Wood turtle

Species of turtle

Speciesbox
| image = WoodTurtle. jpg
| image caption = Adult specimen
| image alt = A wood turtle lifting its head slightly while on rocky soil. | status = EN
| status ref =
| status system = IUCN3.1
| status2 = CITES A2
| status2 system = CITES
| status2 ref =
| genus = Glyptemys
| species = insculpta
| authority = (Le Conte, 1830)
| synonyms =
Emys pulchella Sweigger, 1814
Emys scabra Say, 1825
Testudo insculpta LeConte, 1830
Terrapene scabra: Bonaparte, 1830
Emys speciosa Gray, 1831
Emys inscripta Gray, 1831 (ex errore)
Emys speciosa var. levigata Gray, 1831
Clemmys (Clemmys) insculpta Fitzinger, 1835
Emys insculpta Harlan, 1835
Geoclemys pulchella Gray, 1855
Glyptemys insculpta Agassiz, 1857
Glyptemys pulchella Gray, 1869
Chelopus insculptus Cope, 1875
Calemys insculpta Feldman & Parham, 2002
| synonyms ref= Today, there are several prominent common names for the wood turtle, including sculptured tortoise, red legged tortoise, and redleg.

Wood turtles grow to between in straight carapace length, and reach a maximum of The wood turtle's karyotype consists of 50 chromosomes. The plastron of females and juveniles is flat while in males it gains concavity with age.

In the past, wood turtle populations were forced south by extending glaciers. Remains from the Rancholabrean period (300,000 to 11,000 years ago) have been found in states such as Georgia and Tennessee, both of which are well south of their current range. (areas like New Brunswick and Nova Scotia).

This species is oviparous, meaning these turtles produce offspring by laying eggs only and do not provide parental care outside of nest building. Thus, the location and quality of nesting sites determine the offspring survival and fitness, so females invest significant time and energy into nest site selection and construction. Females select nest sites based on soil temperature (preferring warmer temperature nest sites), but not soil composition. Average nest size is four inches wide and three inches deep. Also, females build nests in elevated areas in order to avoid flooding and predation. After laying eggs, female wood turtles will cover the nest with leaves or dirt in order to hide the unhatched eggs from predators, and then the female leaves the nest location until the next mating season. Nesting sites can be used by the same female for multiple years. Because nest building occurs along rivers, females tend to spend more time along river areas, compared to male turtles.

During the spring, the wood turtle is active during the daytime (usually from about 7:00 a. m. and 7:00 p. m.) In order to maintain its body temperatures through thermoregulation, it spends a considerable amount of time basking, most of which takes place in the late morning and late afternoon. The wood turtle reaches a peak body temperature of 37 °C (99 °F) after basking. During times of extreme heat, it has been known to estivate. Several reports mention individuals resting under vegetation, fallen debris and in shallow puddles. During the summer, the wood turtle is considered a largely terrestrial animal. At night, its average body temperature drops to between

Males are known to be aggressive, with larger and older turtles being more dominant. Larger males rank higher on the social hierarchy often created by wood turtle colonies. In the wild, the submissive turtle is either forced to flee, or is bombarded with physical abuses, which include biting, shoving, and ramming. Larger and more dominant males will sometimes try to remove a subordinate male while he is mating with a female. The defender will, if he does not successfully fight for his position, lose the female to the larger male. Therefore, among males, there is a direct relationship between copulation opportunities and social rank. When hunting, the wood turtle pokes its head into such areas as dead and decaying logs, the bottoms of bushes, and in other vegetation. In the water, it exhibits similar behavior, searching algae beds and cavities along the sides of the stream or river.

The wood turtle can travel at a relatively fast speed (upwards of ); it also travels long distances during the months that it is active. In one instance, of nine turtles studied, the average distance covered in a 24 hour period was , with a net displacement of
The wood turtle, an intelligent animal, has homing capabilities. Its mental capacity for directional movement was discovered after the completion of an experiment that involved an individual finding food in a maze. The results proved that these turtles have locating abilities similar to that of a rat. This was also proved by another, separate experiment. One male wood turtle was displaced after being captured, and within five weeks, it returned to the original location. The homing ability of the wood turtle does not vary among sexes, age groups, or directions of travel.

The wood turtle takes a long time to reach sexual maturity, has a low fecundity (ability to reproduce), but has a high adult survival rate. However, the high survival rates are not true of juveniles or hatchlings. Although males establish hierarchies, they are not territorial. In one rare instance, a female wood turtle hybridized with a male Blanding's turtle. Nesting occurs from May until July. Nesting areas receive ample sunlight, contain soft soil, are free from flooding, and are devoid of rocks and disruptively large vegetation. Female wood turtles in general lay one clutch per year and tend to congregate around optimal nesting areas. The wood turtle is the only known turtle species in existence that has been observed committing same sex intercourse. Same sex behavior in tortoises is known in more than one species. The wood turtle exhibits genetic sex determination, in contrast to the temperature dependent sex determination of most turtles.

Specific mating courtship occurs more often in the Fall months and usually during the afternoon hours from 11:00 to 13:00 when many of the turtles are out in the population feeding. Mating is based on a male competitive hierarchy where a few higher ranked males gain the majority of mates in the population. Male wood turtles fight to gain access to female mates. These fights involve aggressive behaviors such as biting or chasing one another, and the males defend themselves by retreating their heads into their hard shells. The higher ranked winning males in the hierarchy system have a greater number of offspring than the lower ranked male individuals, increasing the dominant male's fitness. Female wood turtles mate with multiple males and are able to store sperm from multiple mates.

Despite many sightings and a seemingly large and diverse distribution, wood turtle numbers are in decline. Many deaths caused by humans result from: habitat destruction, farming accidents, and road traffic. Also, it is commonly collected illegally for the international pet trade. These combined threats have caused many areas where they live to enact laws protecting it. For proper protection of the wood turtle, in depth land surveys of its habitat to establish population numbers are needed. One emerging solution to the highway mortality problem, which primarily affects nesting females,

While considered nationally as threatened by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC), the wood turtle is listed as vulnerable within the province of Nova Scotia under the Species at Risk Act. The species is highly susceptible to human land use activities, and special management practices for woodlands, rivers and farmland areas as well as motor vehicle use restrictions and general disruption protection during critical times such as nesting and movement to overwintering habitat is closely monitored. Since 2012, the Clean Annapolis River Project (CARP) has provided research and stewardship for this species including the identification of crucial habitats, distribution and movement estimation, and outreach.