Isabelle Lackman-Ancrenaz
EcologyPopulationPongo pygmaeusBiologyZoology
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Publications 14
#1Michael William Bruford (Cardiff University)H-Index: 66
#2Marc AncrenazH-Index: 33
Last. Benoit GoossensH-Index: 37
view all 7 authors...
Genetic management of fragmented populations poses logistical and theoretical challenges to conservation managers. Simulating changes in genetic diversity and differentiation within and among fragmented population units under different management scenarios has until now rarely used molecular marker data collected from present-day populations. Here we examine the genetic implications of management options for the highly fragmented yet globally significant orang-utan population in the Lower Kinaba...
71 CitationsSource
#1Benoit GoossensH-Index: 37
#2Lounès ChikhiH-Index: 35
Last. Michael William BrufordH-Index: 66
view all 6 authors...
This chapter reviews the published data and discusses the taxonomy and population genetics of orangutans. The orangutan was traditionally classified as two separate subspecies, Pongo pygmaeus pygmaeus in Borneo and P. p. abelii in Sumatra. Recent molecular data have suggested a re-classification into two separate species: P. pygmaeus in Borneo and P. abelii in Sumatra. Moreover, three subspecies have been described on Borneo Island: P. p. pygmaeus in Sarawak and west Kalimantan, P. p. morio in S...
12 Citations
#1Mohd Fairuz Jalil (Cardiff University)H-Index: 1
#2Joanne Cable (Cardiff University)H-Index: 35
Last. Benoit Goossens (Cardiff University)H-Index: 37
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We examined mitochondrial DNA control region sequences of 73 Kinabatangan orang-utans to test the hypothesis that the phylogeographical structure of the Bornean orang-utan is influenced by riverine barriers. The Lower Kinabatangan Wildlife Sanctuary contains one of the most northern populations of orang-utans (Pongo pygmaeus) on Borneo and is bisected by the Kinabatangan River, the longest river in Sabah. Orang-utan samples on either side of the river were strongly differentiated with a high ΦST...
90 CitationsSource
#1Benoit Goossens (Cardiff University)H-Index: 37
#2Joanna M. Setchell (University of Cambridge)H-Index: 35
Last. Michael William Bruford (Cardiff University)H-Index: 66
view all 9 authors...
Behavioural observations suggest that orang-utans are semi-solitary animals with females being philopatric and males roaming more widely in search of receptive partners, leading to the prediction that females are more closely related than males at any given site. In contrast, our study presents evidence for male and female philopatry in the orang-utan. We examined patterns of relatedness and parentage in a wild orang-utan population in Borneo using noninvasively collected DNA samples from animal...
97 CitationsSource
#1Benoit Goossens (UMS: Universiti Malaysia Sabah)H-Index: 37
#2Lounès Chikhi (Paul Sabatier University)H-Index: 35
Last. Michael William Bruford (Cardiff University)H-Index: 66
view all 6 authors...
Great ape populations are undergoing a dramatic decline, which is predicted to result in their extinction in the wild from entire regions in the near future. Recent findings have particularly focused on African apes, and have implicated multiple factors contributing to this decline, such as deforestation, hunting, and disease. Less well-publicised, but equally dramatic, has been the decline in orang-utans, whose distribution is limited to parts of Sumatra and Borneo. Using the largest-ever genet...
255 CitationsSource
#1Hamisah ElahanH-Index: 2
Last. Marc AncrenazH-Index: 33
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Wild orang,utans (Pongo pygmaeus morio) studied at the “Kinabatangan Orang-utan Conservation project�, Sabah, Malaysia, are mainly frugivorous. They are regularly observed to swallow large seeds (length longer than five mm) from 37 different plant genera and to spit large seeds from 27 plant genera. For three of these genera, we compared the time to first germination, the germination success, the 50%, germination time and seedling mortality of seeds that were spat out, swallowed or left unpr...
4 Citations
#1Benoit GoossensH-Index: 37
#2Lounès Chikhi (Paul Sabatier University)H-Index: 35
Last. Michael William Bruford (Cardiff University)H-Index: 66
view all 8 authors...
We investigated the genetic structure within and among Bornean orang-utans ( Pongo pygmaeus ) in forest fragments of the Lower Kinabatangan flood plain in Sabah, Malaysia. DNA was extracted from hair and faecal samples for 200 wild individuals collected during boat surveys on the Kinabatangan River. Fourteen microsatellite loci were used to characterize patterns of genetic diversity. We found that genetic diversity was high in the set of samples (mean H E = 0.74) and that genetic differentiation...
161 CitationsSource
#1Marc AncrenazH-Index: 33
#2Olivier Gimenez (CNRS: Centre national de la recherche scientifique)H-Index: 41
Last. Isabelle Lackman-AncrenazH-Index: 10
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Great apes are threatened with extinction, but precise information about the distribution and size of most populations is currently lacking. We conducted orangutan nest counts in the Malaysian state of Sabah (North Borneo), using a combination of ground and helicopter surveys, and provided a way to estimate the current distribution and size of the populations living throughout the entire state. We show that the number of nests detected during aerial surveys is directly related to the estimated t...
154 CitationsSource
#1Marc AncrenazH-Index: 33
#2Benoit Goossens (Cardiff University)H-Index: 37
Last. Isabelle Lackman-AncrenazH-Index: 10
view all 5 authors...
Because of the difficulties encountered in detecting many large tropical forest-dwelling species in their natural habitat, precise figures concerning the distribution, number and trends of many populations remain deficient. In tropical forests, ground surveys are generally carried out by counting objects along straight lines. These counts require a strict compliance with the line-transect methodology before (proper design of the census), during (careful data collection) and after (accurate and c...
113 CitationsSource
High concentrations of orangutans remain in the multiple-use forests of the Lower Kinabatangan, Sabah, Malaysia. Compared to primary forest, the habitat is highly fragmented, characterized by a low tree density (332 stems/ha), small tree size (83.6% of trees are <20 m high), low basal area (18 m2/ha), abundance of canopy gaps and high level of soil disturbance. The forest structure and composition influence orangutan nesting patterns, and thus directly influence the results of nest surveys used ...
73 CitationsSource