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Energetics meets sexual conflict: the phenology of hibernation in Tasmanian echidnas


Nicol, SC and Morrow, GE and Harris, RL, Energetics meets sexual conflict: the phenology of hibernation in Tasmanian echidnas, Functional Ecology, 33, (11) pp. 2150-2160. ISSN 0269-8463 (2019) [Refereed Article]

Copyright Statement

2019 The Authors. Functional Ecology 2019 British Ecological Society

DOI: doi:10.1111/1365-2435.13447


  1. Echidnas are egg-laying mammals found across Australia, and in Tasmania they hibernate, resulting in a most unusual mating system: males enter hibernation in late summer-early autumn and arouse in late autumn-early winter to mate, although females are still hibernating. Groups of males compete for matings and both males and females mate with multiple partners. Females that mate early return to hibernation even when pregnant, and males continue to mate with pregnant females. We asked to what extent can the bizarre combination of behavioural and physiological features that characterize reproduction of Tasmanian echidnas be attributed to their phylogeny, and how much is a consequence of their ecology?
  2. To understand the interaction between energetics and the echidna mating system in determining the timing of echidna hibernation, we analysed data from an 18-year study of a wild population of Tasmanian echidnas(Tachyglossus aculeatus setosus)
  3. Males in best condition arouse earliest and seek out suitable females, and females that mate early in the mating season re-enter hibernation while pregnant.
  4. Competition between males drives early mating and while mating with males in the best condition could be advantageous for females and their young, egg-laying in winter is potentially disadvantageous, and post-mating hibernation by females is a means of delaying hatching of young until environmental conditions are more favourable. This post-mating hibernation by females is usually disrupted by males which mate with them although they are already pregnant.
  5. Comparisons with other echidna populations suggest that a decreased activity period due to hibernation has not increased male-male competition.
  6. Similar competition between groups of males for access to females is seen in chlamyphorid armadillos, which occupy a similar ecological niche to echidnas.

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Item Details

Item Type:Refereed Article
Keywords:life history, Monotreme, reproduction, sperm competition, torpor
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Comparative physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Nicol, SC (Associate Professor Stewart Nicol)
UTAS Author:Morrow, GE (Ms Gemma Morrow)
UTAS Author:Harris, RL (Miss Rachel Harris)
ID Code:152616
Year Published:2019
Web of Science® Times Cited:8
Deposited By:Zoology
Deposited On:2022-08-22
Last Modified:2022-11-10

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