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CONFERENCE SCHEDULE UPDATES & CHANGES: As a result of the prolonged government shutdown, we experienced a number of cancellations and changes to the schedule. Cancellations and changes are listed here (as of January 26, 2019). 
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Tuesday, January 29 • 6:00pm - 9:00pm
(CANCELLED) (P27) Testing of a Respiration Model for Hybridized Coregonines

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AUTHORS. Kevin Keeler, Five Rivers Services LLC; Zach Rekowski, Eastern Michigan University; Ellen George, Cornell University; Chuck Madenjian, USGS Great Lakes Science Center; Wendy Stott, Michigan State University

ABSTRACT. Hybridization is fairly common among some fish genera, yet it has been uncommon to create bioenergetics models for hybridized species. Coregonines utilize a wide range of habitats across the Great Lakes, and have undergone numerous historical perturbations but also recent restoration efforts. Two species with restoration interest, lake whitefish (Coregonus clupeaformis) and cisco (Coregonus artedi), contrast one another in habitat preference, population levels across lakes, and commercial availability, also hybridize. If each of these species populations continue to increase with population and habitat restoration efforts, then it is likely that additional individuals and habitat overlap will further allow for hybridization. While there are bioenergetics models for lake whitefish, and the deepwater coregonine bloater (Coregonus hoyi), there is no developed cisco bioenergetics model, let alone a hybridized model. A generalized coregonid model does exist, but still utilizes the same respiration components as bloater. Herein, we used a laboratory study to determine a new respiration model for hybridized cisco and lake whitefish. Gametes were collected from fishes in the Les Cheneaux Islands of Lake Huron during the fall of 2015. After incubation, hatching, and rearing of larvae, it was determined there was a hybridization cross of these species. Age-2 individuals underwent respiration trials in a 185-L swim chamber to determine oxygen consumption rate. Results of these trials could be utilized for comparison with pure cisco individuals while also furthering studies if hybridization becomes more common with restoration.

Tuesday January 29, 2019 6:00pm - 9:00pm EST
  Poster, Conservation Biology