Exam # 3 Study GuideBIOL 107 1st EditionRivers and Streams - Lotic Flowing Systems - Temperature Even - Dynamics (always changing) - Distinctive RegionsUpper Reaches - Steepest Gradient - Rapid Flow - Colder and highly oxygenated - Carries away nutrients Middle Reaches- Not flowing as rapidly - Silt deposits - Season flooding - Fish and insects breed here Lower Reaches- Gentle flow - Back and forth Lakes - Large - Deep - Top to bottom change - May affect local climate Ponds - Small - Shallow - Even temperature - Affected by local climate Lakes and Ponds - Standing Water - Freshwater - Salt Water - Multiple Origins - Have boundaries - Runoff - Acid rain - Zonation- Light - Temperature- Oxygen - Stratification plane Light- Littoral Zone - Profundal Zone- Benthic Zone Nutrient Levels - Oliototrophic- Mesotrophic-