||Influence of Sieve Mesh Size Selectivity on Benthic Invertebrate Indices of Eutrophication.
Mason, Jr., William T. ;
Lewis, Philip A. ;
Hudson, Patrick L. ;
||Environmental Monitoring and Support Lab.-Cincinnati, OH.
Particle size ;
Water pollution ;
Aquatic biology ;
Indicator species ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The selective retention of benthic invertebrates by sieves of various mesh sizes was demonstrated by Jonasson (1955, 1958) who reported that decreasing the mesh opening from 0.62 to 0.51 mm (effective decrease on one-third mesh opening area) resulted in samples with an average of 47% more Tanypus chironomid larvae. Sieve mesh size was also found to be highly selective toward oligochaetes of particular size ranges. Studies supported Jonasson's findings that the head capsule width of chironomid larvae governed their retention.