Heat stress survival and thermal tolerance of Australian stingless bees
Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved..
Stingless bees (Meliponini) are important pollinators throughout the world's tropical and subtropical regions. Understanding their thermal tolerance is key to predicting their resilience to changing climates and increasingly frequent extreme heat events. We examined critical thermal maxima (CTmax), survival during 1-8 h heat periods, chill coma recovery and thermal preference for Australian meliponine species that occupy different climates across their ranges: Tetragonula carbonaria (tropical to temperate regions), T. hockingsi (tropical and subtropical regions only) and Austroplebeia australis (widely distributed including arid regions). We found interspecific differences in thermal tolerance consistent with differences in the climate variability observed in each species' range. Foragers of A. australis had a faster chill coma recovery (288 s) than foragers of T. hockingsi (1059 s) and T. carbonaria (872 s). Austroplebeia australis also had the highest CTmax of 44.5 °C, while the CTmax of the two Tetragonula species was ∼43.1 °C. After a 1-h heat exposure, T. carbonaria foragers experienced 95% mortality at 42 °C, and 100% at 45 °C. Surprisingly, larvae and pupae of both Tetragonula species were more resistant to heat exposure than foragers. Within an enclosed temperature gradient apparatus (17-38 °C), no clear preference was found for foragers; however, they were most frequently observed at ∼18 °C. Results indicate that in some regions of Australia, meliponines already experience periodic heat events exceeding their thermal maxima. Employing effective management strategies (such as nest site insulation and habitat preservation) may be crucial to colony survival under continued climate change.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:117 |
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| Enthalten in: |
Journal of thermal biology - 117(2023) vom: 15. Okt., Seite 103671 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Nacko, Scott [VerfasserIn] |
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| Links: |
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| Themen: |
Austroplebeia |
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| Anmerkungen: |
Date Revised 20.10.2023 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1016/j.jtherbio.2023.103671 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM361754906 |
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| 520 | |a Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved. | ||
| 520 | |a Stingless bees (Meliponini) are important pollinators throughout the world's tropical and subtropical regions. Understanding their thermal tolerance is key to predicting their resilience to changing climates and increasingly frequent extreme heat events. We examined critical thermal maxima (CTmax), survival during 1-8 h heat periods, chill coma recovery and thermal preference for Australian meliponine species that occupy different climates across their ranges: Tetragonula carbonaria (tropical to temperate regions), T. hockingsi (tropical and subtropical regions only) and Austroplebeia australis (widely distributed including arid regions). We found interspecific differences in thermal tolerance consistent with differences in the climate variability observed in each species' range. Foragers of A. australis had a faster chill coma recovery (288 s) than foragers of T. hockingsi (1059 s) and T. carbonaria (872 s). Austroplebeia australis also had the highest CTmax of 44.5 °C, while the CTmax of the two Tetragonula species was ∼43.1 °C. After a 1-h heat exposure, T. carbonaria foragers experienced 95% mortality at 42 °C, and 100% at 45 °C. Surprisingly, larvae and pupae of both Tetragonula species were more resistant to heat exposure than foragers. Within an enclosed temperature gradient apparatus (17-38 °C), no clear preference was found for foragers; however, they were most frequently observed at ∼18 °C. Results indicate that in some regions of Australia, meliponines already experience periodic heat events exceeding their thermal maxima. Employing effective management strategies (such as nest site insulation and habitat preservation) may be crucial to colony survival under continued climate change | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Austroplebeia | |
| 650 | 4 | |a Chill coma | |
| 650 | 4 | |a Critical thermal maxima | |
| 650 | 4 | |a Meliponini | |
| 650 | 4 | |a Stingless bee | |
| 650 | 4 | |a Tetragonula | |
| 650 | 4 | |a Thermal biology | |
| 700 | 1 | |a Hall, Mark A |e verfasserin |4 aut | |
| 700 | 1 | |a Gloag, Rosalyn |e verfasserin |4 aut | |
| 700 | 1 | |a Lynch, Kate E |e verfasserin |4 aut | |
| 700 | 1 | |a Spooner-Hart, Robert N |e verfasserin |4 aut | |
| 700 | 1 | |a Cook, James M |e verfasserin |4 aut | |
| 700 | 1 | |a Riegler, Markus |e verfasserin |4 aut | |
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