GLIN==> Seminar - Ann Arbor, May 8 - TIME CORRECTION

[David Reid <david.reid@noaa.gov>]

Title:

Please note that the start time for the seminar by Stuart Ludsin on May 8
is being moved up to 10:00 a.m. to avoid a conflict with another seminar
at the University of Michigan.  The following seminar notice is a corrected
version of the one transmitted yesterday.   I apologize for any inconvenience
receiving a double posting may cause.

Dave Reid


- - - - - REVISED NOTICE- - - - -

SPONSORED BY THE NOAA GREAT LAKES SEMINAR SERIES 
    http://www.glerl.noaa.gov/news/seminars/ 
 
Title:  "A Changing Lake Erie Fish Community:          Unraveling the Mechanisms
Involved"" 
 
Speaker:  Dr. Stuart A. Ludsin, NOAA/GLERL, Ann Arbor, Michigan 
 
Date:  Thursday, May 8, 2003 
 
Time:  10:00 a.m.  (<=  NOTE TIME CHANGE) 
 
Where: 
GLERL Main Conference Room 
2205 Commonwealth Blvd. 
Ann Arbor, MI  48105 
For directions: 
     http://www.glerl.noaa.gov/facil/triptik.html 
 
Abstract: 
Owing to the combined effects of phosphorus abatement programs and Dreissenid 
introductions, Lake Erie has experienced dramatic changes in its physical 
(e.g., enhanced water clarity, reduced bottom anoxia in the west basin) and 
biological (e.g., reduced phytoplankton and zooplankton biomass; recovery 
of benthic mayflies) attributes. The effect of these changes on Lake Erie's 
fish communities, however, remains largely unknown. Herein, I use long-term 
(1969-2001) data on fish abundance and growth from Lake Erie's west and central 
basins, in combination with historical water chemistry and weather data, to
explore the potential effects of reduced system productivity on fish population 
and community dynamics. Specifically, I discuss gross trends in the fish community
structure (e.g., species richness and composition) in relation to phosphorus
availability, and the implications of these changes for important fisheries
(e.g., walleye Stizostedion vitreum). I also demonstrate how reduced phosphorus
availability seemingly has altered yellow perch (Perca flavescens) recruitment
mechanisms, causing a switch from dependence on temperature (1969-1986) to
a dependence on stochastic inputs of phosphorus from the watershed in recent
years. Ultimately, I discuss what these changes likely mean for both Lake
Erie user groups and resource management agencies.   
 
For more information, contact: 
    David Reid 
    734-741-201 
    David.Reid@noaa.gov   
 
 



-- 
David F. Reid, Ph.D.
U.S. Department of Commerce
National Oceanic and Atmospheric Administration
Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.
Ann Arbor, MI  48105-2945
Voice:	734-741-2019
FAX:	743-741-2055
GLERL home page:
   http://www.glerl.noaa.gov




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