Abstract
Larvae of the caddisTrichostegia minor (Curtis) were collected from four woodland pools in The Netherlands, three of which are temporary, from August 1986 till June 1987. Eggs and larvae of this species proved to be very well adapted to drought, freezing, strongly fluctuating pH and alkalinity levels and prolonged oxygen deficit. The life cycle ofT.minor in a small woodland marsh overgrown byCalla palustris took one year. Adult flight period started at the end of May. Oviposition took place independent of water. Hatching of the eggs started in September and was probably induced by immersion. During the larval stage from September until May, 5 instars could be distinguished by the size of the head capsule. Growth of instars I, II and III during autumn was moderate. Most larvae overwintered as instar III or IV. Possibly there was a larval diapause during winter. In spring rapid growth to instar V took place prior to pupation. Growth rate, expressed as the increase of mean individual dry weight was highest from March to April (2.05±0.75% DW.m−2.d−1). In extremely shallow water growth in spring was initially more rapid compared to growth in deeper water. During winter the growth rate decreased to 0.038±0.071% DW.m−2.d−1. Net annual production based on the changes of momentary biomass was 183.2±31.7 mg DW.m−2.y−1 or 177.2±31.3 mg AFDW.m−2.y−1. Production loss during the winter season was 75.1±10.8 mg DW.m−2.y−1 or 72.3±10.6 mg AFDW.m−2.y−1.
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Van der Hoek, W.F., Cuppen, J.G.M. Life cycle and growth ofTrichostegia minor (Curtis) in temporary woodland pools (Trichoptera: Phryganeidae). Hydrobiological Bulletin 23, 161–168 (1989). https://doi.org/10.1007/BF02256733
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DOI: https://doi.org/10.1007/BF02256733