Animal Diversity WebU of M Museum of Zoology ADW Home ADW Home ADW Home University of Michigan Help About Aninal Names Teaching Special Topics About Us



Structured Inquiry Search — preview

Sceloporus undulatus


By Jennifer Largett

Species: Sceloporus undulatus

Geographic Range

Eastern fence lizards range from mid New York south to mid Florida and northern part Texas and as far west as Colorado.

Subspecies include: southern fence lizards, S. u. undulatus, southern prairie lizards, S. u. consobrinus, White Sands prairie lizards, S. u. cowlesi, northern plateau lizards, S. u. elongatus, red-lipped prairie lizards, S. u. erythrocheilus, northern prairie lizards, S. u. garmani, northern fence lizards, S. u. hyacinthinus, and southern plateau lizards, S. u. tristichus. (Bishop, 1941)

Biogeographic Regions
nearctic (Native )

Habitat

Eastern fence lizards are found in grasslands, shrublands, and the edges of pine or hardwood forests. Eastern fence lizards live under wood piles, logs, and rocks where they can be protected during the evening hours. During daylight hours eastern fence lizards can be found basking in the same areas in which they rest: on fences, logs, rock, and tree trunks. (Behler, 1979; Bishop, 1941; Kennedy, 1958)

Habitat Regions
temperate ; terrestrial

Terrestrial Biomes
savanna or grassland ; forest

Physical Description

Average mass
15 g
(0.53 oz)

Range length
9 to 19 cm
(3.54 to 7.48 in)

Eastern fence lizards vary in color geographically, but are usually gray, brown or a rusty color. Males and females are similar in size. Individuals in northern populations (northern New York south to Maryland) are generally smaller than individuals in southern populations (northern Virginia south to northern Florida). This may be because southern populations have a longer warm season in which to eat and grow.

Males have a blue patch on the belly and throat. Average adult mass is 15 g, while adult total lengths range from 9 to 19 cm. (Angilletta, 2001; Behler, 1979; Johnson, 1966; "Hormones, Brain, and Behavior", 1992)

Other Physical Features
ectothermic ; heterothermic ; bilateral symmetry

Sexual Dimorphism
sexes colored or patterned differently; male more colorful

Development

After being laid, eggs double in size during embryonic development. Eggs hatch from June to September. Upon hatching, individuals are about half the size of adults. They tend to grow quickly in the first two months of life and are fully mature at 1 year. (Bishop, 1941; Ferguson, et al., 1980; Smith, 1946)

Reproduction

During the mating season, beginning in April, males flash their blue patches to attract females. Males also have anal glands that secrete a pheromone during and after breeding season to attract females. After mating males and females no longer associate. Males may seek other mating opportunities. (Behler, 1979; Ferguson, et al., 1980; "Lizard Ecology", 1983; "Hormones, Brain, and Behavior", 1992)

Mating System
polygynous

Breeding interval
Young eastern fence lizards lay one clutch per year while older females can lay 2 to 4 clutches per year.

Breeding season
Breeding occurs from April to August.

Range number of offspring
3 to 13

Average gestation period
8 weeks

Range age at sexual or reproductive maturity (female)
1 to 2 years

Range age at sexual or reproductive maturity (male)
1 to 2 years

Mating occurs from April to August. Young females lay one clutch of 3 to 13 eggs. Older females lay 2 to 4 clutches per year. Eggs hatch from June to September. The eggs are laid below 3 to 7 cm of soil so that the moisture and temperature remain constant. It may take 10 weeks for the eggs to hatch after they have been deposited. The offspring reach maturity at 1 year of age. (Behler, 1979; "Lizard Ecology", 1983; Smith, 1946; "Hormones, Brain, and Behavior", 1992)

Key Reproductive Features
iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; oviparous

Female eastern fence lizards increase body size if food is available, which is directly correlated to an increased clutch size. After laying her eggs females leave their young to fend for themselves. (Ferguson, et al., 1980)

Parental Investment
no parental involvement; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female)

Lifespan/Longevity

Range lifespan
Status: captivity

5 (high) years

Average lifespan
Status: wild

4 years

Lifespans of eastern fence lizards are not well understood, but researchers believe that they can live for more than 5 years, possibly averaging ages of 4 years. However, the majority of eastern fence lizards probably die soon after hatching. (Haenel and John-Alder, 2002; Smith, 1946)

Behavior

Range territory size
47 to 61 m^2

Fence lizards are active during the day, from 0600h - 2000h, basking in the sun on wood piles, fence posts and trees. During the summer months the use of rock perches decreased while the use of tree trunks and branches increased. This allows them to maintain their temperature as the season gets hotter. They tend to choose more closed surroundings than other lizards.

Their sleeping location is very close to, if not at, their basking locale. This site is usually selected based on temperature and relative protection from predators.

Males flash their blue patch, as well as exhibit head-bobs and push-ups, in order to let other males know that this is his territory. Territory seems to be correlated directly to the availability to food as well as the presence and varations of other lizard species in the area. (Angert, et al., 2002; Angilletta, 2001; Kennedy, 1958; Mitchell, 1994; "Lizard Ecology", 1983; "Hormones, Brain, and Behavior", 1992)

Key Behaviors
arboreal ; terricolous; diurnal ; sedentary ; territorial

Home Range

Fence lizards have a very defined home range, ranging from 47 - 61 square meters. During years when food is plentiful, their home range increases. (Kennedy, 1958; "Lizard Ecology", 1983)

Communication and Perception

To attract mates and warn off other individuals, male eastern fence lizards do head bob displays, push ups, and puff themselves up. Head-bobs and push-ups are done in 4 to 5 second durations. (Mitchell, 1994)

Communication Channels
visual

Perception Channels
visual ; tactile ; acoustic ; vibrations ; chemical

Food Habits

Eastern fence lizards eat primarily insects and other arthropods, including ants (Formicidae), beetles (Coleoptera), weevils (Curculionidae), lady bugs Coccinellidae), spiders (Araneae), and centipedes (Chilopoda). They also sometimes eat snails (Gastropoda). Some plant matter like cheatgrass (Bromus tectorum) and needlegrass (Caproni stipa) is sometimes consumed. Females tend to eat more insects during the spring months, in order to save energy for egg-laying. Lizards generally forage twice daily. (Behler, 1979; Johnson, 1966)

Animal Foods
insects; terrestrial non-insect arthropods; mollusks

Plant Foods
leaves

Predation

Known Predators


Males with larger blue patches are more likely to be preyed on by birds. As a result, males have a high mortality rate during early spring when they are establishing mating territories. Females have a higher mortality rate during the period of egg-laying, because they are protecting their territory, making them more susceptible to predators. Larger lizard species, snakes, and domestic cats and dogs also eat eastern fence lizards. Eastern fence lizards are slower than other lizards, often giving predators. Eastern fence lizards are cryptically colored and can move quite rapidly when they are warm. (Angert, et al., 2002; Mitchell, 1994; "Lizard Ecology", 1983; "Hormones, Brain, and Behavior", 1992)

Anti-predator Adaptations
cryptic

Ecosystem Roles

Eastern fence lizards mainly feed on insects and are themselves prey for birds and other larger predators. They compete with other lizard species for their insect prey. Common parasites include chiggers and botflies. (Angert, et al., 2002)

Commensal/Parasitic Species

Economic Importance for Humans: Positive

Eastern fence lizards are used to help educate people about conservation and reptiles. Eastern fence lizards decrease insect and arachnid populations, which can be pest species in some areas. (Mitchell, 1994)

Positive Impacts
research and education; controls pest population

Economic Importance for Humans: Negative

Eastern fence lizards are not pests and do not have a negative effect on the human population. If individual lizards are harassed, they may bite. (Angilletta, 2001)

Conservation Status

IUCN Red List [Link]
Least Concern

US Federal List [Link]
No special status

CITES [Link]
No special status

State of Michigan List [Link]
No special status

Eastern fence lizards are thriving due to the availability edge habitats and secondary growth around pine forests, their preferred habitat. (Mitchell, 1994)

Other Comments

Flooding can have a disastrous effect on eastern fence lizard hatchling populations. (Behler, 1979; Pinch and Claussen, 2003)

For More Information

Find Sceloporus undulatus information at

Contributors

Tanya Dewey (editor), Animal Diversity Web, University of Michigan Museum of Zoology.

Jennifer Largett (author), Radford University, Karen Francl (editor, instructor), Radford University, .

References

The University of Chicago. 1992. Hormones, Brain, and Behavior. Chicago: The University of Chicago Press.

Presidents and Fellows of Harvard College. 1983. Lizard Ecology. Cambridge, Massachusetts: Harvard University Press.

Adolph, S., W. Porter. 1996. Growth, Seasonality, and Lizard Life Histories: Age and Size at Maturity. Oikos, 77: 267-278. Accessed September 05, 2007 at http://links.jstor.org/sici?sici=0030-1299%28199611%2977%3A2%3C267%3AGSALLH%3E2.0.CO%3B2-V.

Angert, A., D. Hutchison, D. Glossip, J. Losos. 2002. Microhabitat Use and Thermal Biology of the Collared Lizard (Crotaphytus collaris collaris) and the Fence Lizard (Sceloporus undulatus hyacinthinus) in Missouri Glades. Journal of Herpetology, 36: 23-29. Accessed September 18, 2007 at http://www.bioone.org/perlserv/?request=get-document&doi=10.1670%2F0022-1511%282002%29036%5B0023%3AMUATBO%5D2.0.CO%3B2.

Angilletta, M. 2001. Thermal and Physiological Constraints on Energy Assimilation in a Widespread Lizard. Ecology, 82: 3044-3056. Accessed September 05, 2007 at http://links.jstor.org/sici?sici=0012-9658%28200111%2982%3A11%3C3044%3ATAPCOE%3E2.0.CO%3B2-A.

Behler, J. 1979. The Audubon Society Feild Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf, Inc.

Bishop, M. 1941. New Locality for Sceloporus undulatus undulatus. Copeia, 1941: 54. Accessed September 05, 2007 at http://links.jstor.org/sici?sici=0045-8511%2819410325%293%3A1941%3A1%3C54%3ANLFSUU%3E2.0.CO%3B2-Q.

Ferguson, G., C. Bohlen, P. Woolley. 1980. Sceloporus Undulatus: Comparative Life History and Regulation of a Kansas Population. Ecology, 61: 313-322. Accessed October 01, 2007 at http://links.jstor.org/sici?sici=0012-9658%28198004%2961%3A2%3C313%3ASUCLHA%3E2.0.CO%3B2-I.

Haenel, G., H. John-Alder. 2002. Experimental and demographic analyses of growth rate and sexual size dimorphism in a lizard, Sceloporus undulatus. OIKOS, 96: 70-81.

Johnson, D. 1966. Diet and Estimated Energy Assimilation of Three Colorado Lizards. American Midland Naturalist, 76: 504-509. Accessed September 05, 2007 at http://links.jstor.org/sici?sici=0003-0031%28196610%2976%3A2%3C504%3ADAEEAO%3E2.0.CO%3B2-Y.

Kennedy, J. 1958. Sleeping Habits of the Eastern Fence Lizard, Sceloporus Undulatus Hyacinthinus. The Southwestern Naturalist, 3: 90-93. Accessed September 05, 2007 at http://links.jstor.org/sici?sici=0038-4909%281958%293%3A1%2F4%3C90%3ASHOTEF%3E2.0.CO%3B2-J.

Mitchell, J. 1994. The Reptiles of Virginia. Washington: Smithsonian Institution Press.

Pinch, F., D. Claussen. 2003. Effects of Temperature and Slope on the Sprint Speed and Stamina of the Eastern Fence Lizard, Sceloporus undulatus. Journal of Herpetology, 37: 671–679. Accessed September 13, 2007 at http://www.bioone.org/perlserv/?request=get-document&doi=10.1670%2F183-02.

Smith, H. 1946. Handbook to Lizards. Binghamtom., NY: Comstock Publishing Company, Inc..

To cite this page: Largett, J. 2008. "Sceloporus undulatus" (On-line), Animal Diversity Web. Accessed February 12, 2012 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Sceloporus_undulatus.html

Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

Other formats: OWL

Home  ¦  About Us  ¦  Special Topics  ¦  Teaching  ¦  About Animal Names  ¦  Help

Structured Inquiry Search — preview