Genetic and acoustic population structuring in the Okinawa least horseshoe bat: Are intercolony acoustic differences maintained by vertical maternal transmission?

Hajime Yoshino, Kyle N. Armstrong, Masako Izawa, Jun Yokoyama, Masakado Kawata

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The origin and meaning of echolocation call frequency variation within rhinolophid bats is not well understood despite an increasing number of allopatric and sympatric examples being documented. A bimodal distribution of mean regional call frequency within the Okinawa-jima Island population of Rhinolophus cornutus pumilus (Rhinolophidae) provided a unique opportunity to investigate geographic call frequency variation early in its development. Individual resting echolocation frequencies, partial mitochondrial DNA D-loop sequences and genotypes from six microsatellite loci were obtained from 288 individuals in 11 colonies across the entire length of the island, and nearby Kume-jima Island. Acoustic differences (5-8 kHz) observed between the north and south regions have been maintained despite evidence of sufficient nuclear gene flow across the middle of the island. Significant subdivision of maternally inherited D-loop haplotypes suggested a limitation of movement of females between regions, but not within the regions, and was evidence of female philopatry. These results support a 'maternal transmission' hypothesis whereby the difference in the constant frequency (CF) component between the regions is maintained by mother-offspring transmission of CF, the restricted dispersal of females between regions and small effective population size. We suggest that the mean 5-8 kHz call frequency difference between the regions might develop through random cultural drift.

Original languageEnglish
Pages (from-to)4978-4991
Number of pages14
JournalMolecular ecology
Volume17
Issue number23
DOIs
Publication statusPublished - 2008 Dec 1

Keywords

  • CF
  • Echolocation calls
  • Gene flow
  • Horseshoe bat
  • Population genetic structure
  • Within-island variation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

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