Sea Turtle Program of Carate
and Río Oro 2002
by Rachel Silverman
Sea spray drifts along the black sand beach
and the adjacent jungle like a cloud in the moonlight as an
Olive Ridley sea turtle lumbers up the beach to deposit more
than one hundred eggs in the sand. She is following in the
flipper steps of her foremothers, completing her mission in
life and digging a sandy nest to help her species survive.
The female turtle is unaware of the many dangers that await
her offspring; she doesn’t even see the small group
of people huddled in the dark observing her every move in
the surreal glow of red-filtered flashlights.
Thousands of turtles come up to nest on the
beaches of the Osa Peninsula every year, and many are greeted
with foes not friends. Poaching and eating of sea turtle eggs
is a popular yet illegal pastime in Costa Rica. The myth that
sea turtle eggs have aphrodisiac effects has been proven false
by scientific investigation and still the demand for them
in bars and restaurants throughout Central America is high.
This drives people from all over the southern Pacific zone
to travel to Río Oro to steal thousands of eggs every
night. Stray dogs, a major problem in all of Costa Rica, also
create havoc for nesting sea turtle populations in the Osa.
Sea turtle nests need approximately 45-50 days incubation
in the sand before babies emerge to scramble down the beach
into the surf. Dogs use their acute sense of smell to locate
these underground chambers at any point and decimate the nests
and/or hatchlings within minutes. Dogs dig up, eat, and destroy
so many nests that Río Oro strays have beautiful fur
coats and huge, distended bellies.
People have been watching sea turtles nest
in Carate and Río Oro for hundreds of years, but now
there are a few that are a little different. There is a new
presence on the beach: the turtle crew from National Save
the Sea Turtle Foundation, NSTSTF, and Salvamento Internacional
de la Tortuga del Mar, SITM. We sit very still until the turtle
digs her nest and starts laying her eggs; then we spring into
action. Red lights flash on, measuring tapes and waterproof
notebooks are brought out of backpacks. The turtle is descended
upon; one person measures her shell as another records everything,
tags are broken out and the turtle is marked; her tracks are
measured and she is inspected for any distinguishing marks
or injuries, all in the five minutes it takes the turtle to
lay her eggs. She finishes, camouflages her nest and, as she
crawls back to the water, the turtlers start to excavate her
nest. One by one the eggs are placed into a plastic container
and packed away into the night to be transplanted, along with
many others, to a safe haven: a guarded rectangular enclosure
with chicken wire walls on the north end of the beach.
A small crew of biologists, volunteers and
members of the local community work together to protect the
eight-kilometer section of sea turtle nesting beach at Carate
and Río Oro, located along the Osa Peninsula coastline
in southern Costa Rica just south of the spectacular Corcovado
National Park. The turtle research crew patrols beaches nightly
and monitors nests daily, during peak nesting season, in order
to keep track of sea turtle activity in Río Oro and
Carate.
The 170 nests relocated to the hatchery in
the 2002 season produced 10,408 hatchling sea turtles that
were released into the sea. The hatchery had a success rate
of 62.3%, which is comparable to other Olive Ridley hatchery
programs in the world, and higher than at the Cayman Island
Turtle Farm. Forty percent of all nests laid between Lagunas
Pejeperrito-Pejeperro were poached by people or dogs, this
means of the approximately 3000 nests laid per year over 1200
nests don’t ever hatch because of human-related activity.
This does not even include all of the possible threats in
nature: tidal inundation, natural predators (ie: coatis, vultures,
pelicans, etc.), beach erosion, bacterial or fungal invasion,
etc. By protecting a small percent of the eggs we can guarantee
that at least a few hatchlings made it to the ocean in 2002.
Seventy-four nesting females were measured and tagged, commencing
the first international tagging program on the Osa Peninsula.
Tagging helps us keep track of the number of females in the
population as well as figuring out their nesting intervals.
Working on the beach at night is a hard yet
fulfilling job; there are poachers, stray dogs, horses, pigs
and other non-native threats to the sea turtles. What keeps
us going is the idea that we can make a difference by showing
our interest and motivation in conserving and protecting this
endangered species.
In addition, we launched an environmental
education program focusing on the Colegio de Puerto Jiménez.
Eco-tourism students received courses in biology, conservation
of natural resources, ecology and the protection of our environment;
special time was given for understanding the importance and
life cycles of sea turtles. These courses culminated in a
field trip to Carate for a night of work with the sea turtle
research team to count nesting females, collect fresh nests,
and release baby turtles. A community workshop was held at
Perla de la Osa, thanks to ASTO (Asociación Salvemos
Las Tortugas de Osa), that drew biologists from around the
country for lectures, videos and activities related to the
status of Costa Rican Sea Turtles. Another smaller workshop
at the Escuela de Río Oro was held for local community
members on whom our work has a direct effect. We have been
distributing informational brochures, posters, stickers and
pens throughout the Osa and Costa Rica, featuring our cartoon
mascot, Uga La Tortuga; you may have seen some around Puerto
Jiménez.
We also recently purchased a small piece
of beachfront property, in Carate, and will start construction
of a field station in order to establish our project on a
permanent basis as well as create a home for future studies
in the area. We will continue monitoring efforts again starting
in May 2003 with beach patrols and the construction of a new
protective hatchery.
NSTSTF and SITM had a stellar first year
of our sea turtle conservation and environmental education
program and will strive to complete our ultimate goal of eliminating
non-native threats to our sea turtle nesting habitat in Carate
and Río Oro. We need help for the construction of the
new biological field station and the running and equipment
costs for the conservation and education project. Any and
all donations and involvement are greatly encouraged; please
help us continue working on this eco-endeavor. Please check
out the NSTSTF website, www.savetheseaturtle.org, and the
new SITM website, www.crseaturtles.org, for more information.
We would like to thank everyone who helped us this year, from
the Osa, throughout Costa Rica, Florida, and the world. Special
thanks goes out to my staff: Fabian Andres Sanchez, Jason
Murray and Helberth Castro.
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