Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae)
Under stressful thermal environments, insects adjust their behavior and physiology to maintain key life-history activities and improve survival. For interacting species, mutual or antagonistic, thermal stress may affect the participants in differing ways, which may then affect the outcome of the eco...
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Wiley
2022
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| Online Access: | https://doi.org/10.1111/1744-7917.12466 http://hdl.handle.net/11408/5001 |
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| author | Mutamiswa, Reyard Chidawanyika, Frank Nyamukondiwa, Casper |
| author_facet | Mutamiswa, Reyard Chidawanyika, Frank Nyamukondiwa, Casper |
| author_sort | Mutamiswa, Reyard |
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| description | Under stressful thermal environments, insects adjust their behavior and physiology to maintain key life-history activities and improve survival. For interacting species, mutual or antagonistic, thermal stress may affect the participants in differing ways, which may then affect the outcome of the ecological relationship. In agroecosystems, this may be the fate of relationships between insect pests and their antagonistic parasitoids under acute and chronic thermal variability. Against this background, we investigated the thermal tolerance of different developmental stages of Chilo partellus Swinhoe (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae Cameron (Hymenoptera: Braconidae) using both dynamic and static protocols. When exposed for 2 h to a static temperature, lower lethal temperatures ranged from −9 to 6 °C, −14 to −2 °C, and −1 to 4 °C while upper lethal temperatures ranged from 37 to 48 °C, 41 to 49 °C, and 36 to 39 °C for C. partellus eggs, larvae, and C. sesamiae adults, respectively. Faster heating rates improved critical thermal maxima (CTmax) in C. partellus larvae and adult C. partellus and C. sesamiae. Lower cooling rates improved critical thermal minima (CTmin) in C. partellus and C. sesamiae adults while compromising CTmin in C. partellus larvae. The mean supercooling points (SCPs) for C. partellus larvae, pupae, and adults were −11.82 ± 1.78, −10.43 ± 1.73 and −15.75 ± 2.47, respectively. Heat knock-down time (HKDT) and chill-coma recovery time (CCRT) varied significantly between C. partellus larvae and adults. Larvae had higher HKDT than adults, while the latter recovered significantly faster following chill-coma. Current results suggest developmental stage differences in C. partellus thermal tolerance (with respect to lethal temperatures and critical thermal limits) and a compromised temperature tolerance of parasitoid C. sesamiae relative to its host, suggesting potential asynchrony between host–parasitoid population phenology and consequently biocontrol efficacy under global change. These results have broad implications to biological pest management insect–natural enemy interactions under rapidly changing thermal environments. |
| format | Article |
| id | ir-11408-5001 |
| institution | My University |
| language | English |
| publishDate | 2022 |
| publisher | Wiley |
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| spelling | ir-11408-50012022-07-26T17:07:42Z Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) Mutamiswa, Reyard Chidawanyika, Frank Nyamukondiwa, Casper thermal tolerance spotted stemborer Chilo partellus Swinhoe (Lepidoptera: Crambidae) Cotesia sesamiae Cameron (Hymenoptera: Braconidae) thermal stress Under stressful thermal environments, insects adjust their behavior and physiology to maintain key life-history activities and improve survival. For interacting species, mutual or antagonistic, thermal stress may affect the participants in differing ways, which may then affect the outcome of the ecological relationship. In agroecosystems, this may be the fate of relationships between insect pests and their antagonistic parasitoids under acute and chronic thermal variability. Against this background, we investigated the thermal tolerance of different developmental stages of Chilo partellus Swinhoe (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae Cameron (Hymenoptera: Braconidae) using both dynamic and static protocols. When exposed for 2 h to a static temperature, lower lethal temperatures ranged from −9 to 6 °C, −14 to −2 °C, and −1 to 4 °C while upper lethal temperatures ranged from 37 to 48 °C, 41 to 49 °C, and 36 to 39 °C for C. partellus eggs, larvae, and C. sesamiae adults, respectively. Faster heating rates improved critical thermal maxima (CTmax) in C. partellus larvae and adult C. partellus and C. sesamiae. Lower cooling rates improved critical thermal minima (CTmin) in C. partellus and C. sesamiae adults while compromising CTmin in C. partellus larvae. The mean supercooling points (SCPs) for C. partellus larvae, pupae, and adults were −11.82 ± 1.78, −10.43 ± 1.73 and −15.75 ± 2.47, respectively. Heat knock-down time (HKDT) and chill-coma recovery time (CCRT) varied significantly between C. partellus larvae and adults. Larvae had higher HKDT than adults, while the latter recovered significantly faster following chill-coma. Current results suggest developmental stage differences in C. partellus thermal tolerance (with respect to lethal temperatures and critical thermal limits) and a compromised temperature tolerance of parasitoid C. sesamiae relative to its host, suggesting potential asynchrony between host–parasitoid population phenology and consequently biocontrol efficacy under global change. These results have broad implications to biological pest management insect–natural enemy interactions under rapidly changing thermal environments. 2022-07-26T17:07:42Z 2022-07-26T17:07:42Z 2017 Article 1672-9609 1744-7917 https://doi.org/10.1111/1744-7917.12466 http://hdl.handle.net/11408/5001 en Insect Science;Volume 25, Issue 5; Pages 847-860 open Wiley |
| spellingShingle | thermal tolerance spotted stemborer Chilo partellus Swinhoe (Lepidoptera: Crambidae) Cotesia sesamiae Cameron (Hymenoptera: Braconidae) thermal stress Mutamiswa, Reyard Chidawanyika, Frank Nyamukondiwa, Casper Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title | Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title_full | Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title_fullStr | Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title_full_unstemmed | Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title_short | Comparative assessment of the thermal tolerance of spotted stemborer, Chilo partellus (Lepidoptera: Crambidae) and its larval parasitoid, Cotesia sesamiae (Hymenoptera: Braconidae) |
| title_sort | comparative assessment of the thermal tolerance of spotted stemborer, chilo partellus (lepidoptera: crambidae) and its larval parasitoid, cotesia sesamiae (hymenoptera: braconidae) |
| topic | thermal tolerance spotted stemborer Chilo partellus Swinhoe (Lepidoptera: Crambidae) Cotesia sesamiae Cameron (Hymenoptera: Braconidae) thermal stress |
| url | https://doi.org/10.1111/1744-7917.12466 http://hdl.handle.net/11408/5001 |
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