Morphometric study of the palm weevils, rhynchophorus vulneratus and r. ferrugineus (coleoptera

Curculionidae) in view of insular and mainland populations of Malaysia

Siti Nurlydia Sazali, Izfa Riza Hazmi, Fatimah Abang, Faszly Rahim, Abdul Aziz Jemain

Research output: Contribution to journalArticle

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 Wilk's 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.

Original languageEnglish
Pages (from-to)1329-1340
Number of pages12
JournalPertanika Journal of Tropical Agricultural Science
Volume41
Issue number3
Publication statusPublished - 1 Aug 2018

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Rhynchophorus
Curculionidae
Malaysia
Coleoptera
Rhynchophorus ferrugineus
principal component analysis
metatarsus
statistics
eyes

Keywords

  • Insular population
  • Mainland
  • Morphometrics
  • Rhynchophorus
  • Weevils

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

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title = "Morphometric study of the palm weevils, rhynchophorus vulneratus and r. ferrugineus (coleoptera: Curculionidae) in view of insular and mainland populations of Malaysia",
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 Wilk's 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.",
keywords = "Insular population, Mainland, Morphometrics, Rhynchophorus, Weevils",
author = "Sazali, {Siti Nurlydia} and Hazmi, {Izfa Riza} and Fatimah Abang and Faszly Rahim and Jemain, {Abdul Aziz}",
year = "2018",
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T2 - Curculionidae) in view of insular and mainland populations of Malaysia

AU - Sazali, Siti Nurlydia

AU - Hazmi, Izfa Riza

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AU - Rahim, Faszly

AU - Jemain, Abdul Aziz

PY - 2018/8/1

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