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Figure 4.9 Procedures for Collecting a Macroinvertebrate Sample in a Rocky-bottom Stream




Figure 4.9 Procedures for Collecting a Macroinvertebrate Sample in a Rocky-bottom Stream
1. Approach the sample site from the downstream end. | 4. Disturb the substrate thoroughly with your feet. | Figure 4.9 Procedures for collecting a macroinvertebrate sample in a rocky-bottom stream Volunteers must follow set protocol to collect an unbiased sample. |
2. Position the net at a 45° angle with the bottom tight against the substrate. | 5. Remove the net with a forward scooping motion. | |
3. Dislodge macroinvertebrates by rubbing rocks thoroughly. | 6. Flush out the net with clean stream water. |