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Testing adaptive significance of host manipulation with a parasitoid wasp
Ethology ( IF 1.7 ) Pub Date : 2020-03-10 , DOI: 10.1111/eth.13023
Peter Pecina 1 , Ľubomír Vidlička 1 , Pavol Prokop 1, 2
Affiliation  

According to the extended phenotype hypothesis, certain parasites manipulate the host's behaviour which ultimately enhances the transmission of parasite genes into the next generation. The parasitoid wasp Ampulex compressa attacks and stings its cockroach Periplaneta americana host and lays an egg on the cockroach's leg. Before the wasp's oviposition, the stung cockroach engages in excessive self‐grooming for about 30 min. The prey location hypothesis posits that self‐grooming may allow the wasp to easily locate its host before transporting it to the nest. To test this hypothesis, we manipulated the mobility of the stung cockroach under different spatial constraints. Latencies to locate stung cockroaches with unlimited movement were similar than latencies to locate stung, but motionless cockroaches irrespectively of spatial constraints. Wasps were less willing to lay eggs and seal an entrance to the burrow in treatments with motionless cockroaches which suggests that if the expected reproductive success is low, then parental investment decreases. Our results provide no support for the location hypothesis and call for further experimental investigation of the extended phenotype hypothesis in parasite–host interactions.

中文翻译:

用寄生蜂测试宿主操纵的适应性意义

根据扩展表型假设,某些寄生虫操纵宿主的行为,最终增强了寄生虫基因向下一代的传播。寄生蜂 Ampulex compressa 攻击并蜇它的美洲大蠊宿主,并在蟑螂的腿上产卵。在黄蜂产卵之前,被蜇伤的蟑螂会过度自我梳理约 30 分钟。猎物定位假说假定,自我梳理可能使黄蜂在将其运送到巢穴之前轻松定位其宿主。为了验证这一假设,我们在不同的空间限制下操纵了蜇蜇蟑螂的活动性。定位无限制运动的被刺蟑螂的潜伏期与定位被刺蟑螂的潜伏期相似,但无论空间限制如何,一动不动的蟑螂。在用不动的蟑螂治疗时,黄蜂不太愿意产卵和密封洞穴入口,这表明如果预期的繁殖成功率低,那么父母的投资就会减少。我们的结果不支持定位假设,并呼吁对寄生虫-宿主相互作用中的扩展表型假设进行进一步的实验研究。
更新日期:2020-03-10
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