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The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae)

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Bumble bees (Bombus spp.) are adept pollinators of countless cultivated and wild flowering plants, but many species have experienced declines in recent decades. Though urban sprawl has been implicated as a driving force of such losses, urban green spaces hold the potential to serve as habitat islands for bumble bees. As human populations continue to grow and metropolitan areas become larger, the survival of many bumble bee species will hinge on the identification and implementation of appropriate conservation measures at regional and finer scales. North Texas is home to some the fastest-growing urban areas in the country, including Denton County, … continued below

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xiii, 151 pages : illustrations

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Beckham, Jessica L. May 2016.

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  • Beckham, Jessica L.

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Bumble bees (Bombus spp.) are adept pollinators of countless cultivated and wild flowering plants, but many species have experienced declines in recent decades. Though urban sprawl has been implicated as a driving force of such losses, urban green spaces hold the potential to serve as habitat islands for bumble bees. As human populations continue to grow and metropolitan areas become larger, the survival of many bumble bee species will hinge on the identification and implementation of appropriate conservation measures at regional and finer scales. North Texas is home to some the fastest-growing urban areas in the country, including Denton County, as well as at least two declining bumble bee species (B. pensylvanicus and B. fraternus). Using a combination of field , molevular DNA and GIS methods I evaluated the persistence of historic bumble bee species in Denton County, and investigated the genetic structure and connectivity of the populations in these spaces. Field sampling resulted in the discovery of both B. pensylvanicus and B. fraternus in Denton County's urban green spaces. While the relative abundance of B. fraternus in these spaces was significantly lower than historic levels gleaned from museum recors, that of B. pensylvanicus was significantly higher. Statistical analyses found that both bare ground and tree cover surrounding sample sites were negatively associated with numbers of bumble bee individuals and hives detected in these green spaces. Additionally, limited genetic structuring of bumble bee populations was detected, leading to the conclusion that extensive gene flow is occurring across populations in Denton County.

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xiii, 151 pages : illustrations

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  • May 2016

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  • June 28, 2016, 4:28 p.m.

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  • May 20, 2020, 2:33 p.m.

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Thumbnail image of item number 1 in: 'The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae)'.
Thumbnail image of item number 2 in: 'The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae)'.
Thumbnail image of item number 3 in: 'The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae)'.
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Beckham, Jessica L. The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae), dissertation, May 2016; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc849737/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .

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