I analysed my samples for isolation-by-distance using a mantel test in Adegenet package. I am not sure if the histogram below shows that my samples has a clear isolation by distance pattern.

Below is the summary of result from the adegenet.

Summary of results

Monte-Carlo test

Call: mantel.randtest(m1 = Dgen, m2 = Dgeo)

Observation: 0.1486482

Based on 999 replicates

Simulated p-value: 0.009

Alternative hypothesis: greater

Std.Obs: 3.3053629175

Expectation: 0.0009153189

Variance: 0.0019976358

Also, for the second plot I am not really sure if it is a normal result and I am a bit confused how to interpret it. I hope anyone can help me interpret these plots.

Thank you so much.

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