Attending this event?
Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 7, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

The conference schedule is hosted in SCHED which allows you to search within the schedule, and filter the schedule to show items only occurring on a certain date or within a track/symposia.
  • To view only a certain type of presentation or track, locate the heading "Filter By Type" in the navigation bar. As an example, try clicking on "T01: Fisheries: Great Lakes I".
  • The default view for the schedule is "Simple" which only shows the start time and title of the agenda item. Hover over the button that says "Schedule" to see the different view options. The "Expanded" option will show start and end times, room location, and session description, if there is one.
  • You can build your own schedule by creating a free account with SCHED by selecting "SIGN UP." Watch the "how-to" video to learn more about using Sched. 
  • PLEASE NOTE: Adding agenda items to your schedule through this app does not sign you up for a session. If an agenda item says "pre-registration required" or charges an additional fee, you need to add the item to your registration through the online registration system

View analytic
Monday, January 28 • 4:20pm - 4:40pm
(SYMPOSIA-04) Energy Pathways to Prey Fishes Across a Productivity Gradient: A Case-study in the Laurentian Great Lakes

Sign up or log in to save this to your schedule and see who's attending!

AUTHORS: Anne Scofield, Paris Collingsworth, Tomas Höök – Purdue University; David Bunnell, USGS Great Lakes Science Center; Aaron Fisk, University of Windsor Great Lakes Institute for Environmental Research; Tim Johnson, Ontario Ministry of Natural Resources; Brian Weidel, USGS Lake Ontario Biological Station

ABSTRACT: Natural stable isotope ratios of nitrogen (d<sup>15</sup>N) and carbon (d<sup>13</sup>C) have proven to be valuable tools for identifying basal energy sources for fish production and describing trophic complexity, but cross-lake comparisons of stable isotope data are often limited by challenges associated with standardizing study design and isotopic baselines. Over the past decade, a great number of resources have been invested to generate stable isotope data for the lower food web and prey fishes across all five of the Great Lakes through the bi-national Cooperative Science and Monitoring Initiative (CSMI), providing opportunities for robust cross-lake comparisons. In this study, we investigate differences in nearshore subsidies and trophic transfer efficiencies to prey fish across the productivity gradient observed in the Great Lakes, which range from eutrophic (western Lake Erie) to ultra-oligotrophic (e.g., Lake Superior). Using rainbow smelt as a case study, we examine the basal carbon sources and trophic positions of prey fish in the offshore regions of the five lakes. We also consider how differences in the densities on non-native species, such as dreissenid mussels, may affect resource distribution and energy flow to fishes. Quantifying how trophic structures in lakes differ across a productivity gradient can help elucidate the consequences of human actions such as nutrient management programs, fish stocking, and non-native species introductions.

Monday January 28, 2019 4:20pm - 4:40pm