Variation in female reproductive tract morphology across the reproductive cycle in the zebra finch

Laura L. Hurley (Corresponding author), Ondi L. Crino, M. Rowe, Simon C. Griffith

Research output: Contribution to journal/periodicalArticleScientificpeer-review

20 Downloads (Pure)

Abstract

Background
In seasonally breeding birds, the reproductive tract undergoes a dramatic circannual cycle of recrudescence and regression, with oviduct size increasing 5–220 fold from the non-breeding to the breeding state. Opportunistically breeding birds can produce multiple clutches sequentially across an extended period in response primarily to environmental rather than seasonal cues. In the zebra finch, it has been shown that there is a significant reduction in gonadal morphology in non-breeding females. However, the scale of recrudescence and regression of reproductive tissue within a single breeding cycle is unknown and yet important to understand the cost of breeding, and the physiological readiness to breed in such flexible breeders.

Methods
We examined the reproductive tissue of breeding female zebra finches at six stages in the nesting cycle from pre-breeding to fledging offspring. We quantified the wet mass of the oviduct, the volume of the largest pre-ovulatory follicle, and the total number of pre-ovulatory follicles present on the ovary.

Results
Measures of the female reproductive tract were highest during nesting and laying stages and declined significantly in the later stages of the breeding cycle. Importantly, we found that the mass of reproductive tissue changes as much across a single reproductive event as that previously characterized between birds categorized as breeding and non-breeding. However, the regression of the ovary is less dramatic than that seen in seasonal breeders. This could reflect low-level maintenance of reproductive tissues in opportunistic breeders, but needs to be confirmed in wild non-breeding birds.
Original languageEnglish
Article number10195
JournalPeerJ
Early online date2020
DOIs
Publication statusPublished - 11 Nov 2020

Keywords

  • Plan_S-Compliant_OA
  • international
  • Finch
  • Opportunistic breeder
  • Ovarian development
  • Oviduct
  • Reproduction

Fingerprint

Dive into the research topics of 'Variation in female reproductive tract morphology across the reproductive cycle in the zebra finch'. Together they form a unique fingerprint.

Cite this