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Life cycle truncation in a trematode: does higher temperature indicate shorter host longevity?
Kristin K Herrmann1, Robert Poulin
1Department of Zoology, University of Otago, Dunedin, New Zealand. herkr385@student.otago.ac.nz
International Journal for Parasitology
|February 19, 2011
Summary
Parasitic worms can alter their life cycle to reproduce early when conditions are unfavorable, a strategy influenced by temperature and host tissue. This parasite plasticity enhances transmission success.
Area of Science:
- Parasitology
- Evolutionary Biology
- Ecology
Background:
- Trematodes typically have a three-host life cycle, facing transmission challenges.
- Progenesis, or precocious maturation, is an adaptation allowing parasites to reproduce in the second intermediate host, bypassing the definitive host.
Purpose of the Study:
- To investigate the effect of environmental stressors on facultative progenesis in *Stegodexamene anguillae*.
- To determine how fish host body condition and lifespan influence parasite life cycle truncation.
Main Methods:
- Experimental manipulation of water temperature and host diet to simulate environmental stressors.
- Analysis of progenesis rates in *Stegodexamene anguillae* within fish intermediate hosts under varying conditions.
- Examination of encystment site preference within the fish host.
Main Results:
- Higher water temperatures correlated with a greater proportion of worms exhibiting progenesis.
- Progenesis was more prevalent in worms encysted within the gonads or body cavity compared to other tissues.
- Environmental cues like temperature and encystment site appear to influence the parasite's developmental strategy.
Conclusions:
- Environmental factors significantly impact parasite developmental plasticity and transmission strategies.
- Parasites can adjust their life cycle, such as through progenesis, in response to perceived transmission opportunities.
- This study underscores the adaptability of parasite life cycles in response to environmental conditions.
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