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    Assessing Tree Species for Monitoring and Mitigating Strontium Pollution in Urban Environments
    (Springer Int Publ Ag, 2025) Kulac, Semsettin; Pulatoglu, Ayse Ozturk; Koc, Ismail; Sevik, Hakan; Ozel, Halil Baris
    Air pollution, particularly heavy metal contamination, has emerged as a critical global issue, posing significant human and environmental health risks over the past century. Strontium (Sr), a highly hazardous heavy metal, even at small concentrations, is classified as a priority contaminant by international organizations due to its potential adverse effects. This study aimed to specify the most appropriate plant species for observing and mitigating Sr contamination. Samples were collected from Pseudotsuga menziesii (Douglas fir), Tilia tomentosa (Silver linden), and Fraxinus excelsior (European ash or common ash) growing in D & uuml;zce, T & uuml;rkiye, one of the five most unclean towns in European countries according to the 2021 World Air Pollution Report. Variations in Sr concentrations over the past 60 years were analyzed based on tree species, tree organs, direction, and age group. The findings reveal that these species are unsuitable as biomonitors for tracking Sr pollution trends. However, all three species demonstrated the ability to accumulate significant levels of Sr in their wood, making them viable candidates for phytoremediation efforts. Among the species studied, European ash trees were the most effective in reducing Sr contamination, with the highest Sr accumulation in wood (11.36 mg/kg).
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    Climate-Driven Shifts in Wild Cherry (Prunus avium L.) Habitats in Türkiye: A Multi-Model Projection for Conservation Planning
    (Mdpi, 2025) Canturk, Ugur; Koc, Ismail; Erdem, Ramazan; Pulatoglu, Ayse Ozturk; Donmez, Sevgi; Ozkazanc, Nuri Kaan; Sevik, Hakan
    Climate change poses a serious threat to biodiversity, particularly for woody species with limited dispersal capacity such as Prunus avium L. (wild cherry). In this study, we assessed potential shifts in its suitable distribution range (SDR) across T & uuml;rkiye by applying an ensemble modeling framework that combined Generalized Additive Models (GAM), Maximum Entropy (MaxEnt), and Random Forest (RF). We used updated occurrence data (including GBIF and EUFORGEN records) and 11 ecologically relevant bioclimatic variables under SSP2-4.5 and SSP5-8.5 scenarios. Model performance was validated using AUC (Area Under the ROC Curve) and TSS (True Skill Statistic) metrics. Results suggest that while 60-70% of current SDRs remain stable by 2100, approximately 10% may be lost, with 20-23% new expansions. Temperature seasonality (Bio4) and seasonal precipitation (Bio15) were consistently identified as dominant predictors across models. Notably, newly suitable habitats are expected to be spatially isolated, limiting natural colonization. Our findings highlight the necessity of proactive conservation planning, including assisted migration and drought-resistant genotype selection, to ensure long-term persistence of wild cherry under changing climates. These results offer actionable insights for adaptive forest management and biodiversity conservation in Mediterranean-type ecosystems.
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    Using Trees to Monitor Airborne Cr Pollution: Effects of Compass Direction and Woody Species on Cr Uptake during Phytoremediation
    (North Carolina State Univ Dept Wood & Paper Sci, 2025) Pulatoglu, Ayse Ozturk; Koc, Ismail; Ozel, Halil Baris; Sevik, Hakan; Yildiz, Yafes
    Among the heavy metals (HMs) whose concentrations in natural environments have risen considerably in the last era, chromium (Cr) is one of the most toxic. Because of the risks it poses to human and environmental health, it is of great importance to screen the variation in Cr contamination in the atmosphere and decrease the pollution. This study aimed to determine the proper tree species that can be used to monitor and reduce Cr contamination. For this aim, studies were conducted on Tilia tomentosa, Robinia pseudoacacia, Cedrus atlantica, Pseudotsuga menziesii, and Fraxinus excelsior species growing in D & uuml;zce, which is among the 5 most contaminated European towns according to the World Air Pollution report. Samples taken from these trees were examined, and changes in Cr concentration depending on species, organs, compass direction, and age range in the last 60 years were evaluated. Results indicated higher Cr pollution in recent years, consistent with higher traffic density, but that there was no consistent effect of compass direction. It was also determined that the tree species most appropriate for screening the variation in Cr contamination in the airborne were Tilia tomentosa, and the most appropriate species for decreasing pollution were Robinia pseudoacacia and Cedrus atlantica.