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https://hdl.handle.net/1959.11/14469
Title: | Thermal Tolerance Limits of Diamondback Moth in Ramping and Plunging Assays | Contributor(s): | Nguyen, Chi (author); Bahar, M H (author); Baker, Greg (author); Andrew, Nigel R (author) | Publication Date: | 2014 | Open Access: | Yes | DOI: | 10.1371/journal.pone.0087535 | Handle Link: | https://hdl.handle.net/1959.11/14469 | Abstract: | Thermal sensitivity is a crucial determinant of insect abundance and distribution. The way it is measured can have a critical influence on the conclusions made. Diamondback moth (DBM), 'Plutella xylostella' (L.) (Lepidoptera: Plutellidae) is an important insect pest of cruciferous crops around the world and the thermal responses of polyphagous species are critical to understand the influences of a rapidly changing climate on their distribution and abundance. Experiments were carried out to the lethal temperature limits (ULT₀ and LLT₀: temperatures where there is no survival) as well as Upper and Lower Lethal Temperature (ULT₂₅ and LLT₂₅) (temperature where 25% DBM survived) of lab-reared adult DBM population to extreme temperatures attained by either two-way ramping (ramping temperatures from baseline to LT₂₅ and ramping back again) or sudden plunging method. In this study the ULT₀ for DBM was recorded as 42.6°C and LLT₀ was recorded as 216.5°C. DBM had an ULT₂₅ of 41.8°C and LLT₂₅ of 215.2°C. The duration of exposure to extreme temperatures had significant impacts on survival of DBM, with extreme temperatures and/or longer durations contributing to higher lethality. Comparing the two-way ramping temperature treatment to that of direct plunging temperature treatment, our study clearly demonstrated that DBM was more tolerant to temperature in the two-way ramping assay than that of the plunging assay for cold temperatures, but at warmer temperatures survival exhibited no differences between ramping and plunging. These results suggest that DBM will not be put under physiological stress from a rapidly changing climate, rather access to host plants in marginal habitats has enabled them to expand their distribution. Two-way temperature ramping enhances survival of DBM at cold temperatures, and this needs to be examined across a range of taxa and life stages to determine if enhanced survival is widespread incorporating a ramping recovery method. | Publication Type: | Journal Article | Source of Publication: | PLoS One, 9(1), p. 1-8 | Publisher: | Public Library of Science | Place of Publication: | United States of America | ISSN: | 1932-6203 | Fields of Research (FoR) 2008: | 060806 Animal Physiological Ecology 069902 Global Change Biology |
Fields of Research (FoR) 2020: | 310907 Animal physiological ecology 319902 Global change biology |
Socio-Economic Objective (SEO) 2008: | 970106 Expanding Knowledge in the Biological Sciences 960301 Climate Change Adaptation Measures |
Socio-Economic Objective (SEO) 2020: | 280102 Expanding knowledge in the biological sciences 190101 Climate change adaptation measures (excl. ecosystem) |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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