Sea
Turtles, or honu (pronounced hoe'-new),
once came close to extinction years ago because
they were hunted for their beautiful shells, tasty meat and people
gather their eggs for ornaments. The activities of human beings are a
serious threat to the survival of many turtles, and turtle conservation
must improve to prevent certain species from becoming extinct. There are
more than 40 kinds of turtles that are endangered. These rare turtles
include many types of tortoises but mostly sea turtles.
Today these turtles are protected
by the Endangered Species Act of 1973. Even though it looks like their
numbers are growing, there are fewer females returning each year to
nest.
Green sea turtles are sometimes
spotted in tide pools feeding on seaweed (limu). They are the fastest
swimmers, they can swim for brief periods at a speed of nearly 35 miles per hour, but on land they are slow.
Turtles are curious and often swim close
to divers. Make sure you let the turtles come to you, you will be
rewarded for your patience.
During
recent years, green sea turtles have begun to crawl out on the
sand and rocks to bask and rest, primarily during daylight hours.
This
basking is a natural behavior special to the Hawaiian green turtles. Sea
Turtles are reptiles which are cold- blooded animals, which means they
can not make their own body heat and need the environment to warm them.
So when the honu come to shore to sun and rest, PLEASE let them rest..
Hawaiian Green Sea Turtles
are a THREATENED Species protected by both state and federal law. IT IS ILLEGAL TO DISTURB THEM IN THE OCEAN OR ON THE
BEACH and fines can be imposed for doing so.
All
turtles, including sea and freshwater species, lay their eggs on land. A
green turtle may lay as many as seven clutches (groups) of eggs during
one breeding season. About 45% of the time, the female exits the water,
crawls the beach for long distances and reenters the water without
digging a nest. These are called "false crawls" and usually
occur because the turtle was disturbed or it could not find a
"good" nest site. It is believed that a female turtle
will return to the same beach where she was born.
Incubation of the nests takes about 50-55 days.
The temperature of the eggs influences the sex of the baby turtles.
Example, a warmer temperature produce female turtles. After the
incubation period, the hatchlings emerge from the nest
in masses. Using various environmental and inherited cues, they quickly migrate to the water's edge. If artificial lights are lighting the beach, the hatchlings will be disoriented, travel in the wrong direction, and possibly never make it to the water.
That's why you hear the saying Light Out for Turtles!
Once in the water the hatchlings swim directly out to sea, facing a perilous struggle to survive to adulthood. The best scientific estimates available indicate that only one in 1,000 to 10,000 hatchlings will survive (anywhere from 12 - 50 years) to become a reproducing and nesting adult sea turtle.
The two known predators to the sea
turtles are (tiger) sharks and people. We can't do much about the
sharks, but maybe we can make a difference with people through education
and awareness.
The maximum age of adult turtles is not known.