No full text
Poster (Scientific congresses and symposiums)
Study of sex ratio and morphotypes of the Multicoloured Asian Ladybird, Harmonia axyridis Pallas in Belgian maize
Vandereycken, Axel; Fassotte, Bérénice; Barsics, Fanny et al.
2014Premières rencontres nationales des Coccinellistes
 

Files


Full Text
No document available.

Send to



Details



Keywords :
invasion; Coccinellidae; agroecosystems; abundance
Abstract :
[en] Several insect species are known to have different morphotypes, an adaptation to heterogeneities in changing environments. This phenotypic plasticity could be a factor used by the Multicoloured Asian Ladybird, which is considered as an invasive species in Europe since its introduction in the 80’s. Harmonia axyridis has four major morphotypes: 2 melanic forms, conspicua and spectabilis; and 2 non-melanic, succinea and axyridis. In Belgium, only the three first are observed. Literature reports variations in morphotype frequencies, across native and introduced strains. These variations seem to be linked to climate (geographical and seasonal variation), with non-melanic forms being the most abundant in hot and arid climate. This study focused on the variation of morphotype abundance in H. axyridis according to season, field and gender. Adult ladybirds were caught from mid-July to mid-October 2012 into 5 maize fields. The proportions of observed morphotypes were compared according to the sampling season. The abundance of morphotypes was not significantly different through the fields; the observed ratios were 81.6%, 15% and 3.4% for succinea, spectabilis and conspicua respectively. Succinea was the most observed morphotype (χ2=755.8; P<0.001). The total number of collected males and females was the same with ratios of 48.2% and 51.8%: (χ2=0.93; P=0.33). The sex ratio was also not significantly different for each morphotype. There was no evolution of melanic and non-melanic form ratio according to the season, with 25.6% of melanic form in summer and 20.6% in autumn (χ2=1.22; P=0.27). Our results seem to show that morphotype adaptation according to the climate is not observed for Belgian ladybirds.
Disciplines :
Entomology & pest control
Author, co-author :
Vandereycken, Axel ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Fassotte, Bérénice ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Barsics, Fanny ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Durieux, Delphine ;  Université de Liège - ULiège > Chimie et bio-industries > Laboratoire Qualité et sécurité des produits agro-aliment.
Joie, Emilie ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Francis, Frédéric  ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Haubruge, Eric  ;  Université de Liège - ULiège > Premier Vice-Recteur
Verheggen, François  ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Language :
English
Title :
Study of sex ratio and morphotypes of the Multicoloured Asian Ladybird, Harmonia axyridis Pallas in Belgian maize
Publication date :
October 2014
Number of pages :
A0
Event name :
Premières rencontres nationales des Coccinellistes
Event place :
Angers, France
Event date :
30 et 31 octobre 2014
Audience :
International
Available on ORBi :
since 18 November 2014

Statistics


Number of views
133 (7 by ULiège)
Number of downloads
0 (0 by ULiège)

Bibliography


Similar publications



Contact ORBi