Journal ArticleDOI
Sociogenetic structures, dispersal and the risk of inbreeding in a small nocturnal lemur, the golden-brown mouse lemur (Microcebus ravelobensis)
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Golden-brown mouse lemurs form mixed-sex sleeping groups whose genetic composition is not yet known, and the composition of eight sleeping groups and the dispersal pattern in a free-living population of this nocturnal primate are investigated.Abstract:
Summary Natal dispersal reduces the risk of inbreeding, since it is typically biased towards one sex. Golden-brown mouse lemurs {Microcebus ravelobensis) form mixed-sex sleeping groups whose genetic composition is not yet known. This study investigates the composition of eight sleeping groups and the dispersal pattern in a free-living population of this nocturnal primate. Genetic relatedness and parentage was calculated for 101 individuals (43 males, 58 females) based on microsatellite analyses. Matrilinear relatedness played a major role in the composition of sleeping groups. Co-sleepers were significantly more closely related than members of different sleeping groups. Dispersal was not strongly biased towards one sex. More than 50% of all potential sons (N = 19) and daughters (N = 26) remained in their natal range well into their first mating season, but potential sons disappeared more frequently than daughters lateron. These data indicate that many sons may have delayed their dispersal. This delayed dispersal may have increased the risk of inbreeding, since closely related males and females stayed within one home range diameter of each other quite regularly in the mating season. In fact, two definite cases of inbreeding were detected. The likely benefits of delayed dispersal are discussed in view of the confirmed cases of inbreeding.read more
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Varying patterns of coexistence of two mouse lemur species (Microcebus ravelobensis and M. murinus) in a heterogeneous landscape.
TL;DR: The divergent pattern of local and regional coexistence of these two species is discussed and can be best explained either by the existence of a spatially heterogeneous competitive environment or by independent evolutionary pathways in different historic environments.
Journal ArticleDOI
Kin-directed food sharing promotes lifetime natal philopatry of both sexes in a population of fish-eating killer whales, Orcinus orca
TL;DR: It is proposed that lifetime philopatry of both sexes has been selectively favoured in this population due to the inclusive fitness benefits of kin-directed food sharing, a cooperative behaviour that may also inhibit dispersal by reducing resource competition among kin.
Journal ArticleDOI
Parentage-based pedigree reconstruction reveals female matrilineal clusters and male-biased dispersal in nongregarious Asian great apes, the Bornean orang-utans (Pongo pygmaeus).
Natasha Arora,M A van Noordwijk,Corinne Y. Ackermann,Erik P. Willems,Alexander Nater,Maja P. Greminger,Pirmin Nietlisbach,Lynda P. Dunkel,S S Utami Atmoko,Joko Pamungkas,Dyah Perwitasari-Farajallah,C P van Schaik,Michael Krützen +12 more
TL;DR: It is found that males had significantly higher mitochondrial DNA variation and more unique haplotypes, thus underscoring their different maternal ancestries compared to females, and pedigree reconstruction based on 24 highly polymorphic microsatellite markers and mtDNA haplotypes demonstrated the presence of three matrilineal clusters of generally highly related females with substantially overlapping ranges.
Journal ArticleDOI
Lemur species-specific metapopulation responses to habitat loss and fragmentation.
TL;DR: Investigation of metapopulation dynamics of a lemur community within fragmented tropical dry deciduous forest habitat in Ankarafantsika National Park, Madagascar suggests that area was a more consistent positive factor determining lemur species occurrence than fragment isolation and is crucial to the maintenance of lemur populations within this fragmented landscape.
Journal ArticleDOI
Leaf nest use and construction in the golden‐brown mouse lemur (Microcebus ravelobensis) in the Ankarafantsika National Park
TL;DR: It is confirmed that golden‐brown mouse lemurs build leaf nests themselves, which shows that this task is time consuming and therefore probably costly, and also indicates the role of nests in infant protection.
References
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The Detection of Disease Clustering and a Generalized Regression Approach
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Mating systems, philopatry and dispersal in birds and mammals
TL;DR: It is argued that the direction of the sex bias is a consequence of the type of mating system, and Philopatry will favour the evolution of cooperative traits between members of the sedentary sex.
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