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<p>Urban habitat fragmentation poses critical challenges for biodiversity conservation. This study investigates two key biogeographic patterns – the small island effect (SIE) and nestedness – in bryophyte communities across 32 urban parks in Shanghai, China. Using multi-model inference and piecewise regression analysis with the Akaike Information Criterion (AICc), we identified SIE thresholds: 0.075 km<sup>2</sup> for total bryophytes, 0.0693 km<sup>2</sup> for mosses, 0.0686 km<sup>2</sup> for acrocarpous mosses, and 0.0829 km<sup>2</sup> for pleurocarpous mosses, while liverworts showed no threshold. Key drivers of SIE include stochastic disturbances, habitat diversity, and nutrient subsidies from precipitation. Nestedness analysis (NODF index) revealed strong area-dependency, with larger parks harboring richer communities. We propose prioritizing large parks as biodiversity reservoirs while implementing targeted conservation for small parks containing unique species. This work establishes an island biogeography-informed framework for urban bryophyte conservation.</p>

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Island biogeography in urban landscapes: small island effect and nestedness in bryophyte communities of urban parks in Shanghai, China

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Fumin Lei,
  • Yiyi Shan,
  • Dandan Li,
  • Xiangzhang Wu,
  • Jun Yang,
  • Shuiliang Guo,
  • Jing Yu

摘要

Urban habitat fragmentation poses critical challenges for biodiversity conservation. This study investigates two key biogeographic patterns – the small island effect (SIE) and nestedness – in bryophyte communities across 32 urban parks in Shanghai, China. Using multi-model inference and piecewise regression analysis with the Akaike Information Criterion (AICc), we identified SIE thresholds: 0.075 km2 for total bryophytes, 0.0693 km2 for mosses, 0.0686 km2 for acrocarpous mosses, and 0.0829 km2 for pleurocarpous mosses, while liverworts showed no threshold. Key drivers of SIE include stochastic disturbances, habitat diversity, and nutrient subsidies from precipitation. Nestedness analysis (NODF index) revealed strong area-dependency, with larger parks harboring richer communities. We propose prioritizing large parks as biodiversity reservoirs while implementing targeted conservation for small parks containing unique species. This work establishes an island biogeography-informed framework for urban bryophyte conservation.