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<p>In a context of global pollinator decline, characterizing the response of urban insects to the interplay between landscape composition, local habitat management, and microclimate, may inform management policies aimed at improving biodiversity in cities. This study investigates how urban herbaceous and tree cover, building height, vegetation management, and the urban heat island effect influence cavity-nesting insect communities in Strasbourg, France. Using standardized trap nests installed in 58 herbaceous sites with contrasting management regimes and along urban environmental gradients, we assessed nest occupancy and diversity of plug materials as proxies for abundance and species richness. Structural equation modeling revealed that tree cover, building height and local temperature differences indirectly reduced the diversity of nest plug materials, mediated by shifts in local entomophilous plant community mean flowering period duration. While no direct effects were observed on total abundance, the frequency of entomophilous plants positively influenced diversity. Contrary to expectations, herbaceous habitat cover did not enhance diversity, and intensive management showed no clear negative impact. These findings highlight the multidimensional nature of urbanization and its effects on biodiversity. We emphasize the need for urban planning to consider direct and indirect effects of landscape and local-scale factors, including plant communities and microclimate, to support insect biodiversity in cities.</p>

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Entomophilous plants mediate the impacts of urban pressures on cavity-nesting insect diversity

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Alejandro Sotillo,
  • Etienne Chanez,
  • Kenji Fujiki,
  • François Chiron,
  • Laurent Hardion,
  • Audrey Muratet

摘要

In a context of global pollinator decline, characterizing the response of urban insects to the interplay between landscape composition, local habitat management, and microclimate, may inform management policies aimed at improving biodiversity in cities. This study investigates how urban herbaceous and tree cover, building height, vegetation management, and the urban heat island effect influence cavity-nesting insect communities in Strasbourg, France. Using standardized trap nests installed in 58 herbaceous sites with contrasting management regimes and along urban environmental gradients, we assessed nest occupancy and diversity of plug materials as proxies for abundance and species richness. Structural equation modeling revealed that tree cover, building height and local temperature differences indirectly reduced the diversity of nest plug materials, mediated by shifts in local entomophilous plant community mean flowering period duration. While no direct effects were observed on total abundance, the frequency of entomophilous plants positively influenced diversity. Contrary to expectations, herbaceous habitat cover did not enhance diversity, and intensive management showed no clear negative impact. These findings highlight the multidimensional nature of urbanization and its effects on biodiversity. We emphasize the need for urban planning to consider direct and indirect effects of landscape and local-scale factors, including plant communities and microclimate, to support insect biodiversity in cities.