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Journal Article

Life Cycle, Production and Survival Rates of Ptychoptera paludosa (Diptera: Ptychopteridae)

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons57010

Wolf,  Beate
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons57026

Zwick,  Peter
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Wolf, B., & Zwick, P. (2001). Life Cycle, Production and Survival Rates of Ptychoptera paludosa (Diptera: Ptychopteridae). International Review of Hydrobiology, 86(6), 661-674.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C853-5
Abstract
Life cycle, survival and production of the univoltine midge Ptychoptera paludosa whose larvae live in fine sandy sediments were studied in a German stream (1989-1990). Growth of the 4th larval instar was linear. Adults emerge from May, for ca 8 weeks ( 1985-1990); emergence was 0.56 g dry weight m-2 lentic area (1990). Density decreased strongly only when larvae were young; except after an exceptional spate, numbers emerging were independent of discharge, Larval survival was ca 9%; only 10% of the potential offspring of the survivors actually appeared in the next generation. Secondary production (P) was 2.3 g ash free dry weight (AFDW) m-2 y-1, mean biomass (B) was 0.6 g AFDW m-2, i.e., the P/B ratio was 3.8.