Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)

The incidence and severity of environmental stressors associated with global climate change are increasing and insects frequently face variability in temperature and moisture regimes at variable spatio-temporal scales. Coincidental with this, is increased thermal and hydric stress on insects as warm...

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Main Authors: Mutamiswa, Reyard, Tarusikirwa, Vimbai, Nyamukondiwa, Casper, Chidawanyika, Frank
Format: Article
Language:English
Published: Wiley 2022
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Online Access:https://doi.org/10.1111/jen.12795
http://hdl.handle.net/11408/4963
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author Mutamiswa, Reyard
Tarusikirwa, Vimbai
Nyamukondiwa, Casper
Chidawanyika, Frank
author_facet Mutamiswa, Reyard
Tarusikirwa, Vimbai
Nyamukondiwa, Casper
Chidawanyika, Frank
author_sort Mutamiswa, Reyard
collection DSpace
description The incidence and severity of environmental stressors associated with global climate change are increasing and insects frequently face variability in temperature and moisture regimes at variable spatio-temporal scales. Coincidental with this, is increased thermal and hydric stress on insects as warming increases vapour pressure deficit (VPD), the drying power of the air. While the effects of mean temperatures on fitness are widely documented, fluctuations in both temperature and relative humidity (RH) are largely unexplored. Here, we investigated the effects of dynamic temperature and RH fluctuations (around the mean [28°C; 65% RH]) on low and high thermal tolerance of laboratory-reared adult invasive Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), measured as critical thermal minima (CTmin), critical thermal maxima (CTmax), chill coma recovery time (CCRT) and heat knockdown time (HKDT). Our results show that increased environmental amplitude significantly influenced low and high temperature responses and varied across traits tested. The highest amplitude (δ12°C; 28% RH) compromised CTmin, CCRT and HKDT traits while enhancing CTmax. Similarly, acclimation to δ3°C; 7% RH compromised both low (CTmin and CCRT) and high (CTmax and HKDT) fitness traits. Variations in fitness reported here indicate significant roles of combined thermal and moisture fluctuations on B. dorsalis fitness suggesting caveats that are worthy considering when predicting species responses to climate change. These results are significant for B. dorsalis population phenology, management, quantifying vulnerability to climate variability and may help modelling future biogeographical patterns.
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spelling ir-11408-49632022-07-14T12:45:08Z Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae) Mutamiswa, Reyard Tarusikirwa, Vimbai Nyamukondiwa, Casper Chidawanyika, Frank thermal tolerance thermal and hydric stress vapour pressure deficit (VPD) dynamic temperature and RH fluctuations Bactrocera dorsalis (Diptera: Tephritidae) The incidence and severity of environmental stressors associated with global climate change are increasing and insects frequently face variability in temperature and moisture regimes at variable spatio-temporal scales. Coincidental with this, is increased thermal and hydric stress on insects as warming increases vapour pressure deficit (VPD), the drying power of the air. While the effects of mean temperatures on fitness are widely documented, fluctuations in both temperature and relative humidity (RH) are largely unexplored. Here, we investigated the effects of dynamic temperature and RH fluctuations (around the mean [28°C; 65% RH]) on low and high thermal tolerance of laboratory-reared adult invasive Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), measured as critical thermal minima (CTmin), critical thermal maxima (CTmax), chill coma recovery time (CCRT) and heat knockdown time (HKDT). Our results show that increased environmental amplitude significantly influenced low and high temperature responses and varied across traits tested. The highest amplitude (δ12°C; 28% RH) compromised CTmin, CCRT and HKDT traits while enhancing CTmax. Similarly, acclimation to δ3°C; 7% RH compromised both low (CTmin and CCRT) and high (CTmax and HKDT) fitness traits. Variations in fitness reported here indicate significant roles of combined thermal and moisture fluctuations on B. dorsalis fitness suggesting caveats that are worthy considering when predicting species responses to climate change. These results are significant for B. dorsalis population phenology, management, quantifying vulnerability to climate variability and may help modelling future biogeographical patterns. 2022-07-14T12:45:08Z 2022-07-14T12:45:08Z 2020 Article 0931-2048 1439-0418 https://doi.org/10.1111/jen.12795 http://hdl.handle.net/11408/4963 en Journal of Applied Entomology;Volume144, Issue10; Pages 885-896 open Wiley
spellingShingle thermal tolerance
thermal and hydric stress
vapour pressure deficit (VPD)
dynamic temperature and RH fluctuations
Bactrocera dorsalis (Diptera: Tephritidae)
Mutamiswa, Reyard
Tarusikirwa, Vimbai
Nyamukondiwa, Casper
Chidawanyika, Frank
Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title_full Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title_fullStr Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title_full_unstemmed Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title_short Fluctuating environments impact thermal tolerance in an invasive insect species Bactrocera dorsalis (Diptera: Tephritidae)
title_sort fluctuating environments impact thermal tolerance in an invasive insect species bactrocera dorsalis (diptera: tephritidae)
topic thermal tolerance
thermal and hydric stress
vapour pressure deficit (VPD)
dynamic temperature and RH fluctuations
Bactrocera dorsalis (Diptera: Tephritidae)
url https://doi.org/10.1111/jen.12795
http://hdl.handle.net/11408/4963
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AT nyamukondiwacasper fluctuatingenvironmentsimpactthermaltoleranceinaninvasiveinsectspeciesbactroceradorsalisdipteratephritidae
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