Environmental correlates of upstream migration of yellow-phase American eels in the Potomac River drainage

Transactions of the American Fisheries Society
By:  and 

Links

Abstract

Assessing the relationships between upstream migration and environmental variables is important to understanding the ecology of yellow-phase American Eels Anguilla rostrata. During an American Eel migration study within the lower Shenandoah River (Potomac River drainage), we counted and measured American Eels at the Millville Dam eel ladder for three periods: 14 May–23 July 2004, 7–30 September 2004, and 1 June–31 July 2005. Using generalized estimating equations, we modeled each time series of daily American Eel counts by fitting time-varying environmental covariates of lunar illumination (LI), river discharge (RD), and water temperature (WT), including 1-d and 2-d lags of each covariate. Information-theoretic approaches were used for model selection and inference. A total of 4,847 American Eels (19–74 cm total length) used the ladder during the three periods, including 2,622 individuals during a 2-d span following a hurricane-induced peak in river discharge. Additive-effects models of RD + WT, a 2-d lag of LI + RD, and LI + RD were supported for the three periods, respectively. Parameter estimates were positive for river discharge for each time period, negative for lunar illumination for two periods and positive for water temperature during one period. Additive-effects models supported synergistic influences of environmental variables on the upstream migration of yellow-phase American Eels, although river discharge was consistently supported as an influential correlate of upstream migration.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Environmental correlates of upstream migration of yellow-phase American eels in the Potomac River drainage
Series title Transactions of the American Fisheries Society
DOI 10.1080/00028487.2012.754788
Volume 142
Issue 2
Year Published 2013
Language English
Publisher Taylor & Francis
Contributing office(s) Coop Res Unit Leetown
Description 9 p.
First page 483
Last page 491
Country United States
State Maryland
Other Geospatial Millville dam
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page