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Modelling adult survival in the laboratory of diapause and non‐diapause Colorado beetle Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) from Normandy, France
Author(s) -
BARTLETT PAUL W.,
MURRAY ALISTAIR W. A.
Publication year - 1986
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1986.tb01987.x
Subject(s) - diapause , leptinotarsa , biology , colorado potato beetle , pest analysis , population , weibull distribution , survivorship curve , zoology , larva , horticulture , ecology , demography , statistics , genetics , mathematics , cancer , sociology
SUMMARY Adult Leptinotarsa decemlineata from a culture originally from Normandy, France were kept in a controlled environment and fed daily on potato foliage. Dead beetles were scored and removed. Setting up the experiment was spread over 212 days and 1135 beetles were used. After 21 days each group was divided into two, some remained active and others were induced to diapause for 221 days before becoming active once again. Life span varied from 1 to 504 days and could be extended to 770 days by diapause. A model was derived which describes the mortality over time by assuming that a proportion of the population had an exponential distribution of lifetime and the remainder had a Weibull distribution which allowed for a hazard rate increasing with time. In the model 17% were short‐lived, having a mean lifetime of 8 days, and the remainder were long‐lived having a mean lifetime of 139.5 days. An exponential survivor function describes the post‐diapause cohort, which had a mean lifetime of 129 days after diapause.