Abstract:
:Developing eggs of Metrioptera roeseli HGB. have an obligate "embryonic" diapause in stage 23 and a facultative "initial" diapause in stage 4. Initial diapause is lacking when the ovipositing females are kept at long day photoperiod (LD 16/8), but is induced at LD 14/10 and LD 8/16. When natural light conditions are given in the laboratory, the females mostly lay diapausing eggs from the end of August onwards. In eggs without initial diapause, a larger number of embryos reach a stage, in which the embryonic diapause can be broken by chilling, only at favorable temperature (4 weeks at 24°C or 8 at 18°C) and in contact with water before the first winter. Thus, some individuals of a given population of M. roeseli have an annual, others a biennial life cycle. The variability in the duration of egg development is due to a photoperiodically induced, facultative initial diapause and to a possible quiescence caused by insufficient temperature and/or moisture.
journal_name
Oecologiajournal_title
Oecologiaauthors
Ingrisch Sdoi
10.1007/BF00396769subject
Has Abstractpub_date
1984-02-01 00:00:00pages
254-258issue
2eissn
0029-8549issn
1432-1939pii
10.1007/BF00396769journal_volume
61pub_type
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