Effects of flow events and nutrient addition on stream periphyton and macroinvertebrates: an experimental study using flumes | Knowledge and Management of Aquatic Ecosystems

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Table 1

Timing of sampling and duration of pre-exposure of mesh bags and tiles (2014) or nutrient diffusing substrates (2015). The start of the flow event is set as day 0. Sampling 1 was performed before the onset of the flow event. MB = mesh bags, NDS = nutrient diffusing substrates.

Year	Round	Exposure of tiles/NDS in flumes	MB in stream	MB in flumes	Flow event	Sampling 2
2014	1& 2	−13	−6 to −3	−3	0–3	7
2015	1^*	−3	−6 to −3	−3	0–3	8
2015	2^**	−7	−11 to −7	−7	0–3	7

Pre exposure time had to be reduced compared to 2014 due to a partial collapse in the supporting structure of the flumes.

^**

Due to clogging of one of the valves, the experiment was restarted after one week, reducing the pre-exposure time of the NDS and extending the time the mesh bags were in the flumes prior to the flood.

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