Lower lethal temperature for adult male Diamesa mendotae Muttkowski (Diptera: Chironomidae), a winter-emerging aquatic insect

Raymond W. Bouchard, Mario A. Carrillo, Leonard C. Ferrington

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The supercooling point (SCP) and lower lethal temperature (LLT 50) of male adult Diamesa mendotae Muttkowski (Diptera: Chironomidae) were determined from field-collected individuals. SCP determined using surface-contact thermometry did not differ statistically from previously reported values for a previous generation of this species. The LLT50 was determined by exposing individuals to -10, -15, -20, -25, and -30°C for one minute. Mean survivorship was 96.7, 91.2, and 71.2% for tests at -10, -15, and -20°C, respectively. Exposure to -25 and -30°C resulted in 100% mortality in all tests. Results show that males of D. mendotae are freeze-intolerant with a mean SCP of -21.6°C which is only 0.1°C lower than its linear interpolated estimated LLT50 of -21.5°C. Our results confirm that a low SCP, rather than freeze tolerance, is a mechanism that facilitates emergence and adult activity of this species during winter conditions. The implications of SCP and LLT50 with regard to life cycle dynamics are discussed.

Original languageEnglish (US)
Pages (from-to)57-66
Number of pages10
JournalAquatic Insects
Volume28
Issue number1
DOIs
StatePublished - Mar 1 2006

Keywords

  • Chironomidae
  • Cold hardiness
  • Diamesa mendotae
  • Lower lethal temperature
  • Supercooling point
  • Winter activity

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