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Degree of Dietary Specialization on Furanocoumarin-Containing Hostplants in a Newly Invasive Web Building Caterpillar

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Abstract

The genus Depressaria (Lepidoptera: Depressariidae) mostly comprises specialist herbivores with varying capacity for detoxification of defensive phytochemistry. Depressaria depressana, a Eurasian moth recently introduced into North America, is a family-level specialist of the Apiaceae, whose hosts include more than a dozen species in multiple tribes; Depressaria radiella is a super-specialist of Eurasian origin that feeds exclusively on species in the genera Pastinaca and Heracleum throughout its native and introduced range. In eastern North America, it feeds upon Pastinaca sativa, an invasive European species, and Heracleum maximum, a native species. We determined whether differences in furanocoumarin metabolism exist between D. depressana and two isolated populations of D. radiella, feeding exclusively on either P. sativa or H. maximum. We also compared gravimetric estimates of feeding efficiency to assess D. depressana larval performance on different diets. Both populations of D. radiella metabolized furanocoumarins at a greater rate than D. depressana. Although there was no difference in rates of metabolism of linear furanocoumarins in the two populations of D. radiella, individuals collected from H. maximum metabolized angular furanocoumarins more rapidly. The gravimetric assessments of feeding efficiencies revealed that D. depressana exhibited highest efficiencies consuming Daucus carota; moreover, this species survived to pupation consuming fruits of Zizia aurea, an apiaceous species native to North America. Our preliminary phylogenetic analysis, building on an earlier morphological analysis, incorporates mitochondrial cytochrome oxidase subunit 1 data from the BOLD database and revealed that the presence or absence of furanocoumarins is not a strong predictor of species-level evolution in Depressaria.

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Notes

  1. ECI = biomass gain/diet ingested. Biomass gain represents the converted dry weight of the larva at 0 h minus the dry weight of the larva at 24 h. Diet ingested represents the diet dry weights at 0 h minus diet dry weights at 24 h. ECD = biomass gain/(consumption – frass). Consumption represents converted dry weights of the diet at 0 h minus the dry weights of the food at 24 h. RGR = biomass gain/larval mass. RCR = consumption/larval mass. Larval mass represents the converted dry weights of the larvae at 0 h.

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Acknowledgements

We thank Jack Easley for assistance with field work in Illinois, Drs. Ling-Hsiu Liao and Bernarda Calla for help with midgut bioassay preparations, and Dr. James Whitfield for advice on phylogenetic analyses.

Funding

The work reported in this manuscript was supported by funds associated with the Swanlund Endowed Chair awarded to May Berenbaum.

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Contributions

The research was conceived by CAED and MRB, fieldwork was conducted by CAED, midgut bioassays and HPLC analysis were performed by CAED and WYW, gravimetric estimates of performance were calculated by CAED, phylogenetic analysis was conducted by CAED and AK, and the manuscript was drafted by CAED and revised by AK, WYW, and MRB.

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Correspondence to Charles A. E. Dean.

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Dean, C.A.E., Katz, A.D., Wu, WY. et al. Degree of Dietary Specialization on Furanocoumarin-Containing Hostplants in a Newly Invasive Web Building Caterpillar. J Chem Ecol 48, 850–866 (2022). https://doi.org/10.1007/s10886-022-01389-9

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  • DOI: https://doi.org/10.1007/s10886-022-01389-9

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