Ambystoma jeffersonianum
Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Amphibia
Subclassis: Lissamphibia
Ordo: Urodela
Subordo: Salamandroidea
Familia: Ambystomatidae
Genus: Ambystoma
Species: Ambystoma jeffersonianum
Name
Ambystoma jeffersonianum (Green, 1827)
Type locality: "Near Chartier's creek in the vicinity of Jefferson College [formerly] at Cannonsburg", Washington County, Pennsylvania, USA.
Holotype: USNM 3968 ?
Synonyms
Salamandra jeffersoniana Green, 1827
Xiphonura jeffersoniana — Tschudi, 1838
Salamandra granulata Holbrook, 1842
Ambystoma jeffersoniana — Baird, 1850
Ambystoma fuscum Hallowell, 1858
Plethodon persimilis Gray, 1859
Pectoglossa persimilis — Mivart, 1868
Amblystoma jeffersonianum — Cope, 1868
Amblystoma platineum Cope, 1868
Amblystoma jeffersonianum var. fuscum — Cope, 1868
Amblystoma persimile — Strauch, 1870
Amblystoma jeffersonianum jeffersonianum — Cope, 1875
Ambystoma jeffersonianum platineum — Fowler & Dunn, 1917
Ambystoma jeffersonianum fuscum — Fowler & Dunn, 1917
Ambystoma jeffersonianum — Dunn, 1918
Amblystoma persimilis — Bourret, 1927
Ambystoma tremblayi Comeau, 1943
Ambystoma (Ambystoma) jeffersonianum — Tihen, 1958
References
Green, 1827, Contrib. Maclurian Lyc. Arts Sci., 1 : 4.
Dunn, 1918, Bull. Mus. Comp. Zool., 62: 458.
Frost, D. 2008. Amphibian Species of the World: an Online Reference. Version 5.2 (15 July, 2008). Electronic Database accessible at www.research.amnh.org/herpetology/amphibia. American Museum of Natural History, New York, USA. Ambystoma jeffersonianum
AmphibiaWeb: Information on amphibian biology and conservation. [web application]. 2010. Berkeley, California: Ambystoma jeffersonianum. AmphibiaWeb, available at http://amphibiaweb.org/.
2007 IUCN Red List of Threatened Species IUCN: Ambystoma jeffersonianum (Least Concern) Downloaded on 26 July 2008.
Vernacular names
English: Jefferson Salamander
The Jefferson salamander (Ambystoma jeffersonianum) is a mole salamander native to the northeastern United States, southern and central Ontario, and southwestern Quebec. It was named after Jefferson College in Pennsylvania.[2][3]
It is typically dark gray, brown, or black on its dorsal surface, but a lighter shade on its anterior. Some individuals may also have silver or blue specks on their sides; the area around the vent is usually gray. These salamanders are slender, with a wide nose and distinctive long toes, and range in size from 11 to 18 cm (4.3 to 7.1 in).
Like other mole salamanders, the Jefferson salamander burrows; they have well-developed lungs suited for this purpose. Nocturnal by nature, they can be spotted by day during the mating season. Breeding occurs in early spring, after the snow in the area has melted.
Reproduction
Eggs are laid in small agglomerations attached to submerged twigs or other natural support at the pond's edge. Clutches can contain between 5 and 60 eggs, averaging about 30. The age at which they first breed, and the frequency with which they breed, are unknown; females are estimated to first breed at 22 months, and males at 34 months. Eggs develop rapidly, and may hatch within 15 days. Larvae stay in the pond from two to four months, during which time they grow to between 3 and 8 times their hatching size.
A unique reproductive tactic for the Bluespotted-Jefferson Salamander Complex exists in nature. The Jefferson salamander is now known not to breed in the lab with the blue-spotted salamander, which was previously thought to produce "hybrids", the silvery salamander and Tremblay's salamander, between this supposed mating of Jefferson salamander and Blue-spotted salamander. The silvery salamander and Tremblay's salamander are now known through genetic testing to be polyploid females (only 2% of males survive and they are sterile). These most often possess two of each chromosome from the Jefferson salamander and one of each chromosome from the blue-spotted salamander, resulting in an LJJ genotype (also called a Tremblay's salamander.) This genotype results when these polyploid females mate with a pure Jefferson salamander male, incorporating (often in warmer water conditions) the chromosome from the pure male Jefferson salamander into her egg, usually having an LJ diploid chromosome set or LJJ triploid chromosome set, to produce LJJ or LJJJ offspring, respectively. Often in cooler conditions, the LJ or LJJ female may mate with the Jefferson salamander male and only "borrow" his spermatozoan to trigger genetic cloning of herself, not adding his chromosome (J) to her egg. The same polyploid reproductive strategy occurs for other mole salamander species. The presence of these polyploids makes it difficult to visually identify which species an individual may be, skewing population measures for both species.
Habitat
The secretive adults tend to hide under stones or logs, or in leaf litter and other underbrush in deciduous forests during damp conditions. They are usually not found in conifer forests, likely due to the dryness and prickliness of some pine and spruce needles, which may injure amphibians with their thin skins. They are found burrowed underground for most of the year during dry or freezing conditions. They must get below the frost line (about 18 inches) in order to survive winter conditions in northern latitudes. They often burrow in rich sandy soils found in upland deciduous forests or sometimes in older-growth damp hemlock forests.
Because breeding sites are usually close to the over-wintering burrows, migration to their breeding area is quick, and usually occurs during or immediately after a heavy rainfall. The breeding sites they choose are fishless ponds and vernal pools, filled with spring snow meltwater in northern latitudes. Some breeding ponds may be hundreds of yards (meters) away from their forest home in fragmented landscapes.
Jefferson salamanders are one of the first amphibians to emerge in springtime at the northern edge of their range in southern Ontario where they are seen "snowshoeing" across the still frozen understory of the forest to reach partially melted breeding ponds. Males migrate first with females following shortly thereafter. These salamanders have small pores on their heads which exude a whitish liquid when they are handled, suggesting that they may leave a scent trail during migration,[4] Ambystoma jeffersonianum is often found in the same habitat as the spotted salamander.
Food
The larvae are carnivorous, typically consuming aquatic invertebrates. An insufficient food supply may result in cannibalistic behaviour. Adults are also carnivorous, eating a variety of small invertebrates.
Status
The Jefferson salamander is a species of least concern globally, but its habitat is threatened in parts of its range.[1] In Ontario, it has been classified as an endangered species since 11 June 2011,[5] and throughout Canada it is a threatened species.[6] The government of Ontario has designated the species as a specially protected amphibian, which provides protection to the species and its habitats.[6]
It is also considered a state-threatened species in Illinois.[7]
References
IUCN SSC Amphibian Specialist Group (2015). "Ambystoma jeffersonianum". IUCN Red List of Threatened Species. 2015: e.T59059A56458965. doi:10.2305/IUCN.UK.2015-4.RLTS.T59059A56458965.en. Retrieved 19 November 2021.
"Jefferson Salamander". Species and Habitats. Ohio Department of Natural Resources, Division of Wildlife. Retrieved 22 August 2016. "The Jefferson salamander was named in honor of Jefferson College (indirectly after Thomas Jefferson, who was a famous statesman, president, and an accomplished naturalist)."
"Jefferson's Salamander". Ohio History Central. Ohio Historical Society. Retrieved 22 August 2016. "It was named for Jefferson College in Pennsylvania"
Jaeger, Robert G.; Fortune, Deborah; Hill, Gary; Palen, Amy; Risher, George (1993). "Salamander homing behavior and territorial pheromones: alternative hypotheses". Journal of Herpetology. 27 (2): 236–239. doi:10.2307/1564945. JSTOR 1564945.
"Jefferson salamander". Ontario Ministry of Natural Resources and Forestry. 10 February 2014. Retrieved 25 April 2015.
"Jefferson Salamander (Ambystoma jeffersonianum)". Species. Ontario Nature. Archived from the original on 7 May 2015. Retrieved 25 April 2015.
"CHECKLIST OF ILLINOIS ENDANGERED AND THREATENED ANIMALS AND PLANTS" (PDF). Illinois Endangered Species Protection Board. Illinois Endangered Species Protection Board. Retrieved 4 January 2019.
Environment Canada - Species at Risk: Jefferson Salamander
Amphibians of Canada: Jefferson salamander
US Geological Survey - Northern Prairie Wildlife Research Center: Jefferson Salamander
Names of the Reptiles and Amphibians of North America
Genetics of Jefferson Salamander References
Jefferson Salamander species account and conservation status
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
