Application of sexual dimorphism-derived variation in morphometrics and intraspecific interaction likelihood in Sunda pangolin (Manis javanica) to increase species encounter rates




Abstract. Novriyanti N, Takandjandji M. 2022. Application of sexual dimorphism-derived variation in morphometrics and intraspecific interaction likelihood in Sunda pangolin (Manis javanica) to increase species encounter rates. Biodiversitas 23: 2753-2759. Effectively encounters opportunities of Sunda pangolin (Manis javanica) in natural habitats is still necessary to have more research. A diversity of pangolins' physical and biological characteristics has been disclosed to facilitate the identification process in natural habitats. However, pangolins are animals that tend to be solitary; they have fast movement, so the area coverage is extensive; this condition complicates the data collection process. It is unknown yet, whether pangolins of different sexes usually exist in the same space and time, either in terms of foraging or other interactions, known as intra-specific interactions. Thus, this study aimed to predict intraspecific interactions of M. javanica to increase the encountering of pangolins chance in natural habitats. As many as 29 individual pangolins (14 males and 15 females) be measured its morphometric data. To convincingly justify that morphometric variation can be used as encounter rate opportunities in natural habitats, a series of analyses, i.e., univariate test, correlation analysis, and multiple regression, were applied to this research. Other estimations from feeding activity data were also carried out to detect pangolins' niche width and its overlap according to sexual dimorphism. Univariate analysis shows that overall, the total body length (head to tail) of both males and females does not differ significantly. But, the correlation coefficient indicates the physical character of female and male body length is related to each other (value 0.769**). The resulting regression model indicates that the presence of pangolins in their sex similarity in a particular place tends to be avoided, while there is a 1:1 probability of sexual dimorphism. This also means that males and females can be used as the same individual in ecological observations.


van Altena C, Hemerik L, Heesterbeek JAP, de Ruiter PC. 2016. Patterns in intraspecific interaction strengths and the stability of food webs. Theoretical Ecology 9 (1): 95–106. DOI: 10.1007/s12080-014-0244-6
Angwafo TSIE, Kaimo NK, Chuo MD. 2019. Abundance and distribution of pangolins ( Manis spp .) in the kimbi-fungom national park , North West Region , Cameroon. 7 (February 2017): 71–78.
Arellano G, Umaña MN, Macía MJ, Loza MI, Fuentes A, Cala V, Jørgensen PM. 2017. The role of niche overlap, environmental heterogeneity, landscape roughness and productivity in shaping species abundance distributions along the Amazon–Andes gradient. Global Ecology and Biogeography 26 (2): 191–202. DOI: 10.1111/geb.12531
Baumgardner GD, Kennedy ML. 1994. Patterns of interspecific morphometric variation in kangaroo rats (genus Dipodomys). Journal of Mammalogy 75 (1): 203–211. DOI: 10.2307/1382252
Bertassoni A, Mourão G, Ribeiro RC, Cesário CS, Oliveira JP d., Bianchi R de C. 2017. Movement patterns and space use of the first giant anteater (Myrmecophaga tridactyla) monitored in São Paulo State, Brazil. Studies on Neotropical Fauna and Environment Taylor & Francis 52 (1): 68–74. DOI: 10.1080/01650521.2016.1272167
Bertassoni A, Ribeiro MC. 2019. Space use by the giant anteater (Myrmecophaga tridactyla): a review and key directions for future research. European Journal of Wildlife Research European Journal of Wildlife Research 65 (6) DOI: 10.1007/s10344-019-1334-y
Challender D. 2008. Asian Pangolins?: How Behavioural Research can Contribute to their Conservation. in: Proceedings of the Workshop on Trade and Conservation of Pangolins Native to South and Southeast Asia 95–102
Challender D, Wilcox DH., Panjang E, Lim N, Nash H, Heinrich S, Chong J. 2019a. Manis javanica. The IUCN Red List of Threatened Species 2019: e.T12763A123584856
Challender D, Wu S, Kaspal P, Khatiwada A, Ghose A, Ching-Min Sun, N., Mohapatra RK, Laxmi Suwal T. 2019b. Manis pentadactyla (errata version published in 2020). The IUCN Red List of Threatened Species 2019: e.T12764A168392151 8235
Challender DWS, Thai N Van, Jones M, May L. 2012. Time-budgets and activity patterns of captive Sunda pangolins (Manis javanica). Zoo Biology DOI: 10.1002/zoo.20381
Chong JL, Panjang E, Willcox D, Nash HC, Semiadi G, Sodsai W, Lim NT-L, Fletcher L, Kurniawan A, Cheema S. 2020. Sunda pangolin Manis javanica (Desmarest, 1822). Pangolins INC DOI: 10.1016/b978-0-12-815507-3.00006-x
Classen A, Steffan-Dewenter I, Kindeketa WJ, Peters MK. 2017. Integrating intraspecific variation in community ecology unifies theories on body size shifts along climatic gradients. Functional Ecology 31 (3): 768–777. DOI: 10.1111/1365-2435.12786
Elfidasari D. 2007. Type of intraspecific and interspecific interaction among three heron species, while foraging around Pulau Dua Nature Reserve, Serang, Banten’s province. Biodiversitas, Journal of Biological Diversity 8 (4): 266–269. DOI: 10.13057/biodiv/d080404
Gaubert P, Antunes A, Meng H, Miao L, Peigné S, Justy F, Njiokou F, Dufour S, Danquah E, Alahakoon J, Verheyen E, Stanley WT, O’Brien SJ, Johnson WE, Luo SJ. 2018. The Complete Phylogeny of Pangolins: Scaling Up Resources for the Molecular Tracing of the Most Trafficked Mammals on Earth. Journal of Heredity DOI: 10.1093/jhered/esx097
Kuswanda W, Onrizal O. 2018. Strategi penangkaran Trenggiling (Manis javanica) di Sumatera Utara. Talenta Conference Series: Agricultural and Natural Resources (ANR) 1 (2): 227–230. DOI: 10.32734/anr.v1i2.241
Lim NTL, Ng PKL. 2008. Home range, activity cycle and natal den usage of a female Sunda pangolin Manis javanica (Mammalia: Pholidota) in Singapore. Endangered Species Research 4 : 233–240. DOI: 10.3354/esr00032
Manshur AAPK dan BM. 2015. Karakteristik habitat Trenggiling Jawa (Manis javanica) di Taman Nasional Gunung Halimun Salak. Media Konservasi 20 (1): 77–83.
Masy’ud B, Novriyanti N, Bismark M. 2011. Perilaku Trenggiling (Manis javanica, Desmarest 1822) dan Kemungkinan Penangkarannya. Media Konservasi 16 (3): 141–148.
Maurice ME. 2019. The ecological impact on the distribution of Pangolins in Deng-Deng National Park, Eastern Region, Cameroon. Global Journal of Ecology (March): 008–014. DOI: 10.17352/gje.000009
Nijman V, Shepherd CR, Mumpuni, Sanders KL. 2012. Over-exploitation and illegal trade of reptiles in Indonesia. Herpetological Journal 22 (2): 83–89.
Novriyanti N. 2011. Kajian Manajemen Penangkaran, Tingkat Konsumsi, Palatabilitas Pakan, dan Aktivitas Harian Trenggiling (Manis javanica Desmarest 1822) di Penangkaran UD Multi Jaya Abadi Sumatera Utara. Institut Pertanian Bogor
Ofstad EG, Herfindal I, Solberg EJ, Sæther BE. 2016. Home ranges, habitat and body mass: simple correlates of home range size in ungulates. Proceedings. Biological Sciences 283 (1845) DOI: 10.1098/rspb.2016.1234
Omifolaji JK, Ikyaagba ET, Jimoh SO, Ibrahim AS, Ahmad S, Luan X. 2020. The emergence of Nigeria as a staging ground in the illegal pangolin exportation to South East Asia. Forensic Science International: Reports Elsevier B.V. 2 (August): 100138. DOI: 10.1016/j.fsir.2020.100138
Priatna D, Santosa Y, Prasetyo LB, Kartono a P. 2012. Home Range and Movements of Male Translocated Problem Tigers in Sumatra. Asian Journal of Conservation Biology 1 (1): 20–30.
Rianti A, Novriyanti N, Takandjandji M. 2017. Trials of Feeding Composition Combinations for Pangolin (Manis javanica Desmarest, 1822) in the Captive Breeding. Jurnal Penelitian Hutan dan Konservasi Alam 14 (2): 111–122. DOI: 10.20886/jphka.2017.14.2.111-122
Santini L, Di Marcc M, Visconti P, Baiserc D, Boitanl L, Rondinini C. 2013. Ecological correlates of dispersal distance in terrestrial mammals. Hystrix 24 (2) DOI: 10.4404/hystrix-24.2-8746
Semiadi G, Dedy D, Arief AJ. 2008. Sunda Pangolin Manis javanica Conservation in Indonesia: Status & Problems. in: Proceedings of the Workshop on Trade and Conservation of Pangolins Native to South and Southeast Asia Sunda 12–17
Shine R. 1986. Sexual differences in morphology and niche utilization in an aquatic snake, Acrochordus arafurae. Oecologia 69 : 260–267.
Sompud J, Lu S, Pamin D, Sompud CB, Mojiol AR. 2016. Nocturnal Terrestrial Mammals Population in Sabah Forest Industries (SFI) Forest Plantation, Sipitang. Transactions on Science and Technology 3 (1–2): 123–129.
Sompud J, Sompud CB, Pei KJ, Sun NC, Repin R, Tuh F. 2019. Sunda Pangolin Manis javanica (Mammalia: Pholidota: Manidae) of Gaya Island, Sabah. Journal of Threatened Taxa 11 (5): 13552–13556. DOI: 10.11609/jott.4198.11.5.13552
Sulaiman MH, Azmi WA, Hassan M, Chong JL. 2017. Current updates on the morphological measurements of the Malayan pangolin (Manis javanica). Folia Zoologica 66 (4): 262–266. DOI: 10.25225/fozo.v66.i4.a8.2017
Suzuki A, Thong S, Tan S, Iwata A. 2017. Camera trapping of large mammals in Chhep Wildlife Sanctuary, northern Cambodia. Phnom Penh Cambodian Journal of Natural History Cambodian Journal of Natural History Cambodian Journal of Natural History 2017 (11): 63–75.
Takandjandji M, Sawitri R. 2016. Ukuran Morfometrik dan Meristik pada Trenggiling Jawa (Manis javanica Desmarest, 1822) dari Pulau Sumatera, Jawa, dan Kalimantan. Buletin Plasma Nutfah 22 (2): 149–160. DOI: 10.21082/blpn.v22n2.2016.p149-160
Trageser SJ, Ghose A, Faisal M, Mro P, Mro P, Rahman SC. 2017. Pangolin distribution and conservation status in Bangladesh. PLoS ONE 12 (4) DOI: 10.1371/journal.pone.0175450
Willcox D, Nash HC, Trageser S, Kim HJ, Hywood L, Connelly E, Ichu Ichu G, Kambale Nyumu J, Mousset Moumbolou CL, Ingram DJ, Challender DWS. 2019. Evaluating methods for detecting and monitoring pangolin (Pholidata: Manidae) populations. Global Ecology and Conservation The Authors 17: e00539. DOI: 10.1016/j.gecco.2019.e00539