Predator-Induced Morphology in a Freshwater Snail
Author Information
Author(s): Brönmark Christer, Lakowitz Thomas, Hollander Johan
Primary Institution: Aquatic Ecology Unit, Department of Biology, University of Lund, Lund, Sweden
Hypothesis
Snails from ponds with molluscivorous fish would have a more rotund shell shape as this is known to reduce predation efficiency from shell-crushing predators.
Conclusion
The study found that shell shape in freshwater snails varies significantly based on the presence of predators, indicating both genetic and phenotypic plasticity in response to predation.
Supporting Evidence
- Snails from fish-free ponds had a narrow shell, while those from ponds with fish had rounder shells.
- The common garden experiment showed that snails responded similarly to predator cues regardless of their pond of origin.
- Significant differences in shell shape were found among populations within each pond category.
Takeaway
Snails change their shell shape depending on whether there are fish that eat them, helping them survive better.
Methodology
The study involved a field survey of 22 ponds and a common garden experiment to analyze shell shape in response to predator cues.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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