Microevolution, low clonal diversity and genetic affinities of parthenogenetic sitobion aphids in New Zealand

Alexandra Wilson, P. Sunnucks, D. F. Hales

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

In sharp contrast to their southeast Asian and European counterparts, Sitobion miscanthi and S. near fragariae aphids in Australia exhibit a complete absence of sexual reproduction. This demands an explanation within the context of the evolution and maintenance of sex and parthenogenesis. Accordingly, we executed a genetic analysis of the two species in neighbouring New Zealand. Microsatellites and single-stranded conformation polymorphism/sequence analysis of the nuclear gene elongation factor 1α were used to identify aphid clones and confirm species identification, respectively. Karyotypic variation was also investigated. The New Zealand fauna showed few (nonrecombining) genotypes and appears to have received migrants from both Australia and Asia. Other genotypes have apparently arisen in situ in New Zealand, exhibiting stepwise mutation of microsatellite alleles and also karyotypic change. Thus, these data represent rare evidence of evolution within wild-living parthenogenetic lineages. Karyotypic changes appear to occur at a rate even greater than that of microsatellite evolution. Strong geographical partitioning of genotypes/karyotypes was found, with certain ones predominating over large areas. These data suggest that clonal selection could be important in the distribution and patterning of genetic variation. We present a model to explain the genetic patterns, with particular reference to the absence of sexual reproduction in Sitobion aphids in New Zealand and Australia.

Original languageEnglish
Pages (from-to)1655-1666
Number of pages12
JournalMolecular Ecology
Volume8
Issue number10
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

Fingerprint

Sitobion
Aphids
aphid
New Zealand
Microsatellite Repeats
Aphidoidea
genotype
sexual reproduction
microsatellite repeats
Genotype
Peptide Elongation Factor 1
Reproduction
parthenogenesis
Miscanthus
Fragaria
single-stranded conformational polymorphism
karyotype
Parthenogenesis
genetic analysis
Polymorphism

Keywords

  • Aphid
  • Chromosomal evolution
  • Microsatellite
  • Parthenogenesis
  • SSCP

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Ecology

Cite this

Microevolution, low clonal diversity and genetic affinities of parthenogenetic sitobion aphids in New Zealand. / Wilson, Alexandra; Sunnucks, P.; Hales, D. F.

In: Molecular Ecology, Vol. 8, No. 10, 01.01.1999, p. 1655-1666.

Research output: Contribution to journalArticle

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