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Variability in metabolic rate and gas exchange patterns of the Colorado potato beetle of winter and prolonged diapauses
Author(s) -
Ploomi Angela,
Kuusik Aare,
Jõgar Katrin,
Metspalu Luule,
Hiiesaar Külli,
Karise Reet,
Williams Ingrid H.,
Sibul Ivar,
Mänd Marika
Publication year - 2018
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/phen.12254
Subject(s) - diapause , colorado potato beetle , biology , leptinotarsa , overwintering , carbon dioxide , dormancy , pest analysis , ecology , botany , larva , germination
We compare standard metabolic rate (VCO 2 ) and gas exchange patterns in the Colorado potato beetle ( Leptinotarsa decemlineata Say) in winter diapause (i.e. lasting only one overwintering period) with those of beetles in prolonged diapause (i.e. diapause lasting 2 or 3 years). The length of diapause is estimated by the behaviour of the beetles: burrowing into soil as a sign of the beginning of diapause and emergence from the soil as the ending of diapause. Measurement with a flow‐through carbon dioxide (CO 2 ) infrared gas analyzer reveals that most beetles in winter or prolonged diapause display distinct discontinuous gas exchange cycles at 23 °C. Beetles with cyclic gas exchange and continuous breathing do not survive the winter. Beetles in prolonged diapause are characterized by a three‐ to five‐fold lower standard metabolic rates, longer discontinuous gas exchange periods and shorter CO 2 releases (open phase) than those in winter diapause.