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- Title
River-plume use during the pelagic larval stage benefits recruitment of a lentic fish.
- Authors
Reichert, Julie M.; Fryer, Brian J.; Pangle, Kevin L.; Johnson, Timothy B.; Tyson, Jeff T.; Drelich, Alison B.; Ludsin, Stuart A.
- Abstract
Similar to coastal marine systems. Lake Erie exhibits open-water river plumes that differ physicoehemically and biologieally from surrounding waters. To explore their importance to yellow perch (Perca flavescens) recruitment in westem Lake Erie, we tested two related hypotheses: (i) eontributions of larvae to the juvenile stage (when recruitment is set) would be greater from nutrient-rieb Maumee River plume (MRP) waters than from less-produetive non-MRP waters; and (ii) warmer temperatures and higher Zooplankton (prey) production in the MRP (versus non-MRP waters) would underiie this expected recruitment difference through "bottom-up" effeets on larval growth. Peak larval yellow pereh density was 10-fold and 5-fold less in the MRP than in non-MRP waters during 2006 and 2007. respectively. However, otolith mieroehemieal analyses demonstrated that disproportionately more juvenile reeruits emanated from the MRP than from non- MRP waters during both years. Although temperature and Zooplankton production were higher in the MRP than in non- MRP waters during both years, observed recruitment differences were not definitively linked to bottom-up effects. Topdown effects also appeared important, as high turbidity in the MRP may offer a survival advantage by reducing pr édation mortality on larvae. Our researeh highlights the need to better understand biophysical coupling in freshwater systems and demonstrates how stochastic tributary inputs can influence fish recruitment.
- Subjects
LAKE Erie; LARVAL physiology; FISH larvae; YELLOW perch; WATER temperature; ZOOPLANKTON; TURBIDITY
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2010, Vol 67, Issue 6, p987
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F10-036