We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Survival at low temperature of larvae of the pine processionary moth Thaumetopoea pityocampa from an area of range expansion.
- Authors
Hoch, Gernot; Toffolo, Edoardo Petrucco; Netherer, Sigrid; Battisti, Andrea; Schopf, Axel
- Abstract
1 Larvae of Thaumetopoea pityocampa (Lepidoptera: Notodontidae) develop throughout the winter, although their feeding activity and survival can be impaired by adverse climatic factors. The present study investigated the survival at low temperature of larvae originating from a population with range expansion in an alpine valley in Northern Italy. 2 The supercooling point of individually analysed larvae averaged at −7 °C. This value insufficiently described the cold hardiness of the larvae; 39% of the tested larvae were alive when returned to room temperature immediately after freezing. When larval colonies inside their nest were exposed to −17 °C for 1 h after gradual temperature decrease, survival was 70.4%. 3 Rearing of larvae in the laboratory at different day/night temperatures indicated an effect of cumulative chill injury on larvae. A logistic regression explained the relationship between negative thermal sum (h°C below 0 °C) received in the laboratory experiment and larval survival. A similar relationship was demonstrated between negative thermal sum and survival of larval colonies in the field. 4 In the laboratory experiment, some tested larvae were able to survive for up to 8 weeks without feeding depending on rearing temperature. As expected, feeding occurred only when larvae were reared at temperatures of 9 °C day/0 °C night. 5 We classify the larvae of T. pityocampa as being moderate freezing tolerant. The winter behaviour allows this species to track climate warming by a rapid expansion into those areas that become compatible with the insect’s development.
- Subjects
ITALY; THAUMETOPOEA; LOW temperatures; LARVAE; MOTHS; INSECTS; NOTODONTIDAE
- Publication
Agricultural & Forest Entomology, 2009, Vol 11, Issue 3, p313
- ISSN
1461-9555
- Publication type
Article
- DOI
10.1111/j.1461-9563.2009.00431.x