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||binomial_authority = Nylander, 1848<ref name="DL">{{cite web |url=http://www.discoverlife.org/mp/20q?search=Bombus+sitkensis |title=Bombus sitkensis Nylander, 1848 |accessdate=2013-01-30 |publisher=Discover Life (American Museum of Natural History)}}</ref>
||binomial_authority = Nylander, 1848<ref name="DL">{{cite web |url=http://www.discoverlife.org/mp/20q?search=Bombus+sitkensis |title=Bombus sitkensis Nylander, 1848 |accessdate=2013-01-30 |publisher=Discover Life (American Museum of Natural History)}}</ref>
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'''''Bombus sitkensis''''' is a species of [[bumblebee]], also known as the '''Sitka bumblebee''', that is common in the western [[North America]] from [[Alaska]] to [[California]].
The '''Sitka bumblebee''', ''Bombus sitkensis'', is a species of [[bumblebee]], common in western North America from [[Alaska]] to [[California]].


== Description ==
== Description ==
The sitka bumblebee has an oblong head with a medium length [[proboscis]] (tongue). The females (queens and workers) have black and yellow hairs intermixed on the face and forward part of the [[thorax]] and a black patch in the middle of the thorax, while its sides are yellowish.<ref name="BBU">{{cite web |url=http://www.xerces.org/wp-content/uploads/Western_BB_guide.pdf |title=Bumble Bees of the Western United States |author=Jonathan Koch, James Strange & Paul Williams |year=2012 |pages= |format=PDF, 7.56 MB |accessdate=30 January 2013 |publisher=The Xerces Society }}</ref> [[Terga]] (abdominal segments) 1 and 2 are yellow, 3 and 4 black, the latter with a yellow posterior rim. The two last terga are brownish-red.<ref name="BSF">{{cite web |url=http://userwww.sfsu.edu/~sfbee/pdfs/GUIDE_TO_THE_BOMBUS_OF_SAN%20FRANCISCO___.pdf |title=Guide to the Bombus of San Francisco |format=PDF |accessdate=1 February 2013 |author=Quinn S. McFrederick |publisher=San Francisco State University }}</ref> The male has the face and forward parts of the thorax yellow, and only the posterior parts are darker (black and yellow intermixed). On the abdomen terga 1 and 2 are yellow,<ref name="BBU" /> and terga 3 to 5 yellow on the anterior part, black on the posteror. The tail (terga 6 to 7) is brownish-red.<ref name="BSF" />
The Sitka bumblebee has an oblong head with a medium-length [[proboscis]]. The females (queens and workers) have black and yellow hairs intermixed on the face and forward part of the [[thorax]] and a black patch in the middle of the thorax, while their sides are yellowish.<ref name="BBU">{{cite web |url=http://www.xerces.org/wp-content/uploads/Western_BB_guide.pdf |title=Bumble Bees of the Western United States |author=Jonathan Koch, James Strange & Paul Williams |year=2012 |pages= |format=PDF, 7.56 MB |accessdate=30 January 2013 |publisher=The Xerces Society }}</ref> [[Terga]] (abdominal segments) 1 and 2 are yellow, and 3 and 4 black, the latter with a yellow posterior rim. The two last terga are brownish-red.<ref name="BSF">{{cite web |url=http://userwww.sfsu.edu/~sfbee/pdfs/GUIDE_TO_THE_BOMBUS_OF_SAN%20FRANCISCO___.pdf |title=Guide to the Bombus of San Francisco |format=PDF |accessdate=1 February 2013 |author=Quinn S. McFrederick |publisher=San Francisco State University }}</ref> The male has the face and forward parts of the thorax yellow, and only the posterior parts are darker (black and yellow intermixed). On the abdomen terga 1 and 2 are yellow,<ref name="BBU" /> and terga 3 to 5 yellow on the anterior part, black on the posteror. The tail (terga 6 to 7) is brownish-red.<ref name="BSF" />


== Distribution ==
== Distribution ==
The species is a common bumblebee found in the western [[North America]] from [[Alaska]] and [[British Columbia]] over [[Washington (state)|Washington]], northern [[Idaho]], western [[Montana]] to the coastal parts of [[California]].<ref name="BBU" /><ref name="BCI">{{cite journal |author=Robbin W. Thorp; Donald S. Horning, Jr. and Lorry L. Dunning |date=February 1983 |title=Bumble Bees and Cuckoo Bumble Bees of California |journal=Bulletin of the California Insect Survey |volume=23 |pages=42–43 |publisher=University of California Press |isbn=0520096452 |url=http://essig.berkeley.edu/documents/cis/cis23.pdf |format=PDF (6,94 MB) |accessdate=27 July 2011}}</ref>
The species is a common bumblebee found in the western North America from [[Alaska]] and [[British Columbia]], and [[Washington (state)|Washington]], to northern [[Idaho]], western [[Montana], and the coastal parts of [[California]].<ref name="BBU" /><ref name="BCI">{{cite journal |author=Robbin W. Thorp; Donald S. Horning, Jr. and Lorry L. Dunning |date=February 1983 |title=Bumble Bees and Cuckoo Bumble Bees of California |journal=Bulletin of the California Insect Survey |volume=23 |pages=42–43 |publisher=University of California Press |isbn=0520096452 |url=http://essig.berkeley.edu/documents/cis/cis23.pdf |format=PDF (6,94 MB) |accessdate=27 July 2011}}</ref>


== Ecology ==
== Ecology ==
The sitka bumblebee forages on flowering plants from families as [[Ericaceae]] and [[Asteraceae]]; the females also fly to [[Saxifragaceae]] and [[Rhamnaceae]].
The Sitka bumblebee forages on flowering plants from families as [[Ericaceae]] and [[Asteraceae]]; the females also fly to [[Saxifragaceae]] and [[Rhamnaceae]]. The flight period for the queen is very long, from the end of January to the beginning of December. The first workers emerge in early March, while males appear in early April. Both the latter castes have disappeared by the end of September.<ref name="BCI" />
The flight period for the queen is very long, from the end of January to the beginning of December. The first workers emerge in early March, while males appear in early April. Both the latter castes have disappeared by the end of September.<ref name="BCI" />


==See also==
==See also==
⚫
*[[List of world bumblebee species]]
*[[Bumblebee]]

⚫
**[[List of world bumblebee species]]
*** Southern plains bumblebee, ''[[Bombus fraternus]]''
*** New garden bumblebee, ''[[Bombus hypnorum]]''
*** Orange-belted Bumblebee, ''[[Bombus ternarius]]''
*** Early bumblebee, ''[[Early bumblebee|Bombus pratorum]]''
*** Buff-tailed bumblebee or large earth bumblebee, ''[[Bombus terrestris]]''


== References ==
== References ==

Revision as of 22:35, 4 July 2014

Bombus sitkensis
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hymenoptera
Family:
Apidae
Genus:
Bombus
Subgenus:
Pyrobombus
Species:
B. sitkensis
Binomial name
Bombus sitkensis
Nylander, 1848[1]

The Sitka bumblebee, Bombus sitkensis, is a species of bumblebee, common in western North America from Alaska to California.

Description

The Sitka bumblebee has an oblong head with a medium-length proboscis. The females (queens and workers) have black and yellow hairs intermixed on the face and forward part of the thorax and a black patch in the middle of the thorax, while their sides are yellowish.[2] Terga (abdominal segments) 1 and 2 are yellow, and 3 and 4 black, the latter with a yellow posterior rim. The two last terga are brownish-red.[3] The male has the face and forward parts of the thorax yellow, and only the posterior parts are darker (black and yellow intermixed). On the abdomen terga 1 and 2 are yellow,[2] and terga 3 to 5 yellow on the anterior part, black on the posteror. The tail (terga 6 to 7) is brownish-red.[3]

Distribution

The species is a common bumblebee found in the western North America from Alaska and British Columbia, and Washington, to northern Idaho, western [[Montana], and the coastal parts of California.[2][4]

Ecology

The Sitka bumblebee forages on flowering plants from families as Ericaceae and Asteraceae; the females also fly to Saxifragaceae and Rhamnaceae. The flight period for the queen is very long, from the end of January to the beginning of December. The first workers emerge in early March, while males appear in early April. Both the latter castes have disappeared by the end of September.[4]

See also


References

  1. ^ "Bombus sitkensis Nylander, 1848". Discover Life (American Museum of Natural History). Retrieved 2013-01-30.
  2. ^ a b c Jonathan Koch, James Strange & Paul Williams (2012). "Bumble Bees of the Western United States" (PDF, 7.56 MB). The Xerces Society. Retrieved 30 January 2013.
  3. ^ a b Quinn S. McFrederick. "Guide to the Bombus of San Francisco" (PDF). San Francisco State University. Retrieved 1 February 2013.
  4. ^ a b Robbin W. Thorp; Donald S. Horning, Jr. and Lorry L. Dunning (February 1983). "Bumble Bees and Cuckoo Bumble Bees of California" (PDF (6,94 MB)). Bulletin of the California Insect Survey. 23. University of California Press: 42–43. ISBN 0520096452. Retrieved 27 July 2011.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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