Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages

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 (CTmax-temperature at which an org...

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Autores principales:	Samuel A. Bawa, Peter C. Gregg, Alice P. Del Soccoro, Cara Miller, Nigel R. Andrew
Formato:	article
Lenguaje:	EN
Publicado:	PeerJ Inc. 2021
Materias:	Helicoverpa punctigera Life stage Critical thermal maxima Metabolic rate Thermolomit respirometry Medicine R
Acceso en línea:	https://doaj.org/article/5d6d1625bd554686a5af9c154d87080c
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spelling	oai:doaj.org-article:5d6d1625bd554686a5af9c154d87080c2021-11-19T15:05:11ZEstimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages10.7717/peerj.124792167-8359https://doaj.org/article/5d6d1625bd554686a5af9c154d87080c2021-11-01T00:00:00Zhttps://peerj.com/articles/12479.pdfhttps://peerj.com/articles/12479/https://doaj.org/toc/2167-8359Temperature 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 (CTmax-temperature at which an organism loses neuromuscular control), CO2 emission rate (V́CO2) and Q10 (a measure of V́CO2 temperature sensitivity) of three different life stages of Helicoverpa punctigera (Wallengren) by increasing their temperature exposure from 25 °C to 55 °C at a rate of 0.25 °C min−1. We found that the CTmax of larvae (49.1 °C ± 0.3 °C) was higher than pupae (47.4 °C ± 0.2 °C) and adults (46.9 °C ± 0.2 °C). The mean mass-specific CO2 emission rate (ml V́CO2 h−1) of larvae (0.26 ± 0.03 ml V́CO2 h−1) was also higher than adults (0.24 ± 0.04 ml V́CO2 h−1) and pupae (0.06 ± 0.02 ml V́CO2 h−1). The Q10: 25–35 °C for adults (2.01 ± 0.22) was significantly higher compared to larvae (1.40 ± 0.06) and Q10: 35–45 °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 H. punctigera, 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.Samuel A. BawaPeter C. GreggAlice P. Del SoccoroCara MillerNigel R. AndrewPeerJ Inc.articleHelicoverpa punctigeraLife stageCritical thermal maximaMetabolic rateThermolomit respirometryMedicineRENPeerJ, Vol 9, p e12479 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Helicoverpa punctigera Life stage Critical thermal maxima Metabolic rate Thermolomit respirometry Medicine R
spellingShingle	Helicoverpa punctigera Life stage Critical thermal maxima Metabolic rate Thermolomit respirometry Medicine R Samuel A. Bawa Peter C. Gregg Alice P. Del Soccoro Cara Miller Nigel R. Andrew Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
description	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 (CTmax-temperature at which an organism loses neuromuscular control), CO2 emission rate (V́CO2) and Q10 (a measure of V́CO2 temperature sensitivity) of three different life stages of Helicoverpa punctigera (Wallengren) by increasing their temperature exposure from 25 °C to 55 °C at a rate of 0.25 °C min−1. We found that the CTmax of larvae (49.1 °C ± 0.3 °C) was higher than pupae (47.4 °C ± 0.2 °C) and adults (46.9 °C ± 0.2 °C). The mean mass-specific CO2 emission rate (ml V́CO2 h−1) of larvae (0.26 ± 0.03 ml V́CO2 h−1) was also higher than adults (0.24 ± 0.04 ml V́CO2 h−1) and pupae (0.06 ± 0.02 ml V́CO2 h−1). The Q10: 25–35 °C for adults (2.01 ± 0.22) was significantly higher compared to larvae (1.40 ± 0.06) and Q10: 35–45 °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 H. punctigera, 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.
format	article
author	Samuel A. Bawa Peter C. Gregg Alice P. Del Soccoro Cara Miller Nigel R. Andrew
author_facet	Samuel A. Bawa Peter C. Gregg Alice P. Del Soccoro Cara Miller Nigel R. Andrew
author_sort	Samuel A. Bawa
title	Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
title_short	Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
title_full	Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
title_fullStr	Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
title_full_unstemmed	Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages
title_sort	estimating the differences in critical thermal maximum and metabolic rate of helicoverpa punctigera (wallengren) (lepidoptera: noctuidae) across life stages
publisher	PeerJ Inc.
publishDate	2021
url	https://doaj.org/article/5d6d1625bd554686a5af9c154d87080c
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Estimating the differences in critical thermal maximum and metabolic rate of Helicoverpa punctigera (Wallengren) (Lepidoptera: Noctuidae) across life stages

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