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Identification and optimization of microbial attractants for Philornis downsi, an Invasive fly parasitic on Galapagos birds.

Por:

Cha, Dong H

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ArtículoIdioma: Inglés Tema(s):

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21 578.65

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En: J Chem Ecol (Oct 2016), p. 1-2Tema: We investigated the role of olfactory cues from actively fermenting yeast (Saccharomyces cerevisiae) in attraction of adult Philornis downsi and identified two synergistically attractive yeast volatiles. Larvae of this invasive fly parasitize the hatchlings of passerines and threaten the Galapagos avifauna. Gas chroma-tography coupled with electroantennographic detection (GC-EAD), coupled gas chromatography-mass spectrometry (GC-MS), and field trapping experiments were used to identify volatile compounds from a yeast-sugar solution. EAD responses were consistently elicited by 14 yeast volatiles. In a series of field trap-ping experiments, a mixture of the 14 EAD-active compounds was similarly attractive to P. downsi when compared to the yeast sugar solution, and we found that acetic acid and ethanol were essential for attraction. A mixture of 0.03 % acetic acid and 3 % ethanol was as attractive as the 14-component blend, but was not as attractive as the yeast-sugar solution. Philornis downsi showed positive and negative dose-responses to acetic acid in the ranges of 0.01 ~ 0.3 % and 0.3 ~ 9 %, respectively. Further optimization showed that the mixture of 1 % acetic acid and 3 % ethanol was as attractive as the yeast-sugar solution. Both mixtures of acetic acid and ethanol were more selective than the yeast-sugar solution in terms of non-target moths and Polistes versicolor wasps captured. These results indicate that acetic acid and ethanol produced by yeasts are crucial for P. downs I attraction to fermented materials on which they feed as adults and can be used to manage this invasive fly in Galapagos.

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Imagen de cubierta	Tipo de ítem	Biblioteca actual	Biblioteca de origen	Colección	Ubicación en estantería	Signatura topográfica	Materiales especificados	Info Vol	URL	Copia número	Estado	Notas	Fecha de vencimiento	Código de barras	Reserva de ítems	Prioridad de la cola de reserva de ejemplar	Reservas para cursos
	Artículo	Corley Smith Library Artículos		Galápagos		578.65 CHA (Navegar estantería(Abre debajo))					Disponible			2017-2092
	Documento electrónico	Corley Smith Library Colección PDF		Galápagos		578.65 CHA 2016 (Navegar estantería(Abre debajo))					Disponible			2021-1381

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Previo								Siguiente
Previo	578 LAN 2001 Biogeografía de las islas Galápagos :	578.09 GRE 2001 Biogeography and evolution of the Galapagos :	578.62 TOR 2017 Alien species pathways to the Galapagos Islands, Ecuador /	578.65 CHA 2016 Identification and optimization of microbial attractants for Philornis downsi, an Invasive fly parasitic on Galapagos birds.	578.65 LEV 2013 Multiple lineages of avian malaria parasites (Plasmodium) in the Galápagos Islands and evidence for arrival via migratory birds /	578.65 LEV 2016 Local parasite lineage sharing in temperate grassland birds provides clues about potential origins of Galapagos avian Plasmodium /	578.65 ROD 2007 The epidemiology of Taenia spp. And cysticercosis in Ecuador /	Siguiente

We investigated the role of olfactory cues from actively fermenting yeast (Saccharomyces cerevisiae) in attraction of adult Philornis downsi and identified two synergistically attractive yeast volatiles. Larvae of this invasive fly parasitize the hatchlings of passerines and threaten the Galapagos avifauna. Gas chroma-tography coupled with electroantennographic detection (GC-EAD), coupled gas chromatography-mass spectrometry (GC-MS), and field trapping experiments were used to identify volatile compounds from a yeast-sugar solution. EAD responses were consistently elicited by 14 yeast volatiles. In a series of field trap-ping experiments, a mixture of the 14 EAD-active compounds was similarly attractive to P. downsi when compared to the yeast sugar solution, and we found that acetic acid and ethanol were essential for attraction. A mixture of 0.03 % acetic acid and 3 % ethanol was as attractive as the 14-component blend, but was not as attractive as the yeast-sugar solution. Philornis downsi showed positive and negative dose-responses to acetic acid in the ranges of 0.01 ~ 0.3 % and 0.3 ~ 9 %, respectively. Further optimization showed that the mixture of 1 % acetic acid and 3 % ethanol was as attractive as the yeast-sugar solution. Both mixtures of acetic acid and ethanol were more selective than the yeast-sugar solution in terms of non-target moths and Polistes versicolor wasps captured. These results indicate that acetic acid and ethanol produced by yeasts are crucial for P. downs I attraction to fermented materials on which they feed as adults and can be used to manage this invasive fly in Galapagos.

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