Branchinecta gigas
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| Branchinecta gigas Lynch, 1937 |
Branchinecta gigas là một loài tôm sinh sống ở tây Canada và Hoa Kỳ. Nó là loài tôm lớn trong Anostraca, có chiều dài 86 mm (3,4 in) long. Chúng ăn tôm nhỏ hơn. Chúng trưởng thành về sinh dục khi cơ thể dài 45–50 milimét (1,8–2,0 in) và dài đến 86 mm (3,4 in) long; con đực dài 66 mm (2,6 in).[2] Unpublished records exist of individuals up to 180 mm (7,1 in) long.[3] Dù là loài lớn nhất, B. gigas has the smallest eyes of any species trong họ, and possibly in all Anostraca.[3]
Mục lục |
Phân bố [sửa]
Branchinecta gigas has been found in Alberta, Saskatchewan, Washington, Montana, Oregon, North Dakota, Utah, Nevada and California.[4] A related species, Branchinecta raptor, occurs in Idaho.[5]
Ecology and behaviour [sửa]
B. gigas lives in hyposaline lakes and rivers, with salinity ranging from 1.8‰ to 5.8‰.[4] These waters often have high turbidity (low visibility), and so B. gigas hunts by feel rather than by sight.[3] When feeding, B. gigas adopts a "hunting posture", with the body bent double. The animal swims dorsal side down, with the abdomen nearly parallel with the thorax, so that the sensitive antennae and caudal rami all extends forwards. The thoracic limbs are held wide open, ready to close on any prey which enters.[6] This response appears to be entirely by feel, which correlates with the turbidity of the waters where B. gigas and its prey live.[6] The prey taken by B. gigas is chiefly other species of Anostraca,[7] especially Branchinecta mackini,[3] although it also eats copepods, cladocerans and sometimes green algae.[5]
Phân loại [sửa]
| Mã hiệu định danh bên ngoài cho Branchinecta gigas | |
|---|---|
| ITIS | 83700 |
| Encyclopedia of Life | 338982 |
| Còn có ở: SeaLifeBase | |
In 1935, J. F. Clark collected two specimens of a large branchiopod near Coulee City, Washington. These specimens were sent to James E. Lynch of the University of Washington in Seattle, who visited sites between Coulee City and the Grand Coulee Dam in 1936, and discovered further specimens. Lynch described the species as Branchinecta gigas in 1937.[8]
Tham khảo [sửa]
- ^ Inland Water Crustacean Specialist Group (1996). “Branchinecta gigas”. Loài bị đe dọa trong sách Đỏ. Version 2.3. Liên minh Bảo tồn Thiên nhiên Quốc tế. Truy cập ngày 3 tháng 3 năm 2011.
- ^ Graham R. Daborn (1975). “Life history and energy relations of the giant fairy shrimp Branchinecta gigas Lynch 1937 (Crustacea: Anostraca)”. Ecology 56 (5): 1025–1039. doi:10.2307/1936144.
- ^ a b c d Michel A. Boudrias & Jammieson Pires (2002). “Unusual sensory setae of the raptorial Branchinecta gigas (Branchiopoda: Anostraca)”. Hydrobiologia 486 (1): 19–27. doi:10.1023/A:1021317927643.
- ^ a b Ulrich Theodore Hammer (1986). “The plankton communities of saline lakes”. Saline Lake Ecosystems of the World. Volume 59 of Monographiae Biologicae. Springer. tr. 171–336. ISBN 9789061935353.
- ^ a b D. Christopher Rogers, Dana L. Quinney, James Weaver & Jørgen Olesen (2006). “A new giant species of predatory fairy shrimp from Idaho, USA (Branchiopoda: Anostraca)” (PDF). Journal of Crustacean Biology 26 (1): 1–12. doi:10.1651/C-2509.1.
- ^ a b G. E. White, G. Fabris & R. Hartland-Rowe (1969). “The method of prey capture by Branchinecta gigas Lynch, 1937 (Anostraca)”. Crustaceana 16 (2): 158–160. doi:10.1163/156854069X00411.
- ^ Geoffrey Fryer (1966). “Branchinecta gigas Lynch, a non-filter-feeding raptatory anostracan, with notes on the feeding habits of certain other anostracans”. Proceedings of the Linnean Society of London 177 (1): 19–34. doi:10.1111/j.1095-8312.1966.tb00948.x.
- ^ James E. Lynch (1937). “A giant new species of fairy shrimp of the genus Branchinecta from the state of Washington”. Proceedings of the United States National Museum 84 (3205): 555–562, pls. 77–80.
