Acclimation to moderate temperatures can have strong negative impacts on heat tolerance of arctic arthropods ...
The Arctic is impacted by some of the fastest temperature changes observed on Earth, but the impact on terrestrial arthropod fauna is unclear. Acute physiological thermal limits of terrestrial ectotherms from high latitudes often exceed the local air temperatures, suggesting that they may be able to...
| Main Authors: | , , , |
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| Format: | Dataset |
| Language: | English |
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Dryad
2024
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5061/dryad.m63xsj49q https://datadryad.org/stash/dataset/doi:10.5061/dryad.m63xsj49q |
| Summary: | The Arctic is impacted by some of the fastest temperature changes observed on Earth, but the impact on terrestrial arthropod fauna is unclear. Acute physiological thermal limits of terrestrial ectotherms from high latitudes often exceed the local air temperatures, suggesting that they may be able to cope with increasing temperatures. However, knowledge of how arctic terrestrial arthropods cope with elevated temperatures for longer periods is lacking. Here we investigate how acclimation temperature and exposure time affect the acute physiological heat tolerance of five terrestrial arthropod species (Neomolgus littoralis, Megaphorura arctica, Nysius groenlandicus, Psammotettix lividellus, and Nabis flavomarginatus) immediately after collection in arctic and sub-arctic habitats. We show that although acute heat tolerances are relatively high, even exposure to moderate (temperature span assessed ca. 3-29°C) acclimation temperatures for 24 hours have strong negative effects on heat tolerance for four of the five ... : Microhabitat temperatures Temperature loggers were placed at the sites where the animals were collected. At Ny Ålesund, two SmartButton loggers (SmartButton, ACR System Inc.) were placed in and on gravel at the beach to record the thermal environment (every 5 minutes) where individuals of N. littoralis were caught, and at a protected and an exposed tundra area, representative. At Narsarsuaq, air temperature and ground-level temperature at the collection site were continuously recorded (every 15 minutes) using TMS-4 dataloggers (TMS-4, TOMST, Czech Republic) to record the thermal environment in which the individuals were caught. Thermal tolerance Two assays were used to measure heat tolerance in the present study: 1) critical thermal maximum temperature (CTmax), where the specimens were exposed to gradually increasing temperatures and the temperature at which they entered heat coma was recorded, and 2) heat knockdown time (HKDT), where the specimens were exposed to a constant, stressful temperature, and the ... |
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