A versatile and economical method for collecting macroinvertebrates using Hester-Dendy multiplate samplers.

We present an inexpensive, versatile, and robust mounting system for Hester-Dendy (HD) multiplate samplers that are useful in aquatic biological studies and freshwater biomonitoring programs. Detailed instructions are provided outlining the construction and deployment of a concrete block system featuring threaded anchors for screwing in HD columns in a vertical position. Additionally, eye bolts provide a central attachment point for cabling the block securely to the stream or river bank, and for attachment of a buoy or physiochemical data logger if desired. All the components of the block system are inexpensive, readily available, and assembled with no special skills required. The system offers superior ease-of-use and a more standardized sampling device compared to other methods.

Trichoptera of Canada.

Trichoptera, or caddisflies, are common members of freshwater ecosystems as larvae and are important indicators of aquatic system health. As such, the species are relatively well studied, with keys available for larvae and adults of many of the taxa occurring in Canada. The number of species recorded from Canada since 1979 (Wiggins 1979) has increased from 546 to 636, an increase of 16.4%. Of those species newly recorded, 17 represent newly described taxa since 1979. Taking into consideration the species likely to be subsequently found in Canada based on records in adjacent parts of the United States and results from DNA barcoding, an estimated 129-181 species remain to be documented in Canada.