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Filtering by: Creator Rothery, P. Committee Member Fisher, Glenn

Environmental impacts on native bumble bee pollinators in an agricultural landscape of western Oregon

Creator:

Skyrm, Kimberly M.

Abstract:

Bumble bees provide vital pollination services in both native and agricultural landscapes. However, in recent years, bumble bee populations have experienced global population declines. The primary causes of these declines have been attributed to the environmental impacts of pathogens, pesticide use and habitat fragmentation. While research has examined the impacts...

Resource Type:

Dissertation

Full Text:

, and writing of research in Chapter II-V. Dr. William P. Stephen assisted with study design, data
Enhancing the predatory potential of hoverflies on aphids in Oregon broccoli fields with floral resources

Creator:

Ambrosino, Mario D.

Abstract:

Four key aspects of the relationship between predatory hoverflies and the aphid pest Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the relationship between aphid density and hoverfly oviposition, 2) the larval voracity of key hoverfly species, 3) the preferences of hoverflies and broccoli...

Resource Type:

Dissertation

Full Text:

, including P. tanacetifolia and Coriandrum sativum. White et al. (1995), trapped higher numbers of adult