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All Journal HAYATI Journal of Biosciences Prosiding Seminar Biologi Biocelebes TREUBIA ZOO INDONESIA Journal of Tropical Ethnobiology Zoo Indonesia
Anang Setiawan Achmadi
Museum Zoologicum Bogoriense, Pusat Penelitian Biologi LIPI Gedung Widyasatwaloka, Jl. Jakarta-Bogor Km. 46, Cibinong 16911, Jawa Barat
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Other

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COMPARISON BETWEEN Trachypithecus auratus AND Trachypithecus cristatus BRAIN SIZE IN INDONESIA Endah Dwijayanti; Anang Setiawan Achmadi; Maharadatunkamsi Maharadatunkamsi; Nanang Supriatna
ZOO INDONESIA Vol 29, No 1 (2020): Juli 2020
Publisher : Masyarakat Zoologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52508/zi.v29i1.3977

Abstract

Taxonomic studies on Trachypithecus species in Indonesia define that this genus separated into two species that are Trachypithecus auratus and Trachypithecus cristatus with Trachypithecus auratus auratus as a subspecies. To determine relative brain size differences between species of the genus Trachypithecus in Indonesia and to examine clinal variation, a study related to brain size and morphological characters that affect the brain size is carried out. This study analyzes the brain volume between both species and examines its relationship with morphometric measurement and variables such as sex, age, and specimen location. Brain volumes were calculated from braincase volumes using 0.5 mm silica gel as mini beads. This study reveals that there are significant differences in relative brain size inter-species, sex, age and interaction among variable. Overall, T. auratus have a bigger brain size than T. cristatus, and the brain size of males are larger than females. The older individual tends to have similar brain size with younger ones. The different relative brain size on age level influenced by GSL size. Allometric body size affects the size of the brain directly. Also, there is a clinal trend in relative brain size. Trachypithecus auratus brain size is increasing from West Java to Lombok island. Further study is needed to understand the influence of external factor such as ecological and social factors on brain size in Trachypithecus.
Variation and Distribution of the Sulawesi Giant Rat (Paruromys dominator) Based on Morphological Approaches Dwijayanti, Endah; Suryobroto, Bambang; Widayati, Kanthi Arum; Achmadi, Anang Setiawan
HAYATI Journal of Biosciences Vol. 31 No. 6 (2024): November 2024
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.31.6.1037-1049

Abstract

Correlations between natural geographic boundaries and variations in organisms' morphology have been well-documented in Sulawesi Island, which has a unique geological history and hundreds of endemic species. One of the widely distributed species of small mammals is Sulawesi giant rat (Paruromys dominator). Considering the geographic condition of Sulawesi, this species is a suitable model for studying geographic influences on morphological change. Moreover, there are no comprehensive studies on this species. Previous studies cannot fully explain the variability due to the lack of representative samples. Here, we measure 19 skull characteristics for 131 adult complete-skull specimens from six distribution areas in Sulawesi. We investigate the variation in skull characteristics using agglomeration nesting (AGNES) for cluster analysis and the standardized major axis (SMA) for allometry analysis. Our results show that P. dominator can be categorized into two groups, but distribution areas, elevation, or sex do not influence those. P. dominator in group 1 had a larger skull size than group 2. The two groups can be distinguished from four characteristics: breadth of mesopterygoid fossa (BMF), breadth of first upper molar (BM1), length of the auditory bulla (LB), and breadth of incisive foramina (BIF). The BMF and BM1 are related to mastication, and the LB and BIF are related to communication. We propose that the skull variation of this species is not correlated with geographical barriers but more clearly correlated with their feeding habits, mating behavior, and ability to escape predation. These findings were useful for future studies on the taxonomic status of P. dominator.
Co-Authors Annawaty Annawaty, Annawaty Bambang Suryobroto Dwijayanti, Endah Endah Dwijayanti Esti Munawaroh Hari Nugroho Hitoshi Suzuki Jacob A. Esselstyn Jacob A. Esselstyn, Jacob A. KANTHI ARUM WIDAYATI Kevin C. Rowe Kevin C. Rowe, Kevin C. Maharadatunkamsi Maharadatunkamsi Nanang Supriatna Risdayanti Adi Purba St. Aisyah Sijid Y. Purwanto Zulkurnia Irsaf