Finding how many Coquerel's sifaka exist

Jan 29, 2014
Coquerel's sifaka. Credit: Lounès Chikhi, IGC

In a study now published in the American Journal of Primatology, Célia Kun-Rodrigues and Jordi Salmona, from Lounès Chikhi's laboratory at the Instituto Gulbenkian de Ciência (IGC) provide the first abundance estimates of Coquerel's sifaka (Propithecus coquereli), an endangered lemur species, in its last main refugium, the Ankarafantsika National Park (ANP) in Madagascar.

Madagascar is one of the hottest biodiversity hotspots, well known for the diverse of lemurs living there. The Coquerel's sifaka is one of the lemur species that has been classified by the International Union for Conservation of Nature (IUCN) as an "endangered" species.

Despite this status, no reliable population density or abundance estimates were available until now that could be used in the planning of conservation strategies. It has been known that Coquerel's sifaka survives in small areas of the highly fragmented forests, and in the ANP, the largest forested area in northwest Madagascar with about 1000 km2.

The fieldwork developed in the ANP allowed Kun-Rodrigues and Salmona to determine that the density of the Coquerel's sifaka population was dramatically different among the surveyed sites, varying from 5 to 100 individual per km2. Sites closer to rivers have a higher density, whereas those closer to roads and forest edges present a lower number of sikafas. Furthermore, the researchers observed a major decline of the population in the last 20 to 30 years, reaching a decrease of more than 90 percent in at least one spot of the park. It is difficult to estimate the number of individuals of Coquerel's sifaka living in the ANP since densities appear to vary widely across the park. But a preliminary estimation of the total population size in the ANP made by the researchers indicates approximately 47,000 individuals. Habitat loss and poaching are probably the major factors that contribute to this species decline.

Lounès Chikhi says, "We believe that conservation actions are required at the community level but also at a wider geographical scales to reduce charcoal consumption in nearby towns and deforestation fueled by foreign demands."

Jordi Salmona adds: "If nothing is done to protect Coquerel's sifaka, low densities such as 5 to 10 individuals per square kilometer may extend to the whole ANP. This would mean that in the next decade or two, a of just 5,000 individuals could be reached."

Explore further: Solitary lemurs avoid danger with a little help from the neighbours

More information: Kun-Rodrigues, C, Salmona, J, Besolo, A, Rasolondraibe, E, Rabarivola, C, Marques, T, Chikhi, L. (2014) New Density Estimates of a Threatened Sifaka Species (Propithecus coquereli) in Ankarafantsika National Park. Am. J. Primatol. Jan 17 [Epub ahead of print] DOI: 10.1002/ajp.22243

add to favorites email to friend print save as pdf

Related Stories

Lemurs the world's most threatened mammal: study

Jul 14, 2012

Lemurs, the furry apes brought to fame by the Disney animation film "Madagascar", are the most endangered mammals on Earth, an International Union for Conservation of Nature conference found.

Recommended for you

Sharks contain more pollutants than polar bears

21 hours ago

The polar bear is known for having alarmingly high concentrations of PCB and other pollutants. But researchers have discovered that Greenland sharks store even more of these contaminants in their bodies.

Moth study suggests hidden climate change impacts

Apr 15, 2014

A 32-year study of subarctic forest moths in Finnish Lapland suggests that scientists may be underestimating the impacts of climate change on animals and plants because much of the harm is hidden from view.

User comments : 0

More news stories

Patent talk: Google sharpens contact lens vision

(Phys.org) —A report from Patent Bolt brings us one step closer to what Google may have in mind in developing smart contact lenses. According to the discussion Google is interested in the concept of contact ...

Wireless industry makes anti-theft commitment

A trade group for wireless providers said Tuesday that the biggest mobile device manufacturers and carriers will soon put anti-theft tools on the gadgets to try to deter rampant smartphone theft.