Heat tolerance and physiological plasticity in the Antarctic collembolan, Cryptopygus antarcticus, and mite, Alaskozetes antarcticus

Abstract

13Polar amplification of global warming has led to an average 2 o C rise in air temperatures in parts of the 14 polar regions in the last 50 years. Poikilothermic ectotherms that are found in these regions, such as 15Collembola and mites, may therefore be put under pressure by changing environmental conditions. 16However, it has also been suggested that the thermal sensitivity of invertebrates declines with higher 17 latitudes and, therefore, that polar ectotherms may not be at risk. In the current study, the heat 18 tolerance and physiological plasticity to heat stress of two well-studied

Differences in collembola species assemblages (Arthropoda) between spoil tips and surrounding environments are dependent on vegetation development

“…Consequently, these rough conditions might play a role of emvironemental filter 103,106 and result in a functional traits variation of regional species 10,107 . However, those conditions can also be factors of adaptation for other species 108–110 . This is particularly relevant for groups of species like Collembola for which the most important environmental factors for their growth and their development are temperature, humidity and food.…”

Are the Antarctic dipteran,Eretmoptera murphyi, and Arctic collembolan,Megaphorura arctica, vulnerable to rising temperatures?

“…The temperature experienced by the invertebrates was measured by placing a thermocouple within an identical Eppendorf tube into one of the glass test tubes. Humidity typically remains high within this experimental setup, and is assumed not to impact survival based on previous findings (Everatt et al, 2013). At the end of experimental treatments, individuals were rapidly transferred (over ice) from the Eppendorf tubes into plastic universal tubes containing substratum, and returned to the rearing conditions (see also Everatt et al, 2013).…”

“…Humidity typically remains high within this experimental setup, and is assumed not to impact survival based on previous findings (Everatt et al, 2013). At the end of experimental treatments, individuals were rapidly transferred (over ice) from the Eppendorf tubes into plastic universal tubes containing substratum, and returned to the rearing conditions (see also Everatt et al, 2013). Survival, defined by individuals moving either spontaneously or in response to gentle contact stimulus, was assessed 72 h after treatment.…”

Effects of heat shock on survival and predation of an important whitefly predator,Serangium japonicum

“…A 0.5‐h exposure to 39 °C caused approximately 50% mortality in Frankliniella occidentalis (Pergande) adults (Li et al., ). Some polar terrestrial invertebrates such as Eretmoptera murphyi Schaeffer and Cryptopygus antarcticus Willem were quite susceptible to heat stress and could not even survive 1 h at 35 and 37 °C, respectively (Everatt et al., , ). On the contrary, the bed bug Cimex lectularius L. and the confused flour beetle, Tribolium confusum Jacquelin du Val, were very tolerant to heat stress (Boina & Subramanyam, ; Benoit et al., ).…”