Fish depth distributions in the Lower Mississippi River

River Research and Applications
By:  and 

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Abstract

A substantial body of literature exists about depth distribution of fish in oceans, lakes and reservoirs, but less is known about fish depth distribution in large rivers. Most of the emphasis on fish distributions in rivers has focused on longitudinal and latitudinal spatial distributions. Knowledge on depth distribution is necessary to understand species and community habitat needs. Considering this void, our goal was to identify patterns in fish benthic distribution along depth gradients in the Lower Mississippi River. Fish were collected over 14 years in depths down to 27 m. Fish exhibited non-random depth distributions that varied seasonally and according to species. Species richness was highest in shallow water, with about 50% of the 62 species detected no longer collected in water deeper than 8 m and about 75% no longer collected in water deeper than 12 m. Although richness was highest in shallow water, most species were not restricted to shallow water. Rather, most species used a wide range of depths. A weak depth zonation occurred, not as strong as that reported for deep oceans and lakes. Larger fish tended to occur in deeper water during the high-water period of an annual cycle, but no correlation was evident during the low-water period. The advent of landscape ecology has guided river research to search for spatial patterns along the length of the river and associated floodplains. Our results suggest that fish assemblages in large rivers are also structured vertically. 

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Fish depth distributions in the Lower Mississippi River
Series title River Research and Applications
DOI 10.1002/rra.2652
Volume 30
Issue 3
Year Published 2014
Language English
Publisher Wiley
Contributing office(s) Coop Res Unit Atlanta
Description 13 p.
First page 347
Last page 359
Country United States
Other Geospatial Lower Mississippi River
Online Only (Y/N) N
Additional Online Files (Y/N) N