Assessment of genetic and pheromonal diversity of the Cydia strobilella species complex (Lepidoptera: Tortricidae)
Author
Summary, in English
Combining pheromone trapping and genetic analyses can be useful when
trying to resolve complexes of closely related insect taxa that are difficult to distinguish
based on morphological characters. Nearctic and Palearctic populations of the spruce
seed moth, Cydia strobilella L., have been considered taxonomically synonymous
since 1983, but more recent work revealing distinct sex pheromones for Canadian
and Swedish moths suggest that populations in the two regions belong to different
species. In order to test this hypothesis, we performed field trapping using different
pheromone lures at ten sites in North America, Europe and Asia, and reconstructed
phylogenetic relationships among trapped moths using mitochondrial (cytochrome
oxidase subunit I ) and nuclear (elongation factor 1 alpha) DNA sequence data.
Trapping data and tree topologies for both genes revealed distinct pherotypes in North
America and Eurasia. A genetically distinct population from China was investigated
further with respect to its sex pheromone. Electrophysiological data indicated that
Chinese females produce a deviant ratio of the sex pheromone components (dienic
acetates) compared to Swedish females. However, trapping experiments in both areas
revealed a similar broad response profile in males to a wide range of acetate ratios,
and these populations should be considered taxonomically synonymous. A previous
suggestion of an agonistic effect on the attraction of C. strobilella males in Sweden
when adding the corresponding alcohols to the binary acetate blend was also tested
in Sweden as well as in China, with no observed effect on attraction of males. In conclusion, our study demonstrates the great potential of using pheromone trapping
as a tool for identification and delimitation of taxa within cryptic species complexes.
Based on our data, Nearctic and Palearctic populations of C. strobilella should be
considered different species, and C. youngana Kearfott stat. rev. is resurrected here
as valid name for North American populations, which was the case before the revision
in 1983.
trying to resolve complexes of closely related insect taxa that are difficult to distinguish
based on morphological characters. Nearctic and Palearctic populations of the spruce
seed moth, Cydia strobilella L., have been considered taxonomically synonymous
since 1983, but more recent work revealing distinct sex pheromones for Canadian
and Swedish moths suggest that populations in the two regions belong to different
species. In order to test this hypothesis, we performed field trapping using different
pheromone lures at ten sites in North America, Europe and Asia, and reconstructed
phylogenetic relationships among trapped moths using mitochondrial (cytochrome
oxidase subunit I ) and nuclear (elongation factor 1 alpha) DNA sequence data.
Trapping data and tree topologies for both genes revealed distinct pherotypes in North
America and Eurasia. A genetically distinct population from China was investigated
further with respect to its sex pheromone. Electrophysiological data indicated that
Chinese females produce a deviant ratio of the sex pheromone components (dienic
acetates) compared to Swedish females. However, trapping experiments in both areas
revealed a similar broad response profile in males to a wide range of acetate ratios,
and these populations should be considered taxonomically synonymous. A previous
suggestion of an agonistic effect on the attraction of C. strobilella males in Sweden
when adding the corresponding alcohols to the binary acetate blend was also tested
in Sweden as well as in China, with no observed effect on attraction of males. In conclusion, our study demonstrates the great potential of using pheromone trapping
as a tool for identification and delimitation of taxa within cryptic species complexes.
Based on our data, Nearctic and Palearctic populations of C. strobilella should be
considered different species, and C. youngana Kearfott stat. rev. is resurrected here
as valid name for North American populations, which was the case before the revision
in 1983.
Department/s
Publishing year
2013
Language
English
Pages
305-315
Publication/Series
Systematic Entomology
Volume
38
Issue
2
Links
Document type
Journal article
Publisher
Wiley-Blackwell
Topic
- Zoology
- Biological Sciences
Status
Published
Project
- Pheromones for managing insects in spruce seed orchards
Research group
- Pheromone Group
ISBN/ISSN/Other
- ISSN: 1365-3113