Flight periods of aquatic insects from a Hong Kong forest stream I. Macronematinae (Hydropsychidae) and Stenopsychidae (Trichoptera)

摘要: The flight periods and direction of Stenopsyche angustata (Stenopsychidae), Macrostemum fastosum, M. lautum Polymorphanisus astictus (Macronematinae: Hydropsychidae) were investigated from May 1983 to June 1984. Light trap catches indicated that S. adults present throughout the year, whilst Macronematinae most numerous in not recorded during autumn winter. Temperature may determine period Hong Kong's seasonal tropical climate, but timing emergence reduce mortality late‐instar larvae pupae wet season spates would produce same temporal pattern. Female fastosum more than males light catches, apparently reflecting shorter adult life expectancy males. P. tended fly upstream; however upstream flights by females was apparent for only this species alone conformed colonization cycle prediction compensa...