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Low‐temperature physiology of climatically distinct south African populations of the biological control agent Neochetina eichhorniae
Ecological Entomology ( IF 2.2 ) Pub Date : 2020-08-25 , DOI: 10.1111/een.12935
Daniel J. Rogers 1 , John S. Terblanche 2 , Candice A. Owen 1
Affiliation  

Neochetina eichhorniae is the most widely established biocontrol agent on water hyacinth populations around South Africa. However, some N. eichhorniae populations have failed to adequately control their host population, specifically those exposed to cold conditions. The aim of this study was to determine whether two climatically distinct populations of N. eichhorniae in South Africa differ in their low‐temperature physiology, which tests whether local‐climate adaptation has occurred. We estimated weevil CTmin, LLT50, SCP, and SCP mortality using standard approaches. Contrary to expectation based on climatic thermal profiles at the two sites, weevils from the warm locality ((mean ± SE) CTmin = 5.0 °C ± 0.2, LLT50 = −11.3 °C ± 0.03, SCP = −15.8 °C ± 0.6) were able to maintain activity and tolerate colder temperatures than the weevils from the colder site (CTmin = 6.0 °C ± 0.5, LLT50 = −10.1 °C ± 0.1, SCP = −12.9 °C ± 0.8). These contradictory outcomes are likely explained by the poor nutrient quality of the plants at the cold site, driving low‐temperature performance variation that overrode any macroclimate variation among sites. The cold site weevils may also have adapted to survive wide‐temperature variability, rather than perform well under very cold conditions. In contrast, the mass‐reared population of insects from the warm site has likely adapted to the consistent conditions that they experience over many years in confinement.

中文翻译:

气候不同的南非种群的低温生理学生物控制剂 Neochetina eichhorniae

Neochetina eichhorniae 是南非周围水葫芦种群中最广泛建立的生物防治剂。然而,一些凤眼莲种群未能充分控制其寄主种群,特别是那些暴露在寒冷条件下的种群。本研究的目的是确定南非两个气候不同的凤眼莲种群的低温生理是否不同,以检验是否发生了当地气候适应。我们使用标准方法估计了象鼻虫 CTmin、LLT50、SCP 和 SCP 死亡率。与基于两个地点的气候热剖面的预期相反,来自温暖地区的象鼻虫 ((mean ± SE) CTmin = 5.0 °C ± 0.2, LLT50 = −11.3 °C ± 0.03, SCP = −15.8 °C ± 0。6) 与来自较冷地点的象鼻虫相比,它们能够保持活动并耐受较冷的温度(CTmin = 6.0 °C ± 0.5,LLT50 = -10.1 °C ± 0.1,SCP = -12.9 °C ± 0.8)。这些相互矛盾的结果可能是由于寒冷地点植物的营养质量差,导致低温性能变化超过了地点之间的任何大气候变化。寒冷地点的象鼻虫也可能已经适应了广泛的温度变化,而不是在非常寒冷的条件下表现良好。相比之下,来自温暖地区的大规模饲养的昆虫种群可能已经适应了它们多年来在禁闭中所经历的一致条件。这些相互矛盾的结果可能是由于寒冷地点植物的营养质量差,导致低温性能变化超过了地点之间的任何大气候变化。寒冷地点的象鼻虫也可能已经适应了广泛的温度变化,而不是在非常寒冷的条件下表现良好。相比之下,来自温暖地区的大规模饲养的昆虫种群可能已经适应了它们多年来在禁闭中所经历的一致条件。这些相互矛盾的结果可能是由于寒冷地点植物的营养质量差,导致低温性能变化超过了地点之间的任何大气候变化。寒冷地点的象鼻虫也可能已经适应了广泛的温度变化,而不是在非常寒冷的条件下表现良好。相比之下,来自温暖地区的大规模饲养的昆虫种群可能已经适应了它们多年来在禁闭中所经历的一致条件。
更新日期:2020-08-25
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