IUCN/SCC Otter Specialist Group Bulletin
© IUCN/SCC Otter Specialist Group
Volume 21 Issue 1Pages Pages 1
- 55 (July 2004)
Abstracts
Why Philosophers Should Be Interested In
Otters, And Why Otters Should Be Interested In Philosophy
Pages 5 - 9 (Viewpoint)
Bram E. van Liere
Abstract
In this article the reintroduction of otters in the Netherlands is discussed
in the light of the debate in academic philosphy between ecocentric and biocentric
philosophy. The ethical judgement of both ecocentric and biocentric philosophers
on reintroduction are extracted and reviewed. The debate described in this
article shows the ethical difficulties of the reintroduction of otters in the
Netherlands and of reintroductions in general.
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Neotropical River Otter Micro-Habitat Preference
In West-Central Chihuahua, Mexico
Pages 10 - 15 (Article)
Eduardo Carrillo-Rubio, Alberto Lafón
Abstract
We characterised habitat selected by the Neotropical otter (Lontra longicaudis)
in the Río San Pedro, located in the central portion of the State of
Chihuahua in Northern Mexico. We monitored a 30 km stretch of the river for
over two years and compared micro-site habitat characteristics at 21 used and
25 random sites. Characteristics of habitat preferred by the otter included
pools that averaged >0.8 m deep, >14.6 m wide, >64% under-story vegetation
cover, and rock talus/vegetation cover within 4.8 m.
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(241 K)
Captive Reproduction Of The Neotropical
Otter In The Santa Fe Zoological Park In Medellin, Colombia
Pages 16 - 18 (Report)
Diego A. Arcila, Marcela Ramírez
Abstract:
Knowledge regarding reproduction of Lontra longicaudis is lacking. We
present the first experience of Neotropical river otters born in captivity
in Colombia. Of three parturitions registered, only one was successful. The
gestation period for L. longicaudis was estimated at 86 days, with no
evidence of delayed implantation. This kind of pregnancy can be classified
as short and variable. We recommend further research efforts regarding behaviour
and reproduction of Neotropical otters in captivity.
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The Eurasian Otter in the South Caucasus
Pages 19 - 23 (Report)
George Gorgadze
Abstract:
Seven species of Mustelidae are to be found in the south Caucasus (Armenia,
Azerbaijan and Georgia): Lutra lutra, Martes martes, Martes
foina, Meles meles, Mustela vison, Mustela nivalis and Vormela
peregusna. The rarest of these species are the Eurasian otter (Lutra
lutra) and the marbled polecat (Vormela peregusna). The Eurasian
otter, one of most endangered species of the south caucasian fauna, is still
suffering under the influence of poaching, habitat loss, disturbance and pollution.
No fundamental research has been undertaken on otters in any of the south Caucasian
countries and, therefore, data provided in the literature are scarce. Further,
no DNA analysis has been undertaken in this part of the world and, therefore,
the actual number of subspecies is not clear.
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The Neotropical Otter Lontra Longicaudis Feeding
Habits In A Marine Coastal Area, Southern Brazil
Pages 24 - 30 (Report)
Gisele G. Alarcon, Paulo C. Simões-Lopes
Abstract:
The feeding habits of Lontra longicaudis have been studied in several
areas in South America. In Brazil, the studies are concentrated on the species'
feeding habits in fresh water ecosystems. Different authors reported the use
of marine waters by L. longicaudis, although fresh water ecosystems
were found to be the main environment providing food for this species. In the
Environmental Protection Area of Anhatomirim in Southern Brazil, the marine
environment proved to be the main feeding habitat for L. longicaudis.
Fish and crustaceans are the main prey groups. Four fish families were identified
and the Scianidae represents 85% of the prey. Intensive use of the coastal
areas and lack of knowledge on the otters' use of these environments can compromise
its conservation in Santa Catarina coastal habitats.
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New Information About The Behavior
Of Lontra Longicaudis (Carnivora: Mustelidae) By Radio-Telemetry
Pages 31 - 35 (Report)
Eduardo Nakano-Oliveira, Roberto Fusco, Etiene A. V. Dos Santos, Emygdio L.
A. Monteiro-Filho
Abstract:
During the development of a study about a community of carnivorous mammals,
an otter was captured and equiped with a radio transmitter in an area of mangrove
in the south coast of the State of São Paulo, southeast of Brazil. This
study verified that: 1 - the animal used at least three burrows without communication
between them. 2 - the most used burrow was at a distance of 2,6 km from the
capture place; 3 - this individual usually moved between two islands that were
separated by an estuary whose medium width was of approximately 1 km; 4 - it
spent a long period on a small island of approximately 0,06 Km2 where a muddy
substratum prevailed, not allowing the construction of a burrow. In spite of
the little time that the otter stayed with the radio-transmitter, the data
obtained are of relevant importance as they show an unknown activity pattern,
besides showing in a short period some patterns of burrow use. Even though
the otter removed its radio-collar, it didn't cause any damage to the individual
and it allowed the registration of behaviour patterns that had not been described
before. Based upon the radio-transmitter as adapted, new perspectives open
up for the effective study of this species, increasing the possibilities of
obtaining data about activity patterns and home range for Lontra longicaudis.
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Scats And Glue - A Cheap And Accurate Method
For Mapping African Clawless Otter Aonyx Capensis (Schinz, 1821)Territories
In Riverine Habitats
Pages 36 - 39 (Report)
Mordecai O. Ogada
Abstract:
Accurate mapping of otter territories has hitherto been done by means of telemetry.
However, the widespread use of telemetry has curtailed the study of otter territorial
behaviour in resource-poor countries, particularly in Africa. Researchers in
Africa generally do not have the resources to invest in telemetry equipment
and tracking vehicles and aircraft. The implanting of transmitters in otters
is a highly invasive procedure that requires a high standard of veterinary/
animal handling skills and the risks are high. African clawless otters forage
in family groups and these animals share a clan terrintory along a stretch
of coastline or riverine habitat. This territory is regularly marked by deposition
of spraints, mostly on rocks and other prominent features on the riverbanks.
In the course of this experiment, the artificial transfer of scats from known A.capensis holts
into neighbouring family territories was found to elicit a prompt response
from the resident family group. When the process is repeated in both directions,
i.e. scats from territory A into territory B and vice versa, it gave a highly
accurate estimate of territorial boundaries and when repeated over time can
give an indication of seasonal variation in territorial behaviour.
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Giant Otter Project In Peru: Field Trip And
Activity Report - 2005
Pages 40 - 46 (Report)
Jessica Groenendijk, Frank Hajek
Abstract:
The project "Status, habitat, behaviour, and conservation of Giant Otters
in Peru" of the Frankfurt Zoological Society - Help for Threatened Wildlife
(FZS) is now in its 15th year and progress has been reported continually in
the IUCN Otter Specialist Group Bulletin (SCHENCK and STAIB, 1992, 1995a, 1995b;
SCHENCK et al. 1997, 1999; STAIB and SCHENCK, 1994; GROENENDIJK et al., 2000,
2001; GROENENDIJK and HAJEK, 2002, 2003). The giant otter (Pteronura brasiliensis)
was uplisted from 'vulnerable' to 'endangered' by IUCN in 2000 with habitat
destruction in South America currently posing the greatest threat to the species.
Activities in Peru have been geared toward developing a national integrated
conservation strategy, incorporating research and monitoring, environmental
education, management of human activities in giant otter habitats, capacitation
and awareness-raising, networking, and the creation of a distribution database
and mapping facility.
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(74 K)
Change Of Partners In A Giant Otter Alpha
Couple
Pages 47 - 51 (Report)
Emanuela Evangelista
Abstract:
Very few data are available on the social behaviour of giant otter (Pteronura
brasiliensis). In this note I report a change of partners in a giant otter
alpha couple observed in the Xixuau Reserve in Roraima, Brazil. The male of
the breeding pair disappeared and was replaced by another adult male, previously
sighted within the group's territory. The calf of the original alpha couple
survived the whole transition and was adopted by the new adult male; the group
remained stable in its new form and one year later the couple had a litter
of two cubs. For each individual, the frequency of alarm behaviour was recorded
and the results show an adjustment of the alpha female to the different behaviour
of the two partners.
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