Abstract :
[en] Urbanization affects the availability and diversity of floral resources (pollen and/or
nectar) for wild pollinating insects. For example, urban green areas are characterized by an
abundance of ornamental plant species. Increasingly, trees are planted to improve the aesthetics of urban streets and parks. These urban trees might offer important floral resources to pollinating insects. To examine the suitability of urban trees as resources for pollinating
insects, we investigated the chemical composition of pollen and nectar as well as the amount
of nectar produced by the nine major insect-pollinated tree species planted in cities of Western
Europe, namely Acer pseudoplatanus, Aesculus carnea, A. hippocastanum, Robinia pseudoacacia, Tilia cordata, T. x euchlora, T. x europaea, T. platyphyllos and T. tomentosa.
The analyses revealed that globally the Tilia trees provide pollen with lower contents of
polypeptides, amino acids and phytosterols compared with the other species. Urban tree
flowers offer abundant nectar with relatively high sugar contents (0.16–1.28 mg/flower);
sucrose was the predominant sugar in all nectars. The investigated tree species could therefore
be considered in future city plantings.
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