Document Type

Article

Journal/Book Title/Conference

Environmental Entomology

Volume

18

Issue

1

Publisher

Entomological Society of America

Publication Date

2-1-1989

First Page

133

Last Page

138

Abstract

Pollen foraging as determined from nest provision analysis of seven Osmia species from one area for 2 yr indicated two specialist and five generalist species. Osmia coloradensis Cresson and O. californica Cresson were Asteraceae specialists . Osmia generalists showed significant pollen preferences . Osmia bakeri Cresson, O. indeprensa Sandhouse , O. kincaidii Cresson, and O. lignaria Say preferred Hydrophillaceae (Phacelia) pollen . Osmia pikei Cresson preferred Saxifragaceae (Ribes) and Ericaceae (Arctostaphylos) pollen. Foraging parameters of flowering species collected, dominant pollen, number of cells with 100% one pollen, and niche breadths were not significantly different between specialists and generalists. The wide use of Asteraceae genera by the specialists and the preferences shown by the generalists reduced the foraging differences between the groups.

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