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Separation of Agromyzidae species and populations associated with legumes using discriminant analysis

Published online by Cambridge University Press:  19 September 2011

Beatrice Tengecho Chemengich
Beatrice Tengecho Chemengich
Affiliation:
Department of Zoology, Kenyatta University, P.O. Box 43844, Nairobi
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Abstract

Agromyzidae populations occurring in legumes in Kenya were tested for speciation at host-type level and at the species level using discriminant analysis. Measurements were taken of various morphological characters of five populations of Chromatomyia horticola from five host plants and of seven male and female agromyzid species. The ratio of the proximal to the distal part of the wing vein, (M3+4) provided the best discrimination for five host populations of C. horticola; the species was separated into two distinct groups by this character. Females of Ophiomyia spencerella and O. phaseoli were distinct. However, overlap existed in male O. spencerella, O. phaseoli and C. horticola. In addition, there was overlap in female O. phaseoli, Tropicomyia vigneae and Liriomyza trifolii. The best discrimination in the male populations was obtained using the ratio of the proximal to the distal part of wing vein (M3+4). In the female populations, the best discriminating character was hind tibia length.

Résumé

Les populations d'agromyzidés rencontrés au sein des légumineuses au Kenya ont été soumises à une analyse discriminatoire pour tester l'affinité des espèces et leurs plantes-hôtes. Divers caractères morphologiques ont été mesurés sur cinq populations de Chromatomyia horticola provenant de cinq plantes-hôtes, et sur sept espèces d'agromyzidés mâles et femelles. Le rapport des mensurations de la partie proximale à la partie distale de la nervure alaire, (M3+4) donnait la meilleure discrimination pour cinq populations provenant des plantes-hôtes de C. horticola, et l'espèce fut divisée en deux groupes distincts suivant ce caractère. Les femelles d' Ophiomyia spencerella et celles d'O. phaseoli étaient distinctes. Cependant un chevauchement existait au sein des mâles d'O. spencerella, d'O. phaseoli et C. horticola. De plus, le même chevauchement était observé au sein des femelles d'O. phaseoli, de Tropicomyia vigneae et de Liriomyza trifolii. La meilleure discrimination au sein des populations mâles était obtenue par utilisation du rapport des mensurations de la partie proximale à la partie distale de la nervure alaire (M3+4). Pour les populations femelles, le meilleur caractère discriminatoire fut la longueur du tibia de la patte postérieure.

Keywords

morphometricsdiscriminant analysislegumesAgromyzidaemesures morphométriquesanalyse discriminatoirelégumineusesAgromyzidae
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 1 , March 1998 , pp. 67 - 76
Copyright
Copyright © ICIPE 1998

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