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<p>With increasing urbanisation, domestic gardens may provide important habitats for bees in densely built environments. However, gardens differ in size, planting choices, and sunlight exposure, leading to strong variation in the quantity, quality, and attractiveness of floral resources and nesting sites for bees. We surveyed bees using homeowner-deployed pan traps in 59 domestic gardens in suburban Île-de-France (France), enabling near-synchronous sampling across three rounds in spring 2024 and 2025. We quantified garden size and flowering resources (genus richness and nectar sugar production) while distinguishing between spontaneous versus cultivated and native versus exotic plants. We also evaluated local sunlight exposure and flower density surrounding pan traps. A total of 959 bees representing 84 species were sampled. <i>Lasioglossum</i> accounted for 66% of all individuals, followed by <i>Andrena</i> (7%), <i>Bombus</i> (6%), and <i>Seladonia</i> (5%). Local sunlight exposure was the main factor positively influencing <i>Lasioglossum</i> abundance and species richness in pan traps. Garden size showed a non-linear effect on <i>Lasioglossum</i>: abundance and species richness increased up to ~ 900&#xa0;m² but slightly declined in larger gardens. <i>Lasioglossum</i> abundance decreased with nectar sugar quantity from cultivated native plants, possibly reflecting reduced pan trap attractiveness in gardens containing dense, and highly rewarding floral patches. The use of pan traps with homeowner participation appeared effective for sampling <i>Lasioglossum</i> near-synchronously in gardens, but differentiating ecological drivers from methodological biases remains challenging. The strong positive influence of sunlight exposure on <i>Lasioglossum</i> captures highlights the need to account for this parameter in environments with variable sunlight conditions, such as domestic gardens.</p>

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Synchronised pan trap sampling in domestic gardens: Sunlight exposure shapes wild bee captures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Mathieu Lachaise,
  • Quentin Dutertre,
  • Muriel Deparis,
  • Emmanuelle Baudry,
  • Blanche Collard

摘要

With increasing urbanisation, domestic gardens may provide important habitats for bees in densely built environments. However, gardens differ in size, planting choices, and sunlight exposure, leading to strong variation in the quantity, quality, and attractiveness of floral resources and nesting sites for bees. We surveyed bees using homeowner-deployed pan traps in 59 domestic gardens in suburban Île-de-France (France), enabling near-synchronous sampling across three rounds in spring 2024 and 2025. We quantified garden size and flowering resources (genus richness and nectar sugar production) while distinguishing between spontaneous versus cultivated and native versus exotic plants. We also evaluated local sunlight exposure and flower density surrounding pan traps. A total of 959 bees representing 84 species were sampled. Lasioglossum accounted for 66% of all individuals, followed by Andrena (7%), Bombus (6%), and Seladonia (5%). Local sunlight exposure was the main factor positively influencing Lasioglossum abundance and species richness in pan traps. Garden size showed a non-linear effect on Lasioglossum: abundance and species richness increased up to ~ 900 m² but slightly declined in larger gardens. Lasioglossum abundance decreased with nectar sugar quantity from cultivated native plants, possibly reflecting reduced pan trap attractiveness in gardens containing dense, and highly rewarding floral patches. The use of pan traps with homeowner participation appeared effective for sampling Lasioglossum near-synchronously in gardens, but differentiating ecological drivers from methodological biases remains challenging. The strong positive influence of sunlight exposure on Lasioglossum captures highlights the need to account for this parameter in environments with variable sunlight conditions, such as domestic gardens.