CILER-GLERL Seminar on: Effects of increased water clarity on the catchability of fishes in Lake Erie due to dreissenid activity

Date:

Wednesday, January 4, 2012

Dr. Martin Stapanian, Research Ecologist

USGS-Great Lakes Science Center

Lake Erie Biological Station

10:30AM, Lake Superior Hall

Great Lakes Environmental Research Lab

4840 South State Road

Ann Arbor, MI 48108

Water clarity in western Lake Erie increased markedly by the early 1990s, a few years after the invasion of dreissenid mussels (Dreissena polymorpha and D. bugensis). In other systems, increased water clarity has resulted in greater trawl visibility, resulting in lower catchability of fishes. We examine a 45-year time series of bottom trawl data collected during daylight and nighttime. For the 4 most common fish species, nighttime catchability was significantly higher than daytime catchability following recorded increases in water clarity in 1991. For an economic species, yellow perch (Perca flavescens) trawling at night resulted in more conservative and reliable estimates of harvestable stock.

OR...

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PC-based attendees
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Macintosh®-based attendees
Required: Mac OS® X 10.5 or newer

Contact Us:

CILER
G110 Dana Building
440 Church Street
Ann Arbor, MI 48109-1041
Phone: (734) 763-3010

Vision and Mission:

CILER's vision is to enhance the quality of the Great Lakes and its related ecosystem services, through a partnership of universities, NOAA scientists, and other stakeholders.

CILER's mission includes: 1) translating research into productive outcomes through outreach and education; 2) facilitating productive interactions between scientists in the Great Lakes basin, with a primary focus on NOAA partnerships; 3) identifying and characterizing emerging areas of concern for the Great Lakes ecosystem, with applications to all coastal ecosystems; 4) providing a forum for better linking ecosystem responses, sustainable ecosystem services, and decision-making, and; 5) advancing our understanding of, and ability to predict, complex ecosystem processes, responses, and dynamics.