Winter survival of Ceramica pisi (Lepidoptera: Noctuidae) in Iceland

Brynja Hrafnkelsdottir*, Bjarni D. Sigurdsson, Edda S. Oddsdottir, Halldor Sverrisson, Gudmundur Halldorsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The broom moth Ceramica pisi, a native species in Iceland, has shown a marked expansion from south Iceland towards the north, concurrent with increasing temperatures. Winter temperatures have increased more than summer temperatures in Iceland and, in the present study, the hypothesis was that the winter warming has facilitated the range shift of C. pisi. Winter survival of pupae in Iceland was studied in the laboratory. Pupae were collected in the autumn of 2012 at five separate locations, then weighed and placed at temperatures from −6 to −18 °C. One month after the sub-zero treatments, the pupae were placed at room temperature and pupal emergence was recorded. No significant effect of sub-zero treatments on the survival of C. pisi pupae was found. The primary hypothesis of the present study was therefore rejected. The major factor affecting low temperature survival of C. pisi pupae, however, was their autumn weight. The response was sigmoid and the 5%, 50% and 95% likelihoods for winter survival were at 157, 274 and 393 mg autumn pupal mass, respectively. This finding indicates that factors other than winter temperature, such as summer available thermal budget for larval growth, may be a limiting factor to the spread of C. pisi in Iceland.

Original languageEnglish
Pages (from-to)219-226
Number of pages8
JournalAgricultural and Forest Entomology
Volume21
Issue number2
DOIs
Publication statusPublished - May 2019

Bibliographical note

Publisher Copyright:
© 2019 The Royal Entomological Society

Other keywords

  • broom moth
  • frost tolerance
  • geographical range shifts
  • global warming
  • pupal mass

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