Bog Turtle

Bog Turtle

Kingdom
Phylum
Subphylum
Class
Order
Suborder
Family
Genus
SPECIES
Glyptemys muhlenbergii
Population size
2,500-10,000
Life Span
20-50 yrs
WEIGHT
110 g
LENGTH
8-11 cm

The Bog turtle is a critically endangered semiaquatic turtle native to the eastern United States. Its head is dark brown to black in color and there is a bright yellow, orange, or red spot on each side of its neck. The spot is often forked, facing posteriorly. The Bog turtle has a dark skin color with an orange-red wash on the inside of the legs of some individuals. The carapace is domed and rectangular in shape, and it tends to be narrower toward the head and wider toward the tail. The carapace often has easily identifiable rings on the rough scales or scutes. In some older individuals and those that burrow frequently in coarse substrates, the shell may be smooth. Although generally black, a chestnut sunburst pattern in each scute is sometimes present on the carapace. The belly of the shell, the plastron, is also a dark brown to black color with light marks present.

Distribution

Bog turtles are found from Vermont in the north, south to Georgia, and west to Ohio. They prefer calcareous wetlands (areas containing lime), including meadows, bogs, marshes, and spring seeps, that have both wet and dry regions. Their habitat is often on the edge of woods. Bog turtles may occasionally visit cow pastures and areas near beaver dams.

Bog Turtle habitat map

Biome

Climate zones

Habits and Lifestyle

Bog turtles are semiaquatic and can move both on land and in the water. They are primarily diurnal, active during the day, and sleeping at night. They wake in the early morning, bask until fully warm, and then begin their search for food. During colder days, Bog turtles spend much of their time in dense underbrush, underwater, or buried in mud. On warmer days, their activities include scavenging, mating (during early spring), and basking in the sunlight. However, during times of extreme heat, Bog turtles usually take shelter from the sun and occasionally may either estivate or occupy networks of tunnels filled with water. At night, they bury themselves in soft tunnels. Bog turtles feed only during the day, but rarely during the hottest hours, consuming their food on land or in the water. Late September to March or April is usually spent in hibernation, either alone or in small groups in spring seeps. These groups can contain up to 12 individuals and sometimes can include other species of turtles. Bog turtles try to find an area of dense soil, such as a strong root system, for protection during the dormant period. However, they may hibernate in other places such as the bottom of a tree, animal burrows, or empty spaces in the mud. Bog turtles emerge from hibernation when the air temperature is between 16 and 31 °C (61 and 88 °F).

Seasonal behavior

Diet and Nutrition

Bog turtles are omnivorous creatures. They feed on aquatic plants (such as duckweed), seeds, berries, earthworms, snails, slugs, insects, other invertebrates, frogs, and other small vertebrates. Occasionally they may eat carrion.

Mating Habits

REPRODUCTION SEASON
spring
INCUBATION PERIOD
42-80 days
INDEPENDENT AGE
at birth
FEMALE NAME
female
MALE NAME
male
BABY NAME
hatchling
BABY CARRYING
1-6 eggs

Bog turtles breed in the spring after emerging from hibernation. In a single season, females may mate once, twice, or not at all, and males try to mate as many times as possible. Nesting usually takes place between April and July. The female digs a cavity in a dry, sunny area of a bog, and lays her eggs in a grass tussock or on sphagnum moss. Most eggs are laid in June. Pregnant females lay 1 to 6 eggs per clutch and produce one clutch per year. Typically, older females lay more eggs than younger ones. After the eggs are laid, they are incubated for 42 to 80 days. Hatchlings are about 2.5 centimeters (0.98 in) long when they emerge from their eggs, usually in late August or September. Females are slightly smaller at birth and tend to grow more slowly than males. Juveniles almost double in size in their first 4 years but do not become fully grown until 5 or 6 years old. Both the males and the females become reproductively mature when they reach between 8 and 11 years of age.

Population

Population threats

The major threat to Bog turtles is the loss of their native habitat which has resulted in the disappearance of 80 percent of the colonies that existed 30 years ago. The invasion of non-native plants into their habitat is a large threat to Bog turtles' survival. Such plants out-compete the native species in their habitat, thus reducing the amount of food and protection. The development of new neighborhoods and roadways obstructs Bog turtles' movement between wetlands, thus inhibiting the establishment of new colonies. Pesticides, runoff, and industrial discharge are all harmful to Bog turtles' habitat and food supply. Because of their rarity, Bog turtles are also in danger of illegal collection, often for the worldwide pet trade. The eggs are also vulnerable during the incubation period and often fall prey to mammals and birds. In addition, eggs may be jeopardized by flooding, frost, or various developmental problems.

Population number

According to the Defenders of Wildlife resource, the total population size of the Bog turtle ranges between 2,500 and 10,000 individuals. Currently, this species is classified as Critically Endangered (CR) on the IUCN Red List.

Fun Facts for Kids

  • The Bog turtle is the smallest species of turtle in North America.
  • Although the Bog turtle is similar in appearance to the Painted or Spotted turtles, its closest relative is actually the somewhat larger Wood turtle.
  • The Bog turtle is the state reptile of New Jersey.
  • Male Bog turtles are territorial and will readily attack other males if they venture within 15 centimeters (5.9 in) of his position. An aggressive male will crawl toward an intruder with his neck extended. As he approaches his foe, he tilts his carapace by withdrawing his head and raising his hind limbs. If the other male does not retreat, a fight of pushing and biting can follow. The bouts typically last just a few minutes, with the larger and older male usually winning. The females are also aggressive when threatened. They will defend the area around their nest, usually up to a radius of 1.2 meters (3.9 ft), from encroaching females.
  • The age of a Bog turtle is determined by counting the number of rings in a scute, minus the first one (which develops before birth).
  • The shells of Bog turtles offer little protection from predators so their main defense when threatened by an animal is to bury themselves in soft mud. They rarely bite when approached.
  • Bog turtles are usually active after rainfall. During the day males typically move from 2.1 to 23 meters (6.9 to 75.5 ft) and females from 1.1 to 18 meters (3.6 to 59.1 ft).

References

1. Bog Turtle on Wikipedia - https://en.wikipedia.org/wiki/Bog_turtle
2. Bog Turtle on The IUCN Red List site - https://www.iucnredlist.org/species/4967/97416755

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