By Turtle Times
Northern Map Turtles are the most common and widespread species of map turtles. Females’ carapaces can reach a length of up to 27 cm (10,5 in). Males are typically shorter than 16 cm (6.25 in). The females are larger and have a larger jaw, but the difference isn’t as great as in other turtle species. The carapace of the olive-green turtle is covered with a complex system of yellow lines, which resembles a topographical chart. The patterning can be hidden by the dark pigmentation of females, or algae. The skin of the northern map turtle is olive-brown to dark brown with yellow or greenish markings. The midline of the carapace is a distinct keel that is shallow, but not pronounced. It lacks spines or knobs. The postorbital blotch of these turtles is always a triangle-shaped blotch. The turtles also have a yellow j-shaped line that is curved upwards as it approaches the head.
Habitat and Distribution: Map turtles are a widely distributed species that can be found as far north as Quebec, and as far south Alabama and Arkansas. They live in the drainages of the northeast that drain into Atlantic Ocean. They are also found in several drainages in the southeast that empty into Gulf of Mexico. However, they do not inhabit much of the Mississippi River and adjacent waterways. This species prefers large bodies of water such as rivers, lakes, and large streams to creeks and ponds. Although they are cautious baskers, they require a lot of basking areas. Northern map turtles prefer clear, flowing water habitats with gravel substrates.
Reproduction & Development: Breeding takes place in the spring as well as fall. The majority of nesting is likely to take place between late May and mid-July. Hatchlings often delay their emergence until winter. The eggs hatch late in the summer. Nests are usually built on sandy beaches, sandbars or open areas rather than in wooded areas. The nests are always near the water. Laying eggs can take several hours. It usually begins at night and continues until morning. The average clutch size is 10-12 eggs, with females producing two or three clutches per year. As with other turtle species, the incubation period, which lasts 75 days, determines the sexe. The warmer temperatures result in females, while the cooler temperatures produce males. Males reach sexual maturity in 4-6 years while females can take up to 10 years.
Habits Hatchlings move quickly downstream to find a summer home range. Adults spend most of their time active during the daylight …read more
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