Ichthyoplankton abundance and variance in a large river system concerns for long-term monitoring

Holland-Bartels, Leslie E.; Dewey, Michael R.; Zigler, Steven J.

Abstract:

System-wide spatial patterns of ichthyoplankton abundance and variability were assessed in the upper Mississippi and lower Illinois rivers to address the experimental design and statistical confidence in density estimates. Ichthyoplankton was sampled from June to August 1989 in primary milieus (vegetated and non- vegetated backwaters and impounded areas, main channels and main channel borders) in three navigation pools (8, 13 and 26) of the upper Mississippi River and in a downstream reach of the Illinois River. Ichthyoplankton densities varied among stations of similar aquatic landscapes (milieus) more than among subsamples within a station. An analysis of sampling effort indicated that the collection of single samples at many stations in a given milieu type is statistically and economically preferable to the collection of multiple subsamples at fewer stations. Cluster analyses also revealed that stations only generally grouped by their preassigned milieu types. Pilot studies such as this can define station groupings and sources of variation beyond an a priori habitat classification. Thus the minimum intensity of sampling required to achieve a desired statistical confidence can be identified before implementing monitoring efforts.

Genre:

Article

ProdID:

70006927

Citation Author:

Holland-Bartels, Leslie E.; Dewey, Michael R.; Zigler, Steven J.

Citation Contributing Office:

Upper Midwest Environmental Sciences Center

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

Citation Keywords:

Citation Language:

English

Citation Larger Work Title:

Regulated Rivers: Research & Management

Citation LatN:

Citation LatS:

Citation LonE:

Citation LonW:

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

13 p.

Citation Projection:

Citation Public Comments:

None

Citation Publisher:

Wiley

Citation Series:

Citation Series Code:

Citation Series Number:

Citation Search Results Text:

Ichthyoplankton abundance and variance in a large river system concerns for long-term monitoring; 1995; Article; Journal; Regulated Rivers: Research & Management; Holland-Bartels, Leslie E.; Dewey, Michael R.; Zigler, Steven J.