Bombus crotchii - Cresson, 1878
Crotch Bumble Bee
Synonym(s): Bombus (Cullumanobombus) crotchii Cresson, 1878
Taxonomic Status: Accepted
Related ITIS Name(s): Bombus crotchii Cresson, 1878 (TSN 714796)
Unique Identifier: ELEMENT_GLOBAL.2.834085
Element Code: IIHYM24480
Informal Taxonomy: Animals, Invertebrates - Insects - Bumble Bees
 
Kingdom Phylum Class Order Family Genus
Animalia Mandibulata Insecta Hymenoptera Apidae Bombus
Check this box to expand all report sections:
Concept Reference
Help
Concept Reference: Williams, P. H. 2008a. Bombus, bumblebees of the world. Web pages based on Williams, P.H. 1998. An annotated checklist of bumblebees with an analysis of patterns of description (Hymenoptera: Apidae, Bombini). Bulletin of the Natural History Museum (Entomology) 67:79-152. Online. Available: http://www.nhm.ac.uk/research-curation/research/projects/bombus/index.html. Accessed 2008-Oct.
Concept Reference Code: W08WIL01EHUS
Name Used in Concept Reference: Bombus (Cullumanobombus) crotchii
Taxonomic Comments: Subgenus: Cullumanobombus.
Conservation Status
Help

NatureServe Status

Global Status: G3G4
Global Status Last Reviewed: 19May2010
Global Status Last Changed: 23Mar2010
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G3 - Vulnerable
Reasons: This appears to be a poorly known bumblebee with a rather limited and very southern range, but in a subgenus that is not reportedly declining. While GU was considered for a rank, the species is not reported to be in trouble and is still being found, so it not imminently imperiled (G1 or G2). It also does not appear to be common and widespread (G5), so by process of elimination, G3G4. While the species probably would be resolved to G4, apparently secure, for now, but before assigning that rank it would be important to get an assessment of current threats, including increasing aridity which is expected to continue and worsen. Also while there are many historic records, more information on number of occurrences from the current century is needed.
Nation: United States
National Status: NNR

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S1S2)

Other Statuses

IUCN Red List Category: EN - Endangered

NatureServe Global Conservation Status Factors

Range Extent: 200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Range Extent Comments: Essentially endemic to austral habitats from central California to Baja California del Norte, Mexico, including the western edges of the deserts and the Central Valley, especially the southern part, but not the mountains or cool north coastal areas of California (Thorp et al., 1983). Not found in the southern Arizona mountains by Schmidt and Jacobson (2005), and no records from the San Francisco area (McFrederick and LeBuhn, 2006).

Number of Occurrences: 81 to >300

Number of Occurrences with Good Viability/Integrity: Unknown

Overall Threat Impact: Unknown
Overall Threat Impact Comments: Climate change, specifically increasing aridity, could be a threat, along with the usual ones for bumblebees. This species has a very narrow climatic specialization compared to most bumble bees.

Short-term Trend: Relatively Stable (<=10% change)
Short-term Trend Comments: Presumably more or less stable since none of the usual sources indicate it to be rare or declining.

Long-term Trend: Unknown

Intrinsic Vulnerability: Moderately vulnerable
Intrinsic Vulnerability Comments: This species is restricted to a very limited climatic range, much hotter and drier than most bumble bees thrive in. Its does not penetrate far into desert regions though. It is generally accepted, best documented by Williams et al. (2009), that narrow climatic specialization is a risk factor for bumblebees. Since this is not a mountain species now it is unclear whether it might be able adapt to climate change by moving up slope.

Environmental Specificity: Moderate. Generalist or community with some key requirements scarce.
Environmental Specificity Comments: Within its limited geogrpahic and climatic range the species is probably somewhat adaptable, and it utilizes a wide array of flowers

Other NatureServe Conservation Status Information

Distribution
Help
Global Range: (200,000-2,500,000 square km (about 80,000-1,000,000 square miles)) Essentially endemic to austral habitats from central California to Baja California del Norte, Mexico, including the western edges of the deserts and the Central Valley, especially the southern part, but not the mountains or cool north coastal areas of California (Thorp et al., 1983). Not found in the southern Arizona mountains by Schmidt and Jacobson (2005), and no records from the San Francisco area (McFrederick and LeBuhn, 2006).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map
Endemism: occurs (regularly, as a native taxon) in multiple nations

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Alameda (06001)*, Calaveras (06009)*, Colusa (06011), Contra Costa (06013)*, Fresno (06019), Glenn (06021)*, Imperial (06025)*, Inyo (06027), Kern (06029), Los Angeles (06037), Madera (06039)*, Mariposa (06043)*, Mendocino (06045)*, Merced (06047)*, Modoc (06049)*, Monterey (06053), Orange (06059), Riverside (06065), San Benito (06069), San Bernardino (06071), San Diego (06073), San Joaquin (06077)*, San Luis Obispo (06079), San Mateo (06081)*, Santa Barbara (06083), Santa Clara (06085)*, Siskiyou (06093)*, Solano (06095), Sonoma (06097)*, Stanislaus (06099)*, Tehama (06103)*, Tulare (06107), Tuolumne (06109)*, Ventura (06111), Yolo (06113)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 South Fork Eel (18010106)+*, Lost (18010204)+*, Shasta (18010207)+*, Scott (18010208)+*, Sacramento-Stone Corral (18020104)+, Upper Stony (18020115)+*, Paynes Creek-Sacramento River (18020155)+*, Thomes Creek-Sacramento River (18020156)+*, Upper Putah (18020162)+, Lower Sacramento (18020163)+, Upper Kern (18030001)+, South Fork Kern (18030002)+, Middle Kern-Upper Tehachapi- (18030003)+, Upper Poso (18030004)+*, Upper Deer-Upper White (18030005)+*, Upper Tule (18030006)+*, Upper Kaweah (18030007)+, Upper Dry (18030009)+*, Upper King (18030010)+*, Tulare-Buena Vista Lakes (18030012)+, Middle San Joaquin-Lower (18040001)+*, Middle San Joaquin-Lower (18040002)+*, San Joaquin Delta (18040003)+*, Upper San Joaquin (18040006)+*, Upper Merced (18040008)+*, Upper Tuolumne (18040009)+*, Upper Stanislaus (18040010)+*, Upper Calaveras (18040011)+*, Panoche-San Luis Reservoir (18040014)+, Suisun Bay (18050001)+*, San Pablo Bay (18050002)+*, Coyote (18050003)+*, San Francisco Bay (18050004)+*, Pajaro (18060002)+*, Carrizo Plain (18060003)+, Estrella (18060004)+*, Salinas (18060005)+*, Central Coastal (18060006)+, Cuyama (18060007)+, Santa Maria (18060008)+*, Santa Ynez (18060010)+, Santa Barbara Coastal (18060013)+*, Santa Barbara Channel Islands (18060014)+*, Ventura (18070101)+*, Santa Clara (18070102)+*, Calleguas (18070103)+*, Santa Monica Bay (18070104)+, Los Angeles (18070105)+*, San Gabriel (18070106)+, San Jacinto (18070202)+, Santa Ana (18070203)+, Newport Bay (18070204)+*, Aliso-San Onofre (18070301)+, Santa Margarita (18070302)+*, San Luis Rey-Escondido (18070303)+*, San Diego (18070304)+*, Owens Lake (18090103)+, Eureka-Saline Valleys (18090201)+, Death Valley-Lower Amargosa (18090203)+, Panamint Valley (18090204)+, Indian Wells-Searles Valleys (18090205)+, Antelope-Fremont Valleys (18090206)+, Coyote-Cuddeback Lakes (18090207)+*, Mojave (18090208)+, Southern Mojave (18100100)+, Whitewater River (18100201)+*, San Felipe Creek (18100203)+, Salton Sea (18100204)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History Not yet assessed
Help
Economic Attributes Not yet assessed
Help
Management Summary Not yet assessed
Help
Population/Occurrence Delineation Not yet assessed
Help
Population/Occurrence Viability
Help
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
Help
Authors/Contributors
Help
NatureServe Conservation Status Factors Edition Date: 19May2010
NatureServe Conservation Status Factors Author: Schweitzer, D.F.

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

References
Help
  • Abbott, V. A., J. L. Nadeau, H. A. Higo, and M. L. Winston. 2008. Lethal and sub-lethal effects of imidacloprid on Osmia lignaria and clothianidin on Megachile rotundata (Hymenoptera: Megachildae). Journal of Economic Entomology 101:784-796.

  • Hatfield, R., S. Colla, S. Jepsen, L. Richardson, R. Thorp, and S. F. Jordan. 2014. IUCN assessments for North American Bombus spp. Technical report for the North American IUCN Bumble Bee Specialist Group. Assessments completed 2014, document updated in February 2015. 56 pp.

  • Integrated Taxonomic Information System (ITIS). 2008. World Bee Checklist Project (version 03-Oct-2008). Integrated Taxonomic Information System: Biological Names. Online. Available: http://www.itis.gov.

  • Schweitzer, D.F., N.A. Capuano, B.E. Young and S.R. Colla. 2012. Conservation and management of North American bumble bees. NatureServe, Arlington, Virginia, and USDA Forest Service, Washington, D.C. 17 pp.

  • Thorp, R.W., D.S. Horning, and L.L Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23: viii+79 pp.

  • Williams, P. H. 2008a. Bombus, bumblebees of the world. Web pages based on Williams, P.H. 1998. An annotated checklist of bumblebees with an analysis of patterns of description (Hymenoptera: Apidae, Bombini). Bulletin of the Natural History Museum (Entomology) 67:79-152. Online. Available: http://www.nhm.ac.uk/research-curation/research/projects/bombus/index.html. Accessed 2008-Oct.

  • Williams, P.H., R.W. Thorp, L.L. Richardson, and S.R. Colla. 2014b. Bumble bees of North America: an Identification Guide. Princeton University Press. 208 pp.

Use Guidelines & Citation

Use Guidelines and Citation

The Small Print: Trademark, Copyright, Citation Guidelines, Restrictions on Use, and Information Disclaimer.

Note: All species and ecological community data presented in NatureServe Explorer at http://explorer.natureserve.org were updated to be current with NatureServe's central databases as of March 2018.
Note: This report was printed on

Trademark Notice: "NatureServe", NatureServe Explorer, The NatureServe logo, and all other names of NatureServe programs referenced herein are trademarks of NatureServe. Any other product or company names mentioned herein are the trademarks of their respective owners.

Copyright Notice: Copyright © 2018 NatureServe, 4600 N. Fairfax Dr., 7th Floor, Arlington Virginia 22203, U.S.A. All Rights Reserved. Each document delivered from this server or web site may contain other proprietary notices and copyright information relating to that document. The following citation should be used in any published materials which reference the web site.

Citation for data on website including State Distribution, Watershed, and Reptile Range maps:
NatureServe. 2018. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available http://explorer.natureserve.org. (Accessed:

Citation for Bird Range Maps of North America:
Ridgely, R.S., T.F. Allnutt, T. Brooks, D.K. McNicol, D.W. Mehlman, B.E. Young, and J.R. Zook. 2003. Digital Distribution Maps of the Birds of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

Acknowledgement Statement for Bird Range Maps of North America:
"Data provided by NatureServe in collaboration with Robert Ridgely, James Zook, The Nature Conservancy - Migratory Bird Program, Conservation International - CABS, World Wildlife Fund - US, and Environment Canada - WILDSPACE."

Citation for Mammal Range Maps of North America:
Patterson, B.D., G. Ceballos, W. Sechrest, M.F. Tognelli, T. Brooks, L. Luna, P. Ortega, I. Salazar, and B.E. Young. 2003. Digital Distribution Maps of the Mammals of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

Acknowledgement Statement for Mammal Range Maps of North America:
"Data provided by NatureServe in collaboration with Bruce Patterson, Wes Sechrest, Marcelo Tognelli, Gerardo Ceballos, The Nature Conservancy-Migratory Bird Program, Conservation International-CABS, World Wildlife Fund-US, and Environment Canada-WILDSPACE."

Citation for Amphibian Range Maps of the Western Hemisphere:
IUCN, Conservation International, and NatureServe. 2004. Global Amphibian Assessment. IUCN, Conservation International, and NatureServe, Washington, DC and Arlington, Virginia, USA.

Acknowledgement Statement for Amphibian Range Maps of the Western Hemisphere:
"Data developed as part of the Global Amphibian Assessment and provided by IUCN-World Conservation Union, Conservation International and NatureServe."

NOTE: Full metadata for the Bird Range Maps of North America is available at:
http://www.natureserve.org/library/birdDistributionmapsmetadatav1.pdf.

Full metadata for the Mammal Range Maps of North America is available at:
http://www.natureserve.org/library/mammalsDistributionmetadatav1.pdf.

Restrictions on Use: Permission to use, copy and distribute documents delivered from this server is hereby granted under the following conditions:
  1. The above copyright notice must appear in all copies;
  2. Any use of the documents available from this server must be for informational purposes only and in no instance for commercial purposes;
  3. Some data may be downloaded to files and altered in format for analytical purposes, however the data should still be referenced using the citation above;
  4. No graphics available from this server can be used, copied or distributed separate from the accompanying text. Any rights not expressly granted herein are reserved by NatureServe. Nothing contained herein shall be construed as conferring by implication, estoppel, or otherwise any license or right under any trademark of NatureServe. No trademark owned by NatureServe may be used in advertising or promotion pertaining to the distribution of documents delivered from this server without specific advance permission from NatureServe. Except as expressly provided above, nothing contained herein shall be construed as conferring any license or right under any NatureServe copyright.
Information Warranty Disclaimer: All documents and related graphics provided by this server and any other documents which are referenced by or linked to this server are provided "as is" without warranty as to the currentness, completeness, or accuracy of any specific data. NatureServe hereby disclaims all warranties and conditions with regard to any documents provided by this server or any other documents which are referenced by or linked to this server, including but not limited to all implied warranties and conditions of merchantibility, fitness for a particular purpose, and non-infringement. NatureServe makes no representations about the suitability of the information delivered from this server or any other documents that are referenced to or linked to this server. In no event shall NatureServe be liable for any special, indirect, incidental, consequential damages, or for damages of any kind arising out of or in connection with the use or performance of information contained in any documents provided by this server or in any other documents which are referenced by or linked to this server, under any theory of liability used. NatureServe may update or make changes to the documents provided by this server at any time without notice; however, NatureServe makes no commitment to update the information contained herein. Since the data in the central databases are continually being updated, it is advisable to refresh data retrieved at least once a year after its receipt. The data provided is for planning, assessment, and informational purposes. Site specific projects or activities should be reviewed for potential environmental impacts with appropriate regulatory agencies. If ground-disturbing activities are proposed on a site, the appropriate state natural heritage program(s) or conservation data center can be contacted for a site-specific review of the project area (see Visit Local Programs).

Feedback Request: NatureServe encourages users to let us know of any errors or significant omissions that you find in the data through (see Contact Us). Your comments will be very valuable in improving the overall quality of our databases for the benefit of all users.