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Sexual dimorphism in Ephedrus persicae (Hymenoptera: Braconidae: Aphidiinae): intraspecific variation in size and shape

Published online by Cambridge University Press:  02 April 2012

Ana Mitrovski Bogdanović ,
Ana Ivanović ,
Željko Tomanović ,
Vladimir Žikić ,
Petr Starý  and
Nickolas G. Kavallieratos
Ana Mitrovski Bogdanović
Affiliation:
Institute of Biology and Ecology, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia
Ana Ivanović
Affiliation:
Institute of Zoology, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia
Željko Tomanović*
Affiliation:
Institute of Zoology, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia
Vladimir Žikić
Affiliation:
Department of Biology and Ecology, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia
Petr Starý
Affiliation:
Institute of Entomology, Academy of Sciences of the Czech Republic, Branišovská 31, 37005 České Budějovice, Czech Republic
Nickolas G. Kavallieratos
Affiliation:
Laboratory of Agricultural Entomology, Department of Entomology and Agricultural Zoology, Benaki Phytopathological Institute, 8 Stefanou Delta Street, 145 61 Kifissia, Attica, Greece
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Sexual dimorphism in size and shape has been studied in a wide range of organisms, but intraspecific variation in sexual dimorphism remains largely unexplored. In many parasitoid species the diversity of morphological-variation patterns within species is complicated by host effects. It is not known whether the magnitude and direction of sexual size dimorphism can be affected by the developmental environment (i.e., different host species). In this study we explored patterns of sexual dimorphism in size and shape in the aphid parasitoid Ephedrus persicae Froggatt. The analyzed sample consisted of 83 females and 54 males reared from five species of host aphids (Hemiptera: Aphididae) from various areas of the Palaearctic region. The most notable result of the study is that E. persicae displays divergent patterns of sexual dimorphism in body size and wing size: females have larger bodies than males, but males have larger wings. Our analysis of wing size and wing shape also showed significant within species variation in the degree and pattern of sexual dimorphism. Variation in wing shape between the sexes seems to be more conserved than variation in wing size. Variation in wing shape is influenced predominantly by host (biotype) and to a lesser extent by sexual dimorphism within a biotype.

Résumé

On a étudié le dimorphisme sexuel de la taille et de la forme chez une variété d’organismes, mais on a peu exploré la variation intraspécifique du dimorphisme sexuel. Chez plusieurs espèces de parasitoïdes, la diversité des patrons de variation morphologique au sein des espèces est compliquée par les effets de l’hôte. On ne sait pas si l’importance et la direction du dimorphisme sexuel de la taille peuvent être affectées par le milieu de développement (c’est-à-dire les différentes espèces d’hôtes). Nous explorons, dans notre étude, les patrons de taille et de forme du dimorphisme sexuel chez le parasitoïde des pucerons Ephedrus persicae Froggatt (Hymenoptera: Braconidae: Aphidiinae). Notre échantillon d’analyse comprend 83 spécimens femelles et 54 mâles élevés sur cinq pucerons (Hemiptera: Aphididae) hôtes de diverses régions de la zone paléarctique. Le résultat le plus intéressant de notre étude est qu’E. persicae possède des patrons divergents du dimorphisme sexuel de la taille de la taille corporelle et de la grandeur de l’aile: les femelles ont un corps plus grand que les mâles, mais les mâles ont des ailes plus étendues. Notre analyse de la taille de l’aile et de la forme de l’aile montre aussi des variations intraspécifiques significatives de l’importance et du patron du dimorphisme sexuel. La variation de la forme de l’aile entre les sexes semble est plus préservée que la variation de la taille de l’aile. La variation de la forme de l’aile est influencée principalement par les hôtes (biotypes) et, de façon moins importante, par le dimorphisme sexuel au sein du biotype.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 141 , Issue 6 , December 2009 , pp. 550 - 560
Copyright
Copyright © Entomological Society of Canada 2009

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