The pattern of ovulation in Ansell's mole-rat

Phylogenetic or ecological constraints?

N. C. Bennett, J. van Sandwyk, H. Lutermann

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The distribution of ovulation patterns and penile ornamentation in mammals is thought to be shaped by sexual selection. Alternatively, ovulation patterns have been linked to factors such as phylogeny, social system and ecological constraints but no conclusive pattern has emerged. African mole-rats exhibit a unique range of social organizations and experience diverse ecological conditions (i.e. rainfall patterns), with various species exhibiting either induced or spontaneous ovulation in addition to a corresponding variation of penile ornamentation. Investigations of members of this family conducted so far do not allow conclusions to be drawn about the importance of phylogenetic versus ecological constraints for the evolution of ovulation patterns because all species of the genus Cryptomys studied occur in mesic habitats and exhibit induced ovulation. In contrast, the one representative of the genus Fukomys is a spontaneous ovulator that occurs in arid habitats. The current study aimed to elucidate the factors creating the observed ovulation pattern by using a species within a genus for which so far only spontaneous ovulation has been recorded, but unlike the other species with known ovulation mechanisms of this genus, it occurs in a mesic environment. Previously, non-reproductive Ansell's mole-rat Fukomys anselli females were housed individually for a period of 6 weeks before being housed either alone, in chemical or physical contact with a male. Progesterone profiles generated from urine samples collected throughout the study did not differ significantly either before or after the pairing or between the experimental groups, suggesting that they ovulate spontaneously. This was supported by the lack of penile ornamentation found in males of this species. The results suggest that phylogenetic rather than ecological constraints determine the ovulation patterns observed in social bathyergids.

Original languageEnglish
Pages (from-to)66-73
Number of pages8
JournalJournal of Zoology
Volume281
Issue number1
DOIs
Publication statusPublished - May 2010
Externally publishedYes

Fingerprint

mole rats
ovulation
ornamentation
phylogenetics
phylogeny
social organization
habitat
sexual selection
urine
Cryptomys
mammal
rainfall
social structure
habitats
progesterone
mammals
rain

Keywords

  • Bathyergidae
  • Penile ornamentation
  • Progesterone
  • Spontaneous ovulation

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics

Cite this

The pattern of ovulation in Ansell's mole-rat : Phylogenetic or ecological constraints? / Bennett, N. C.; van Sandwyk, J.; Lutermann, H.

In: Journal of Zoology, Vol. 281, No. 1, 05.2010, p. 66-73.

Research output: Contribution to journalArticle

Bennett, N. C. ; van Sandwyk, J. ; Lutermann, H. / The pattern of ovulation in Ansell's mole-rat : Phylogenetic or ecological constraints?. In: Journal of Zoology. 2010 ; Vol. 281, No. 1. pp. 66-73.
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