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Conservation Acquisition and Maturation of Gut and Bladder Symbioses in Hirudo Verbana
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Conservation Acquisition and Maturation of Gut and Bladder Symbioses in Hirudo Verbana
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Dissertation
Conservation Acquisition and Maturation of Gut and Bladder Symbioses in Hirudo Verbana
2019
Overview
The medicinal leech is a developing experimental model of gut symbioses. Aeromonas veronii and Mucinivorans hirudinis are core members of the gut microbial community in Hirudo verbana and may aid the leech in digesting the blood meal, preserving the blood meal, and keeping invading bacteria from colonizing the gut. The bladders of H. verbana contain an entirely different microbial consortium. The scientific interest in this symbiosis is currently due to its simple nature and the extreme dietary habits of the leech. In order to increase the usefulness of this model, a more sophisticated understanding of processes by which the microbiome is acquired and develops is necessary. In my dissertation I have compared the gut and bladder microbiomes of H. verbana to that of Macrobdella decora (the North American medicinal leech) in order to determine the conservation of symbionts. I have additionally examined the potential for horizontal and vertical transmission of gut and bladder symbionts to hatchling and juvenile H. verbana. With such information, future researchers will be able to draw parallels between processes occurring in the leech to those occurring in other organisms. A more detailed understanding of processes conserved or lost between symbiotic partners will lead to a better understanding of processes required for colonization and persistence across a wide range of animals.
