SEA
TURTLES Sea Turtles have been around for 95 million
years. Their ancestors were giant land turtles that
entered the sea ages ago when the great dinosaurs lived.
The first sea turtles looked little like those of today.
It took millions of years for sea turtles to change,
for legs to become pad-shaped flippers and for heavy,
bulky bodies to flatten into lighter, streamlined shapes.
The dinosaurs and the giant land turtles are gone forever;
we can see only their fossil bones in museums. But,
somehow, sea turtles have lived on. Seven different
kinds still swim in warm and temperate oceans around
the world. They spend their whole lives in the water
except for the brief times the females come onto land
to nest and lay their eggs. The sea turtles share the
sea with fish, whales, other sea creatures and you and
me. In the seas surrounding Turkey, two species of sea
turtles live: Loggerheads (Caretta caretta) and Green
Turtles (Chelonia mydas). The Green Turtle When Chirstopher Columbus discovered the New World,
there were millions of sea turtles in the Caribbean
Sea. Columbus and other explorers, traders, settlers,
and pirates who followed him soon found out that one
kind of sea turtle had
especially tasty meat. This
turtle was brown all over, grew to about three
feet in lenght, and often weighed some 300 pounds.
It grazed in shallow beds of grass, or turtle
grass, near the shore. Sailors could easily capture
the gentle animal. They could turn it over onto
its back so it was helpless, tie its flippers,
and keep it aboard their ships to slaughter when
they needed fresh meat. The fat inside this turtle’s
body was green from the grass it ate, so it was
named the green turtle. It is the only sea turtle
that lives only on plants. Today, hundreds of
years later, green turtles are still hunted and
taken. Fewer and fewer remain. The Loggerhead
The loggerhead turtle is
slightly smaller than the green. A loggerhead
may weigh between 300 and 400 pounds. It
eats crabs and other sea animals for its
food. The loggerhead hunts near coral reefs
and rocks. You can recognize it by its large,
thick head and broad, short neck. The loggerhead,
like other sea turtles, cannot pull its
head into its shell the way land turtles
can. Its shell is like a suit of armor,
but its head and flippers are unprotected.
Certain sharks and killer whales may attack
these parts, but the loggerhead is big and
fast and has few natural enemies. Colour
its carapace and skin
reddish-brown and the plastron yellow.
The Green Turtle Nesting A female green turtle arrived offshore at her nesting
beach alone at night. She had mated earlier with a male
green turtle nearby in the water. It was time for her
to lay her eggs. She might nest three or four times
during a single nesting season. Though she is fast and
well suited to the water, she is slow, awkward, and
in danger on land. The female dragged herself out of
the sea and onto the beach up beyond the reach of high
tide. She dug a pit for her body with her flippers.
She nestled in it and used her back flippers, like shovels,
to scoop out a bottle-shaped hole. Now she drops about
one hundred white, leathery eggs that look like ping
pong balls into this hole. When she finished, she will
cover the nest with sand and slowly lumber back to the
sea, leaving a trail behind her. After she is gone,
poachers may follow this trail and steal her eggs...
or a hungry fox may feat on them.
The Hatchlings The rays of the sun heat the beach, warming the
turtle’s eggs buried in the sand. The eggs develop in
the nest. They are ready to hatch in about two months.
The patchlings pick at their shells with a small, sharp
point at the front of their snout—this particular part
will disappear after hatching. The hatchlings crack
their shells. All must hatch at almost the same time,
for all must share the work to escape from the nest.
The baby turtles scrape away at the sand overhead. The
sand falls upon their empty shells, forming a platform
that allows the hatchlings to rise. In a few days, they
have scraped their way up to the roof of the nest. Then
at night, or in the early morning, little dark heads
and flippers wriggle out onto the beach. Two-inch long
hatchlings crawl away and look for the sea.
Race To The Sea
The hatchlings sense the direction of the sea. The birghtness
over the water attracts them. They stream from the nest
and begin their race to the sea. Full of life, but defenseless,
they struggle clumsily across the beach. Their shells
are soft and offer little protection. Swift lizards
attack them. Armies of crabs pick them off. Sea birds
gather and catch the tiny turtles in their sharp beaks
and feast on them. Few hatchlings make it to the water.
And most of these will be eaten by fish: snappers, groupers,
jacks, and sharp-toothed barracudas. Only one or two
of the hatchlings may live. Where they go to spend their
first year of life is a mystery. It is one of nature’s
many secrets. Green turtles, for example, are not seen
again until they are one year old when they are found
feeding offshore in turtle grass beds. They are then
as big as a dinner plate.
Where Sea Turtles Nest? Sea turtles nest in a wide, warm belt around the
world. They all return to the same beach where they
themselves hatched in order to lay their eggs when they
reach maturity. This ability to swim sometimes thousands
of kilometers to reach their beach of origin is still
a mystery to the scientists who think that their sense
of smell plays an important role in this. All sea turtles
in the world—the Mediterranean, the Atlantic and the
Pacific populations are endangered species. Turtle specialists
think that some of the Mediterranean sea turtles migrate
from the Atlantic whereas some only stay in the Mediterranean
basin. Conservationists and researchers try to determine
sea turtle migration routes by placing special talgs
on the turtles.
Sea Turtles? Or Turtle Products?
The sea turtle is disappearing. And once it is gone,
it will be gone forever. One reason it is disappearing
is because people use parts of turtles for food or,
more often, to make different products. The hawksbill
is prized for its carapace to make tortoiseshell combs,
brush handles, eyeglass frames, buttons, hair clips,
and jewelry. Hawksbill and green turtles are killed
so they can be stuffed and hung on walls as decorations.
Green turtles are slaughtered for their meat and in
order to make turtle soup. The skin from the neck and
flippers of greens and olive ridleys is made into leather
for purses and shoes. Fat from turtle bodies is used
in soaps and make-up creams. Instead of using plentiful
resources for these products, the world’s few remaining
sea turtles are taken.
Turtle Hunting
People who live near the shore have always hunted sea
turtles to help feed their families. A fisherman might
harpoon a sea turtle and take it home to eat. Groups
of men netted sea turtles when they rose to breathe
and brought them back to their villages for food. For
years, when sea turtles were plentiful, such hunting
seemed to have little effect on the numbers of turtles.
But the demand for sea turtles kept growing. Money could
be earned hunting and selling sea turtles. Money could
be earned selling things made from turtles. Turtle hunting
became profitable. So hunters took hundreds of turtles
in the sea and even on the land, when they were nesting.
Fewer and fewer sea turtles were left until they were
almost all gone. Laws now protect sea turtles and forbid
trade in turtle products. But not everyone obeys these
laws.
Trawlers and Turtles
Commercial fishing boats around the world provide food
from the sea for people. These vessels cruise coastal
waters, dragging large nets along the sea bottom to
gather in their catch. Trawling or scraping of the sea
bottom is very detrimental to sea life in general because
it destroys the breeding grounds of fish, shrimp and
all marine life. Unfortunately, sea turtles are often
caught accidentally in these nets. The great funnel-shaped
nets of shrimp trawlers, for example, trap many loggerhead
turtles. The turtles are swept along in the nets with
the shrimp. They are not able to come
up to the surface to breathe, and they drown. So the
small numbers of sea turtles are reduced even further.
A way has to be found to solve the problem. Shrimp fisherman
along the southeastren coast of the United States are
helping to find an answer. They are testing newly-designed
nets that let the shrimp in but keep the turtles out.
No Place To Nest A loggerhead turtle crawls from the sea to the edge
of a beach in Side on the Turkish South Coast. She pauses.
What does she see? Apartment houses and hotels take
up much of the beach. Only a narrow strip of sand remains,
and it is crowded with people. In some places cement
has been poured across the sand clear to the edge of
the water. There is no place for the turtle to nest.
The turtle goes back to the sea and returns at night.
Hundreds of lights shine out from windows. The beach
is bright. Elsewhere, along the coast, another turtle
finds a small, undeveloped piece of beach and lays her
eggs. When they hatch, the young turtles crawl toward
the brightness, but it is not the sea. It is the light
of street lamps along a road that passes nearby. The
hatchlings will die in the burning sun later that day.
Once there were hundreds of miles of open shore for
loggerhead sea turtles to nest on safely. It is different
now.