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7 results for “bivoltine”
Parasitism rate differs between herbivore generations in the univoltine, but not bivoltine, range
<p>With climate change, plant-feeding insects might increase their number of annual generations (voltinism). However, to what degree the emergence of a new herbivore generation affects the parasitism rate has not been explored. We performed a field experiment to test whether the parasitism rate differs between the first and the second generation of a specialist leaf miner (<em>Tischeria</em> <em>ekebladella</em>), both in the naturally univoltine and bivoltine parts of the leaf miner's distribution. We found an interactive effect between herbivore generation and geographical range on the parasitism rate. The parasitism rate was higher in the first compared to the second host generation in the part of the range that is naturally univoltine, whereas it did not differ between generations in the bivoltine range. Our experiment highlights that shifts in herbivore voltinism might release top-down control, with major consequences for natural and applied systems.</p>
Parasitism rate differs between herbivore generations in the univoltine, but not bivoltine, range
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Variation in gut microbial communities of Chilo suppressalis in the typical bivoltine areas of northern China
<p>During long-term coevolution, the gut microbiota is an essential part of the host insect's growth and development, digestion and detoxification processes. The rice stem borer (RSB), <em>Chilo suppressalis</em>, is one of the most destructive rice pests and has caused serious economic losses to major rice-producing areas of China. However, little is known about the gut microbiota of this moth linked to adaptability to different geographical environments. We investigated the gut microbiota of RSB populations collected from five sites in the typical areas of northern China using 16S rDNA gene sequencing on an Illumina MiSeq platform. In total, 453,853,707 reads and 1650 operational taxonomic units (OTUs) were obtained in 25 RSB samples. A total of 697 bacterial genera belonging to 30 phyla were detected, and Proteobacteria and Firmicutes were the most dominant phyla. Richness and alpha-diversity metrics revealed variation in the RSB gut bacteria among RSB populations. The highest bacterial diversity was found in Beizhen, western Liaoning Province. Principal coordinates analysis (PCoA) and clustering analysis (UPGMA) showed that the gut microbial community structure in western Liaoning differs greatly from that in other regions. LDA effect size (LEfSe) analysis indicated that the microbial groups had significant effects among the middle, northern and western regions. PICRUSt analysis demonstrated that microbial functions closely associated with the gut microbiome were membrane transport, amino acid metabolism and carbohydrate metabolism. In addition, redundancy analysis (RDA) of microbial community composition revealed the average annual temperature, average annual relative humidity and cumulative annual precipitation to be a significant source of variation in patterns of gut microbial abundance. Accordingly, our study provided important insights into the investigation of insect-bacteria symbioses and evaluated gut microorganisms as biocontrol agents for this pest and other agricultural lepidopterans.</p>
Variation in gut microbial communities of Chilo suppressalis in the typical bivoltine areas of northern China
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Data from: Mountain pine beetle seasonal timing and constraints to bivoltinism: a comment on Mitton and Ferrenberg (2012)
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Data from: Field studies demonstrate bivoltinism in the mountain pine beetle (a reply to Bentz and Powell)
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Data from: Field studies demonstrate bivoltinism in the mountain pine beetle (a reply to Bentz and Powell)
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.