| 词条 | Bombus crotchii |
| 释义 |
| status = EN | status_system = IUCN3.1 | status_ref = [1] | genus = Bombus | parent = Bombus (Cullumanobombus) | species = crotchii | authority = Cresson, 1878 | synonyms =
| synonyms_ref = [2] }}Bombus crotchii is a species of bumblebee known by the common name Crotch's bumblebee.[2] It is native to California in the United States and Baja California in Mexico and has also been reported from Nevada.[1] This bee lives in grassland and scrub habitat types. It nests underground. Its food plants include milkweeds, dustymaidens, lupines, medics, phacelias, and sages.[1] This bee tolerates hotter and drier habitat types than do most bumblebees.[3] This is an endangered species. It is thought to have declined about 67% from its historic range, at least within the United States. It was once common in the Central Valley of California, but it is now hard to find there. This region has experienced urbanization and intensive agriculture, events that are thought to have contributed to the decline of the species.[1] References1. ^1 2 3 {{cite journal | author =Hatfield, R. | author2 =Jepsen, S. | author3 =Thorp, R. | author4 =Richardson, L. | author5 =Colla, S. | last-author-amp =yes | title = '' | journal = IUCN Red List of Threatened Species | volume=2015 | page = e.T44937582A46440211 | year =2015 | doi =10.2305/IUCN.UK.2015-2.RLTS.T44937582A46440211.en }} {{Taxonbar|from=Q2109267}}{{bombus-stub}}2. ^1 {{cite web|title=Species Bombus crotchii - Crotch's Bumble Bee|website=Bugguide|url=http://bugguide.net/node/view/79495}} 3. ^NatureServe. 2015. Bombus crotchii. NatureServe Explorer Version 7.1. Accessed 4 March 2016. 4 : Bumblebees|Fauna of the Baja California Peninsula|Endangered fauna of California|Insects described in 1878 |
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