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Structure d'âge et dynamique des populations de Amblyseius manihoti Moraes (Acari: Phytoseiidae) sur Manioc au Brésil

Published online by Cambridge University Press:  19 September 2011

O. Bonato ,
A. C. Da S. Noronha ,
T. Cuellar  and
G. De Moraes
O. Bonato
Affiliation:
IRD (ex ORSTOM), Avenue Val de Montferrand – B.P. 5045, 34032 Montpellier Cedex 1, France
A. C. Da S. Noronha
Affiliation:
EMBRAPA-CNPMF, C.P. 007, 44380-000 Cruz Das Almas, BA, Brasil
T. Cuellar
Affiliation:
IAC, Av. Barão Itapura, 1481 Campinas, SP, Brasil
G. De Moraes
Affiliation:
ESALQ-USP, Departamento Zoologia, C.P. 9, 13418-900 Piracicaba, SP, Brasil
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Abstract

The number of eggs and mobiles (immatures and adults) of Amblyseius manihoti on entire plants was determined during a 10-month period in a cassava field located in the Bahia region of Brazil. Observed percentages of eggs, immatures and adults were compared to theoretical stable age distributions (58 % for eggs, 24 % for immatures and 18 % for adults). These comparisons served as a basis to discuss the influence of fecundity, mortality and migration on the age structure of populations.

Résumé

Un comptage des oeufs et des formes mobiles (immatures et adultes) du phytoséiide Amblyseius manihoti présents sur la plante entière a été réalisé pendant dix mois (soit 90 plantes analysées) dans un champ de manioc de la région de Bahia (Brésil). Les proportions d'oeufs, d'immatures et d'adultes observées au champ sont comparées aux distributions d'âge stable théoriques (oeufs: 58 %, immatures: 24 %, adultes: 18 %). La comparaison des distributions théoriques aux observées permet de spéculer sur l'influence de facteurs tels que la fécondité, la mortalité et la migration sur la structure d'âge des populations.

Keywords

Amblyseius manihotimaniocacarienphytoséiideAmblyseius manihoticassava mitephytoseiid
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 21 , Issue 3 , September 2001 , pp. 207 - 212
Copyright
Copyright © ICIPE 2001

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