Urban fragmentation leads to lower floral diversity, with knock-on impacts on bee biodiversity.

Autor: Theodorou P; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany. panatheod@gmail.com., Herbst SC; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany., Kahnt B; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany., Landaverde-González P; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany.; Unidad para el Conocimiento, Uso y Valoración de la Biodiversidad, Centro de Estudios Conservacionistas-CECON-, Facultad de Ciencias Químicas y Farmacia, Universidad de San Carlos de Guatemala, Avenida La Reforma 0-63 zona 10, 01010, Ciudad de Guatemala, Guatemala., Baltz LM; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany., Osterman J; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany.; Helmholtz Centre for Environmental Research-UFZ Leipzig, ESCALATE, Department of Computational Landscape Ecology, Permoserstrasse 15, 04318, Leipzig, Germany., Paxton RJ; General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120, Halle (Saale), Germany.; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Dec 10; Vol. 10 (1), pp. 21756. Date of Electronic Publication: 2020 Dec 10.
DOI: 10.1038/s41598-020-78736-x
Abstrakt: Bees and flowering plants are two closely interacting groups of organisms. Habitat loss and fragmentation associated with urbanisation are major threats to both partners. Yet how and why bee and floral richness and diversity co-vary within the urban landscape remain unclear. Here, we sampled bees and flowering plants in urban green spaces to investigate how bee and flowering plant species richness, their phylogenetic diversity and pollination-relevant functional trait diversity influence each other in response to urban fragmentation. As expected, bee abundance and richness were positively related to flowering plant richness, with bee body size (but not bee richness and diversity) increasing with nectar-holder depth of flowering plants. Causal modelling indicated that bottom-up effects dictated patterns of bee-flower relationships, with urban fragmentation diminishing flowering plants richness and thereby indirectly reducing bee species richness and abundance. The close relationship between bees and flowering plants highlights the risks of their parallel declines in response to land-use change within the urban landscape.
Databáze: MEDLINE
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