26. Zonation: Different areas of the riparian microhabitat Zone 2: High Water Area Zone 1: River Bed Zone 3: Rocky Bar Zone 4: Sandy Bank Zone 5: Vegetated Area
41. Food Web Mayflies In spring, water temperature needs to be in the low 40s. Peak hatches occur when the water temps hit 46 degrees and up. In summer, especially evenings, water temp needs to be in the 60 degree minimum. For fall mayflies, peak hatches will happen when the water temp is over 46 degrees. Egg development is highly dependent upon a narrow temperature range for survival, with maximum hatching rates at 15.8 °C and 1.9 - 5.2 °C for Other predators include birds, spiders, dragonflies, damselflies, trout, and insectivorous biting midges (McCafferty 1998). Below the surface, more activity takes place. 90% of the food trout eat is taken below the surface. That generally means nymphs.