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Survival Following Exposure to Subzero Temperatures and Respiration in Cold Acclimatized Larvae of Enallagma boreale (Odonata:Zygoptera)

Walter G. Duffy and Charles R. Liston
Freshwater Invertebrate Biology
Vol. 4, No. 1 (Feb., 1985), pp. 1-7
DOI: 10.2307/1467193
Stable URL: http://www.jstor.org/stable/1467193
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Survival Following Exposure to Subzero Temperatures and Respiration in Cold Acclimatized Larvae of Enallagma boreale (Odonata:Zygoptera)
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Abstract

Larvae of Enallagma boreale survived exposure to -1.0° C (53%) and -4.0° C (10%). Ability to survive was not related to rate of cooling or duration of exposure. Respiration rates ranged from 0.10 ml O2/g/h at -1.0° C to 0.92 ml O2/g/h at 30.0° C. At -1.0° C the respiratory quotient of larvae was 0.72, indicating lipids were being metabolized. Calculated metabolic costs for the overwintering period were 40.5% of total body calories. It is suggested that overwintering frozen into ice at moderately cold temperatures may be energetically advantageous.

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