Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm
Temperature and dehydration stress are two major co-occurring environmental stressors threatening the physiology, biochemistry, and ecology of insects. As such, understanding adaptive responses to desiccation stress is critical for predicting climate change impacts, particularly its influence on ins...
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Entomological Society of America and Oxford University Press
2022
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| Online Access: | https://doi.org/10.1093/jee/toab128 http://hdl.handle.net/11408/4943 |
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| author | Tarusikirwa, Vimbai L Cuthbert, Ross N Mutamiswa, Reyard Gotcha, Nonofo Nyamukondiwa, Casper |
| author_facet | Tarusikirwa, Vimbai L Cuthbert, Ross N Mutamiswa, Reyard Gotcha, Nonofo Nyamukondiwa, Casper |
| author_sort | Tarusikirwa, Vimbai L |
| collection | DSpace |
| description | Temperature and dehydration stress are two major co-occurring environmental stressors threatening the physiology, biochemistry, and ecology of insects. As such, understanding adaptive responses to desiccation stress is critical for predicting climate change impacts, particularly its influence on insect invasions. Here, we assessed water balance and desiccation resistance of the invasive Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae), and infer how eco-physiology shapes its niche. We measured basal body water and lipid content, water loss rates (WLRs), and desiccation resistance in larvae (second to fourth instars) and adults. Body -water, -lipid, and WLRs significantly varied across life stages. Second instars recorded the lowest while fourth instars exhibited the highest body water and lipid content. Adult body water and lipid content were higher than second and third instars and lower than fourth instars while proportion of body water and lipid contents were highest in adults and second larval instars respectively. Water loss rates were significantly highest in fourth-instar larvae compared to other life stages, but differences among stages were less apparent at longer exposure durations (48 h). Desiccation resistance assays showed that second instars had greatest mortality while fourth-instar larvae and adults were the most desiccation tolerant. Our results show that T. absoluta fourth-instar larvae and adults are the most resilient developmental stages and potentially contribute most to the invasion success of the pest in arid environments. Incorporation of these species-specific eco-physiological traits in predictive models can help refine invasive species potential spread under changing climates. |
| format | Article |
| id | ir-11408-4943 |
| institution | My University |
| language | English |
| publishDate | 2022 |
| publisher | Entomological Society of America and Oxford University Press |
| record_format | dspace |
| spelling | ir-11408-49432022-07-07T09:40:05Z Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm Tarusikirwa, Vimbai L Cuthbert, Ross N Mutamiswa, Reyard Gotcha, Nonofo Nyamukondiwa, Casper adaptive mechanism dehydration tolerance insect invasion niche adaptation tomato leafminer Temperature and dehydration stress are two major co-occurring environmental stressors threatening the physiology, biochemistry, and ecology of insects. As such, understanding adaptive responses to desiccation stress is critical for predicting climate change impacts, particularly its influence on insect invasions. Here, we assessed water balance and desiccation resistance of the invasive Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae), and infer how eco-physiology shapes its niche. We measured basal body water and lipid content, water loss rates (WLRs), and desiccation resistance in larvae (second to fourth instars) and adults. Body -water, -lipid, and WLRs significantly varied across life stages. Second instars recorded the lowest while fourth instars exhibited the highest body water and lipid content. Adult body water and lipid content were higher than second and third instars and lower than fourth instars while proportion of body water and lipid contents were highest in adults and second larval instars respectively. Water loss rates were significantly highest in fourth-instar larvae compared to other life stages, but differences among stages were less apparent at longer exposure durations (48 h). Desiccation resistance assays showed that second instars had greatest mortality while fourth-instar larvae and adults were the most desiccation tolerant. Our results show that T. absoluta fourth-instar larvae and adults are the most resilient developmental stages and potentially contribute most to the invasion success of the pest in arid environments. Incorporation of these species-specific eco-physiological traits in predictive models can help refine invasive species potential spread under changing climates. 2022-07-07T09:40:05Z 2022-07-07T09:40:05Z 2021 Article Vimbai L Tarusikirwa, Ross N Cuthbert, Reyard Mutamiswa, Nonofo Gotcha, Casper Nyamukondiwa, Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm, Journal of Economic Entomology, Volume 114, Issue 4, August 2021, Pages 1743–1751, https://doi.org/10.1093/jee/toab128 0022-0493 1938-291X https://doi.org/10.1093/jee/toab128 http://hdl.handle.net/11408/4943 en Journal of Economic Entomology;Volume 114, Issue 4, Pages 1743–175 open Entomological Society of America and Oxford University Press |
| spellingShingle | adaptive mechanism dehydration tolerance insect invasion niche adaptation tomato leafminer Tarusikirwa, Vimbai L Cuthbert, Ross N Mutamiswa, Reyard Gotcha, Nonofo Nyamukondiwa, Casper Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title | Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title_full | Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title_fullStr | Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title_full_unstemmed | Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title_short | Water Balance and Desiccation Tolerance of the Invasive South American Tomato Pinworm |
| title_sort | water balance and desiccation tolerance of the invasive south american tomato pinworm |
| topic | adaptive mechanism dehydration tolerance insect invasion niche adaptation tomato leafminer |
| url | https://doi.org/10.1093/jee/toab128 http://hdl.handle.net/11408/4943 |
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