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Effects of high CO 2 on mating success, mating duration, and sperm transfer in the West Indian sweet potato weevil, Euscepes postfasciatus
Entomologia Experimentalis et Applicata ( IF 1.4 ) Pub Date : 2020-03-11 , DOI: 10.1111/eea.12885
Ayame Nunohiro 1 , Norikuni Kumano 1
Affiliation  

Most terrestrial animals live in natural atmospheric conditions, but some are also adapted to low oxygen (hypoxic) or high‐carbon dioxide (hypercapnic) conditions, such as in social insect nests, soil, caves, wood, and decaying material. Although it is possible that individuals adapt their behaviour to the environmental condition of their habitats, mating behaviour under ecologically possible ranges of CO2 has not been well studied. We compared walking activity, duration of mating behaviour, and sperm transfer ability in the West Indian sweet potato weevil, Euscepes postfasciatus Fairmaire (Coleoptera: Curculionidae), in high CO2 (10 000 p.p.m.) vs. normal atmospheric conditions (laboratory air, ca. 800 p.p.m.). We found that high CO2 enhanced walking activity and mounting frequency. Under such circumstances, we predicted that enhanced activities under a high‐CO2 environment would increase the risk of sperm competition, which induces an extended copulation period and an increase in sperm transfer. However, weevils shortened the mating period and did not alter their sperm transfer ability under high CO2. These findings are, as far as we are aware, the first report of the effect of ecologically relevant high CO2 on insect mating behaviour under mass‐rearing conditions. The effect of ambient conditions on mating behaviour and sperm transfer is discussed in relation to the intensity of female refusal behaviour directed against males.

中文翻译:

高 CO 2 对西印度甘薯象甲 Euscepes postfasciatus 交配成功率、交配持续时间和精子转移的影响

大多数陆生动物生活在自然大气条件下,但有些也适应低氧(缺氧)或高二氧化碳(高碳酸血症)条件,例如社会昆虫巢穴、土壤、洞穴、木材和腐烂材料。尽管个体可能会根据其栖息地的环境条件调整其行为,但尚未对生态可能的 CO2 范围内的交配行为进行充分研究。我们比较了西印度甘薯象鼻虫 Euscepes postfasciatus Fairmaire(鞘翅目:仙茅科)在高 CO2(10 000 ppm)与正常大气条件(实验室空气,约800 ppm)。我们发现高 CO2 增强了步行活动和安装频率。在这样的情况下,我们预测,在高 CO2 环境下增强的活动会增加精子竞争的风险,从而导致延长交配期和增加精子转移。然而,象鼻虫缩短了交配期,并且在高二氧化碳浓度下并没有改变它们的精子转移能力。据我们所知,这些发现是生态相关的高 CO2 对大规模饲养条件下昆虫交配行为影响的第一份报告。环境条件对交配行为和精子转移的影响与雌性针对雄性的拒绝行为的强度有关。象鼻虫缩短了交配期,并且在高二氧化碳浓度下不会改变它们的精子转移能力。据我们所知,这些发现是生态相关的高二氧化碳对大规模饲养条件下昆虫交配行为影响的第一份报告。环境条件对交配行为和精子转移的影响与雌性针对雄性的拒绝行为的强度有关。象鼻虫缩短了交配期,并且在高二氧化碳浓度下不会改变它们的精子转移能力。据我们所知,这些发现是生态相关的高 CO2 对大规模饲养条件下昆虫交配行为影响的第一份报告。环境条件对交配行为和精子转移的影响与雌性针对雄性的拒绝行为的强度有关。
更新日期:2020-03-11
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