Southern Research Station

Title: Effects of riffle length on the short-term movement of fishes among stream pools.

Author: Lonzarich, David George; Lonzrich, Mary Ruth Elger; Warren, Melvin L., Jr.

Date: 2000

Source: Canadian Journal of Fisheries and Aquatic Sciences. 57: 1508-1514.

Description: Recent research has suggested that the within-habitat dynamics of fish populations and assemblages can be affected by the spatial distribution of habitats within streams. In this study, we determined the extent to which pool isolation (length of riffles connecting adjacent pools) influenced fish movement in two Arkansas streams. We marked individuals from 12 pools assigned to two treatment categories: pools separated by long riffles (>50 m) and those separated by short riffles (<10 m). Repeatedly snorkeling pools for 3 days in 1995 and 1997, we discovered substantial emigration (>20 percent) and significant effects of riffle length. Total emigration from short-riffle pools was three times higher (29 percent) than movement from long-riffle pools (10 percent). Further, marked fish in short-riffle pools moved upstream and downstream with equal frequency, whereas fish in long-riffle pools moved twice as often downstream. Collectively, these results indicate significant effects of habitat spacing on short-term movement patterns by fish. In streams, where fish are distributed within a mosaic of habitats of varying quality, such movements may allow individuals to assess spatial variability in resource conditions (e.g., food, predators). Because land-use activities can alter habitat spacing, these findings have important implications for fish conservation in degraded streams.

Keywords: 

View and Print this Publication (147 KB)

Pristine Version:  An uncaptured or "pristine" version of this publication is available. It has not been subjected to OCR (Optical Character Recognition) and therefore does not have any errors in the text. However it is a larger file size and some people may experience long download times. The "pristine" version of this publication is available here:

View and Print the PRISTINE copy of this Publication (1.2 MB)

Publication Notes: 

• We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
• This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

 Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

Citation

Lonzarich, David George; Lonzrich, Mary Ruth Elger; Warren, Melvin L., Jr.  2000.  Effects of riffle length on the short-term movement of fishes among stream pools. .   Canadian Journal of Fisheries and Aquatic Sciences. 57: 1508-1514.