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Sökning: WFRF:(Mrazek Veronika)

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1.
  • Näsvall, Karin, et al. (författare)
  • Host plant diet affects growth and induces altered gene expression and microbiome composition in the wood white (Leptidea sinapis) butterfly
  • 2021
  • Ingår i: Molecular Ecology. - : Wiley. - 0962-1083 .- 1365-294X. ; 30:2, s. 499-516
  • Tidskriftsartikel (refereegranskat)abstract
    • In a time with decreasing biodiversity, especially among insects, a detailed understanding about specific resource utilization strategies is crucial. The physiological and behavioural responses to host switches in phytophagous insects are poorly understood. Earlier studies indicate that a host plant switch might be associated with distinctive molecular and physiological responses in different lineages. Expanding the assessment of such associations across Lepidoptera will reveal if there are general patterns in adaptive responses, or if each switch event is more of a unique character. We investigated host plant preference, fitness consequences, effects on expression profiles and gut microbiome composition in two common wood white (Leptidea sinapis) populations with different host plant preferences from the extremes of the species distribution area (Sweden and Catalonia). Our results show that female Catalonian wood whites lack preference for either host plant (Lotus corniculatus or L. dorycnium), while Swedish females laid significantly more eggs on L. corniculatus. Individuals from both populations reared on L. dorycnium had longer developmental times and smaller body size as adults. This indicates that both environmental and genetic factors determine the choice to use a specific host plant. Gene expression analysis revealed a more pronounced response to host plant in the Catalonian compared to the Swedish population. In addition, host plant treatment resulted in a significant shift in microbiome community structure in the Catalonian population. Together, this suggests that population specific plasticity associated with local conditions underlies host plant utilisation in wood whites.
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2.
  • Talla, Venkat, et al. (författare)
  • Whole genome re-sequencing uncovers significant population structure and low genetic diversity in the endangered clouded apollo (Parnasssius mnemosyne) in Sweden
  • 2023
  • Ingår i: Conservation Genetics. - : Springer. - 1566-0621 .- 1572-9737. ; 24, s. 305-314
  • Tidskriftsartikel (refereegranskat)abstract
    • The clouded apollo (Parnassius mnemosyne) used to have a wide distribution in Fennoscandia. Recent population declines have, however, led to regional extinctions and in Sweden it is currently one of the most endangered butterflies, confined to three geographically separated metapopulations: Blekinge, Roslagen and Vasternorrland. Especially the Blekinge population has declined dramatically and few imagines have been observed during recent census efforts (< 10 in some localities). The clouded apollo is subject to a species action plan which includes both habitat restorations and captive breeding to produce individuals for release and reintroductions. Here, we apply whole-genome resequencing of clouded apollo individuals collected in the three natural populations and the captive population in Sweden and apply population genomic approaches to get a better understanding of the genetic structure and levels of genetic diversity in the species. We find that the clouded apollo populations in the different geographic regions have similar, but comparatively low levels of genetic diversity and we find evidence for significant genetic differentiation between the northernmost population and the populations in southern Sweden. Additional analysis, including previously available mitochondrial data, unveil that a bi-directional re-colonization of Fennoscandia after the latest glacial maximum most likely is the explanation for the considerable differentiation between some Swedish populations. Finally, we find evidence for population sub-structure in one of the Swedish populations. The results provide insights into the genetic consequences of population size declines and fragmentation in general and provide important information for direct conservation actions for the clouded apollo in Sweden in particular.
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