Thuy Tien T. Lindsay, Marcia M. Hagen, Joyce N. Knoblett, Joseph P. Rinehart, Karen M. Kapheim, James P. Strange
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We tested the effects of FTR on gyne survival and post-cold storage lipid content in three species used for commercial pollination in North America: <i>B. vosnesenskii</i>, <i>B. huntii</i> and <i>B. impatiens</i>. We further assessed how additional factors influence cold storage survival, including gyne body weight, body size and colony age. Survival responses varied among species. <i>Bombus vosnesenskii</i> and <i>B. huntii</i> had a lower survival rate in FTR compared to CLT, but <i>B. impatiens</i> gynes had a significantly higher survival rate in FTR. We did not observe significant effects of FTR on lipid stores for any species, but survival increased with an increasing initial weight prior to cold storage. Moreover, gynes produced later in the colony life cycle had lower body weight and decreased survival compared to early emerging gynes. 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引用次数: 0
摘要
熊蜂是温室作物的主要商业授粉者,要管理好它们,就必须深入了解熊蜂的生命周期。然而,人们对其生命周期的某些方面还不完全了解。一旦交配,成年雌蜂可在恒定低温(CLT)下短期储存。然而,某些物种在恒定低温条件下的存活率很低,尤其是当储存时间超过一个月时。为了解决这个问题,我们测试了一个假设:与在恒定低温条件下储存的雌蜂相比,在波动温度条件(FTR)下储存的雌蜂存活率更高。具体来说,FTR的基线温度为2°C,每天波动到20°C,而CLT的基线温度为2°C,没有升温脉冲。我们在北美用于商业授粉的三个物种中测试了FTR对胚珠存活率和冷藏后脂质含量的影响:B. vosnesenskii、B. huntii 和 B. impatiens。我们进一步评估了影响冷藏存活率的其他因素,包括幼虫体重、体型和群落年龄。不同物种对存活率的反应各不相同。与 CLT 相比,Bombus vosnesenskii 和 B. huntii 在 FTR 中的存活率较低,但 B. impatiens 雌虫在 FTR 中的存活率明显较高。我们没有观察到低温冷藏对任何物种的脂质储存有明显影响,但存活率随着冷藏前初始重量的增加而增加。此外,与早期出现的雌蜂相比,在蜂群生命周期后期产生的雌蜂体重较轻,存活率较低。我们的研究有助于深入了解冷藏条件如何与蜂群和雌蜂的特征相互作用,从而影响人工越冬的存活率。我们的研究结果具有经济价值,可用于改善商业饲养和保护性饲养濒危庞巴迪物种。
Assessing the effects of cold storage regimes of North American Bombus Gynes
Bumble bees are the primary commercial pollinators for greenhouse-grown crops and managing them requires insight into the Bombus life cycle. However, some aspects of the life cycle are not fully understood. Once mated, adult Bombus gynes can be stored for a short term at a constant low temperature (CLT). However, survival rates for some species are low during CLT, particularly when storage periods exceed a month. To address this, we tested the hypothesis that Bombus gynes stored in a fluctuating thermal regime (FTR) have increased survival compared to gynes stored in CLT. Specifically, the FTR had a baseline temperature of 2°C, with a daily fluctuation to 20°C relative to the CLT of 2°C with no warming pulse. We tested the effects of FTR on gyne survival and post-cold storage lipid content in three species used for commercial pollination in North America: B. vosnesenskii, B. huntii and B. impatiens. We further assessed how additional factors influence cold storage survival, including gyne body weight, body size and colony age. Survival responses varied among species. Bombus vosnesenskii and B. huntii had a lower survival rate in FTR compared to CLT, but B. impatiens gynes had a significantly higher survival rate in FTR. We did not observe significant effects of FTR on lipid stores for any species, but survival increased with an increasing initial weight prior to cold storage. Moreover, gynes produced later in the colony life cycle had lower body weight and decreased survival compared to early emerging gynes. Our study provides insight into how cold storage conditions interact with colony and gyne characteristics to influence captive overwintering survival. Our findings have economic applications for improving commercial rearing and efforts for conservation rearing of at-risk Bombus species.
期刊介绍:
The Journal of Applied Entomology publishes original articles on current research in applied entomology, including mites and spiders in terrestrial ecosystems.
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