Zukhuridin Juraev, Ilkhomon Urinboev, Husniddin Esanov, Feruz Akbarov, Gulkhayo Gafurova, Bobur Karimov, Inom Juramurodov, Nazokat Daminova, Kimyo Aslonova, Dilmurod Makhmudjanov, Komiljon Sh. Tojibaev

The first comprehensive assessment at the Central Asian scale of the phylogenetic diversity of urban floras in the arid and temperate regions of Uzbekistan

Introduction

The first comprehensive assessment at the central asian scale of the phylogenetic diversity of urban floras in the arid and temperate regions of uzbekistan. Assess urban flora phylogenetic diversity in Uzbekistan's arid & temperate regions. Reveals how urbanization shapes evolutionary dynamics: ecological filters vs. "phylogenetic release."

Abstract

Although urbanization is recognized as a major driver of biodiversity change globally, its impact on the evolutionary history of flora in arid regions remains understudied. This study provides a comparative analysis of the phylogenetic structure of the floras of three major cities in Uzbekistan Tashkent, Fergana, and Bukhara, located in different climatic zones. Species richness, phylogenetic diversity (Faith’s PD), and phylogenetic structure indices (MPD and SES.MPD) were employed in the study. The results indicated that while urbanization leads to an increase in species diversity across all cities due to alien species, the phylogenetic structure differs sharply depending on the regional climate. In the temperate cities of Tashkent and Fergana, the urban environment was observed to act as a harsh "ecological filter", resulting in strong phylogenetic clustering among alien species. In contrast, a distinct mechanism the "Phylogenetic Release" phenomenon was identified in the arid city of Bukhara. Here, anthropogenic maintenance mitigates natural stress factors, allowing the urban environment to act as a "facilitator" and enabling the persistence of evolutionarily diverse species. This study demonstrates that urbanization in arid regions can alter the evolutionary dynamics of flora and highlights the necessity of considering local climatic characteristics when creating sustainable urban ecosystems.

Review

This study provides a timely and significant contribution to our understanding of urban floras, particularly in understudied arid regions of Central Asia. By conducting the first comprehensive assessment of phylogenetic diversity in three major Uzbek cities spanning different climatic zones, the authors address a critical knowledge gap regarding how urbanization impacts evolutionary history in non-temperate environments. The research clearly demonstrates that while alien species consistently boost overall species richness in urban settings, the underlying phylogenetic structure differs sharply, offering nuanced insights into the ecological and evolutionary processes at play in these rapidly changing landscapes. A major strength of this work lies in its robust comparative methodology, employing a suite of phylogenetic metrics to reveal distinct ecological mechanisms. The identification of a strong "ecological filter" leading to phylogenetic clustering in temperate cities (Tashkent and Fergana) aligns with established ecological theory. However, the conceptualization and evidence for "Phylogenetic Release" in the arid city of Bukhara is particularly novel and impactful. This phenomenon, where anthropogenic maintenance alleviates natural stressors and acts as a "facilitator" for evolutionarily diverse species, challenges conventional narratives of urban environments solely as selective pressures, highlighting the complex and context-dependent nature of urban biodiversity dynamics. The findings carry substantial implications for sustainable urban planning and conservation, particularly as global urbanization intensifies and arid regions expand. By illustrating how urbanization can fundamentally alter the evolutionary trajectory of flora based on local climate, the study underscores the necessity of considering regional characteristics when designing green infrastructure. Future research could further explore the specific anthropogenic interventions that drive "Phylogenetic Release" and investigate its long-term consequences for ecosystem services and resilience in arid urban environments, potentially offering practical guidelines for cultivating biodiversity in water-stressed cities worldwide.

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