Potential feeding plants of Javan langur (Trachypithecus auratus) in the eastern slope of Biru Mountain, Batu City, East Java, Indonesia

Wardhana HD, Muttaqin T, Aryanti N, Kurniawan I. 2022. Potential feeding plants of Javan Langur (Trachypithecus auratus)
in the eastern slope of Biru Mountain, Batu City, East Java, Indonesia. Biodiversitas 23: 4216-4222. The Javan langur (Trachypithecus
auratus) is an endemic animal in Indonesia and is located on the island of Java. Javan langur is an endemic primate and an officially
endangered species. The purpose of this study was to determine the potential of forage plants in the area that will be used as a Javan
langur release location so that it becomes one aspect of assessing whether or not it is appropriate for a Javan langur release. This
research was conducted in Gunung Biru, Batu City, East Java, Indonesia. The method used is wandering quarter to determine the species
composition. The analysis used is vegetation analysis, Morisita distribution index, Shannon-Wiener diversity index, Evenness index,
Margalef wealth index, and Sorensen similarity index. The results of this study obtained 45 species of plants from the level of the pole
and tree. Some of the dominant species are Homalanthus giganteus, Quercus sondaicus, Engelhardia spicata, and Trema orientalis. All
types of plants found during the study were included in the Javan langur forage plants. The distribution index was clustered at the pole
and tree level with a value of 0.081 at the pole and 0.106 at the tree. The diversity index was high at the pole level with a value of 3.272,
while the moderate tree level with a value of 2.539. The species richness index showed high at the pole and tree level, with a value of
6.916 at the pole level and 4.461 at the tree level. The evenness of the pole-level vegetation is 0.874 and the tree-level vegetation is
0.789, so it includes a high evenness value. The similarity value between paths below 50% indicates that the similarity is low. Knowing
that all species in the area are a source of forage for langurs, it can be said that the forage sources for Javan langurs are very abundant
and it can be said that the area is very suitable for the release area of Javan langurs.