Description
The Leatherback Turtle is an enormous sea turtle
reaching over 2 m in length and weighing more than 900 kg. It has
an elongate triangular carapace covered
with smooth skin and 7 prominent keels. It has no scutes. The carapace is gray, brown or black in colour
and is covered in small white, yellow or pink blotches, as our the
head and legs. Females have more pink on the top of the head than
males. The plastron is white with five
ridges. The limbs are paddle-shaped and lack claws.
Confusing Species
The prominent keels and lack of scutes distinguish the Leatherback Turtle
from any other species seen in Canada. In fact it is the only
living species with these features. All other marine species have
claws, a bony carapace and scutes.
Distribution
The Leatherback Turtle is found in both the Atlantic
and the Pacific oceans and has been seen around Vancouver Island
and the Queen Charlotte Islands in British Columbia as well as
Newfoundland and the Maritime provinces. It is one of the most
widespread reptiles ranging throughout much of the Atlantic,
Pacific and Indian Oceans.
Habitat
Leatherback Turtles are found in bays and estuaries as
well as the open sea. Nesting occurs on a small number of beaches
with fine sand and a deep water approach.
Reproduction
Leatherback Turtles do not breed in Canadian waters.
Females migrate to tropical or subtropical areas where they drag
themselves up on beaches at night to lay their eggs. A female will
lay several clutches of 50-166 eggs in a season but then may not
lay again for another 2-3 years. Most Atlantic turtles nest from
April to July while most Pacific turtles nest from November to
January.
Eggs hatch in 50-78 days. All the hatchlings from a nest emerge
together and rush towards the sea. The young are 5-7 cm at length
at this time. The sex of hatchlings in determined by the
incubation temperature of the eggs.
Natural history
Very little is known about the behaviour of these
turtles in open water. Their preferred prey are oceanic jellyfish
but they also eat sea urchins, octopi, squid and a variety of other
animals as well as some algae and kelps. Unlike most reptiles,
Leatherback Turtles generate internal heat metabolically. It also
has special glands for secreting excess salt.
Conservation Concerns
Because of their preference for jellyfish, Leatherbacks
may accidentally eat plastic bags which block the digestive tract
and kill them. Both adults and eggs are hunted by people and
nesting beaches are vulnerable to habitat degradation. The
Leatherback Turtle is considered Endangered in both Canada and the
United States. The following conservation efforts are ongoing:
Nova
Scotia Leatherback Turtle Working Group -
The Nova Scotia Leatherback Turtle Working Group is a collaborative marine turtle research and conservation
initiative involving fishermen and university-affiliated biologists in Atlantic Canada. On this Web site, you can
learn about sea turtles, their research, and you can even track a leatherback turtle as it makes its way through
the Atlantic Ocean.
Vancouver
Aquarium The
Vancouver Aquarium has started a Leatherback Turtle Awareness Program,
to learn more about these endangered turtles that use British Columbia
waters as one of their habitats. We are asking for help to
report any sightings of sea turtles in coastal communities. In
exchange, teachers, students, and community groups are provided with
learning activities that will show us what we can do to help the
Leatherback turtles. Visit their website to find out more about
their Awareness Program.
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