Echidna microbiome changes while mums nurse puggle
Research from the University of 亚洲彩票官网 shows microbial communities in echidna pseudo-pouches undergo dramatic changes while the animal is lactating, which could help in creating an environment for their young, known as puggles, to thrive.
Credit: Ken Hurley.
Echidnas are monotremes, which are the only mammals that lay eggs. The early developmental stage at which they hatch from their egg means that the puggles lack a functioning immune system.
鈥淲e know the reproductive microbiome is important to infant health, including for humans, but little is known about how it functions in egg-laying monotremes,鈥 says the University of 亚洲彩票官网鈥檚 Isabella Wilson, whose study was published in .
鈥淚nstead of picking up vaginal microbiota during delivery like other mammals, echidnas are shielded by the eggshell and don鈥檛 come into direct contact with the cloaca.鈥
The first few weeks of life are critical for puggles, as they hatch at an early developmental stage. They continue to grow in the pseudo-pouch, which is created from the contraction of abdominal muscles and disappears when a female is not nursing.
鈥淲e investigated changes in the echidna pseudo-pouch microbiota during different stages of the reproductive cycle and found that during lactation pseudo-pouch microbial communities show significant differences in composition compared with samples taken outside of breeding season or during courtship and mating,鈥 Wilson says.
鈥淭his suggests that the echidna pseudo-pouch environment changes during lactation to accommodate young that lack a functional adaptive immune system.鈥
The way puggles suckle may contribute to the shift in microbes.
An echidna puggle. Credit: Peggy Rismiller and Michael McKelvey.
鈥淎nother unique aspect of echidna biology is that they lack nipples. Instead of suckling like other species, the puggle rubs its beak against a part of the pseudo-pouch called the milk patch, causing milk to come out of the skin, sort of like a sweat or oil gland,鈥 says Wilson.
鈥淲e think that compounds within the milk and from the skin probably contribute to the changes we see in the pseudo-pouch microbiota during lactation.鈥
Echidnas are commonly held in zoos in Australia and around the world. Previous work from the same research group showed big differences in the gut microbiome between echidnas in zoos and in the wild.
鈥淲e were surprised to find no major difference in the pseudo-pouch between zoo-managed and wild animals, which suggests to us that the milk, rather than external environmental factors like captivity, is what primarily shapes the bacterial landscape of the pseudo-pouch,鈥 Wilson says.
鈥淔or conservation in the wild, and in breeding programs, we need to learn more about the bacteria found in echidna pseudo-pouches and better understand how these affect echidna health.鈥
Media contact:
Isabella Rose Wilson, PhD Candidate, School of Biological Sciences, University of 亚洲彩票官网. Phone: +61 0413 538 112 Email: isabella.wilson@adelaide.edu.au
Professor Frank Gr眉tzner, School of Biological Sciences, University of 亚洲彩票官网. Phone: +61 8 8313 4812 Email: frank.grutzner@adelaide.edu.au
Johnny von Einem, Senior Media Officer, University of 亚洲彩票官网. Phone: +61 0481 688 436, Email: johnny.voneinem@adelaide.edu.au