The briefly colonial life of hatchlings of the net-spinning caddisfly 
Plectrocnemia conspersa

Hildrew, Alan G.; Wagner, Rüdiger

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The briefly colonial life of hatchlings of the net-spinning caddisfly Plectrocnemia conspersa

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Wagner, Rüdiger
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Hildrew, A. G., & Wagner, R. (1992). The briefly colonial life of hatchlings of the net-spinning caddisfly Plectrocnemia conspersa. Journal of the North American Benthological Society, 11(1), 60-68.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-C9BC-2

Abstract

Egg masses of the European net-spinning caddisfly Plectrocnemia conspersa were collected from a small stream, with the object of studying egg incubation and early (first seven days) larval behaviour. Egg masses contained 150-800 eggs (mean 440.2, 95%CL 75.6). Egg incubation period in the laboratory (6 days) was related to temperature (X degree C) by the equation ln(y) = 3.14 + 0.144 ln(x), taking 93 days at 6 degree C and 20 days at 18 degree C. Egg masses incubated in the field hatched as predicted by this equation. The length of individual eggs increased by an average of 17% during incubation. Emergence from the egg took about 30 min, and newly hatched larvae had yolk in their guts which lasted 24-30h, after which feeding began. Larvae took only live prey. In still water, larvae span silk, ventilated using abdominal undulations, turned in the net, and performed further miscellaneous movements.