Document Type

Article

Department/Program

Virginia Institute of Marine Science

Publication Date

1-2018

Journal

Canadian Journal of Fisheries and Aquatic Sciences

Volume

75

Issue

1

First Page

36

Last Page

46

Abstract

Long-term monitoring data were used to test whether the invasion of zebra mussels (Dreissena polymorpha) in the Hudson River Estuary in 1991 altered the influence of density dependence and environmental conditions on life-stage transitions, growth, and partial migration in white perch (Morone americana). During the post-invasion period (1992-2013), we estimated standing stocks of white perch eggs, yolk-sac larvae (YSL), post-yolk-sac larvae (PYSL), young-of-the-year (YOY), and adults as well as indices of YOY growth and spatial distribution. A series of linear and nonlinear functions were employed to model life-stage transitions, while the effects of six environmental and density-dependent variables on YOY growth and partial migration were quantified. Comparisons to pre-invasion observations (1974-1991) indicated that egg-YSL, PYSL-YOY, and YOY-yearling transitions changed significantly after the invasion, while PYSL abundance developed a stronger negative effect on YOY growth. The PYSL-YOY transition became more sensitive to density dependence and freshwater flow from 1992 to 2013, which is consistent with diminished abundance and increased environmental sensitivity of the forage base in the Hudson River Estuary reported after the zebra mussel invasion.

DOI

10.1139/cjfas-2016-0455

Keywords

Bass Morone-Saxatilis; Zebra Mussel Invasion; Long-Term Changes; Regime Shifts; Life-History; North-Sea;

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