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In 2006, the Eastern Canadian Diatom Index (IDEC: Indice Diatomees de l’Est du Canada) was developed to monitor the biological integrity of streams and rivers in Eastern Canada. The fi rst version of the IDEC has been successfully used to evaluate the biological status of numerous sites. A new version of the index (IDEC 2.0) was recently developed to cover a larger geographic area that encompasses additional geological characteristics. IDEC 2.0 is now applicable for the biological assessment of streams in Quebec, Ontario, New Brunswick, Nova Scotia, and Prince Edward Island. Moreover, the approach used to defi ne the biological interpretation of the index values was revised. IDEC 2.0 presents ecologically meaningful differences among biological communities (ecological thresholds or class boundaries) based on diatom biotypes, providing a more relevant interpretation of the diatom community changes along the alteration gradient.

water quality research journal of canada

The Eastern Canadian Diatom Index (IDEC) Version 2.0: Including Meaningful Ecological Classes and an Expanded Coverage Area that Encompasses Additional Geological Characteristics