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Differences in constitutive innate immunity between divergent Australian marsupials
Rebecca Odewahn1, Belinda R Wright1, Gábor Á Czirják2
1Sydney School of Veterinary Science, Faculty of Science, University of Sydney, NSW, Australia.
Wildlife immunity is crucial for conservation and One Health. This study found that brushtail possums and kangaroos have stronger bacterial killing ability than ringtail possums and koalas, linked to diet and body size.
Area of Science:
- Comparative immunology
- Wildlife ecology
- Evolutionary biology
Background:
- Innate immunity is vital for wildlife health and conservation.
- Life history strategies can influence immune function across species.
- Understanding marsupial immunity provides insights into vertebrate immune systems.
Purpose of the Study:
- To investigate serum bacterial killing ability (BKA) across five marsupial species.
- To explore the influence of life history, diet, and body size on marsupial BKA.
- To establish a foundation for eco-evolutionary studies of marsupial immunity.
Main Methods:
- Measured serum bacterial killing ability (BKA) in five marsupial species.
- Analyzed BKA in relation to species, diet, body size, social structure, phylogeny, and captivity status.
- Examined the effect of sex and disease status on BKA in koalas.
Main Results:
- Significant variation in BKA was observed among the five marsupial species.
- Brushtail possums and eastern grey kangaroos exhibited the highest BKA.
- Ringtail possums and koalas showed the lowest BKA, associated with diet and body size, independent of phylogeny or captivity.
Conclusions:
- Marsupial BKA varies significantly and is associated with ecological factors like diet and body size.
- These findings highlight the eco-evolutionary drivers of innate immunity in marsupials.
- Further research is needed to explore wild versus captive koala immunity and adaptive immunity interactions.
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