School of Agriculture and Food Security, Jaramogi Oginga Odinga University Science and Technology (JOOUST), Bondo, Kenya.
International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya.
PLoS One. 2019 Sep 25;14(9):e0222941. doi: 10.1371/journal.pone.0222941. eCollection 2019.
Scapsipedus icipe Hugel and Tanga (Orthoptera: Gryllidae) is a newly described edible cricket species. Although, there is substantial interest in mass production of S. icipe for human food and animal feed, no information exists on the impact of temperature on their bionomics. Temperature-dependent development, survival, reproductive and life table parameters of S. icipe was generated and integrated into advanced Insect Life Cycle Modeling software to describe relative S. icipe population increase and spatial spread based on nine constant temperature conditions. We examined model predictions and implications for S. icipe potential distribution in Africa under current and future climate. These regions where entomophagy is widely practiced have distinctly different climates. Our results showed that S. icipe eggs were unable to hatch at 10 and 40°C, while emerged nymphs failed to complete development at 15°C. The developmental time of S. icipe was observed to decrease with increased in temperature. The lowest developmental threshold temperatures estimated using linear regressions was 14.3, 12.67 and 19.12°C and the thermal constants for development were 185.2, 1111.1- and 40.7-degree days (DD) for egg, nymph and pre-adult stages, respectively. The highest total fecundity (3416 individuals/female/generation), intrinsic rate of natural increase (0.075 days), net reproductive rate (1330.8 female/female/generation) and shortest doubling time (9.2 days) was recorded at 30°C. The regions predicted to be suitable by the model suggest that S. icipe is tolerant to a wider range of climatic conditions. Our findings provide for the first-time important information on the impact of temperature on the biology, establishment and spread of S. icipe across the Africa continent. The prospect of edible S. icipe production to become a new sector in food and feed industry is discussed.
伊西佩扁蟋 Hugel 和坦加（直翅目：蟋蟀科）是一种新描述的可食用蟋蟀物种。尽管人们对大规模生产 S. icipe 作为人类食品和动物饲料有浓厚的兴趣，但关于温度对其生物学特性的影响尚无信息。我们生成了 S. icipe 的温度依赖性发育、生存、繁殖和生命表参数，并将其整合到先进的昆虫生命周期建模软件中，以根据九个恒温条件描述相对 S. icipe 种群的增加和空间扩散。我们检查了模型预测及其对 S. icipe 在非洲潜在分布的影响，在当前和未来气候下。这些广泛实行昆虫食用的地区具有明显不同的气候。我们的研究结果表明，S. icipe 的卵在 10 和 40°C 下无法孵化，而孵化的若虫在 15°C 下无法完成发育。S. icipe 的发育时间随着温度的升高而缩短。使用线性回归估计的最低发育阈值温度分别为 14.3、12.67 和 19.12°C，卵、若虫和预成虫阶段的发育热常数分别为 185.2、1111.1-和 40.7 度日（DD）。在 30°C 时，总产卵量最高（3416 只/雌/代）、内禀增长率最高（0.075 天）、净生殖率最高（1330.8 只/雌/代）和最短倍增时间（9.2 天）。模型预测的适宜区域表明，S. icipe 对更广泛的气候条件具有耐受性。我们的研究结果首次提供了有关温度对 S. icipe 在非洲大陆的生物学、建立和扩散的影响的重要信息。讨论了可食用 S. icipe 生产成为食品和饲料行业新领域的前景。
