Plestiodon fasciatus

Plestiodon fasciatus
Adult male
Juvenile
Not evaluated (IUCN 3.1)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Lacertilia
Infraorder: Scincomorpha
Family: Scincidae
Genus: Plestiodon
Species: P. fasciatus
Binomial name
Plestiodon fasciatus
(Linnaeus, 1758)
Synonyms
Plestiodon fasciatus on boardwalk at Francis Beidler Forest
Detail of head

The (American) five-lined skink (Plestiodon fasciatus) is a species of lizard endemic to North America. It is one of the most common lizards in the eastern U.S. and one of the seven native species of lizards in Canada. In the United States, the Plestiodon fasciatus or "Common Five-lined Skink" is an indigenous reptile of Virginia.[4]

Common names

Other common names include blue-tailed skink (for juveniles) and red-headed skink (for adults). It is technically appropriate to call it the American five-lined skink to distinguish it from the African skink Trachylepis quinquetaeniata (otherwise known as five-lined mabuya) or the eastern red-headed skink to distinguish it from its western relative Plestiodon skiltonianus (otherwise known as the western skink). The blue-tailed skink proper is Cryptoblepharus egeriae from Christmas Island, but in North America the juveniles of any Eumeces or Plestiodon species may be called this.

Description

The American five-lined skink is small to medium-sized, growing to about 12.5 to 21.5 centimetres (4.9 to 8.5 in) total length. Young five-lined skinks are dark brown to black with five distinctive white to yellowish stripes running along the body and a bright blue tail. The blue color fades to light blue with age, and the stripes also may slowly disappear. The dark brown color fades, too, and older individuals are often uniformly brownish. The southeastern five-lined skink, P. inexpectatus, of the Southeastern United States is very similar to this species and there is some overlap in range. The two species can be distinguished by their scales.[5] The broad-headed skink, P. laticeps, is similar, and may be difficult to distinguish from P. fasciatus. The former species usually lacks the two enlarged postlabial scales characteristic of P. fasciatus.[6] Adult male broad-headed skinks, with their large size and swollen red head, are readily distinguished from P. fasciatus.[7] It is important to note that the Plestiodon fasciatus is "toothy" and will flick its tongue to aim and bite.[4]

Geographic range

Subadult with partly regrown tail pictured in parkland in Memphis, Tennessee

The range of the five-lined skink extends in the north to southern Ontario, Michigan and eastern New York. The western border is in Minnesota, Missouri and eastern Kansas, Nebraska, Oklahoma, Florida, Mississippi, and Texas. These skinks tend to be most abundant on the coastal plain in the southeastern United States and along the Gulf Coast. They have now been seen in increasing numbers in the northern Chesapeake Bay Region of Maryland particularly along the shores of the Elk River. In concert with the verification of sightings in the Commonwealth of Virginia, a Plestiodon fasciatus was seen on 2 August 2015 in Pittsylvania County. On August 26, 2015 one was photographed in a parking lot in western Oregon. On September 10, 2015 one was photographed in the backyard of a home in Santee, Ca. The reptiles posture, stripes, blue tail, and glistening color make the Plestiodon fasciatus easy to spot when it is not hiding or nesting in shrubs, cracks, or under debris.[4]

Conservation status

The Great Lakes - St. Lawrence population is listed as "special concern" in Ontario and Canada by COSSARO,[8]COSEWIC,[9] and it is illegal to remove skinks from their habitats. Skinks are at the extreme edge of their habitat range in Canada, which makes it an area of special interest to ecologists, as extreme conditions place unique evolutionary pressures upon species. Five-lined skinks have split into two phylogenetically-distinct populations in this edge habitat: the Carolinian population, also present in the United States, ends around Point Pelee National Park in southern Ontario. The Carolinian population is listed as "endangered" in Ontario and Canada by COSSARO,[8]COSEWIC,[9] The St. Lawrence / Great Lakes population resides in the Ottawa Valley in eastern Ontario and tends to be more tolerant to sparse or rocky conditions than its sister subspecies.[10]

Habitat

Five-lined skinks are ground-dwelling animals. They prefer moist, partially wooded habitat that provides ample cover or inside walls of buildings as well as sites to bask in the sun. They can also be found in broken, rocky areas at the northern edge of their habitat.

Reproduction

Fertilization in five-lined skinks is internal, with eggs laid by the female between the middle of May and July, at least one month after mating. The mating season begins in May. The female Plestiodon will lay its eggs in June, and four to six weeks after the incubation, the young hatch. Thus the birthing process consists of laying eggs and external incubation.[4]

Females lay fifteen to eighteen eggs in a small cavity cleared beneath a rotting log, stump, board, loose bark, a rock, or an abandoned rodent burrow.[11] Females prefer secluded nest sites in large, moderately decayed logs. Soil moisture is also an important factor in nest selection. Females often place nests in regions where soil moisture is higher than in adjacent areas. Vertical position of the nest also varies with moisture, with nests located deeper in a soil cavity at dry sites. Even when nesting sites are not limited, a significant amount of aggregation occurs.

The parchment like eggs of five-lined skinks, similar to many other reptiles, are thin and easily punctured. Freshly laid eggs range from spherical to oval in shape averaging 1.3 cm in length. Absorption of water from the soil leads to increased egg size. Egg coloration also changes over time, from white to mottled tan, after contact with the nest burrow. The incubation period ranges from 24 to 55 days, and varies due to fluctuations in temperature. Females typically brood their eggs during this time, exhibiting defensive behavior against smaller predators. Parental care ends a day or two after hatching when hatchlings leave the nest. Young five-lined skinks, with a potential life span of up to six years, attain sexual maturity and begin reproducing within two to three years of hatching.[12]

Behavior

Closeup of the Skink's face

Adult male five-lined skinks exhibit complex courtship and aggressive behavior. Although males tolerate juveniles and females in their territories, they actively defend these areas against other males. Vomeronasal analysis of chemical cues and recognition of sex specific visual stimuli, including tail and body coloration, aid in the identification of gender. Evidence suggests that males may rely more on contact pheromones than volatile airborne molecules in the identification of conspecifics. Courting males grasp the necks of receptive females in their jaws after approaching them from the side. Using the tail to align cloacal openings, males initiate copulation by inserting one of the two hemipenes into the female's cloaca. Copulation events typically last four to eight minutes.

Female five-lined skinks demonstrate high levels of parental care which reduces egg mortality. Females exhibit several brooding positions of variant contact levels with the body placed beside, over, through, or in a coil around the eggs. Brooding position varies according to soil moisture. Maternal body contact increases at lower moisture levels potentially reducing transpirational loss of the eggs. In communal nests, females may alternate foraging and guarding of the nests, leaving eggs protected at all times. Females may also urinate in the nests and turn eggs to maintain humidity. In addition, females transfer heat from basking through body contact. Any eggs displaced from the nest are retrieved by head or snout rolling, and rotten eggs are eaten.

Five-lined skinks also exhibit antipredation behavior. In evasion of various predators including snakes, crows, hawks, shrews, moles, opossums, skunks, raccoons, and domestic cats, skinks may disconnect their entire tail or a small segment. Skinks run to shelter to escape their distracted predators as the disconnected tail continues to twitch. Skinks may also utilize biting as a defensive strategy.[12]

Captive care

Part of the tail regrowing

Five-lined skinks can be maintained in captivity with minimal care. Note, however, some U.S. states impose general restrictions on taking reptiles including native five-lined skinks from the wild without a permit or hunting license, for example, Maryland, Indiana and Ohio:

Photo gallery

References

  1. 1 2 3 The reptile Database. www.reptile-database.org
  2. 1 2 Stejneger, L., and T. Barbour. (1917) A Check List of North American Amphibians and Reptiles. Cambridge, Massachusetts: Harvard University Press. 125 pp. (Plestiodon fasciatus, p. 69.)
  3. ↑ Boulenger, G.A. (1887) Catalogue of the Lizards in the British Museum (Natural History). Second Edition. Volume III. Lacertidæ, Gerrhosauridæ, Scincidæ,... London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers.) xii + 575 pp. + Plates I.- XL. (Eumeces quinquelineatus, pp. 369-370.)
  4. 1 2 3 4 "Common five-lined skink - Plestiodon fasciatus". Virginia Herpetological Society. Retrieved 2 August 2015
  5. ↑ Breen, John F. (1992) Encyclopedia of Reptiles and Amphibians. TFH Publications.
  6. ↑ Palmer, William M., Alvin L. Braswell, Renaldo Kuhler (1995) Reptiles of North Carolina. Chapel Hill: University of North Carolina Press. ISBN 0-8078-2158-6.
  7. ↑ Beane, Jeff. (2006) Love Skinks. Wildlife in North Carolina 70: 14-19. ISSN 0043-549X.
  8. 1 2 http://www.ontario.ca/environment-and-energy/species-risk-ontario-list
  9. 1 2 http://www.sararegistry.gc.ca/species/speciesDetails_e.cfm?sid=538
  10. ↑ Quirt, Kate C.; Blouin-Demers, Gabriel; Howes, Briar J.; Lougheed, Stephen C. (2006). "Microhabitat Selection of Five-lined Skinks in Northern Peripheral Populations". Journal of Herpetology 40 (3): 335–342. doi:10.1670/0022-1511(2006)40[335:MSOFSI]2.0.CO;2.
  11. ↑ Harding, J. (1997) Amphibians and Reptiles of the Great Lakes Region. Ann Arbor, Michigan: University of Michigan Press.
  12. 1 2 http://animaldiversity.ummz.umich.edu/site/accounts/information/Eumeces_fasciatus.html

Further reading

External links

Wikispecies has information related to: Plestiodon
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