NDLI: Biotic and Abiotic Factors Affecting Brevicoryne brassicae (L.) (Hemiptera: Aphididae) and the Associated Hyperparasitoid Alloxysta fuscicornis Hartig (Hymenoptera: Figitidae) Morphologies

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Neotropical Entomology : Volume 41, Issue 3, June 2012

Neotropical Entomology : Volume 41, Issue 2, April 2012

Neotropical Entomology : Volume 41, Issue 1, February 2012

Biotic and Abiotic Factors Affecting Brevicoryne brassicae (L.) (Hemiptera: Aphididae) and the Associated Hyperparasitoid Alloxysta fuscicornis Hartig (Hymenoptera: Figitidae) Morphologies

Content Provider	Springer Nature Link
Author	Pedroso, H L Sampaio, M V Souto, Kleber Cleanto Faria Lemes
Copyright Year	2012
Abstract	This study investigates the influence of biotic and abiotic factors associated with the morphological development of Brevicoryne brassicae (Linnaeus) and the associated hyperparasitoid Alloxysta fuscicornis (Hartig). The experiment involved the examination of whether aphid size was influenced by their vertical distribution and density on the host plant, as well as whether variations in hyperparasitoid size and symmetry were correlated with those of their aphid hosts. An aphid multivariate size index was obtained using principal component analysis, while symmetry was evaluated in terms of fluctuating asymmetry (FA). Samples were collected in 2007 on cabbage plants cultivated at an experimental farm located in Uberlândia, Minas Gerais, Brazil (18°56′54″ S; 48°12′46″ W). The results demonstrated that the size of B. brassicae was negatively associated with temperature, but not with its vertical distribution on the host plant. Temperature was also negatively correlated with hyperparasitoid size. During warmer periods, females produced large quantities of small-sized offspring, whereas an opposite pattern, i.e. the production of fewer offspring of larger size took place during colder periods. This type of adjustment involving trade-offs between physiological and morphological mechanisms, as well as individual interaction with abiotic environmental factors, such as temperature, can be considered an adaptive plastic response in order to increase the chances of survival at a given locality. The encountered relationship between aphid and hyperparasitoid sizes may be an after effect of their indirectly biotic interaction. Hyperparasitoid FA was dependent on the width of the mummified aphids. However, the hypothesis that temperature and vertical distribution on the host plant might influence FA was not confirmed.
Starting Page	272
Ending Page	277
Page Count	6
File Format	PDF
ISSN	1519566X
Journal	Neotropical Entomology
Volume Number	41
Issue Number	4
e-ISSN	16788052
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-06-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Life Sciences cabbage aphid fluctuating asymmetry Entomology Body size Agriculture population dynamic
Content Type	Text
Resource Type	Article
Subject	Insect Science

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