the impact of natural disturbances on biodiversity is increasingly important due to human-induced changes in natural disturbance regimes. In many areas, major natural forest disturbances, such as wildfires, windstorms, and insect outbreaks, are becoming more frequent, intense, severe, and widespread due to climate change and land-use change. Conversely, the suppression of natural disturbances threatens disturbance-dependent biota. Using a meta-analytic approach, we analysed a global data set (with most sampling concentrated in temperate and boreal secondary forests) of species assemblages of 26 taxonomic groups, including plants, animals, and fungi collected from forests affected by wildfires, windstorms, and insect outbreaks. The overall effect of natural disturbances on α-diversity did not differ significantly from zero, but some taxonomic groups responded positively to disturbance, while others tended to respond negatively. Disturbance was beneficial for taxonomic groups preferring conditions associated with open canopies (e.g. hymenopterans and hoverflies), whereas ground-dwelling groups and/or groups typically associated with shady conditions (e.g. epigeic lichens and mycorrhizal fungi) were more likely to be negatively impacted by disturbance. Across all taxonomic groups, the highest α-diversity in disturbed forest patches occurred under moderate disturbance severity, i.e. with approximately 55% of trees killed by disturbance. We further extended our meta-analysis by applying a unified diversity concept based on Hill numbers to estimate α-diversity changes in different taxonomic groups across a gradient of disturbance severity measured at the stand scale and incorporating other disturbance features. We found that disturbance severity negatively affected diversity for Hill number q = 0 but not for q = 1 and q = 2, indicating that diversity–disturbance relationships are shaped by species relative abundances. Our synthesis of α-diversity was extended by a synthesis of disturbance-induced change in species assemblages, and revealed that disturbance changes the β-diversity of multiple taxonomic groups, including some groups that were not affected at the α-diversity level (birds and woody plants). Finally, we used mixed rarefaction/extrapolation to estimate biodiversity change as a function of the proportion of forests that were disturbed, i.e. the disturbance extent measured at the landscape scale. The comparison of intact and naturally disturbed forests revealed that both types of forests provide habitat for unique species assemblages, whereas species diversity in the mixture of disturbed and undisturbed forests peaked at intermediate values of disturbance extent in the simulated landscape. Hence, the relationship between α-diversity and disturbance severity in disturbed forest stands was strikingly similar to the relationship between species richness and disturbance extent in a landscape consisting of both disturbed and undisturbed forest habitats. This result suggests that both moderate disturbance severity and moderate disturbance extent support the highest levels of biodiversity in contemporary forest landscapes.
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| 2. |
- Goniewicz, K., et al.
(author)
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The Moral, Ethical, Personal, and Professional Challenges Faced by Physicians during the COVID-19 Pandemic
- 2022
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In: International Journal of Environmental Research and Public Health. - : MDPI AG. - 1660-4601. ; 19:9
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Journal article (peer-reviewed)abstract
- The COVID-19 pandemic, apart from the main problems concerning the health and life of patients, sparked a discussion about physicians' moral and social professional attitudes. During a pandemic, physicians have the same ethical, moral, and medical responsibilities, however, the situation is different since they are self-exposed to a danger, which may influence their willingness to work. The problem of the professional moral attitudes of health care workers, recurring in ethical discussions, prompts us to define the limits of the duties of physicians in the event of a pandemic, hence this research aimed to assess these duties from an ethical perspective and to define their boundaries and scope. The study was conducted in May and June 2020 in the city of Lublin, covering all medical centers, and the questionnaire was completed by 549 physicians. The research was conducted in four areas: emergency standby in the event of a disaster, even if it is not requested; willingness to work overtime in the event of a disaster, even without payment; willingness to take health risks by caring for people who are infectious or exposed to hazardous substances; readiness to be transferred to other departments in the event of a disaster. Although most of the respondents declared to be agreed on personal sacrifices in the performance of professional duties, they were not prepared for a high level of personal risk when working in a pandemic. Excessive workload, its overwhelming nature, and personal risk are not conducive to readiness to work overtime, especially without pay. Research shows how important it is to respect the rights and interests of all parties involved in a pandemic. Physicians' duty to care for a patient is also conditioned by the duty to protect themselves and should not be a tool for intimidating and depersonalizing their social and professional lives.
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