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The Ring-tailed Lemur ( Lemur catta )

The Ring-tailed Lemur ( Lemur catta ). Karl Stefan. About the Ring-tailed Lemur. Can live as long as 20+ years in captivity Can live up to 15 years in the wild although few females make it to this age (generally 10) Males usually don’t live past 10 years

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The Ring-tailed Lemur ( Lemur catta )

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  1. The Ring-tailed Lemur (Lemur catta) Karl Stefan

  2. About the Ring-tailed Lemur • Can live as long as 20+ years in captivity • Can live up to 15 years in the wild although few females make it to this age (generally 10) • Males usually don’t live past 10 years • Can have 1 to as many as 3 offspring at a time. • Populations will break off into troops, which may grow, die, or go through troop fission. • Very sensitive to habitat change (not yet an endangered species but could be on account of this), but has the ability to rebound very quickly in most cases. • They live in multimale-multifemale social groups, and exhibit female residence and male dispersal

  3. Study Sites • BezaMahafaly Reserve (Madagascar) • Berenty Reserve (Madagascar) In this study, the current population for each site was estimated and compared. The estimations were based on previous data, which includes natural and human influences on productivity and survivability..

  4. Beza Mahafaly • The study focuses on the ring-tailed lemur population that resides in Parcel 1, the smaller, 80 ha area of gallery forest. • L. Catta gives birth at age 3 • Affected by drought. As much as 80% infant mortality occurred during 1991-1992 drought. Juveniles and adults less effected • Still around 30% mortality for adults. • Data was collected from several studies from 1987-2003.

  5. Survivability was: Young (ages 0-2) .725, Mature ( ages 3-4) .8, Prime (ages 5-8) .97. • The productivity was: Young – 0, Mature - .8, Prime - .93 • Growth rate (lambda)= 1.3735

  6. Berenty Three areas: • Tourist area provides provisions for Lemurs causing major increase in population in that area • Gallery forest provides normal conditions and normal problems such as reduced vegetation from droughts • The Scrub provides low densities and is increasing in area

  7. Young (age 0-1) - .623, Juvenile (age 2) - .6, Mature (ages 3-4)-.45, Prime (ages 5-8) -.88 • The productivity was: Young - .11, Mature - .65, Prime -.81 • Growth rate (lambda)= 1.0442

  8. Drought in Beza • In 1992, during the second drought year, 48 females had 30 infants (63%) of which only 6 remained after 6 months, giving a 1-year survival rate of 20%. • 1994 the 27 remaining females had 27 infants, or a 100% birth rate, of which 22 survived for 6 months

  9. Conclusions Female lemurs produce offspring as early as 2 years and continue to produce offspring regularly throughout their lives (after 8 years significant decrease). This strategy is another kind of evolutionary response to the unusual climate and environmental conditions under which this species has evolved. Human influences and environmental conditions can increase populations (Berenty primarily) that may need to be managed because they over harvest vegetation and destroy habitat

  10. Conclusions At the same time, L.catta is a popular species to locals and tourists. Its abundance may be important for both aesthetics and the ecosystem. Interbreeding, disease, and competition with brown lemurs can cause significant population declines. Habitat in Berenty may need to be managed so the Scrub zone does not continue to increase from human or environmental factors. Beza must be left untouched, as L. cattais in synch with the environmental conditions that occur there and its population is managed naturally

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