Prior to routine larval and adult sampling, a survey of the entire habitat was conducted for midge fauna by collecting benthic samples with a 15 x 15 cm Ekman dredge from a boat at ca.
For temephos and Bti evaluations, 3 Ekman dredge samples were randomly collected from each plot immediately prior to treatment and at post-treatment d 3, 7, 14, 21, and 28 (temephos), and 2, 6, 13, 20, and 30 d (Bti).
APHA (1995) suggests sampling macrophytes by either the Manual Removal or Ekman dredge methods.
Nematoda was more abundant in both ecosystems through modified Ekman Dredge method.
The Nematoda total density was 4% and 8%, respectively, in the lotic and lentic ecosystems, the group percentage abundance was six times higher in lotic water bodies sampled by modified Ekman Dredge method.
On 28 January 1995, two specimens of Cordylophora lacustris were recovered from Ekman dredge
samples collected from the upper riverine portion of Livingston Reservoir in east Texas.
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Three sampling methods were used for each location during each sampling period, which included Ekman dredges
, dip netting, and black-light trapping.