The Ecological Role of Troutperch Percopsis Omiscomaycus In
Journal of Applied Ichthyology J. Appl. Ichthyol. 29 (2013), 416–424 Received: April 9, 2012 © 2012 Blackwell Verlag GmbH Accepted: June 1, 2012 ISSN 0175–8659 doi: 10.1111/jai.12023 A trophic bottleneck?: The ecological role of trout-perch Percopsis omiscomaycus in Saginaw Bay, Lake Huron By C. E. Blouzdis1, L. N. Ivan1,*, S. A. Pothoven2, C. R. Roswell1, C. J. Foley1,3 and T. O. Ho¨o¨k1,3 1Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA; 2National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, Muskegon, MI, USA; 3Illinois-Indiana Sea Grant, Purdue University, West Lafayette, IN, USA Summary high abundances, and taxonomic distinctness, trout-perch are Trout-perch are abundant in many North American aquatic relatively understudied, and their role in food webs of the systems, but the ecological roles of trout-perch as predators, Laurentian Great Lakes is not well-understood. competitors and prey remain relatively understudied. To eluci- Past studies demonstrate that trout-perch feed primarily on date the ecological role of trout-perch in Saginaw Bay (Lake benthic invertebrates (Ogle et al., 1995; Nelson and Dick, Huron, North America), the spatial and temporal diet compo- 2002), although they also consume fish eggs and, occasionally, sition was quantified and the frequency of occurrence of trout- small fish (Nelson and Dick, 2002). Therefore, under resource perch in diets of piscivorous walleye and yellow perch was limitations trout-perch may compete with other benthically evaluated. From May through November 2009–2010, trout- feeding fishes. For example, in Lake Superior trout-perch may perch and their potential predators and prey were collected share feeding patterns with ruffe Gymnocephalus cernua, monthly from five sites in Saginaw Bay using bottom-trawls.
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