Abstract # 13237 Event # 145:

Scheduled for Friday, August 10, 2018 02:15 PM-04:00 PM: (Chula Vista ) Oral Presentation


PHYLOGENETIC POSITION AND EVOLUTIONARY ORIGIN OF CAPPED-GOLDEN LANGUR LINEAGE

K. Arekar1,2, A. Parigi3 and P. Karanth1
1Indian Institute of Science, TE-11, Dr. Karanth Lab, CES, Biological Science Building, Bangalore, Karnataka 560012, USA, 2Wildlife Institute of India, 3Michigan State University
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     A robust phylogeny is important for resolving the systematics of taxonomically problematic groups. However, evolutionary processes like hybridisation, deep coalescence or gene duplication often generate conflicting phylogenies. A similar problem occurs in the colobine lineage of capped and golden langurs distributed in Northeast India and adjoining countries. There has been much ambiguity in the taxonomy of capped-golden (CG) langur lineage. Previous molecular studies invoked ancient hybridisation and incomplete lineage sorting of either nuclear or mitochondrial markers as possible reasons for the evolution of CG lineage due to incongruence in the mitochondrial and nuclear phylogenies. Nuclear phylogeny places CG lineage sister to Trachypithecus whereas the mitochondrial tree places it sister to Semnopithecus. However, another study rejected the hybridisation hypothesis as their mitochondrial phylogeny was similar to the nuclear phylogeny of previous studies. In our study, we used nine nuclear and eight mitochondrial markers. Our nuclear and mitochondrial phylogenies were in congruence, wherein the CG lineage was placed sister to Trachypithecus. However, we do not rule out hybridisation based on the species tree resulting from ASTRAL II and the unusual placement of CG numts in the phylogeny. Our hybridisation detection (HyDe) analysis did not give significant results as our dataset was not powered to detect significance owing to small sample size. These results will have important conservation implications specifically for the endangered and geographically restricted golden langur.