Survivorship and longevity of adult Diamesa mendotae Muttkowski, 1915 (Diptera: Chironomidae) at controlled, sub-freezing temperatures

Jane E. Mazack, Petra Kranzfelder, Alyssa M. Anderson, R. William Bouchard, Jim A Perry, Bruce Vondracek, Leonard C Ferrington

Research output: Contribution to journalArticlepeer-review

Abstract

Diamesa mendotae Muttkowski, 1915 is a winter-active species common in groundwater-buffered streams of Minnesota and Wisconsin. This species is capable of surviving under snow cover for at least 28 days. Field collections of adult D. mendotae were used to determine survivorship under long-term exposure to controlled sub-freezing conditions. Specimens were placed into a controlled temperature chamber at −5 °C, batches removed at weekly intervals, and subsequently held at 6 °C to determine survivorship and longevity. Our results indicate that overall survivorship is negatively related to treatment duration of sub-freezing treatment, individuals can survive sub-freezing temperatures for at least 70 days, with total longevity of 92 days. Additionally, males had a significantly higher rate of survivorship than females within treatments. Total longevity increased with treatment time, suggesting adult D. mendotae may survive long periods of below-freezing temperatures under natural conditions before mating, which may convey population-level advantages.

Original languageEnglish (US)
Pages (from-to)35-42
Number of pages8
JournalAquatic Insects
Volume36
Issue number1
DOIs
StatePublished - Jan 2 2014

Keywords

  • Chironomidae
  • Diamesa mendotae
  • Minnesota
  • USA
  • cold hardiness
  • longevity
  • ultra-cold stenotherms
  • winter dynamics

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