First Advisor

Marion Dresner

Date of Publication

Spring 7-12-2019

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Environmental Science and Management

Department

Environmental Science and Management

Subjects

Bees -- Food -- Oregon -- Portland, Bees -- Feeding and feeds -- Oregon -- Portland, Pollinators

DOI

10.15760/etd.7005

Physical Description

1 online resource (vii, 64 pages)

Abstract

Bee pollinators can thrive in highly urbanized environments if their preferred floral resources and habitat types are available. Enhanced pollinator habitats are being created globally, with a large local effort in Portland, Oregon. This project determined if we were providing the most preferred floral resources at enhanced pollinator sites for bees, if floral resources were available throughout the season, and if differences in dietary preferences between native and honey bees would allow for the identification of "native bee floral resources" in South East Portland. Bee pollinators were monitored from June to August at three enhanced pollinator sites in South East Portland, Oregon. A total of 566 individual bees were observed, tiny dark bees and bumblebees composed the large majority of the urban bee composition. Vegetation metrics and bee presence were correlated using a Generalized Linear Mixed Model and significant variables that predicted bee presence included Solidago canadenisis (p-value 0.0024), density of floral resources (p-value Penstemon species and native bee preferred Solidago canadenisis. Recommendations for managing enhanced pollinator sites from this work included planting more late season plants, specific pollinator plant lists for native bees and honey bees and scheduling regular site care and watering at enhanced sites.

Persistent Identifier

https://archives.pdx.edu/ds/psu/29604

666489_supp_5FBE60AA-7D91-11E9-BA7B-A05B59571AF4.csv (33 kB)
Observational bee monitoring data collected from June to August 2018. This spreadsheet contains all bees observed, what floral resource they were seen on, as well as relative proportions of floral resources.

666489_supp_B86590DE-7D91-11E9-AF26-255E59571AF4.csv (6 kB)
All vegetation survey metrics measured in the field (percent cover, frequency, density, blossom density), and relative proportion values of floral resources that were calculated after data were collected.

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