Comparative sensitivity to methyl eugenol of four putative Bactrocera dorsalis complex sibling species – further evidence that they belong to one and the same species B. dorsalis

By

Hee, Alvin
Ooi, Yue-Shin
Wee, Suk-Ling
Tan, Keng-Hong

Type

Article

Date of Publication

2015

Original Publication

ZooKeys

Volume

540

Pages

313-321

Subjects

B. invadens , B. papayae , B. philippinensis , Bactrocera dorsalis , lure sensitivity , male response , methyl eugenol

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.540.6099

 

Abstract

Males of certain species belonging to the Bactrocera dorsalis complex are strongly attracted to, and readily feed on methyl eugenol (ME), a plant secondary compound that is found in over 480 plant species worldwide. Amongst those species is one of the world’s most severe fruit pests the Oriental fruit fly, B. dorsaliss.s., and the former taxonomic species B. invadens, B. papayae and B. philippinensis. The latter species have been recently synonymised with B. dorsalis based on their very similar morphology, mating compatibility, molecular genetics and identical sex pheromones following consumption of ME. Previous studies have shown that male fruit fly responsiveness to lures is a unique phenomenon that is dose species-specific, besides showing a close correlation to sexual maturity attainment. This led us to use ME sensitivity as a behavioural parameter to test if B. dorsalis and the three former taxonomic species had similar sensitivity towards odours of ME. Using Probit analysis, we estimated the median dose of ME required to elicit species’ positive response in 50% of each population tested (ED50). ED50 values were compared between B. dorsalis and the former species. Our results showed no significant differences between B. dorsaliss.s., and the former B. invadens, B. papayae and B. philippinensis in their response to ME. We consider that the Bactrocera males’ sensitivity to ME may be a useful behavioural parameter for species delimitation and, in addition to other integrative taxonomic tools used, provides further supportive evidence that the four taxa belong to one and the same biological species, B. dorsalis.