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Introduction How Rivers Run Stories Value Of A River What We Can Do
Connections of a River - Connectivity
Longitudinal: River Continuum Concept (pg 3 of 9)

In the midreaches (fourth through sixth order), the gradient decreases. The river has fewer rapids and falls. The stream is too wide to remain shaded. Sunlight reaches the water, allowing the growth of aquatic plants. Leaf fall is proportionately less important as a source of energy. Insects feed on algae and living plants.

With a lower proportion of groundwater and high proportion of runoff, stream temperatures are warmer, with greater fluctuations daily and seasonally. As the size of the stream grows, so does the diversity of invertebrates and fish. In the east and upper midwest these streams often support smallmouth bass or rock bass, redhorse, walleye, northern pike, catfish, and carp.


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Flow
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Longitudinal
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Vertical
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