Morphometric study of the palm weevils Rhynchophorus vulneratus and R. Ferrugineus (Coleoptera: Curculionidae) in view of insular and mainland populations of Malaysia

Faszly Rahim, . and Izfa Riza Hazmi, . and Abdul Aziz Jemain, . and Siti Nurlydia Sazali, . and Fatimah Abang, . Morphometric study of the palm weevils Rhynchophorus vulneratus and R. Ferrugineus (Coleoptera: Curculionidae) in view of insular and mainland populations of Malaysia. pp. 1329-1340. ISSN 1511-3701

A morphometric analysis was conducted on Rhynchophorus vulneratus and R. ferrugineus (Coleoptera: Curculionidae) from insular and mainland populations. Twenty-three morphological characters were measured and the data were analysed using independent t-test principal component analysis (PCA) and discrimination function analysis (DFA). Using independent t-test all characters were found to be significant at p 0.05 except distance between eyes (ED) mesotarsus length (F2Ta) and metatarsus length (F3Ta). In PCA cumulative variations of 80.7 were recorded from the first two principal components resulting from high loadings in elytra length (EL) elytra width (EW) and pronotum length (PL). For DFA a single function explained a canonical correlation of 0.952 with 100.0 of variation and the Wilks Lambda statistics (0.094) was strongly supported with p 0.0001. The highest character loadings were the total length (TL) elytra width (EW) and pronotum length (PL) which were useful as diagnostic characters for separating both Rhynchophorus species. Therefore this study suggests that R. vulneratus and R. ferrugineus are morphologically distinct species. This finding proves that the insular population of R. vulneratus fits the generality of the island rule as being larger compared to the mainland counterparts of R. ferrugineus .

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Abstract

A morphometric analysis was conducted on Rhynchophorus vulneratus and R. ferrugineus (Coleoptera: Curculionidae) from insular and mainland populations. Twenty-three morphological characters were measured and the data were analysed using independent t-test principal component analysis (PCA) and discrimination function analysis (DFA). Using independent t-test all characters were found to be significant at p 0.05 except distance between eyes (ED) mesotarsus length (F2Ta) and metatarsus length (F3Ta). In PCA cumulative variations of 80.7 were recorded from the first two principal components resulting from high loadings in elytra length (EL) elytra width (EW) and pronotum length (PL). For DFA a single function explained a canonical correlation of 0.952 with 100.0 of variation and the Wilks Lambda statistics (0.094) was strongly supported with p 0.0001. The highest character loadings were the total length (TL) elytra width (EW) and pronotum length (PL) which were useful as diagnostic characters for separating both Rhynchophorus species. Therefore this study suggests that R. vulneratus and R. ferrugineus are morphologically distinct species. This finding proves that the insular population of R. vulneratus fits the generality of the island rule as being larger compared to the mainland counterparts of R. ferrugineus .

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Item Type:	Article
AGROVOC Term:	Rhynchophorus
AGROVOC Term:	Weevils
AGROVOC Term:	Rhynchophorus ferrugineus
AGROVOC Term:	Coleoptera
AGROVOC Term:	Curculionidae
AGROVOC Term:	Animal morphology
AGROVOC Term:	Measurement
AGROVOC Term:	Component analysis (statistics)
AGROVOC Term:	Eyes
AGROVOC Term:	Metatarsus
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24818

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