Timeline / Data.gov — Environment Datasets

changed Source changed

A new raw object was archived. Both versions are preserved. 2114 line(s) added, 2180 line(s) removed.

Evidence

What changed derived

This diff is not evidence. It was produced by civic-memory.diff_engine 1.1.0 at 2026-10-01T06:25:15+00:00 by normalizing the two archived objects above. The objects are authoritative; this reading of them can be regenerated or deleted without loss. 2114 line(s) added, 2180 line(s) removed.

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- "description": "<p dir=\"ltr\">[Note 2026-08-31: File \"README_Tribolium_Density_MS_ADDENDUM.txt\" was added to dataset.]</p><p dir=\"ltr\">[Note 2026-08-12: Files \"Supplemental Table 1_adult number g larvae.xlsx\", \"Supplemental Table 2_flour loss glm.xlsx\", \"Supplemental Table 3_reproductive output contrasts.csv\", \"Supplemental Table 4_Pairwise_G-Test_DFU_adults.xlsx\", and \"Supplemental Table 5_VOC peak table.csv\" were added to dataset.]</p><p dir=\"ltr\"><i>Tribolium castaneum</i>, the red flour beetle, is a key pest of cereal grains and products that routinely infests food processing facilities. Such facilities represent dynamic environments comprising patches of resources of variable size and quality. To understand the influence of resource availability, insect density, and initial life stage on population regulation in <i>T. castaneum</i>, this study assessed the carrying capacity and population growth rates of <i>T. castaneum </i>populations<i> </i>kept for 20 weeks in a closed environment on four different amounts of diet at four starting population levels, then compared <i>T. castaneum</i> attraction to, reproductive output on, and the volatile profiles of previously-infested (e.g., conditioned) flour. Resource availability (e.g. the amount of flour) interacted with founding population density and life stage to influence <i>T. castaneum </i>population dynamics. In resource-limited patches, carrying capacity estimates were similar across founding densities, but the effect of founding population density on carrying capacity increased with flour availability. The opposite was observed for population growth rate, which tended to be more variable for small patches but stabilized as resource availability increased. Interestingly, both effects were reduced for populations founded as larvae compared to those founded as adults. The volatile profile of conditioned flour was also influenced by the interaction of patch size, density, and life stage. The relative abundance of 1-pentadecene and benzoquinones tended to be reduced in the volatile profiles of large patches, whereas 4,8-dimethyldecanal comprised a higher proportion of the total volatile emissions. Conditioned flour from large patches tended to be more attractive to <i>T. castaneum </i>adults, although this effect decreased as founding density increased. By contrast, when populations were founded as larvae, the volatile profiles of <i>T. castaneum </i>attraction to, and <i>T. castaneum </i>fecundity on conditioned flours were similar. These findings expand our understanding of how resource limitation and density-dependent effects influence <i>T. castaneum </i>population regulation and behavior, with implications for long-term trap monitoring and population thresholds in stored products.</p><p dir=\"ltr\">Supplemental Tables are included in the data files and referenced in the published manuscript.</p>",
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+ "description": "<p dir=\"ltr\">[Note 2026-08-31: File \"README_Tribolium_Density_MS_ADDENDUM.txt\" was added to dataset.]</p><p dir=\"ltr\">[Note 2026-08-12: Files \"Supplemental Table 1_adult number g larvae.xlsx\", \"Supplemental Table 2_flour loss glm.xlsx\", \"Supplemental Table 3_reproductive output contrasts.csv\", \"Supplemental Table 4_Pairwise_G-Test_DFU_adults.xlsx\", and \"Supplemental Table 5_VOC peak table.csv\" were added to dataset.]</p><p dir=\"ltr\"><i>Tribolium castaneum</i>, the red flour beetle, is a key pest of cereal grains and products that routinely infests food processing facilities. Such facilities represent dynamic environments comprising patches of resources of variable size and quality. To understand the influence of resource availability, insect density, and initial life stage on population regulation in <i>T. castaneum</i>, this study assessed the carrying capacity and population growth rates of <i>T. castaneum </i>populations<i> </i>kept for 20 weeks in a closed environment on four different amounts of diet at four starting population levels, then compared <i>T. castaneum</i> attraction to, reproductive output on, and the volatile profiles of previously-infested (e.g., conditioned) flour. Resource availability (e.g. the amount of flour) interacted with founding population density and life stage to influence <i>T. castaneum </i>population dynamics. In resource-limited patches, carrying capacity estimates were similar across founding densities, but the effect of founding population density on carrying capacity increased with flour availability. The opposite was observed for population growth rate, which tended to be more variable for small patches but stabilized as resource availability increased. Interestingly, both effects were reduced for populations founded as larvae compared to those founded as adults. The volatile profile of conditioned flour was also influenced by the interaction of patch size, density, and life stage. The relative abundance of 1-pentadecene and benzoquinones tended to be reduced in the volatile profiles of large patches, whereas 4,8-dimethyldecanal compri