Monk Seal Fact Files
Mediterranean Monk Seal
(Monachus monachus)
Conservation
Rescue and rehabilitation
With habitat degradation increasing the likelihood of
newborn pups being swept out of caves by storm surges and
becoming separated from their mothers, rescue and
rehabilitation has assumed particular importance among
conservation priorities. To date, orphaned monk seal pups
have been rehabilitated in specialised facilities in
Greece, Madeira, Mauritania, and the Netherlands (prior to
the establishment of a dedicated unit in the Northern
Sporades Marine Park).
In Madeira, only one orphaned pup has so far been
rehabilitated in a unit established in the Desertas
Islands Nature Reserve (Neves & Pires 2001).
In Greece, the rehabilitation programme established by
the NGO MOm
in association with the Seal
Rehabilitation and Research Centre of Pieterburen,
the Netherlands, works in tandem with a rescue alert
network operating throughout coastal Greece.
The Rescue and Information Network (RINT) founded by MOm
has been operating for 14 years, and relies on a coastal
network of port police officials, fishermen and others to
report monk seal strandings, including dead, sick, wounded
and orphaned animals (Adamantopoulou 2000, Johnson (ed.)
2004d).
In the early 1990s advising scientists postulated that,
with a sufficiently developed network, as many as 20
orphaned monk seals might be rescued annually in the
Aegean (Bellerive 1991, Johnson 2001a).
Such optimistic forecasts, however, have failed to
materialise, despite the formation of a network that
generates significant sighting and alert information.
Sporadic rescues over the years have made it difficult to
raise the necessary funds to build and maintain a
dedicated monk seal rehabilitation facility in the eastern
Mediterranean. An ambitious 1992 plan was subsequently
shelved as a result of cost concerns and lack of candidate
animals (Johnson 2001a).
In addition, monk seal pups brought into temporary
captivity for the purposes of rehabilitation have not
always responded well to treatment, for reasons difficult
to quantify because of variation of individual
circumstance and limited comparative data. Age,
pre-existing condition, injuries sustained in stranding,
available veterinary care and time interval between
stranding and rescue may all play a part in a pup’s
response to treatment and its chances of survival.
A significant number of pups in rehabilitation suffer
from gastro-intestinal complications, possibly because
their digestive tracts have not developed sufficiently to
assimilate the fish porridge and whole fish on which they
are traditionally fed in captivity (E. Androukaki pers.
comm. 2004). A milk formula used during some Mediterranean
monk seal rehabilitations as a mother’s milk substitute
was discontinued in Greece following complications (t’Hart
& Vedder 1990, SRRC/HSSPMS 1991, Androukaki 2005a).
Since 1987, 16 orphaned monk seals originating from
Greece have undergone rehabilitation (3 at the SRRC in
Pieterburen). Of these, 7 have been released into the
protected waters of the Northern Sporades Marine Park and
9 have perished (Androukaki 2005b, Komnenou 2005, SRRC
2005).
There has been no systematic use of tracking devices
which, aside from gathering biological data, can also
offer some indication of the fate of the released seal.
Two pups rehabilitated at the SRRC were equipped with
radio telemetry devices when released in the Sporades in
1988. Although termed a success, the animals being tracked
over several months by boat and plane, the experiment was
not repeated in subsequent releases (Reijnders & Ries
1989, t’Hart & Vedder 1990). The pups did not remain
within the Sporades Marine Park, emphasising once again
the importance of conservation education activities beyond
MPA borders.
Satellite tracking devices have been used on seal pups
rehabilitated in Mauritania on four occasions since 1997
(Cedenilla et al. 2002, Cedenilla & de Larrinoa 2004a,
2004b), and in Greece in 2004 (Johnson ed. 2004e).
More advanced than radio telemetry, satellite tracking
can yield significant data on post-release movements and
diving (Cedenilla & Fernandez de Larrinoa 2004a,
2004b, Johnson ed. 2004f). Satellite data may also be more
effective in providing assurance that the released animal
has survived its return to the wild, since the technology
is not bound by the same range limitations as radio
telemetry. Satellite tracking devices are capable of
functioning for several months before battery die-off or
being shed (as intended) with the animal’s first moult
(Johnson ed. 2004f).
Two rehabilitated pups have been reported dead following
their release. A pup that had undergone a prolonged
11-month rehabilitation at Cabo Blanco in 1998 is thought
to have become entangled in one of the numerous gill nets,
set by industrial fishing boats operating illegally in the
area, in the days following its release. More recently, in
September 2004, the corpse of a rehabilitated pup released
in 2002 was found partially buried on a beach on the Cabo
Blanco peninsula (outside the protection zone and routine
surveillance), the injuries sustained suggesting that she
had been killed opportunistically for meat and fat.
Spanish technicians in the area concluded that the seal
had become imprinted on humans during her rehabilitation,
and that her tameness following release contributed to her
death; they called for rehabilitation protocols to be
adjusted accordingly (Cedenilla & Fernandez de
Larrinoa 2004c).
Despite various practical challenges, rescue and
rehabilitation of orphaned seal pups has demonstrated an
extraordinary ability to focus local, national and
international public attention on the monk seal cause, and
generate significant public sympathy and goodwill for the
species (Johnson 1993 & 2001a, Johnson ed. 2004e).
A rescue network is currently being established in Turkey
with Greek technical assistance and EU funding (Johnson
ed. 2004d).
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