Cold hardiness in the adults of two winter stonefly species: Allocapnia granulata (Claassen, 1924) and A. pygmaea (Burmeister, 1839) (Plecoptera: Capniidae)

Raymond W. Bouchard, Brian E. Schuetz, Leonard C. Ferrington, Stephen A. Kells

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The supercooling points (SCPs) and lower lethal temperatures (LLT50) of adult males and females of Allocapnia granulata and A. pygmaea (Plecoptera: Capniidae) were determined for field-collected individuals from streams in central Minnesota (USA). Mean SCPs (±SE) for A. granulata females was -13.15°C (±0.44) and -11.95°C (±0.47) for A. pygmaea females. Using probit analysis, the LLT50 (±SE) for females of A. granulata was determined to be -8.50°C (±0.63) and -9.26°C (±0.57) for A. pygmaea. Mean LLT50s were higher than their respective SCPs, indicating that these species are not freeze tolerant and may be chill susceptible. SCPs for both Allocapnia species were lower than many other winter-emerging species, but were considerably higher than a species of Chironomidae (Diamesa mendotae: -21.6°C) often found in the same habitats. These results indicate that these Allocapnia species are moderately cold hardy, but are not well suited to mid-winter temperatures in Minnesota.

Original languageEnglish (US)
Pages (from-to)145-155
Number of pages11
JournalAquatic Insects
Volume31
Issue number2
DOIs
StatePublished - Jun 1 2009

Keywords

  • Cold hardiness
  • Lower lethal temperature
  • Supercooling point
  • Winter activity

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