Evidence of natural hybridization between two sympatric sibling species of Bactrocera dorsalis complex based on pheromone analysis

Bactrocera carambolae and B. papayae are major fruit fly pests and sympatric sibling species of the B. dorsalis complex. They possess distinct differences in male pheromonal components. In the 1990's, wild Bactrocera fruit flies with morphological traits intermediate between those of B. carambo...

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Bibliographic Details
Published in:Journal of chemical ecology 2005-04, Vol.31 (4), p.845-858
Main Authors: Wee, S.L, Tan, K.H
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Bacteria
Bactrocera
Bactrocera carambolae
Bactrocera dorsalis
Biological and medical sciences
Chemical analysis
chemical composition
Eugenol - analogs & derivatives
Eugenol - pharmacology
Fruits
Fundamental and applied biological sciences. Psychology
General aspects
Hybridization
Hybridization, Genetic
Hybrids
insect pests
Male
Pest Control, Biological
Pheromones
Pheromones - analysis
Salt Gland - chemistry
Salt Gland - secretion
sex pheromones
Sexual Behavior, Animal - physiology
Tephritidae - chemistry
Tephritidae - genetics
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Summary:Bactrocera carambolae and B. papayae are major fruit fly pests and sympatric sibling species of the B. dorsalis complex. They possess distinct differences in male pheromonal components. In the 1990's, wild Bactrocera fruit flies with morphological traits intermediate between those of B. carambolae and B. papayae were often captured in traps baited with methyl eugenol (ME). Chemical analyses of rectal glands of ME-fed males revealed that the laboratory F1, F2, and backcross hybrids possessed ME-derived sex pheromonal components ranging from that typical of B. papayae to that of B. carambolae without any specific trend, which included a combination of pheromonal components from both parental species within an individual hybrid. ME-fed hybrids without any ME-derived pheromonal components were also detected. Further chemical analysis of rectal glands from wild Bactrocera males, after ME feeding in the laboratory, showed a combination of pheromonal components similar to that found in the ME-fed, laboratory-bred hybrids. These findings present circumstantial evidence for the occurrence of a natural hybrid of the two Bactrocera species.
ISSN:0098-0331
1573-1561
DOI:10.1007/s10886-005-3548-6