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The life cycle and growth of Sialis lutaria L. (Megaloptera) in a drainage channel under different methods of plant management
Author(s) -
BROOKER M. P.
Publication year - 1979
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1979.tb00567.x
Subject(s) - biology , standing crop , ecology , dry weight , drainage , body weight , life history , zoology , botany , agronomy , horticulture , biomass (ecology) , endocrinology
. 1. The life cycle of Sialis lutaria in two experimental reaches, one treated with the herbicides dalapon and 2,4‐D (Chemical) and the other subjected to a conventional method of plant control (Hand), of a drainage channel in Essex took about 2 years. 2. A maximum density of 815 m ‐2 was recorded and the density of each year class in both reaches generally decreased exponentially with age. 3. At certain times of the year the mean individual weight of each year class increased exponentially with age. Annual production was estimated to be 985 (Hand) and 1171 (Chemical) mg dry weight m ‐2 , with ratios of annual production to mean standing crop (P: b̄) of 1.6 and 1.8 respectively. 4. There was no evidence that the use of herbicides had any discernible effect on the mortality, growth or production of S.lutaria.