Abstract
Cities are home to several species of pollinators that play an important role in the reproductive success of wild and cultivated plants that grow in these ecosystems and their surroundings. Pollution is a main driver of pollinator decline. Light and noise pollution are more intense in cities than in any other ecosystem. Although nocturnal pollinators are heavily exposed to these pollutants, their effect on bat pollination is still unknown. Our goal was to assess the effect of light and noise pollution on the main pollination components (pollinator visits, pollen transfer, pollen germination, fruit, and seed set) of the tropical tree, Ceiba pentandra, in a heavily urbanized ecosystem. We measured these components in sites with contrasting intensities of artificial light and anthropogenic noise and statistically assessed the direct and indirect effect of pollutants on pollination components using structural equation modeling. We found that noise and light pollution negatively affected the visits by the bats that pollinate C. pentandra. However, these negative effects did not affect posterior pollination components. In fact, the direct effect of light pollution on reproductive success was positive and greater than the indirect effects via pollinator visits. We suggest that illuminated trees may be able to sustain a large quantity of fruits and seeds because they produce more photosynthates due to greater light radiation and delayed leaf abscission. We conclude that, despite the negative effect of light and noise on pollinator visits, these pollutants did not significantly impact the reproductive success of C. pentandra.
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Acknowledgements
We are grateful to R Saldaña-Vázquez, C Ibarra-Cerdeña, and J Fraga-Berdugo for their comments on the first author’s thesis, from which this manuscript was derived. J Canul helped with the pollen count, and F Miss helped with field work. We thank all the owners that gave us access to trees in private areas.
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This research was funded by the Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav).
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HFD-C and MAM-R conceived and designed the experiments. HFD-C collected data, and MAM-R analyzed the data. MAM-R and HFD-C wrote the manuscript.
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Dzul-Cauich, H.F., Munguía-Rosas, M.A. Negative effects of light pollution on pollinator visits are outweighed by positive effects on the reproductive success of a bat-pollinated tree. Sci Nat 109, 12 (2022). https://doi.org/10.1007/s00114-021-01783-5
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DOI: https://doi.org/10.1007/s00114-021-01783-5