Restoration of Delta Streams: A Case History and Conceptual Model
Abstract
Delta streams, forming in the floodplains of large river systems, are widespread throughout the United States. Delta streams are most prevalent in the Mississippi Embayment, also referred to as the lower Mississippi River Basin. The alluvial flood-plain deposits are typically rich in organic material. Consequently, most delta streams have been altered through intense agricultural activities and flood control measures. Low water, excessive sedimentation in smaller delta streams, and the accumulation of pesticides such as DDT are the consequences of these anthropogenic disturbances resulting in dominance of tolerant fish species. Characteristics of tolerant fish assemblages include adaptations to low dissolved oxygen and high pulses of suspended solids, no direct requirements for clean, firm substrates for spawning, and ability to live in shallow, slackwater pools for extended periods. Although degraded delta streams are prevalent in the United States, attempts have been made to restore habitat conditions as part of ecosystem restoration or mitigation of flood control projects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2008
- Accession Number
- ADA477898
Entities
People
- Catherine E. Murphy
- David R Johnson
- Jan J. Hoover
- K. Jack Killgore
- Karen F. Myers
- Kent D. Parrish
Organizations
- Engineer Research and Development Center