1. Common names

2. Description

3. Geographic range

4. Habitat

5. Reproduction

6. Behavior

7. Diet

8. Conservation status

9. Captive care

10. Photo gallery

11. References

12. Further reading

13. External links

• ? Lacerta quinquelineata
  {{small|Linnaeus, 1766}}^[1]
• Plestiodon fasciatus
  {{small|— Baird, 1849}}^[3]
• Eumeces quinquelineatus
  {{small|— Boulenger, 1887}}^[2]
• Eumeces fasciatus
  {{small|— Heilprin, 1888}}^[1]
• Plestiodon fasciatus
  {{small|— Stejneger & Barbour, 1917}}^[3]
• Eumeces fasciatus
  {{small|— Taylor, 1936}}^[1]
• Plestiodon fasciatus
  {{small|— Schmitz et al., 2004}}^[1]

The (American) five-lined skink (Plestiodon fasciatus) is a species of lizard in the family Scincidae. The species is 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.

Common names

Other common names for P. fasciatus 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 {{convert|12.5|to|21.5|cm|in}} total length (including tail). Young American 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.^[4] 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.^[5] Adult male broad-headed skinks, with their large size and swollen red head, are readily distinguished from P. fasciatus.^[6]

Geographic range

The range of the American 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, Louisiana and Texas. P. fasciatus tends to be most abundant on the coastal plain in the southeastern United States and along the Gulf Coast. It has now been seen in increasing numbers in the northern Chesapeake Bay Region of Maryland particularly along the shores of the Elk River.{{Citation needed|date=January 2012}}

Habitat

The American five-lined skink is a ground-dwelling animal. It prefers moist, partially wooded habitat that provides ample cover or inside walls of buildings, trees as well as sites to bask in the sun. It can also be found in broken, rocky areas at the northern edge of its habitat.

Reproduction

Fertilization in the American five-lined skink 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.^[7]

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.^[8] 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 the American five-lined skink, similar to many other reptiles, are thin and easily punctured. Freshly laid eggs range from spherical to oval in shape averaging {{convert|1.3|cm|in|abbr=on}} 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 American 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.^[9]

Behavior

Adult male American 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 American 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 the 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.

American 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 death as the disconnected tail continues to twitch. Skinks may also utilize biting as a defensive strategy.^[9]

Diet

The common five-lined skink's diet consists primarily of a variety of arthropods, particularly spiders, crickets, beetles and other insects. However, they have been reported to also eat newborn mice, frogs, and other lizards.^[10]

Conservation status

The Great Lakes - St. Lawrence population of P. fasciatus is listed as "special concern" in Ontario and Canada by COSSARO^[11] and COSEWIC.^[12] It is illegal to remove any of the three species of skinks found in Canada 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. The American five-lined skink has 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,^[11] COSEWIC,^[12] 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.^[13]

Captive care

American five-lined skinks can be maintained in captivity with minimal care.{{citation needed|date=July 2013}} Some U.S. states impose general restrictions on taking reptiles including native American five-lined skinks from the wild without a permit or hunting license, for example Maryland (no more than 4 may be possessed without a permit),^[14] Indiana^[15] and Ohio.^[16]

A pair of skinks may live in a 25-30 US gallon terrarium, and may live for 5–10 years with adequate care.^[17][18]

Photo gallery

References

Further reading

• Behler, J.L., and F.W. King (1979). The Audubon Society Field Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf. 743 pp. {{ISBN|0-394-50824-6}}. (Eumeces fasciatus, pp. 570–571 + Plates 427, 437, 443).
• Conant, R. (1975). A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin. xviii + 429 pp. + Plates 1-48. {{ISBN|0-395-19979-4}} (hardcover), {{ISBN|0-395-19977-8}} (paperback). (Eumeces fasciatus, pp. 122–123, Figure 26 + Plate 19 + Map 75).
• Linnaeus, C. (1758). Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, diferentiis, synonymis, locis. Tomus I. Editio Decima, Reformata. Stockholm: L. Salvius. 824 pp. (Lacerta fasciatus, new species, p. 209). (in Latin).
• Martof, Bernard S., et al. (1980). Amphibians and Reptiles of the Carolinas and Virginia. Chapel Hill: University of North Carolina Press. {{ISBN|0-8078-4252-4}}.
• Powell, R., R. Conant and J.T. Collins (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. {{ISBN|978-0-544-12997-9}}. (Plestiodon fasciatus, pp. 307-308 + Plate 29 + Figures 113, 147, 148 + photo on p. 493).
• Smith, H.M., and E.D. Brodie, Jr. (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. {{ISBN|0-307-13666-3}}. (Eumeces fasciatus, pp. 76–77).
• [https://books.google.com/books?id=F4ffa47N9wwC&pg=PA308 Jensen, John B., Carlos D. Camp, Whit Gibbons and Matt J. Elliott (editors) (2008). Amphibians and Reptiles of Georgia. Athens, Georgia: University of Georgia Press. 579 pp. (Five-lined Skink, p. 308).] {{ISBN|0820331112}}.

External links

• Five-lined Skink, Canadian Biodiversity.
• [https://www.iowaherps.com/species/plestiodon_fasciatus Five-lined Skink], Reptiles and Amphibians of Iowa.

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