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Updated: Feb 14, 2026
07:37
Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
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Good Daphnia parents do not control the offspring microbiome
1Department of Entomology and Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA.
The Journal of Animal Ecology
|February 15, 2018
Summary
Aquatic crustaceans like Daphnia acquire essential bacteria from their environment, not solely from parents. This environmental acquisition of microbes aids their development after dormancy.
Area of Science:
- Ecology
- Microbiology
- Evolutionary Biology
Background:
- Animals host diverse microorganisms, with transmission routes (vertical vs. horizontal) influencing host-microbe interactions.
- Vertical transmission is theorized to yield more beneficial symbionts, while horizontal acquisition is seen as more opportunistic.
Purpose of the Study:
- To investigate the origin of bacteria crucial for the development of aquatic crustaceans (Daphnia) after a dormant period.
- To understand how host-microbe associations are established following dormancy in Daphnia.
Main Methods:
- Investigated the source of bacteria essential for Daphnia growth and development to reproductive maturity.
- Examined microbial communities associated with Daphnia eggs and their protective capsules.
Main Results:
- While some bacteria can be vertically transmitted within Daphnia egg capsules, key beneficial microbes are found on the capsule's external surface.
- These performance-enhancing bacteria are of likely environmental origin, acquired after the diapause (dormancy) period.
Conclusions:
- Daphnia's reliance on environmentally acquired bacteria, rather than solely vertically transmitted ones, may be an adaptation to differing parental and offspring environments.
- This highlights that some animals depend on taxonomically diverse microbes from their surroundings, contrasting with those reliant on specific, coevolved symbionts.
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