Unraveling genetic load dynamics during biological invasion: insights from two invasive insect species
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Abstract
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Adult HA were sampled at four sites: two in the native area (Russia [Siberia] and China)
The results certainly seem to suggest these native populations might be bottlenecked too. Is there any indication on how central these sampling locations are to the species native range? Is it possible that the range edge was sampled?
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In all populations studied and for each species, derived alleles were mostly rare (with frequencies below 0.1)
Site-frequency spectrum plots per population+mutation would quantitatively demonstrate these patterns without the need to arbitrarily bin allele frequency.
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and a negative correlation between t
This correlation is based on two autocorrelated measures (as theta pi synonymous is measured in both the X and Y axis), so it should be interpreted with caution.
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crop pest (DVV)
I wonder how much the fact that DVV is a crop pest might influence the results for this species. It would be easy for me to imagine that most DVV populations (native and invasive) have experienced agriculture related bottlenecks and/or population expansions. Pests like corn rootworm have repeatedly adapted to the use of pesticides/GM crops a process which often involved a bottleneck (followed by expansion) and may cause similar effects on the evolution of load in native/invasive populations. Data on the population ecology or local agricultural practices (and history of pest load) may be helpful in figuring if the selective landscape of these populations could have such effects
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