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Bull Entomol Res

Title:		Host gut microorganisms' cues mediate orientation behaviour in the larva of the parasitoid Mallophora ruficauda
Author(s):		Groba HF; Castelo MK;
Address:		"Grupo de Investigacion en Ecofisiologia de Parasitoides (GIEP),Departamento de Ecologia,Genetica y Evolucion- Instituto IEGEBA (CONICET - UBA),Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires,Intendente Guiraldes 2160,Ciudad Universitaria,Pabellon II,(C1428EHA) Ciudad de Buenos Aires,Argentina"
Journal Title:		Bull Entomol Res
Year:		2016
Volume:		20151102
Issue:		1
Page Number:		81 - 90
DOI:		10.1017/S0007485315000838
ISSN/ISBN:		1475-2670 (Electronic) 0007-4853 (Linking)
Abstract:		"The robber fly Mallophora ruficauda is one of the most important apicultural pests in the Pampas region of Argentina. This species is a parasitoid of scarab beetle larvae. Females lay eggs away from the host, and the larvae perform active search behaviour toward Cyclocephala signaticollis third instar larvae, parasitoid's preferred host. This behaviour is mediated by host-related chemical cues produced in hosts' fermentation chamber. Also, C. signaticollis larvae are attracted to fermentation chamber extracts. As scarab larvae have microbe-rich fermentation chamber, it has been suggested that microorganisms could be involved in the production of these semiochemicals. The aims of this work were first to ascertain the presence of microorganisms in the fermentation chamber of C. signaticollis larvae and second to determine the role of microorganisms in the orientation response of parasitoid and host larvae. We found that microorganisms-free C. signaticollis larvae showed deterioration in their development and did not produce the attractive semiochemicals. Therefore, we isolated fermentation chamber microorganisms of host larvae by means of different cultures media, and then, assayed different microorganisms' stimuli by binary choice tests. We were able to isolate microorganisms and determine that M. ruficauda larvae are attracted to semiochemicals from protein degradation in the fermentation chamber. However, C. signaticollis larvae were not attracted to any semiochemicals associated with microorganisms' activity in the fermentation chamber. Although we were unable to elucidate the exact role of gut microorganisms in host behaviour, we discuss their relevance in parasitoid host-seeking behaviour and host conspecific interaction in M. ruficauda-C. signaticollis system"
Keywords:		"Animals Behavior, Animal/*physiology Coleoptera/growth & development/*microbiology/*parasitology Cues Diptera/growth & development/*parasitology/*physiology *Gastrointestinal Microbiome Host-Parasite Interactions/*physiology Larva/growth & development/mic;"
Notes:		"MedlineGroba, H F Castelo, M K eng Research Support, Non-U.S. Gov't England 2015/11/03 Bull Entomol Res. 2016 Feb; 106(1):81-90. doi: 10.1017/S0007485315000838. Epub 2015 Nov 2"