Contrasting strategies of resistance vs. tolerance to desiccation in two polar dipterans

Polar research

M.R. Worland¹  J.S. Bale²  P. Convey²  S.A.L. Hayward³  M.J. Everatt⁴ 

[1] National Antarctic Research CenterIPS Building, University Malaya, 50603 Kuala Lumpur, Malaysia;British Antarctic SurveyNatural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;School of BiosciencesUniversity of Birmingham, Edgbaston, Birmingham B15 2TT, UK;School of BiosciencesUniversity of Birmingham, Edgbaston, Birmingham B15 2TT, UKCorrespondence

关键词: Acclimation;    dipteran;    supercooling point;    temperature;    cross-tolerance;   

DOI  :  10.3402/polar.v33.22963

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Low water availability is one of the principal stressors for terrestrial invertebrates in the polar regions, determining the survival of individuals, the success of species and the composition of communities. The Arctic and Antarctic dipterans Heleomyza borealis and Eretmoptera murphyi spend the majority of their biennial life cycles as larvae, and so are exposed to the full range of environmental conditions, including low water availability, over the annual cycle. In the current study, the desiccation resistance and desiccation tolerance of larvae were investigated, as well as their capacity for cross-tolerance to temperature stress. Larvae of H. borealis showed high levels of desiccation resistance, only losing 6.9% of their body water after 12 days at 98.2% relative humidity (RH). In contrast, larvae of E. murphyi lost 46.7% of their body water after 12 days at the same RH. Survival of E. murphyi larvae remained high in spite of this loss (>80% survival). Following exposure to 98.2% RH, larvae of E. mu...

【 授权许可】

CC BY-NC