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Effects of Chinese privet on bees and their vertical distribution in riparian forestsAuthor(s): Michael Ulyshen; Scott Horn; James L. Hanula
Source: Forest Science
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
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DescriptionChinese privet (Ligustrum sinense Lour.), is known to negatively affect biodiversity near the ground in invaded forests by forming thick layers of non-native vegetation in the midstory. Whether these effects extend above the shrub layer into the canopy remains unclear. We sought to test this question by using flight-intercept traps (clear plastic panels attached to a white bucket) to sample bees at three heights (0.5, 5, and 15 m) in plots in which L. sinense had or had not been experimentally eliminated. Privet removal (i.e., restoration) resulted in significantly higher bee abundance, richness, and diversity than in invaded sites, but this effect was only observed at 0.5 m. In restored plots, bee diversity was generally higher at 5 and 15 m than near the forest floor, but there were no differences between traps at 5 and 15 m. Our findings show that bees will benefit from the removal of invasive shrubs near the forest floor but not in the canopy. Why bee diversity is higher in the canopy than near the ground in temperate deciduous forests remains unknown.
Study Implications: Chinese privet is recognized as one of the most problematic plants invading southeastern US forests where it has strong negative effects on native plant and insect diversity near the forest floor. This study tested the impacts of privet removal on the diversity of bees at three heights to determine whether the effects of removing privet extend into the canopies of temperate deciduous forests. The findings indicate that management activities aimed at eliminating Chinese privet will greatly increase bee activity near the forest floor but will not immediately impact bee numbers in the canopy.
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CitationUlyshen, Michael D; Horn, Scott; Hanula, James L. 2020. Effects of Chinese privet on bees and their vertical distribution in riparian forests. Forest Science. 4(4): 370-. https://doi.org/10.1093/forsci/fxz088.
Keywordsbiodiversity, invasive species, forest management, pollinators, vertical stratification
- Impact of Chinese privet and its removal on pollinator diversity and abundance
- Removing an invasive shrub (Chinese privet) increases native bee diversity and abundance in riparian forests of the southeastern United States
- Removing Chinese privet from riparian forests still benefits pollinators five years later
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