Impact of Floods on Marble Trout Genetics
Author Information
Author(s): Pujolar José Martin, Vincenzi Simone, Zane Lorenzo, Jesensek Dusan, De Leo Giulio A., Crivelli Alain J.
Primary Institution: Department of Biology, University of Padova, Padova, Italy
Hypothesis
How do recurrent floods affect the genetic composition of marble trout populations in Slovenia?
Conclusion
Recurrent floods have led to extreme genetic differentiation and low genetic diversity in marble trout populations.
Supporting Evidence
- Extreme genetic differentiation was found among marble trout populations with a global F_ST of 0.716.
- All locations showed low levels of genetic diversity with heterozygosities below 0.25.
- Bottleneck episodes were inferred for all samples with a reduction in population size of 3–4 orders of magnitude.
- Moderate drops in genetic diversity were observed post-flood, but comparisons were statistically non-significant.
- Significant differences in genetic composition were found at Studenc after flood events.
Takeaway
Floods can hurt fish populations by killing many of them and changing their genes, making it hard for them to survive in the future.
Methodology
Microsatellite data were used to analyze genetic diversity and differentiation among marble trout populations before and after flood events.
Potential Biases
There may be biases due to the reliance on specific sampling locations and the potential for unobserved population dynamics.
Limitations
The study is limited by the small effective population sizes and the potential for non-representative sampling.
Participant Demographics
The study focused on isolated populations of marble trout in Slovenian streams.
Statistical Information
P-Value
p<0.001
Confidence Interval
1–396 individuals
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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