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Influence of copper sulphate on the structure of the net of larvae of Hydropsyche (Insecta, Trichoptera)
Besch, W.K.; Schreiber, I.; Magnin, E. (1979). Influence of copper sulphate on the structure of the net of larvae of Hydropsyche (Insecta, Trichoptera). Ann. Limnol. 15(2): 123-138
In: Annales de Limnologie = International Journal of Limnology. Masson et Cie/EDP Sciences: Paris. ISSN 0003-4088; e-ISSN 2100-000X, more
Peer reviewed article  
Available in  Authors 
Keywords
    Chemical elements > Metals > Heavy metals
    Chemical elements > Metals > Transition elements > Heavy metals > Copper
    Pollution effects
    Taxa > Species > Indicator species
    Fresh water
Authors  Top 
  • Besch, W.K.
  • Schreiber, I.
  • Magnin, E.
Abstract
    Copper sulphate with an initial concentration as low as 125 g Cu/l in hard water adversely affects the capacity of the larvae of Hydropsyche to spin nets. The irregularity that is first apparent is the high number of thread-interruptions. At higher concentration, the number of meshes per net decreases. A typical anomaly of the toxic action of copper is the deposition of threads as cotton like harks instead of net tissues. The symmetry and regularity of the meshes in the catching area is only slightly affected by copper. This contrasts strikingly with the effects of a carbamate insecticide studied earlier. The primary site of the action of copper seems to be the silk gland and not the nervous system as is the case with the pesticide. Laboratory findings confirm those made in the field. Concentrations which severely impair net construction are prohibitive for occurrence in nature. The Hydropsyche -test requires only short test-times and simple equipment and yet gives information on long term effects.
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