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Bactrocera dorsalis成虫の繁殖力と寿命に及ぼす熱効果とその改良された排卵モデル
Thermal effect on the fecundity and longevity of Bactrocera dorsalis adults and their improved oviposition model.
PMID: 32667946 DOI: 10.1371/journal.pone.0235910.
抄録
東洋果実蠅（Bactrocera dorsalis）は、様々な果樹作物に被害を与える破壊的な多食性害虫であり、現在その分布は世界的に拡大している。気温は昆虫の生存・発達・繁殖に影響を与え、個体群の動態や分布に影響を与える重要な生物学的要因である。本研究では、13℃から35℃までの様々な一定温度における成虫B. dorsalisの繁殖力、着床前・着床期間、寿命を調べた。雌の寿命は116.8日(18.8℃)から22.4日(34.9℃)であり，雌の1匹当たりの最大産卵数は28.1℃で1,684個であった。雌は16.7℃～34.9℃でしか産卵できず、着床前と着床期は温度によって異なっていた。雌の繁殖モデルは、1) Kim and Leeが開発した、繁殖モデル、年齢別生存モデル、年齢別累積着床率モデルからなる現行モデルと、2) 現行モデルの論理構造を変更して着床前を分離し、着床前段階を完全に終えた着床期の雌で着床を推定する二相OMの2つの着床モデルでモデル化した。その結果、現在のモデルよりも低温・高温でより現実的な出力が得られた。また、二相OMの有用性についても議論した。
The oriental fruit fly, Bactrocera dorsalis, is a destructive polyphagous pest that causes damage to various fruit crops, and their distribution is currently expanding worldwide. Temperature is an important abiotic factor that influences insect population dynamics and distribution by affecting their survival, development, and reproduction. We examined the fecundity, pre-oviposition and oviposition periods, and longevity of adult B. dorsalis at various constant temperatures ranging from13°C to 35°C. The longevity of female B. dorsalis ranged from 116.8 days (18.8°C) to 22.4 days (34.9°C), and the maximum fecundity per female was 1,684 eggs at 28.1°C. Females were only able to lay eggs at 16.7°C to 34.9°C, and both the pre-oviposition and oviposition periods were different depending on the temperature. We modeled female reproduction in two oviposition models (OMs): 1) the current model developed by Kim and Lee, an OM composed of a fecundity model, age-specific survival model, and age-specific cumulative oviposition rate model, and 2) a two-phase OM modified the logic structure of the current model by separating pre-oviposition, so that oviposition was estimated with the female in oviposition phase who had complete pre-oviposition phase. The results of the two-phase OM provided more realistic outputs at lower and higher temperatures than those of the current model. We discussed the usefulness of the two-phase OM for the reproduction of insects with long pre-oviposition periods.