2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | PROCESSING LIVE MACROINVERTEBRATES IN THE FIELD MAY BE MORE EFFICIENT, EDUCATIONAL, AND ENGAGING | Virtual Platform

PROCESSING LIVE MACROINVERTEBRATES IN THE FIELD MAY BE MORE EFFICIENT, EDUCATIONAL, AND ENGAGING

Benthic macroinvertebrate studies typically rely on preserving samples for later lab identification, reducing field-collection time but extending lab-processing time. Dead invertebrates become harder to detect, particularly in samples with excess detritus, lose distinguishing coloration and behavior, and are frequently damaged during preservation and transport. Here, we compare the efficiency and accuracy of processing macroinvertebrate samples in the field versus lab. In Yellowstone National Park, we sampled macroinvertebrates from eight headwater-streams. In the field, we used two-stage subsampling, the same observers measured and identified organisms (typically to Family-level), and identifications were later lab-verified. A subset of samples were solely lab-processed. Both field and lab-processing were timed to compare efficiency and accuracy. In general, field-processing was more efficient, and biomass estimates and identification accuracies were similar. Some challenging taxa were misidentified, highlighting the importance of vouchering. Studying preserved specimens alone abstracts taxonomy from context especially important to ecological learning by students. Additionally, field processing saves resources (e.g. EtOH, plastic bags) and minimizes invertebrate sacrifices. Subsequent, fine-level taxonomy beyond what is possible streamside is often necessary, but our findings suggest dedicating more time to field-processing may be more efficient, educational, and engaging.

Biodiversity
Monitoring
Stream

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Presenters/Authors

Jeremy Brooks (), Idaho State University, broojer2@isu.edu;