Composition of diatom assemblages: how do we measure for assessment?

Description: The composition of diatom assemblages in rivers and lakes tell us about the condition (health, biotic integrity) of freshwaters. Yet, the way that we measure diatom assemblages may not be aligned with the information that we most need. One method in particular, a fixed count of 600 valves, has become firmly established. We need to take a closer look at the implication of use of this method. This presentation will discuss examination of the nature and structure of diatom assemblages and our current analysis protocol. I will present alternate protocols along with opportunity for questions and discussion.

Target Audience: This presentation will be directed at people interested in algal bioassessment and multi-metric indices in routine monitoring programs. The presentation will include explanations of technical information so that it is accessible to a general audience.