Microbial vectoring capacity by internal‐ and external‐infesting stored product insects after varying dispersal periods between novel food patches: An underestimated risk.

Autor: Ponce, Marco A., Maille, Jacqueline M., Stoll, Ian, James, Avery, Bruce, Alexander, Kim, Tania N., Scully, Erin D., Morrison, William R.
Předmět:
Zdroj: Ecology & Evolution (20457758); Jun2024, Vol. 14 Issue 6, p1-16, 16p
Abstrakt: Understanding the ability of internal‐ and external‐infesting stored product insects to vector microbes is important for estimating the relative risk that insects pose to postharvest commodities as they move between habitat patches and in the landscape. Thus, the aim of the current study was to evaluate and compare the microbial growth in novel food patches at different dispersal periods by different populations of Sitophilus oryzae (e.g., internal‐infesting) and Lasioderma serricorne (e.g., external‐infesting). Adults of both species collected from laboratory colonies or field‐captured populations were either placed immediately in a novel food patch, or given a dispersal period of 24 or 72 h in a sterilized environment before entering a surrogate food patch. Vectored microbes in new food patches were imaged after 3 or 5 days of foraging, and microbial growth was processed using ImageJ while fungal species were identified through sequencing the ITS4/5 ribosomal subunit. We found that increasing dispersal time resulted in multiple‐fold reductions in microbial growth surrogate food patches by L. serricorne but not S. oryzae. This was likely attributable to higher mobility by S. oryzae than L. serricorne. A total of 20 morphospecies were identified from 13 genera among the 59 sequences, with a total of 23% and 16% classified as Aspergillus and Penicillium spp. Our data suggest that there is a persistent risk of microbial contamination by both species, which has important food safety implications at food facilities. The study investigated how Sitophilus oryzae and Lasioderma serricorne, two types of stored product insects (internal‐ and external‐infesting), affect microbial growth in new food patches over varying dispersal periods. We found that longer dispersal times led to a significant reduction in microbial growth in food patches for L. serricorne but not for S. oryzae, likely due to differences in mobility between the two species. This suggests an ongoing risk of microbial contamination from both insect types, with implications for food safety in storage facilities. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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