Home Back Next Print Exit
Introduction How Rivers Run Stories Value Of A River What We Can Do
Connections of a River - Connectivity
Longitudinal disconnects (pg 9 of 9)

Longitudinal disconnects are not only physical. Persistent chemical or thermal pollution may create a barrier. Even an infestation of an invasive exotic species may disrupt the longitudinal connectivity of a stream.

Prolific zebra mussels in the middle reaches of the Mississippi attach to the shells of native mussels, devastating their populations. Zebra mussels filter fine organic particulates, including plankton, from the water and expel minerals as fecal or "pseudofecal" pellets. In effect, the mussels have disrupted part of the continuum of drifting plankton, transferring this energy supply to the streambed and reducing plankton food sources for other organisms


Next Page

Introduction
Flow
Shape
Connections
Description
Longitudinal
Lateral
Vertical
Temporal
Quality
Life
Summary
Home | References and Credits | Exit