First Advisor

Susan E. Masta

Date of Award


Document Type


Degree Name

Bachelor of Science (B.S.) in Biology and University Honors






Native bees are all around us, yet very few surveys have been performed on which bees reside in Portland, Oregon. For this honors thesis, native bees collected from two urban orchards and one botanical garden located in eastern Portland in 2018 and 2019 were identified to genus or to species, and their floral use recorded. This data will become part of the ongoing native bee survey being performed by Susan Masta’s laboratory and the Museum of Natural History at Portland State University. The bees that were most commonly collected included Ceratina spp. (n = 42), Andrena spp. (n = 34), Halictus spp. (n = 29), and Bombus spp. (n = 21). Observations made during these collections suggest that a diversity of floral resources, but especially ornamental plants within Asteraceae, Rosaceae, and Boraginaceae (notably genera Erigeron, Symphyotrichum, Fragaria, and Pentaglottis) may support a wide diversity of native bees in an urban or suburban orchard setting over the greatest proportion of native bee flight seasons.


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