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Hippopotamus Sivalensis Spp.) DURING PLEISTOCENE in JAVA ISLAND

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Hippopotamus Sivalensis Spp.) DURING PLEISTOCENE in JAVA ISLAND Jurnal Biodjati 6(1):93-101, May 2021 e-ISSN : 2541-4208 p-ISSN : 2548-1606 http://journal.uinsgd.ac.id/index.php/biodjati HABITAT AND DISTRIBUTION MODELING OF PREHISTORIC HIPPOS (Hippopotamus sivalensis spp.) DURING PLEISTOCENE IN JAVA ISLAND Andriwibowo1*, Adi Basukriadi2, Erwin Nurdin3 Selected paper from the 5th Seminar Abstract. Currently, there are only two extant species of hippos includ- Nasional Biologi (SEMABIO), ing common (Hippopotamus amphibius) and pygmy hippos (Choeropsis Bandung-Indonesia, October 8, 2020 liberiensis). But in prehistoric times, there were several species. (conference.bio.uinsgd.ac.id) During Pleistocene these species were known to migrate to Java Received : November 20, 2020 Island from Asian Continent and the species was Hippopotamus Accepted : May 05, 2021 sivalensis spp. In this regard, this study aimed to model the habitat DOI: 10.15575/biodjati.v6i1.10250 of H. sivalensis spp., ecology, and biodiversity of Hippopotamus sivalensis spp. based on the fossil record. The model was developed 1,2,3Department of Biology, Faculty of Mathematics and Natural Sciences, based on the Principal Component Analysis (PCA) method using the R Universitas Indonesia, Pondok Cina, statistical package. The results showed that there were 7 populations Beji, Depok, West Java 16424, of H. sivalensis spp. that lived at various altitudes with an average Indonesia of 177 m above sea level (95% CI : 123-232 m). According to PCA, there were at least 2 separate populations of H. sivalensis spp. One e-mail: population occupies the forest while another occupies a habitat *[email protected] close to the coast. Currently the habitat for H. sivalensis spp. already 2 [email protected] changed. Based on habitat modeling, H. sivalensis spp. inhabit 3 [email protected] streams with submerged aquatic plants and shrubs and trees growing *Corresponding author along river banks. Keywords: Fossil, habitat, hippos, model, PCA, Pleistocene. Citation Andriwibowo, Basukriadi, A. & Nurdin, E. (2021). Habitat and Distribution Modeling of Pre- historic Hippos (Hippopotamus sivalensis spp.) During Pleistocene in Java Island. Jurnal Biodjati, 6(1), 93-101. INTRODUCTION plants. The history of the existence of mam- mals on Java Island began around 1.5 million Currently in the modern era or Anthro- years ago. The period of fauna existence it- pocene there are only 2 types of hippos. The self consists of several periods which include two types include the common hippopotamus Satir (1.5 million), Cisaat (1.2 million), Trinil (Hippopotamus amphibius) and the pygmy (1 million), Kedungbrubus (800 thousand), hippo (Choeropsis liberiensis) (Bogui et al., Ngandong (400 thousand), and Punung (100 2016). H. amphibious lives in East to South thousand years ago). It was during the Punung Africa while C. liberiensis lives solitary in period that modern mammals emerged, such as the rainforests of West Africa. Mammals elephants, tigers, rhinos, gibbons, orang-utans, including hippos have existed for several deer, and long-tailed monkeys (Cranbrook, million years ago. Mammals appeared 35 2010; Westaway, 2007). million years ago along with the existence of The migration of fauna is thought to Jurnal Biodjati 6(1):93-101, May 2021 http://journal.uinsgd.ac.id/index.php/biodjati have originated from Siwalik, Narbada, and spp. on the Java Island is required. Indonesia’s Burma via the Siva-Malayan route (De Vos, archipelago mainly Java Island is enriched 1983; Sondaar, 1984; Leinders et al., 1985; with present and past biodiversity as can be Sudijono, 1986). The migration of fauna is seen in faunal fossil deposits. In the present supported by the existence of a route connec- time, this research can contribute to fossil ting the Asian Continent and Java Island exploration. While for the future, it contri- along with the decline in sea level in the butes to the preservation and conservation of Sunda Strait at the beginning of the Pleisto- prehistoric habitats. cene 2.6 million years ago (Aziz, 2000; Flea- gle et al., 2010; Suraprasit et al., 2016). The MATERIALS AND METHODS migration of fauna to Java Island includes several types (Siswanto & Noerwidi, 2016). For investigating and modeling In Cisaat and Trinil, inhabited by Stegodon Hippopotamus sivalensis habitat and ecology trigonocephalus who came via the Siva- in Java Island, two basic principles need to be Malayan route from Siwalik, Narbada, and accomplished following Roebroeks (2006). Burma. Meanwhile, Elephas and Tapirus First is the identification of the spatial pattern make up the population of Kedungbrubus based on the hippos presence and absence and and Ngandong. Then in Cisaat and Ngandong, then second is explaining such a pattern. The which were inhabited by ancient buffalo. material used to assess the hippos presence At the end of the Pleistocene, sea levels was a fossil identified as Hippopotamus continued to decline and gave rise to a wider sivalensis and fossil specimens were collected area of land between the Asian Continent and through excavation methods following Jukar Java Island. As a result, more species were et al. (2019). Fossil identification reference migrating through this corridor. But in the was based on Boisserie (2005). Holocene era, sea levels rose and fell again The reconstruction of H. sivalensis spa- and submerged the land between the Asian tial habitat patterns in Java Island was assis- Continent and the previously formed Java ted by satellite imaging techniques and on-site Island. This happened about 12 thousand observations of this island following methods years ago (Voris, 2000). performed by Bailey et al. (2011). A combi- In the late Pleistocene, the hippos nation of Landsat satellite images and Shuttle Hippopotamus sivalensis spp. were also Radar Topographic Mission (SRTM-3) were included fauna that migrated to Java Island. used and draped on vertically exaggerated Until recently, fossils of Hippopotamus digital topography to study the landscape fea- sivalensis spp. have been found in various tures. On-site observations aimed to record locations in the central to the east part of Java environmental data at each site of the fossil Island. These species are thought to have lived discovery include geographic coordinates, from the oldest Satir period to Ngandong altitude above sea level (asl), macro and (400 thousand years ago). Currently, the micro habitat conditions (in caves, in valleys). available data now is only fossil records and The fossil presence data were then lack of ecological studies related to those tabulated by including the coordinates and findings. To complement existing data and attributes (asl, macro, and micro habitat knowledge, a habitat, ecology, and biodiver- conditions). Then the data that already has sity modeling of Hippopotamus sivalensis geographic coordinates were mapped using Andriwibowo et al. 94 Jurnal Biodjati 6(1):93-101, May 2021 http://journal.uinsgd.ac.id/index.php/biodjati a geographic information system (GIS). By H. sivalensis itself is estimated to be about 2 overlaying the GIS map, its habitat conditions m in length and 1 m in height (Figure 3). can be analyzed. For statistical analysis, Prin- In Java Island, based on the fossil dis- cipal Component Analysis (PCA) was used covery, the existence of H. sivalensis spp. was using R statistical package (R Core Team, recorded at 7 sites so far and covers a very 2013). The purpose of PCA is to assess the large area (Figure 4). Areas of habitat for correlation of each H. sivalensis population at H. sivalensis spp. estimated to cover most of each site and also the attributes that influence East Java bordered with Central Java (1, 2, 3, the population. Variables to build the PCA in- 5, 7). Meanwhile, some habitats were found cluded altitude above sea levels (m), distance scattered in West (6) and Central Java (4). to coast (km) and habitat (forest, river, valley, Table 1 shows the habitat attributes at the sites cave). where the H. sivalensis spp. which turned out to vary. H. sivalensis spp. found at various RESULTS AND DISCUSSION altitudes with an average of 177 m above sea level (95% CI: 123-232 m). Initially, Hippopotamus sivalensis was The PCA analysis (Figure 5) shows grouped under the Hexaprotodon genus. All habitat variation can affect the diversity species under Hexaprotodon genus have of the H. sivalensis spp. PCA shows that been extinct. Hexaprotodon is characterized H. sivalensis spp. consisted of 3 populations. by its 6 mandibular incisors and known as The first is the population that is grouped hexa. Hexaprotodon was grouped under the together at sites 2, 5, 6, and 7. The second is Hippopotamus genus because of the difference the isolated population in site 1. While the in the shape of the cranium in the lacrimal rest are the populations that were located far part. In addition, H. sivalensis also has a dif- apart at sites 3 and 4. Population grouping of ferent molar arrangement and mandibular H. sivalensis spp. based on PCA is closely shape (Figure 1) (Boisserie, 2005). The most related to the environmental condition of the important character of H. sivalensis is the habitat. There is a separated population as orbital bone in the eye which protrudes up- seen at sites 3 and 4 due to the habitat differ- wards (Bibi & Métais, 2016). These charac- ences of H. sivalensis spp. that were varied ters indicate adaptation to aquatic habitats among populations (Table 1). These differen- which are characteristic of the modern hippos ces were related to the fossil exclusively found of the Hippopotamus genus which has a be- in the cave whereas H. sivalensis spp. was havior of submerging in water. Harrison generally found in the valley. Likewise, the (1997) and Weston (2000) have described H. sivalensis spp. populations at sites 3 and in detail the phylogeny of H. sivalensis 4 occupy habitats close to the coast. But on (Figure 2). The Hippopotamus genus split the contrary H. sivalensis spp. was generally from Hexaprotodon about 6 million years ago.
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