Demography of Rusty Grain Beetle in Stored Bulk Wheat: Part I, Population Dynamics at Different Temperatures and Grain Bulk Sizes
| Autor: | Digvir S. Jayas, Hao Zhang, Paul G. Fields, Peian Tang, Fuji Jian, Noel D.G. White |
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| Rok vydání: | 2018 |
| Předmět: |
Male
0106 biological sciences Population Dynamics Population medicine.disease_cause 010603 evolutionary biology 01 natural sciences Population density Animal science Food Parasitology Infestation medicine Animals education Triticum Ecology Evolution Behavior and Systematics Population Density 2. Zero hunger education.field_of_study Ecology biology Cryptolestes ferrugineus Bulk storage Temperature food and beverages Manitoba biology.organism_classification Coleoptera 010602 entomology Volume (thermodynamics) Insect Science Cucujidae Female |
| Zdroj: | Environmental Entomology. 47:244-255 |
| ISSN: | 1938-2936 0046-225X |
| DOI: | 10.1093/ee/nvy019 |
| Popis: | Population dynamics of rusty grain beetle, Cryptolestes ferrugineus (Stephens; Coleoptera: Cucujidae), was studied using different sizes of grain bulks (patches) at various temperatures. The temperatures were 21, 25, 30, 35°C, T-decrease (30°C in the first 4 wk and then decreased 1°C /wk), and T-increase (21°C in the first 2 wk and then increased 1°C /wk). Number of adults and offspring and infested wheat kernels were counted every 4 wk up to 24 wk (31 wk for the T-decrease). The grain bulk patches used were: small (50 ml inner volume, 0.03 kg wheat), medium (2.6 liters inner volume, 2 kg wheat), and large (18 liters inner volume, 14 kg wheat). All of the correlation coefficients between the insect numbers and kernel infestation percentage were ≥0.63. Two types of the population dynamic curves were observed: insect number or density continually increased with time during the entire experiment, or there was a rise then a fall in insect number or density over time, giving a peak number or density. The peak insect density was approximately 400 to 500 adults/kg of wheat for all patches at 30°C or lower. At 35°C, the peak densities of live adults were 3,956 ± 630, 2,094 ± 34, and 1,003 ± 70 adults/kg of wheat in small, medium, and large patches, respectively. Patch size influenced insect population dynamics at 35°C. Insect number inside large patch was more dependent on the previous insect number than that inside small patches. |
| Databáze: | OpenAIRE |
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