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Water relations and drought sensitivity of Folsomia candida eggs (Collembola: Isotomidae)

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Drought tolerance of juvenile and adult life stages is relatively well understood, but very little is known about the tolerance of eggs to drought in this group of animals. The aim of the present study was therefore to investigate the water relations and drought sensitivity of eggs of the hygrophilic springtail, Folsomia candida Willem, 1902 (Isotomidae), exposed to a range of soil water potentials above and below the permanent wilting point of plants (-1.5 MPa). Under saturated conditions, eggs absorbed water during development and increased water content from 1.1 to 2.9 mg mg -1 dry weight. By increasing drought conditions, water absorption was gradually reduced and was nullified approximately at the soil water potential equivalent to the osmolality of egg fluids (630 mOsm corresponding to -1.53 MPa). Eggs had a lower permeability for water (68 ± 13 μg water cm -2 h -1 mm Hg -1) than adults (about 400 μg water cm -2 h -1 mm Hg -1), but eggs were much more sensitive to drought than adults. Eggs did not survive exposure to -1.5 MPa, whereas adults readily survive this level of drought by absorbing water vapour. In conclusion, eggs of F. candida are sensitive to drought and would perish if soil water potential in the field approaches the wilting point of plants, which is often reached during summer droughts. The persistence of this species depends on the survival of post-embryonic life stages.

Original languageEnglish
Article number025
JournalEuropean Journal of Entomology
Volume116
Pages (from-to)229-234
Number of pages6
ISSN1210-5759
DOIs
Publication statusPublished - 2019

    Research areas

  • Collembola, Desiccation, Eggs, Embryonic development, Folsomia candida, Osmolality, Permeability, Soil water potential

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