Infection success of Echinoparyphium aconiatum (Trematoda) in its snail host under high temperature: role of host resistance
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Leicht, K., & Seppälä, O. (2014). Infection success of Echinoparyphium aconiatum (Trematoda) in its snail host under high temperature: role of host resistance. Parasites & Vectors, 7(192). https://doi.org/10.1186/1756-3305-7-192
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Parasites & VectorsDate
2014Copyright
© 2014 Leicht and Seppälä; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
Background: Extreme weather events such as summer heat waves become more frequent owing to global climate
change and are predicted to alter disease dynamics. This is because high temperatures can reduce host immune
function. Predicting the impact of climate change on host-parasite interactions is, however, difficult as temperature
may also affect parasite infective stages and other host characteristics determining the outcome of interaction.
Methods: Two experiments were conducted to investigate these phenomena in a Lymnaea stagnalis–Echinoparyphium
aconiatum (Trematoda) interaction. In the first experiment, the effects of exposure of snails to experimental heat waves
[maintenance at 25°C vs. 15°C (control)] with different durations (3 days, 7 days) on the infection success of parasite
cercariae was examined. In the second experiment, the infection success was examined under similar conditions, while
controlling for the possible temperature effects on cercariae and at least partly also for host physiological changes that
take place rapidly compared to alterations in immune function (exposure to cercariae at intermediate 20°C).
Results: In the first experiment, increased infection success at 25°C was found independently of the duration of the
heat wave. In the second experiment, increased infection success was found only in snails maintained at 25°C for
7 days, a treatment in which snail immune defence is known to be impaired.
Conclusions: These results suggest that the effects of host resistance in determining overall parasite infection success
can be overridden by effects of temperature on parasite transmission stages and/or alterations in other host traits than
immune defence.
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Except where otherwise noted, this item's license is described as © 2014 Leicht and Seppälä; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
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