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Measuring the performance of aphids: fecundity versus biomass1

Published online by Cambridge University Press:  02 April 2012

Robert J. Lamb ,
Patricia A. MacKay  and
Samuel M. Migui
Robert J. Lamb*
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
Patricia A. MacKay
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Samuel M. Migui
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
2Corresponding author (e-mail: rlamb@agr.gc.ca).
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Abstract

Fecundity and biomass of nine species of aphids (Hemiptera: Aphididae) feeding on six species of plants were compared to assess whether the two measures are equally effective for quantifying aphid performance. Performance was quantified by measuring both fecundity (the number of offspring born over a defined interval) and biomass (the dry mass of offspring produced) using three variables expected to affect performance: host-plant genotype, aphid genotype, and aphid density. The efficacy of the performance parameters was assessed by comparing their ability to discriminate among treatments for the three variables. Biomass usually provided a more effective measure of performance than fecundity, but for one aphid species, fecundity was more effective than biomass. Biomass of offspring is the preferred measure of performance, but biomass and fecundity should both be recorded whenever practical.

Résumé

Nous avons comparé la fécondité et la biomasse chez neuf espèces de pucerons pour savoir si ces mesures sont également efficaces pour évaluer la performance des pucerons. Nous avons calculé la performance en mesurant à la fois la fécondité (nombre de rejetons nés pendant un intervalle défini) et la biomasse (masse sèche des rejetons produits) en fonction de trois variables pouvant affecter la performance, le génotype de la plante hôte, le génotype des pucerons et la densité de pucerons. L’efficacité des mesures de la performance est déterminée d’après leur capacité à distinguer entre les traitements expérimentaux pour les trois variables. La biomasse s’avère généralement une mesure plus efficace de la performance que n’est la fécondité. Cependant, chez une espèce de puceron, la fécondité fait une meilleure discrimination de la performance que la biomasse. La biomasse des rejetons est donc la mesure à retenir pour évaluer la performance, mais il serait bon de noter conjointement la fécondité et la biomasse.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 141 , Issue 4 , August 2009 , pp. 401 - 405
Copyright
Copyright © Entomological Society of Canada 2009

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Footnotes

1

Contribution No. 1975 of the Cereal Research Centre.

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