( 2022 ) found that the bryophyte diversity in the Polish city of Wrocław showed a negative trend with variables related to increased urbanization, such as a lower NDVI (normalized difference vegetation index) and a higher UHI, among other factors influencing species diversity.
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Urban heat Islands shape epiphytic communities of lichens and bryophytes.
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The sentences
Despite the borderline non-significant influence of light availability on the biodiversity, we cannot discern a potential confounding effect of streetlamps on the epiphytic community.
For bryophytes only, diversity increased linearly with the UHI, but seemed to decline at higher UHI values, explaining the borderline significant second polynomial of the bryophyte GLMM. “DBH”, as a proxy of the age of a tree, was also a significant factor in explaining the diversity of all species, but not for lichens and bryophytes separately.
Nitrogen levels are generally still high in the Netherlands, although a decreasing trend in nitrogen pollution (from 2700 mol N/ha in 1990 to 1315 mol N/ha in 2023; Mijnen-Visser et al. 2025 ) and particulate matter (PM; Berkhout et al. 2024 ) is visible.