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The only living member of the genus Caretta, the Loggerhead sea turtle
can grow up to an intimidating 364 kg and 1.1 metres long. The species
is so named for the turtle's over-large head punctuated by a set of
strong jaws suitable for feeding on a wide range of sea life from
mollusks (whelks and conch) to crustaceans (crabs and shrimp) to fish
and jellyfish. They have also been known to consume small or immature
marine animals such as sea birds and mammals.
Loggerheads
have a large habitat ranging from the Atlantic and Pacific Oceans to
the Indian Ocean. Atlantic migratory routes span from Newfoundland to
Argentina with breeding and reproduction taking place in the warm
waters of the southern hemisphere. Some Loggerheads are known to
hibernate rather than pursue the challenging migratory patterns. For
females this is most likely in the 2-3 year period between egg cycles.
The
mating season spans several months - from March to June - and female
egg laying continues into September. The nesting female will lay up to
150 eggs in deep nests which she digs in the soft sand of the same
beach where she hatched 35 or more years earlier. She uses her flippers
to cover the eggs, forming a protective mound that keeps the eggs safe
from beach-going predators much, but not all, of the time. The tiny
hatchings, which weigh about 20 grams and measure a scant 45 mm in
length, emerge after a two-month incubation period. Those that make it
from nest to sea and through the surf line to open water will swim for
several days to find deep water downwellings that offer moderate
protection from tossing seas in rich debris fields of seaweed and other
floating materials.
As with all eco-sensitive species, the
Loggerhead populations have been in decline for decades. Annual nesting
estimates worldwide reveal fewer than 150,000 nests per year in all
traditional Loggerhead nesting areas. Adults easily become ensnared in
gill nets, long-lines, traps and pots. Dredging also claims a number of
turtles each year.
The large migratory territories of the
Loggerhead require global cooperation to ensure that protective efforts
will be successful. The Convention on International Trade in Endangered
Species of Wild Flora and Fauna makes trade of any part of this species
unlawful, affording it some protection from human predation. Several
countries share agreements that expand protection for the feeding and
nesting areas and many have imposed bans on shrimp to force changes in
the trawling gear to make it less hazardous to Loggerheads and other
routinely ensnared deep sea turtle species.
Conservation efforts
include the hatch and release of nests that are discovered in
threatened or unsuitable areas. The eggs are carefully counted and
transported to an incubation facility. The young are raised until they
are strong enough to survive on their own and released into the ocean
from the same beach that housed their nest. This imprints the hatchling
on the spot and increases the likelihood that it will return to
continue the cycle when it reaches sexual maturity three and a half
decades later
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