Accession Number : ADA132052

Title :   Environmental and Water Quality Operational Studies. Evaluating Changes in Dike Field Fishes with Community Information Indices.

Descriptive Note : Final rept. Apr 79-Sep 80,


Personal Author(s) : Polovino,Harry N ; Farrell,Michael P ; Pennington,C H

PDF Url : ADA132052

Report Date : Jun 1983

Pagination or Media Count : 50

Abstract : This study evaluates the relative performance of (1) binary similarity coefficients, (2) dissimilarity measures, and (3) diversity indices, calculated for three sampling methods, in detecting changes in fish communities associated with two dike fields on the Mississippi River. Dike field fish communities were sampled ans ecaluated for five hydrologic seasons, based on water temperature and flow velocities, and were found to be least similar during high-water low-temperature conditions. During the evaluation, the information derived from electroshocking was the most representative when compared with hoop net and seine information. Of the three families of community information measures, binary similarity coefficients proved to be the most sensitive indicators of change in dike field fish communities. It was further found that measures based on species presence/absence represent a valid alternative methor for characterizing change in community structure. This is especialy true when species abundance data are highly variable, which is the case in many fisheries assessments.

Descriptors :   *Fishes, Mississippi River, Dikes, Communities, Ecosystems, Sampling, Population, Variations, Statistical analysis

Subject Categories : Biology
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE