Author(s) |
Bawa, Samuel A
Gregg, Peter C
Del Soccoro, Alice P
Miller, Cara
Andrew, Nigel R
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Publication Date |
2021-11-17
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Abstract |
<p>Temperature is a crucial driver of insect activity and physiological processes throughout their life-history, and heat stress may impact life stages (larvae, pupae and adult) in different ways. Using thermolimit respirometry, we assessed the critical thermal maxima (CT<sub>max</sub>-temperature at which an organism loses neuromuscular control), CO<sub>2</sub> emission rate (V́CO<sub>2</sub>) and Q10 (a measure of V́CO<sub>2</sub> temperature sensitivity) of three different life stages of <i>Helicoverpa punctigera</i> (Wallengren) by increasing their temperature exposure from 25 <sup>o</sup>C to 55 <sup>o</sup>C at a rate of 0.25 <sup>o</sup>C min<sup>-1</sup> . We found that the CT<sub>max</sub> of larvae (49.1 <sup>o</sup>C ± 0.3 <sup>o</sup>C) was higher than pupae (47.4 <sup>o</sup>C ± 0.2 <sup>o</sup>C) and adults (46.9 <sup>o</sup>C ± 0.2 <sup>o</sup>C). The mean mass-specific CO<sub>2</sub> emission rate (ml V́CO<sub>2</sub> h<sup>-1</sup>) of larvae (0.26 ± 0.03 ml V́CO<sub>2</sub> h<sup>-1</sup>) was also higher than adults (0.24 ± 0.04 ml V́CO<sub>2</sub> h<sup>-1</sup>) and pupae (0.06 ± 0.02 ml V́CO<sub>2</sub> h<sup>-1</sup>). The Q<sub>10</sub>: 25-35 <sup>o</sup>C for adults (2.01 ± 0.22) was significantly higher compared to larvae (1.40 ± 0.06) and Q<sub>10</sub>: 35-45 <sup>o</sup>C for adults (3.42 ± 0.24) was significantly higher compared to larvae (1.95 ± 0.08) and pupae (1.42 ± 0.98) respectively. We have established the upper thermal tolerance of <i>H. punctigera</i>, which will lead to a better understanding of the thermal physiology of this species both in its native range, and as a pest species in agricultural systems.</p>
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Citation |
PeerJ, v.9, p. 1-20
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ISSN |
2167-8359
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Pubmed ID |
34820201
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Link | |
Publisher |
PeerJ, Ltd
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Rights |
Attribution 4.0 International
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Title |
Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
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Type of document |
Journal Article
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Entity Type |
Publication
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Name | Size | format | Description | Link |
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openpublished/EstimatingBawaGreggSocorroMillerAndrew2021JournalArticle.pdf | 1854.541 KB | application/pdf | Published version | View document |