bs_bs_banner Zoological Journal of the Linnean Society, 2014, 170, 917–932. With 4 figures The distribution of the Malay civet Viverra tangalunga (Carnivora: Viverridae) across Southeast Asia: natural or human-mediated dispersal? GERALDINE VERON1*§, MARAIKE WILLSCH2, VICTOR DACOSTA1, MARIE-LILITH PATOU1†, ADRIAN SEYMOUR3‡, CELINE BONILLO4, ARNAUD COULOUX5, SIEW TE WONG6, ANDREW P. JENNINGS1, JÖRNS FICKEL2 and ANDREAS WILTING2*§ 1 Unité Origine, Structure et Evolution de la Biodiversité, UMR CNRS MNHN 7205, Département Systématique et Evolution, Muséum National d’Histoire Naturelle, CP 51, 57 rue Cuvier, 75231 Paris Cedex 05, France 2 Leibniz Institute for Zoo and Wildlife Research, Alfred-Kowalke-Str. 17, 10315 Berlin, Germany 3 Operation Wallacea, Old Bolingbroke, Lincolnshire PE23 4EX, UK 4 Service de Systématique Moléculaire, UMS 2700, Département Systématique et Evolution, Muséum National d’Histoire Naturelle, CP 26, 57 rue Cuvier, 75231 Paris Cedex 05, France 5 Genoscope, Centre National de Séquençage, 2 rue Gaston Crémieux, CP5706, 91057 Evry Cedex, France 6 Bornean Sun Bear Conservation Center, PPM 219, Elopura, 90000 Sandakan, Sabah, Malaysia Received 20 June 2013; revised 24 October 2013; accepted for publication 30 October 2013 The Malay civet Viverra tangalunga Gray, 1832 is a fairly large viverrid that has a wide distribution in both the Sundaic and Wallacea regions of Southeast Asia. We investigated the genetic diversity of V. tangalunga by analysing the mitochondrial DNA of 81 individuals throughout its range in order to elucidate the evolutionary history of this species and to test the hypotheses of natural dispersal and/or potential human introductions to some islands and regions. Our phylogenetic analyses revealed that V. tangalunga has a low matrilinear genetic diversity and is poorly structured geographically. Borneo is likely to have served as the ancestral population source from which animals dispersed during the Pleistocene. Viverra tangalunga could have naturally dispersed to Peninsular Malaysia, Sumatra, and Belitung, and also to several other Sunda Islands (Bangka, Lingga, and Bintang in the Rhio Archipelago), and to Palawan, although there is possible evidence that humans introduced V. tangalunga to the latter islands. Our results strongly suggested that V. tangalunga was transported by humans across Wallace’s Line to Sulawesi and the Moluccas, but also to the Philippines and the Natuna Islands. Our study has shown that human-mediated dispersal can be an important factor in understanding the distribution of some species in this region. © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014, 170, 917–932. doi: 10.1111/zoj.12110 ADDITIONAL KEYWORDS: biogeography – Carnivora – human introduction – phylogeography – Southeast Asia – Sunda Shelf. *Corresponding author. E-mail: [email protected]; [email protected] †Current address: Biotope, Recherche & Développement, 22 Boulevard Maréchal Foch, 34140 Mèze, France. ‡Current address: University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol, BS16 1QY, UK. §Contributed equally. © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014, 170, 917–932 917 918 G. VERON ET AL. INTRODUCTION Southeast Asia had a complex and dynamic environmental history during the Plio-Pleistocene (from c. 5.3 Mya to 11 700 years ago; Voris, 2000; Hall, 2002). Within the Sundaic region, climate-induced sea level changes altered the topography repeatedly, exposing and flooding land corridors between Peninsular Malaysia, Borneo, Sumatra, Java, and smaller islands. Faunal distribution patterns across the Sunda Shelf have typically been ascribed to Pleistocene movements across exposed land connections (Wallace, 1869; Heaney, 1986; Brandon-Jones, 1996, 2001). However, several recent molecular studies have challenged the traditional hypothesis that there were unrestricted movements across the Sunda Shelf during periods of lower sea levels (Gorog, Sinaga & Engstrom, 2004; Patou et al., 2010; Wilting et al., 2011). An often neglected factor that might have influenced the current distribution of species in Southeast Asia is the human transportation of animals (De Vos, Manville & Van Gelder, 1956; Heinsohn, 2001, 2002, 2003; Matisoo-Smith & Robins, 2004; Larson et al., 2007; Corlett, 2010). In particular, the presence of some Sundaic species within the Wallacea region, such as the common palm civet Paradoxurus hermaphroditus (Pallas, 1777) and the Malay civet Viverra tangalunga Gray, 1832, has been attributed to human introductions across Wallace’s Line, a deepsea channel separating these two regions (Voris, 2000; Heinsohn, 2001; van den Bergh et al., 2009). Although civets are eaten all over Southeast Asia (G.V., pers. observ.; Corlett, 2007; Shepherd & Shepherd, 2010), there is currently no historical evidence that civets were transported as a food item to the Wallacea region. Civets are also kept as pets (Shepherd, 2008) and used as rat-catchers (although their diet mainly comprises fruit and invertebrates; Jennings & Veron, 2009), which are both plausible reasons why humans might have translocated civets; however, hypotheses of natural or human-mediated dispersals across Southeast Asia have rarely been challenged for mammals within this region, and have never been tested for V. tangalunga. Viverra tangalunga is a fairly large (3–7 kg) terrestrial species that occurs mainly in primary and secondary lowland forests (Jennings & Veron, 2009, 2011). It is the sister species to the other Viverra civets (occurring on mainland Southeast Asia) from which it diverged c. 4.6 Mya (Gaubert & Cordeiro-Estrela, 2006). This species is found on Peninsular Malaysia (including Langkawi Island), Singapore, Sumatra, Borneo, the Philippines, Sulawesi, the Moluccas, and several small Indonesian islands (Jennings & Veron, 2011). The wide distribution of V. tangalunga, both within the Sundaic and Wallacea regions, makes this species a good model to investigate to what extent natural dispersal during the last glacial period (c. 110 000–10 000 years ago) and/or human-mediated translocation shaped the current distribution of a species within Southeast Asia. It is generally considered that V. tangalunga dispersed naturally across the emerged Sunda Shelf during the Pleistocene, but was introduced by humans to areas east of Wallace’s Line (Sulawesi and the Moluccas; Weber, 1899; De Vos et al., 1956; Groves, 1976, 1984; Feiler, 1990; Boitani, 2001; Heinsohn, 2001; van den Bergh et al., 2009). There is no historical documentation of introductions of V. tangalunga, although museum specimens have been collected within the Wallacea region since the middle of the 19th century. Some civet species are farmed for ‘civet oil’ from their perineal glands, which is used in traditional medicine and in the perfume industry (Jennings & Veron, 2009). This has been suggested as a reason for the translocation of V. tangalunga to the Wallacea region (Groves, 1984; Heinsohn, 2001; Helgen, 2002), but evidence is lacking that V. tangalunga has ever been farmed for this purpose. The hypothesis of human-mediated dispersal of V. tangalunga is supported by the absence of fossils in the Moluccas (Flannery et al., 1995) and Sulawesi (Hooijer, 1950), whereas remains from the Niah Caves on Borneo proved its Pleistocenic and Holocenic presence on this island (Cranbrook & Piper, 2007; Cranbrook, 2010). For the Philippines, human introduction has been proposed for P. hermaphroditus (Patou et al., 2010; Piper et al., 2011), but so far not for V. tangalunga, even though no Pleistocene or Holocene remains of this latter species have been found in this region (Piper et al., 2011). The aim of our study was to investigate the genetic diversity and the evolutionary history of V. tangalunga in order to test the traditional hypothesis that its occurrence across the Sunda Shelf stemmed from Pleistocene natural dispersal, whereas the presence of this species beyond Wallace’s Line resulted from human-mediated introductions. MATERIAL AND METHODS MOLECULAR SAMPLING, DNA EXTRACTION, AND SEQUENCING We collected 86 samples (33 hairs or tissues; 53 from museum specimens) of V. tangalunga. Sample selection was aimed at covering all major regions and islands across the distribution of the species (Appendix S1; Fig. 1; Table 1). DNA of fresh samples was extracted following a cetyl-trimethyl-ammonium bromide (CTAB)-based protocol (Winnepenninckx, © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 EVOLUTIONARY HISTORY OF THE MALAY CIVET 919 Figure 1. The location of Viverra tangalunga samples used in this study. The grey shading indicates the currently known distribution of V. tangalunga (see Jennings & Veron, 2011). The size of each dot represents the number of samples per locality. Backeljau & De Wachter, 1993) at the Muséum national d’Histoire naturelle (Paris, France). DNA extractions from museum samples were conducted at the Leibniz Institute for Zoo and Wildlife Research (Berlin, Germany) following a modified protocol of Wisely, Maldonado & Fleischer (2004), as described in Wilting et al. (2011). We sequenced two mitochondrial loci: 228 bp (in the 5′ region) of cytochrome b (cyt b) using previously described primers (Gaubert et al., 2004; Veron et al., 2004) and 569 bp of the control region (CR), using primers CR1F (5′-CCACTATCAGCACCCAAAGC-3′) and CR2R (5′-CCCGGAGCGAGAAGAGG-3′) from Palomares et al. (2002). To accommodate the fragmented DNA in museum samples, we designed additional nested primers for cyt b and CR: Cytb2F (5′-TCATCAGTTACCCACATTTGC-3′) and Cytb2R (5′-GGACATTTGGCCTCATGGTA-3′); CR0F (5′-TTC CCTGCAATACCAAAAACT-3′) and CR0R (5′-ATGGG GACAAGCGGTTAAT-3′); CR3F (5′-TTAATCGCTAGT CCCCATGAAT-3′) and CR2R; CR4F (5′-CCTCTTCTC GCTCCGGG-3′) and CR3R (5′-TACCAAATGCATGA CATCACAG-3′). Polymerase chain reactions (PCRs) were performed in 20-μL reaction volumes with the following constituents: 50–100 ng of genomic DNA, 2 μL of 10× Taq polymerase buffer, 2.5 mM of MgCl2, 0.2 mM of dNTP mix, 0.32 μM of each primer, and 0.5–1 unit of TaqPolymerase (QBiogene, Illkirch, France) or GoTaq polymerase (Promega GmbH, Mannheim Germany). PCR cycles for DNA amplification were: 94 °C for 4 min, followed by 35–45 cycles of 94 °C for 30 s (denaturation), 50 °C (cyt b) or 61 °C (CR) for 30–45 s (annealing), and 72 °C for 40 s (extension), with a final extension step at 72 °C for 7 min. Fragments that had amplified successfully were purified by ExoSap (GENOSCOPE, Evry, France) or ExoFastAP (Fermentas GmbH, St. Leon-Rot, Germany) and then sequenced bidirectionally using BigDye® Terminator v.3.1 on an automated DNA sequencer A3100xl (Applied Biosystems). PCR fragments obtained from the DNA extracted from museum samples were amplified and sequenced twice to ensure the quality and authenticity of sequences. Sequences obtained independently in the two laboratories were congruent. PHYLOGENETIC AND HAPLOTYPIC NETWORK ANALYSES Sequences were assembled, aligned, and edited using CLUSTAL X2 (Larkin et al., 2007). Sequences from both loci were analysed separately and then © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 FMNH 145742 FMNH 146957 FMNH LRH4121 C201 C202 C203 TC430 TC431 TC432 TC433 TC434 TC435 TC442 TC448 TC449 TC450 TC452 TC454 TC474 TC494 TC522 TC523 TC524 TC525 TC529 TC533 TC534 TC556 TC571 TC575 TC576 TC577 TC578 TC593 TC594 TC682 IZW1 IZW7 IZW10 IZW11 IZW12 IZW13 IZW21 IZW22 IZW25 IZW26 IZW27 IZW28 ZS 1908/2748 RMNH 12441 RMNH 34838 RMNH 33980 RMNH 34826 RMNH 2412 RMNH 20729 RMNH 20730 RMNH 34831 RMNH 34832 RMNH 34833 RMNH 34827 Specimen Sample Sibuyan Island, Romblon Province Sibuyan Island, Romblon Province Mount Isarog, Luzon Island Lubuk Baung, Krau WR, Pahang Lubuk Baung, Krau WR, Pahang Jenderak, Krau WR, Pahang Jenderak, Krau WR, Pahang Jenderak, Krau WR, Pahang Jenderak, Krau WR, Pahang Jenderak, Krau WR, Pahang Buton Island, Sulawesi Buton Island, Sulawesi Buton Island, Sulawesi Buton Island, Sulawesi Buton Island, Sulawesi Jenderak, Krau WR, Pahang Jenderak, Krau WR, Pahang Sabah, Borneo Sabah, Borneo Sabah, Borneo Sabah, Borneo Sabah, Borneo Sabah, Borneo Sabah, Borneo Jenderak, Krau WR, Pahang Sabah, Borneo Danum Valley, Sabah, Borneo Danum Valley, Sabah, Borneo Sabah, Borneo Sabah, Borneo Sabah, Borneo Mengans Camp, Danum Valley, Sabah, Borneo Unknown (likely Palawan) Buru Island, Moluccas Sibau River, Poelau, Kalimantan, Borneo Pleihari, Kalimantan, Borneo Banka Island Banka Island Sulawesi Hitoe, Ambon Island, Moluccas Ambon Island, Moluccas Ambon Island, Moluccas Ambon Island, Moluccas Ambon Island, Moluccas Halmaheira Island, Moluccas Geographic origin Philippines Philippines Philippines Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Indonesia Indonesia Indonesia Indonesia Indonesia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Unkown Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Country Field Museum of Natural History, Chicago Field Museum of Natural History, Chicago Field Museum of Natural History, Chicago Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Field Zoologische Staatssammlung, München Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Naturalis, Leiden Source 1992 1992 1988–1994 2004 2004 2004 2004 2004 2004 2004 2003 2003 2003 2003 2003 2005 2005 2005 2005 2005 2005 2005 2005 2005 2006 2006 2006 2006 2006 2006 2006 2006 2011 1908 1894 1866 1935 1872 1935 1923 1922 1863 1863 1867 1863 Year of collection Table 1. List of the samples included in this study. For each sample, we report the sample identification number, the museum specimen identification number, the locality, country, source of the sample, and the year of collection 920 G. VERON ET AL. © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 AMNH 207581 AMNH 207582 AMNH 152881 AMNH 152882 AMNH 152883 AMNH 29734 AMNH 29735 AMNH 152878 AMNH 152879 AMNH 152880 AMNH 101395 AMNH 226805 19293 19294 19299 19302 19337 P158 SM 89 SM1297 (M 1216) SM 1298 (M 762) ZRC 4.1446 ZRC 4.1448 1025604 BZM 1089 BZM 70042 BZM 83476 BZM 83473 BZM 83460 IZW42 IZW43 IZW44 IZW45 IZW46 IZW49 IZW50 IZW51 IZW52 IZW53 IZW54 IZW55 IZW56 IZW57 IZW58 IZW59 IZW60 IZW61 IZW62 IZW63 IZW64 IZW66 IZW68 IZW71 IZW72 IZW74 IZW75 IZW78 IZW80 Halmaheira Island, Moluccas Halmaheira Island, Moluccas Tanjung Batu, Belitung Island Bukit Menguru, Belitung Island Lingga Island, Lingga Archipelago Bintang Island, Rhio Archipelago (= Riau Archipelago) Bintang Island, Rhio Archipelago (= Riau Archipelago) Bintang Island, Rhio Archipelago (= Riau Archipelago) Bunguran Island, Natuna Islands Bunguran Island, Natuna Islands Bunguran Island, Natuna Islands San Mariano, Sitio, Sierra Madre Mountains, Isabela Province, Luzon Island Curry, Pili, Mount Isaroq, Camarines Sur, Luzon Island Curry, Pili, Mount Isaroq, Camarines Sur, Luzon Island Bumbulan, Sulawesi Bumbulan, Sulawesi Bumbulan, Sulawesi Iwahig, San Antonio Bay, Palawan Iwahig, San Antonio Bay, Palawan Bumbulan, Sulawesi Bumbulan, Sulawesi Bumbulan, Sulawesi Lampobattang, Lombasang, Sulawesi Gunung Nokilalaki, Sulawesi Danum, Sabah, Borneo km 40 logging road Danum, Sabah, Borneo km 61, Danum road, Sabah, Borneo camp 85, Danum, Sabah, Borneo Danum Road, Sabah, Borneo Substation Marotai, Tawau Hills Park, Borneo Tawai Plateau, Telupid, Tall forest, Sabah, Borneo Kg. Pandasan, Kota Belud, Sabah, Borneo Mawao, Membakut, Way to Beaufort, Sabah, Borneo Larut, Perak Sumatra Sulawesi Sumatra Mindoro Island Luzon Island Sintang or Lintang, Kalimantan, Borneo La Datu, Sabah, Borneo Philippines Philippines Indonesia Indonesia Indonesia Philippines Philippines Indonesia Indonesia Indonesia Indonesia Indonesia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Malaysia Indonesia Indonesia Indonesia Philippines Philippines Indonesia Malaysia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Indonesia Philippines American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York American Museum of Natural History, New York Sabah Parks Sabah Parks Sabah Parks Sabah Parks Sabah Parks Sabah Parks Museum Sabah, Kota Kinabalu Museum Sabah, Kota Kinabalu Museum Sabah, Kota Kinabalu Raffles Museum of Biodiversity Research, Singapore Raffles Museum of Biodiversity Research, Singapore Naturhistorisches Museum Bern Museum fur Naturkunde, Berlin Museum fur Naturkunde, Berlin Museum fur Naturkunde, Berlin Museum fur Naturkunde, Berlin Museum fur Naturkunde, Berlin Naturalis, Leiden Naturalis, Leiden National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington National Museum of Natural History, Washington American Museum of Natural History, New York 1961 1961 1939 1939 1939 1901 1901 1939 1939 1939 1931 1975 1999 1999 2000 2000 2001 2000 1990 1971 1971 ND 1931 1892 1905 ND ND ND 1907 1863 1863 1904 1904 1901 1902 1902 1902 1900 1900 1900 1961 Samples from museum specimens (IZWxx) were processed at the Leibniz Institute for Zoo and Wildlife Research, Berlin. Tissue and hair samples (Cxx and TCxx) were processed at the Muséum national d’Histoire naturelle, Paris. RMNH 34828 RMNH 34829 USNM 124945 USNM 125024 USNM 113067 USNM 115597 USNM 115598 USNM 115599 USNM 104866 USNM 104867 USNM 104869 AMNH 187198 IZW29 IZW30 IZW31 IZW32 IZW33 IZW34 IZW35 IZW36 IZW37 IZW38 IZW39 IZW40 EVOLUTIONARY HISTORY OF THE MALAY CIVET 921 922 G. VERON ET AL. concatenated, as each separate analysis showed similar topologies. To select the nucleotide substitution model that best fitted the data, we used the hierarchical likelihood ratio test approach implemented in JMODELTEST 0.1.1 (Posada, 2008). The selected model was the Tamura-Nei model (TN93; Tamura & Nei, 1993), with an allowance for both invariant sites (+ I) and a gamma (+ G) distribution shape parameter α for among-site rate variation. Parameter values for the model selected were: –ln L = 1501.61, I = 0.846, and α = 0.674. Phylogenetic reconstructions based on these parameters were subsequently performed, applying the maximum-likelihood (ML) approach and the neighbour-joining (NJ) method, both implemented in MEGA 5.05 (Tamura et al., 2011), as well as the Bayesian inference (BI), implemented in MrBayes 3.2.1 (Huelsenbeck & Ronquist, 2001; for settings, see Wilting et al., 2011). As we had neither a proper out-group criterion nor a molecular clock (Felsenstein, 2004), we constructed unrooted phylogenetic trees. Tree- and star-like phylogenetic proportions were estimated using likelihood mapping analysis (Strimmer & von Haeseler, 1997), implemented in TREE-PUZZLE 5.2 (Schmidt et al., 2002). Support for proportions was assessed by a reliability percentage after 10 000 quartet puzzling steps. Stable (and potentially old) populations had tree-like phylogeny proportions of well above 50% (Strimmer & von Haeseler, 1997). In addition, to display all possible maximum parsimonious relationships among haplotypes, a haplotype median-joining (MJ) network was constructed using NETWORK 4.6.1 (Bandelt, Forster & Röhl, 1999). We computed the genetic diversity for five different island populations (Peninsular Malaysia, Borneo, Philippines, Sulawesi, and Moluccas) using ARLEQUIN 3.5 (Excoffier, Laval & Schneider, 2005). Samples from small islands and from Sumatra were grouped, as sample sizes from these localities were small. Belitung samples were excluded, owing to their very distinct haplotypes. Because we used a concatenated data set with potentially differing selective pressures acting on the two mitochondrial loci (Lopez et al., 1997), we applied Tajima’s D-test (Tajima, 1989) implemented in ARLEQUIN to investigate whether the concatenated data set could be treated as a selectively neutrally evolving unit or not. The demographic histories of the different island populations were inferred by mismatch distribution (Li, 1977; Rogers & Harpending, 1992) and from the Fu’s FS statistics (Fu, 1997), all implemented in ARLEQUIN. We used tau (τ), representing units of mutational time, together with a mutation rate μ = 2.2 × 10–9 per site and year (Kumar & Subramanian, 2002) in the equation μ = τ/2t × number of sites (= fragment length in bp) in order to estimate the age of V. tangalunga matrilines. RESULTS Sequences of CR + cyt b were obtained for 81 individuals; only CR sequences could be obtained for the remaining five samples (results in Appendix S2). The CR + cyt b Tajima’s D-test indicated that the concatenated data set used in our study could be treated as a neutrally evolving unit. The 81 samples analysed for both loci shared 39 mtDNA haplotypes (HTs; Appendix S3, with GenBank accession numbers KF177803–KF177880). The mtDNA nucleotide diversity (π) among all V. tangalunga was very low (π = 0.006361; Table 2). The highest number of HTs (16) was found on Borneo, and only two of these were shared with individuals on other islands. Borneo also had the highest nucleotide diversity of all island populations (π = 0.005621; Table 2). The phylogenetic analysis of mtDNA HTs, using NJ, ML, and BI approaches, generated weakly resolved phylogenetic trees (Fig. 2). Likelihood mapping (Schmidt et al., 2002) estimated an overall star-like phylogenetic proportion of 45.2%, resulting in a tree-like phylogeny proportion of 54.8%, indicating that V. tangalunga matrilines had not yet reached phylogenetic stability (Strimmer & von Haeseler, 1997; Fickel et al., 2008). None of the major island populations formed a monophyletic HT group, and only the Belitung samples were clearly distinct from all other V. tangalunga samples. Haplotypes from the Moluccas, as well as those from the Philippines, formed two distinct groups each. Generally, the genetic diversity of the samples was poorly structured geographically, and Bornean individuals were represented in all major clades. The centre of the main star-like network (Fig. 3) consisted of seven HTs, which represented samples from Borneo, Sulawesi, and the Natuna Islands. From this centre, branches radiated to HTs from other regions and islands (including the Moluccas, Sulawesi, the Philippines, other Borneo populations, and Peninsular Malaysia/Sumatra). The haplotype network supported the distinct position of V. tangalunga from Belitung. The Belitung HT27, shared by the two individuals representing this population, was separated by at least nine mutations from all other HTs. The HTs from Peninsular Malaysia were at least two, and up to five, mutational steps away from their closest relatives, HT28 (Borneo and the Rhio Archipelago), whereas the HT from Bangka and Lingga Islands was only one mutation step away from HT28. One of the two Sumatran samples was one mutation step from the Peninsular Malaysia HT group (and six steps away from Bornean and Riau Islands HTs), whereas the second Sumatran sample was one mutation step from two Bornean HTs. © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 Number of individuals N Fragment length/number of usable sites (nc) Diversity indices Number of haplotypes h Number of segregating sites S Transition/transversion ratio Nucleotide diversity p (SD) Haplotype diversity Hd (SD) Ratio R = h/N Tajima’s test of selective neutrality Tajima’s D P(Dsimulated < Dobserved) (1000 simulations) Mismatch distribution Average number of nucleotide differences k Variance of k τ Test of goodness-of-fit Sum of squared deviation (SSD) P(SSDsimulated ≥ SSDobserved) Harpending’s raggedness index P(Ragsimulated ≥ Ragobserved) Age of clade Based on τ (kyr) 95% CI (kyr) Sudden population expansion FS P(FS) Parameter 25 797 16 25 24/1 0.005621 (0.003192) 0.9567 (0.0231) 0.64 −1.1926 0.113 17 624 8083 2113 0.00141 0.92 0.00968 0.95 N/A N/A −6.555 0.003 39 41 37/4 0.006361 (0.003457) 0.9571 (0.0129) 0.481 −1.2375 0.092 5070 8315 6262 0.00464 0.59 0.01354 0.66 1786 891–2462 −24.665 < 0.0001 Borneo 81 797 All Table 2. Genetic diversity estimates within Viverra tangalunga © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 0.84067 0.689 N/A N/A 0.0774 0.26 0.158 0.29 7643 6299 3364 0.3978 0.693 5 9 8/1 0.004231 (0.002648) 0.7818 (0.0926) 0.455 11 797 Philippines −1.2724 0.182 N/A N/A 0.03425 0.32 0.1269 0.33 3165 2906 2489 −0.5172 0.322 6 8 7/1 0.003123 (0.002078) 0.8444 (0.1029) 0.6 10 797 Peninsular Malaysia −3.0597 0.001 N/A N/A 0.00122 0.75 0.12 0.84 0.681 1465 0.615 −1.77497 0.02 5 4 3/1 0.000772 (0.000731) 0.5385 (0.1611) 0.3846 13 797 Sulawesi 2.1475 0.843 N/A N/A 0.1172 0.07 0.16898 0.35 11 378 8510 4222 1.9718 0.986 4 8 7/1 0.005298 (0.00329) 0.8056 (0.0889) 0.444 9 797 Moluccas 1.366 0.772 N/A N/A 0.077 0.11 0.1365 0.19 7891 6488 4127 −0.3068 0.435 5 13 13/0 0.005179 (0.003148) 0.8364 (0.0702) 0.455 11 797 Natuna, Lingga, Rhio, Bangka, Sumatra N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 1 N/A N/A N/A N/A 0.5 2 797 Belitung EVOLUTIONARY HISTORY OF THE MALAY CIVET 923 924 G. VERON ET AL. Figure 2. Phylogenetic relationships among Viverra tangalunga inferred from mtDNA haplotypes from the concatenated 797-bp mitochondrial control region and cytochrome b sequences. Trees for each of the three analyses (neighbour joining, maximum likelihood, and Bayesian inference) had similar topologies. Numbers above the branches represent bootstrap support, with only values > 60% shown. Numbers in parentheses represent the number of individuals sharing the same haplotype; haplotype codes are listed in Appendix S3. The mismatch distribution analysis for V. tangalunga showed a unimodal distribution, indicating sudden population expansion (Fig. 4), which was supported by a strongly negative significant FS statistic (Table 2). The mismatch distributions for the different island populations largely confirmed the phylogenetic analyses. A unimodal pattern with a wide base was found for Borneo, and the populations from the © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 EVOLUTIONARY HISTORY OF THE MALAY CIVET 925 Figure 3. Haplotype network obtained from the analysis of the concatenated mitochondrial control region and cytochrome b sequences. Connecting lines represent single mutations, unless indicated otherwise under the lines. The size of the circles is proportional to the haplotype frequency, and the numbers indicate the haplotype names. Philippines, the Moluccas, and Peninsular Malaysia showed a bimodal to multimodal distribution, indicating a bi- to meta-population sample. Viverra tangalunga from Sulawesi had a unimodal mismatch distribution with a very small base, indicating a sudden population expansion. Based on the mismatch distribution, and using the equation t = τ/2μ, the approximate age of V. tangalunga was 1.79 Myr (95% CI: 0.89–2.46 Myr; Table 2). DISCUSSION The cyt b and CR diversity among V. tangalunga was very low compared with other Asian viverrids, such as the binturong Arctictis binturong (Raffles, 1821) (Cosson et al., 2007) or P. hermaphroditus (Patou et al., 2010). In contrast to other carnivores (Cosson et al., 2007; Tchaicka et al., 2007; Patou et al., 2010; Wilting et al., 2011), our data showed that V. tangalunga lacks a pronounced geographic structure, and that some island populations did not form monophyletic groups. BORNEO, THE ANCESTRAL POPULATION CENTRE OF VIVERRA TANGALUNGA The highest genetic diversity of V. tangalunga was found within the Bornean population. Bornean individuals were present in all major clades, and they shared haplotypes with most of the individuals from other parts of the species’ range. In addition, the wide base of the Borneo haplotypic mismatch distribution supported an ancient status of the Bornean population. These findings are congruent with the presence of Pleistocene V. tangalunga fossils from the Niah Caves on Borneo (Cranbrook & Piper, 2007; Cranbrook, 2010) and the lack of V. tangalunga fossils elsewhere (Hooijer, 1962; de Vos, 1983; Tougard, 2001; Louys, 2007), while fossil remains of other viverrids have been found throughout Southeast Asia (Hooijer, 1962; Flannery et al., 1995; Tougard, 2001; Louys, 2007; van den Bergh et al., 2009; A.M. Moigne pers. comm.). Thus, both genetic and fossil evidence point towards Borneo as the ancestral origin of the current populations of V. tangalunga. This indicates that during the Plio- and Pleistocene there was either a spatial restriction of V. tangalunga to Borneo, followed by a recent expansion to other parts of its range (congruent with the low intraspecific genetic variation within V. tangalunga), or that populations on other islands became extinct. The spatial restriction of V. tangalunga within the Sundaic region, during periods of lower sea levels, could have been ecologically driven, as this species depends on forested habitats (Jennings & Veron, 2011). During drier and cooler periods of the Pleistocene, humid tropical forest areas receded on the Sunda Shelf (Heaney, 1991; Wurster et al., 2010, but see Cannon, Morley & Bush, 2009), thereby restricting rainforest-dwelling species to forest refugia, and © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 926 G. VERON ET AL. Figure 4. Mismatch distribution computed for the concatenated mitochondrial sequences for all samples, and for the different populations (Peninsular Malaysia, Borneo, Philippines, Sulawesi, and Moluccas); solid line, observed distribution of pairwise differences; dashed line, expected distribution under the model of sudden demographic expansion. hindering their dispersal across exposed land bridges lacking rainforest. Climate and vegetation simulations (Cannon et al., 2009), as well as analyses of the carbon isotope composition of ancient cave guano profiles (Wurster et al., 2010), have suggested that during glacial periods, forests remained present in western Sumatra, central Borneo, and other parts of the emergent Sunda Shelf, and that some of these forested areas could have functioned as refugia for forest-dependent species (Lohman et al., 2011). Forest contractions during glaciations are likely to have had a more negative impact on V. tangalunga populations within the forest refugia on Sumatra and Peninsular Malaysia (than on Borneo), because of their smaller size during glacial periods (Slik et al., 2011). The size of forest fragments has been shown to impact the survival rates of species (Opdam, 1991). In addition, as rainforest refugia have largely been restricted to mountains (Lohman et al., 2011), the distribution range of lowland species, such as V. tangalunga, may have been more constricted during the last glacial maximum (LGM). Another explanation for a possible range restriction of V. tangalunga to Borneo during the last glacial period could have been the impact of the Toba supereruption in northern Sumatra in the Late Pleistocene, c. 73 500 years ago (Ambrose, 1998; Williams et al., 2009; Wilting et al., 2012), although the severity of its impact is debated (Louys, 2007). On Sumatra and Peninsular Malaysia, this eruption might have resulted in local population extinctions of V. tangalunga. The lack of ash layers on Borneo suggests that this island was less affected by the consequences of this super-eruption (Oppenheimer, 2002). DISPERSAL WITHIN THE SUNDAIC REGION The large genetic distance of Belitung V. tangalunga to all others suggests that V. tangalunga dispersed naturally from Borneo to Belitung during Pleistocene glacial periods, which was possible when the sea level was at least 40 m lower than at present and land bridges connected the islands (Voris, 2000). Despite a postulated savannah corridor through © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 EVOLUTIONARY HISTORY OF THE MALAY CIVET central Sundaland (Bird, Taylor & Hunt, 2005) that might have restricted the west–east dispersal of forest species, gallery forests along the main rivers that traversed the Sunda Shelf (Voris, 2000) could have served as travel corridors for forest species and facilitated the dispersal of V. tangalunga from Borneo to Belitung. Rising sea levels in the Late Pleistocene (∼10 000 years ago) may have isolated a small V. tangalunga population on Belitung (only one haplotype was found), which since then has diverged from their Bornean source. In fact, the distinctiveness of the Belitung V. tangalunga population indicates that it should be recognized as an evolutionarily significant unit (ESU; Moritz, 1994), and thus it should be managed separately from all other populations. Individuals from Peninsular Malaysia were also distinct from all other populations, albeit not as pronounced as the Belitung population. Despite a sandy seabed soil barrier, a possible savannah corridor through central Sundaland, and large rivers crisscrossing this region (which have all been proposed as limiting the dispersal of forest species between Borneo and Peninsular Malaysia; Heaney, 1991; Voris, 2000; Gathorne-Hardy et al., 2002; Meijaard, 2004; Bird et al., 2005; Wurster et al., 2010; Slik et al., 2011), V. tangalunga could have dispersed naturally from Borneo to Peninsular Malaysia in a similar way that it might have reached Belitung (i.e. along gallery forests). However, one specimen from the Raffles Museum of Natural History (ZRC 4.1446), labelled ‘Larut, Perak, Peninsular Malaysia’ (HT35), did not cluster with other Peninsular Malaysia individuals and was only one mutation step from a Bornean haplotype. This might suggest that V. tangalunga were also recently introduced by humans to Peninsular Malaysia from Borneo; however, the actual origin of this specimen could be in doubt (it was deposited initially in Perak Museum, in Larut district, and this might have been wrongly indicated as the collection locality). Viverra tangalunga from Bintang (Rhio Archipelago), Lingga, and Bangka Islands shared a common ancestor with civets from Peninsular Malaysia. Despite the early Holocene land connection between these islands and Peninsular Malaysia and Sumatra (Meijaard, 2003; Sathiamurthy & Voris, 2006; Corlett, 2009), our results suggest that these small islands were colonized from Borneo, possibly along the major rivers that crossed the Sundaland during the LGM (Meijaard, 2003). However, Viverra tangalunga from Bintang Island shared a haplotype with one Bornean individual (BZM 83473), which could also indicate a human introduction. The locality of BZM 83473 was recorded as ‘Lintang’ or ‘Sintang’ (supposedly from Borneo), but perhaps it was in fact from ‘Bintang’, which could explain why it had 927 a similar haplotype to the three individuals from Bintang Island. The two Sumatran individuals were very distinct from each other (18 mutations apart). The first individual clustered together with the Peninsular Malaysian HTs. Faunal affinities and genetic similarities between populations in Peninsular Malaysia and Sumatra have been documented for several groups of vertebrates (Gorog et al., 2004; Ziegler et al., 2007; Patou et al., 2009; Lohman et al., 2010), possibly as a result of the low depth of the sea channel between Peninsular Malaysia and Sumatra, which were connected at sea levels of only 20–30 m below the present level (Voris, 2000). The other Sumatran individual grouped together with V. tangalunga from Borneo (with only one mutation step from a Bornean HT), which could indicate a human introduction; however, this specimen (ZRC 4.1448) has no precise collection locality (it is only labelled ‘Sumatra’), and is indicated as having been purchased, so its exact origin is uncertain. Viverra tangalunga populations on Bunguran Island, part of the Natuna Islands, shared their HT with Bornean individuals (and most of the Sulawesi samples). This island was one of the first to be separated from the mainland and Borneo when sea levels started to rise c. 13 500 years ago (Meijaard, 2003; Sathiamurthy & Voris, 2006). Thus, this result suggests a recent human introduction from Borneo. Viverra tangalunga from the Philippines formed two separate haplogroups. One was separated by at least three mutation steps from Bornean HTs, whereas the second was separated by only one mutation step from a Bornean HT. This indicates that at least two colonization events occurred in the Philippines. Although a narrow sea channel between Borneo and Palawan is likely to have existed even during glacial periods, the fauna on Palawan has affinities with Borneo (Esselstyn et al., 2010; Piper et al., 2011), suggesting that V. tangalunga could have colonized Palawan naturally. Natural dispersal to the rest of the Philippines is less likely, however, because of the lack of land connections (Lohman et al., 2011). Thus, the presence of shared HTs on Palawan, Sibuyan, and Luzon indicates that some human introductions might have occurred in this region. CROSSING WALLACE’S LINE The Sulawesi samples showed no or little divergence from populations from Borneo (and Natuna Islands), providing evidence for human introductions to Sulawesi across Wallace’s Line, as the last possible connections between Borneo and Sulawesi were during the Pliocene or even the Miocene (Morales & Melnick, 1998; Mercer & Roth, 2003; Meijaard, 2004). © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014 928 G. VERON ET AL. This is congruent with previous hypotheses that V. tangalunga was introduced to Sulawesi in the Late Holocene or during the protohistoric period (Heinsohn, 2001; van den Bergh et al., 2009). The genetic diversity within Sulawesi V. tangalunga was very low and the extreme narrow base of the mismatch distribution strongly supports a recent population expansion. Although multiple introductions from Borneo to Sulawesi cannot be excluded, our data seemed to indicate a single introduction event, with a subsequent population expansion on Sulawesi. The nine samples from the Moluccas did not form a monophyletic group, but instead formed two distinct groups that were at least six mutations apart. Both groups were well supported by our analysis, suggesting two independent human introductions. One haplogroup (all from Ambon) was four steps away from a Bornean HT; the other haplogroup (Halmahera, Buru, and Ambon) was one step away from the central HT (Borneo, Sulawesi, and Natuna). Thus, the latter group probably originated from Borneo, but this might have been via Sulawesi. It is conceivable that the Ambon individual from the second group resulted from a secondary transfer of V. tangalunga from Halmahera/Buru. The distinctiveness of the Moluccan haplogroups suggests that V. tangalunga was introduced several thousand years ago to allow for the observed degree of diversification. Such early introductions were reported for several species from the Moluccas: Flannery et al. (1995) recovered remains of dogs and rats from a Late Holocene fossil site in Halmahera (with dogs dated to 2600–3400 years ago and rats dated to 1000 years ago), and suggested that pigs were already present before that time. Similar to V. tangalunga, the Pacific rat Rattus exulans (Peale, 1848) forms two distinct haplogroups in the Moluccas, likewise suggesting two human-mediated introductions (Matisoo-Smith & Robins, 2004). Rattus exulans was probably transported as a food item from the Philippines to the Wallacea region, and to Near and Remote Oceania (Matisoo-Smith & Robins, 2004). Although civets are eaten throughout Southeast Asia, it has never been suggested that V. tangalunga was transported as a food item during colonization events in the Wallacea region. Although the precise reason(s) for transporting V. tangalunga remains unresolved (e.g. as a rat-catcher, for civet oil, or for food), its introduction across Wallace’s Line might have followed the same routes as other introduced species (see a review in Heinsohn, 2003). CONCLUSION Our study has shown that in addition to possible natural dispersal scenarios, humans have translocated V. tangalunga across large parts of Southeast Asia, and that these translocations may have happened earlier than was previously thought. This is in line with the growing body of evidence that humans have carried species around with them since several thousand years ago (Heinsohn, 2003). For example, P. hermaphroditus was brought to Flores by humans c. 4000 years ago (van den Bergh et al., 2009). The human transportation of animals was not restricted to areas east of Wallace’s Line, but has also occurred within the Sundaic region. This has important implications for understanding the biogeography within Southeast Asia, as early introductions might blur the natural occurrence of species. Nevertheless, it is quite difficult to disentangle natural dispersal from early anthropogenic introductions, as humans started to translocate animals across Southeast Asian islands at the same time as when several small islands had just become isolated by rising sea levels. ACKNOWLEDGEMENTS G.V. thanks: D. Boussarie; C. Colon (Kingsborough Community College); D. Fernandez (Subic Bay Marine Exploratorium & Wildlife in Need); S. Goodman, J. Phelps, and L. Heaney (Field Museum of Natural History); C. Kern (Berlin Zoo); K. Wells (University of Ulm); and C. Young (Singapore Zoo). The molecular work performed by M.L.P., V.D., and G.V. was undertaken at the ‘Service de Systématique Moléculaire’ (UMS CNRS 2700, MNHN), and we thank M.C. Boisselier, E. Pasquet, and the staff of the SSM. The sequencing was supported by the ‘Consortium National de Recherche en Genomique’ (agreement no. 2005/67, GENOSCOPE-MNHN, ‘Macrophylogeny of Life’), directed by G. Lecointre. G.V. received funding from ‘PPF Etat et structure phylogénétique de la biodiversité actuelle et fossile’ (MNHN/French Ministry of Research), and from UMR 7205 CNRS/MNHN. G.V. and A.J. thank the EPU, PERHILITAN, and Z. Akbar (UKM) for supporting our fieldwork in Krau Wildlife Reserve, Malaysia; funding is acknowledged at http://www.smallcarnivores.org. A.W. and J.F. thank F. Mayer (Naturkundemuseum Berlin), K.M. Helgen (National Museum of Natural History), S. van der Mije (Naturalis), E. Westwig (American Museum of Natural History), P. Schmid (Natural History Museum Bern), R. 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List of regions and islands where Viverra tangalunga has been recorded, grouped by country and archipelago, with alternative spellings of names (from this study and Jennings & Veron, 2011; in bold, regions and islands for which we obtained samples). Appendix S2. Haplotype network obtained from analysis of the 86 control region sequences; connecting lines represent single mutations, unless indicated otherwise. Appendix S3. List of Haplotypes and their GenBank accession numbers. © 2014 The Linnean Society of London, Zoological Journal of the Linnean Society, 2014
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