Fig. 1

Bayesian clustering results. (A) The 56 populations of Koompassia malaccensis from Malaysia were partitioned into two clusters: Cluster 1 and 2 (K = 2). Cluster 1 consists of 37 populations from West Malaysia (WM); Cluster 2 consists of East Malaysia (EM) populations and Peat Swamp (PS) populations. (B) Cluster 2 was further subdivided into: Cluster 2a (all EM populations except Maludam) and 2b (all PS populations) (K = 2). (C) Map of Malaysia showing the sampling locations and the population structure inferred from STRUCTURE analysis; PS populations are indicated in red font.