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All Journal Jurnal Entomologi Indonesia Biodiversitas Journal of Biological Diversity
Walter Ajambang
Oil Palm Research Program, Institut of Agricultural Research for Development Douala. B. P. 2123, Messa-Yaounde, Cameroon
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Molecular identification and population genetic study of Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) from Indonesia, Malaysia and Cameroon based on mitochondrial gene Van Basten Tambunan; Ardha Apriyanto; Walter Ajambang; Culbertson Enow Etta; Bandung Sahari; Damayanti Buchori; Purnama Hidayat
Biodiversitas Journal of Biological Diversity Vol. 21 No. 7 (2020)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d210749

Abstract

Abstract. Tambunan VB, Apriyanto A, Ajambang W, Etta CE, Sahari B, Buchori D, Hidayat P. 2020. Molecular identification and population genetic study of Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) from Indonesia, Malaysia and Cameroon based on mitochondrial gene. Biodiversitas 21: 3263-3270. Oil palm pollinating weevil Elaeidobius kamerunicus is a very important insect pollinator in oil palm plantation. However, there is still lack of information about molecular identification and population genetic study in this species. The purpose of this study was to explore the effectiveness of oil palm pollinating weevil identification using mitochondrial DNA of COI gene and to assess its genetic variation between different locations and countries. We sequenced the DNA barcode of 36 individuals of this species using the mtDNA Cytochrome Oxidase I (COI) gene to explore their genetic variation, identity and phylogenetic relationship. The COI gene sequences generated from this study were successful in identifying E. kamerunicus. Phylogenetic analysis also revealed 3 well-supported monophyletic haplogroups of E. kamerunicus population. In addition, genetic differentiation analysis revealed that most populations from Indonesia were different from Malaysian and Cameroonian populations indicating that there was a genetic variation between the population samples from these countries. The overall E. kamerunicus used in this study were geographically structured in two regions; outside Indonesia region (Cameroon and Malaysia) and Indonesia region. These results demonstrate the feasibility of using COI gene sequence for molecular identification and population genetic study of E. kamerunicus species.
Variation in body size and morphometric trait of Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) from Indonesia, Malaysia, and Cameroon Van Basten Tambunan; Bandung Sahari; Satyoso Hartjotedjo; Cahyo Sri Wibowo; Walter Ajambang; Culbertson Enow Etta; Damayanti Buchori; Purnama Hidayat
Jurnal Entomologi Indonesia Vol 23 No 2 (2026): July
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.23.2.99

Abstract

Elaeidobius kamerunicus Faust. is an insect pollinator introduced from Africa and has become the main pollinator of oil palm (Elaeis guineensis Jacq.) in Indonesia. The presence of E. kamerunicus in Indonesia is reported to increase the fruit set of oil palm. However, the success of pollination shown by the proportion of normal fruit fluctuates under field conditions and tends to decline from year to year. The ineffectiveness of this pollination is caused by the reduced visitation activity of E. kamerunicus to female inflorescences. The performance of pollinator, including the issue of body size is thought to be one of the factors that cause a decrease in efficiency and effectiveness of pollination. This study aimed to determine the differences in body size of E. kamerunicus from Indonesia, Malaysia and Cameroon specifically. The studies were carried out from October 2018 to May 2019. Adults of E. kamerunicus were taken from male anthesising flowers, ten parts of the body were measured. This study showed that there were variations in the body size of E. kamerunicus among Indonesia, Malaysia and Cameroon. The largest body size was found in E. kamerunicus from Cameroon, whilst the smallest body size was observed in Malaysian populations for both male and female. The difference in body length (BL) between native and introduced populations reached 0.22 mm (males) and 0.32 mm (females). These findings indicate that introduced populations exhibit smaller body sizes compared to native populations. Information on the variation in the body size in this study might be valuable for developing management strategies to increase oil palm fruit set in Indonesia.
Co-Authors Ardha Apriyanto Bandung Sahari Bandung Sahari Cahyo Sri Wibowo Culbertson Enow Etta Culbertson Enow Etta Damayanti Buchori Damayanti Buchori PURNAMA HIDAYAT Satyoso Hartjotedjo Van Basten Tambunan Van Basten Tambunan