Nest in holes in wood blocks or pithy stems. Cell partitions and caps are made of leaf pulp (Cane et al. 2007).
occurs (regularly, as a native taxon) in multiple nations
Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) Older literature: Minnesota to Quebec and the New England states, south to Georgia. Discover Life Map shows this species to be widespread from Minnesota to Nova Scotia south to about Atlanta, Georgia and southern Mississippi, as Nebraska, Kansas, and extending south through Texas into Nuevo Leon, Mexico. It appears widespread in the Midwest and eastward occurs in the coastal plain, piedmont and the mountains.
Regularity: Regularly occurring
Type of Residency: Year-round
Catalog Number: USNM
Collection: Smithsonian Institution, National Museum of Natural History, Department of Entomology
Locality: Penn., Pennsylvania, United States
- Holotype: 1864. Proceedings of the Entomological Society of America. 2: 35.
Flowering Plants Visited by Osmia pumila in Illinois
(observations are from Robertson, Graenicher, Crosswhite & Crosswhite, Stoutamire, Barrett & Helenurm, and Cane et al.)
Apiaceae: Chaerophyllum procumbens sn (Rb), Erigenia bulbosa sn (Rb), Zizia aurea sn (Rb); Asteraceae: Antennaria plantaginifolia [stam sn] (Rb), Krigia biflora sn (Rb), Taraxacum officinale sn (Rb); Boraginaceae: Mertensia virginica sn cp (Rb); Brassicaceae: Arabis laevigata sn (Rb), Arabis shortii sn (Rb), Cardamine bulbosa sn cp fq (Rb), Dentaria laciniata sn (Rb); Caprifoliaceae: Linnaea borealis (BH), Viburnum dentatum sn (Rb), Viburnum prunifolium sn (Rb); Cornaceae: Cornus florida sn cp (Rb); Ebenaceae: Diospyros virginiana [stam sn] [pist sn] (Rb); Ericaceae: Vaccinium stamineum cp fq (Cn); Fabaceae: Astragalus crassicarpus trichocalyx sn cp fq (Rb), Cercis canadensis sn cp fq (Rb), Trifolium repens sn cp fq (Rb); Geraniaceae: Geranium maculatum sn (Rb); Grossulariaceae: Ribes missouriense sn (Rb); Hydrophyllaceae: Ellisia nyctelea sn (Rb), Hydrophyllum appendiculatum sn cp fq (Rb); Iridaceae: Sisyrinchium angustifolium sn (Rb); Lamiaceae: Glechoma hederacea sn fq (Rb), Scutellaria parvula sn cp (Rb); Lauraceae: Sassafras albidum sn (Rb); Liliaceae: Allium canadense sn (Gr), Camassia scilloides sn (Rb), Erythronium albidum sn fq (Rb, Gr), Erythronium americanum sn (Gr), Uvularia grandiflora sn (Gr); Malvaceae: Malva neglecta sn (Rb); Orchidaceae: Cypripedium pubescens exp (Stm); Oxalidaceae: Oxalis corniculata sn cp (Rb), Oxalis violacea sn fq (Rb); Polemoniaceae: Polemonium reptans sn cp fq (Rb); Portulacaceae: Claytonia virginica sn (Rb); Ranunculaceae: Anemonella thalictroides cp (Rb), Enemion biternatum cp/exp (Rb), Ranunculus fascicularis sn fq (Rb), Ranunculus septentrionalis sn cp fq (Rb); Rosaceae: Fragaria virginiana sn cp (Rb), Rosa setigera cp (Rb), Rubus allegheniensis sn cp (Rb), Rubus flagellaris sn cp fq (Rb), Rubus occidentalis sn (Rb); Rutaceae: Zanthoxylum americanum [stam sn fq] [pist sn fq] (Rb); Salicaceae: Salix amygdaloides [pist sn] (Rb), Salix rigida [stam sn fq] (Rb); Santalaceae: Comandra umbellata sn (Rb); Scrophulariaceae: Collinsia verna sn cp fq (Rb), Penstemon digitalis sn (Rb, CC), Penstemon gracilis gracilis (CC), Penstemon gracilis wisconsinensis (CC), Penstemon hirsutus sn cp fq (Rb), Penstemon pallidus (CC); Smilacaceae: Smilax tamnoides hispida sn cp (Rb); Valerianaceae: Valerianella radiata sn (Rb); Violaceae: Viola cucullata sn cp fq (Rb), Viola pubescens sn cp fq icp (Rb), Viola sagittata sn (Rb), Viola striata sn cp fq (Rb)
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: Unknown
Life History and Behavior
Phenology of pollination- changes in recent decades
Seasonal temperature changes are an important factor in determining when plants come into bloom. If there are significant changes in annual temperature cycles over time, the blooming schedule can be altered worldwide. This begs an important question for plant pollination. Have the insects and other animals that service animal-pollinated plants altered their behavioral calendar in a similar way?
Using historical museum datasets and recent bee-monitoring data, North American researchers have examined this question in ten species of wild bees: Colletes inaequalis, Andrena crataegi, Andrena carlini, Andrena miserabilis, Osmia pumila, Osmia bucephala, Osmia atriventris, Osmia lignaria, Bombus impatiens, and Bombus bimaculatus. Over the past 130 years, there has been a significant shift toward emergence earlier in the Spring among these bees, which average approximately ten days earlier now than in the late 1800s. This trend was most pronounced in the last forty years.(Bartomeus et al, 2011)
Does this shift resemble a shift in the bloom schedule of the plants these bees visit? Changes in plant bloom times in response to climate change have been a subject of intensive study recently and data is available through several studies of native plants in North America, from herbarium records and monitoring programs (Miller-Rushing et al, 2006; Primack et al, 2004; Bradley et al, 1999; Cook et al, 2008). Among 106 native plants that are visited by these ten bee species, there is also a significant trend toward earlier flowering. This trend also became more pronounced in the last forty years.(Bartomeus et al, 2011)
Do these two shifts mean that bees will continue to be active during appropriate periods to take advantage of the bloom calendar? That is difficult to say. Emergence and bloom dates are quite variable, and all ten of these bee species visit many different species of plant, which have different bloom calendars. Another important research question: do schedule shifts also correspond for specialist plant-pollinator pairs, where a single species of animal visits a single species of plant?
- Ignasi Bartomeusa, John S. Ascherb, David Wagnerc, Bryan N. Danforthd, Sheila Collae, Sarah Kornbluthb, and Rachael Winfreea. 2011. Climate-associated phenological advances in bee pollinators and bee-pollinated plants. Proceedings of the National Academy of Science, 108(51): 20645-20649
- Miller-Rushing AJ, Primack RB, Primack D, Mukunda S. 2006. Photographs and herbarium specimens as tools to document phenological changes in response to global warming. Am J Bot 93:1667–1674.
- Primack D, Imbres C, Primack RB, Miller-Rushing AJ, Del Tredici P. 2004. Herbarium specimens demonstrate earlier flowering times in response to warming in Boston. Am J Bot 91:1260–1264.
- Bradley NL, Leopold AC, Ross J, Huffaker W. 1999. Phenological changes reflect climate change in Wisconsin. Proc Natl Acad Sci USA 96:9701–9704.
- Cook BI, Cook ER, Huth PC, Thompson JE, Smiley D. 2008. A cross-taxa phenological dataset from Mohonk Lake, NY and its relationship to climate. Int J Climatol 1383: 1369–1383.
Molecular Biology and Genetics
Statistics of barcoding coverage: Osmia pumila
Public Records: 0
Specimens with Barcodes: 12
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Reasons: This is a very widespread, generalized, species, ranging from southern Canada into northern Mexico. It has no special nesting requirements. It visits a variety of flowers, including at least four crop genera, of which the two blueberries are also very common native species, and Malus and Rubus contain native as well as cultivated species. While this species has not been evaluated in great detail, it is almost certainly secure in much of its range, i.e. in much of the eastern USA.
Intrinsic Vulnerability: Not intrinsically vulnerable
Environmental Specificity: Broad. Generalist or community with all key requirements common.
Other Considerations: Probably fairly common northward and much more widely. This is one of several species of Osmia reported by Tuell et al. (2009) to pollinate both commercial blueberry in Michigan and a different species of blueberry in Maine (Stubbs et al., 1997). However, it is certainly not closely associated with blueberry based on its the range and on Virginia farms it is also reported from apple, Rubus, and once from cucurbits by Adamson (2011), although 15 of her 31 observations were form blueberry. This is one of two out of 13 species of Osmia that she found on all four crops, and the third most numerous species. Mitchell (1962) has reports from an exceptional variety of flowers, even grasses.
Global Short Term Trend: Relatively stable (=10% change)
Global Long Term Trend: Unknown
Comments: No major threats are known.
Global Protection: Unknown whether any occurrences are appropriately protected and managed
Names and Taxonomy
Comments: Placed in subgenus Nothosmia by Krombein et al. (1979). Michener (2000) included Centrosmia, Chenosmia, Monilosmia, and Nothosmia in Melanosmia. Sandhouse (1939) revised the Nearctic species, mostly under the subgeneric name Nothosmia.