Metabolism and cold tolerance of overwintering adult mountain pine beetles (Dendroctonus ponderosae): Evidence of facultative diapause?

[Display omitted] ► Overwintering mountain pine beetles have significantly suppressed metabolism. ► In midwinter, metabolic rates do not increase with phloem temperatures. ► Overwintering mountain pine beetles have significantly improved supercooling ability. ► Supercooling ability is tightly correl...

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Bibliographic Details
Published in:Journal of insect physiology 2012-06, Vol.58 (6), p.808-815
Main Authors: Lester, Jack D., Irwin, Jason T.
Format: Article
Language:English
Subjects:
Acclimatization
Animals
Cold hardening
Cold Temperature
Coleoptera - metabolism
Coleoptera - physiology
Dendroctonus
Dendroctonus ponderosae
Diapause
Metabolic suppression
Mountain pine beetle
Seasons
Statistics, Nonparametric
Supercooling point
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Summary:[Display omitted] ► Overwintering mountain pine beetles have significantly suppressed metabolism. ► In midwinter, metabolic rates do not increase with phloem temperatures. ► Overwintering mountain pine beetles have significantly improved supercooling ability. ► Supercooling ability is tightly correlated with the metabolic rate. ► Adult mountain pine beetles may have a winter diapause. We sought evidence for a distinct diapause in adult overwintering mountain pine beetles (Dendroctonus ponderosae Hopkins) by measuring metabolic rate and supercooling ability of field collected beetles throughout the year. Metabolic rates measured at 0, 5, and10°C declined significantly from October through November, then rose slowly, reaching levels as high as those recorded in October by late May. From December to February metabolic rates were not correlated with minimum weekly phloem temperatures (R2=0.0%, P=0.592), but were correlated with phloem temperatures as winter advanced to spring (R2=44.8%, P=0.010), a pattern consistent with progression through the maintenance and termination phases of diapause. Supercooling points were also significantly lower in winter compared to fall and spring (F(8,143)=32.6, P79% for all three temperatures). Dry mass declined linearly with winter progression (F(8,150)=8.34, P
ISSN:0022-1910
1879-1611
DOI:10.1016/j.jinsphys.2012.03.003