Age-0 walleye Sander vitreus display length-dependent diet shift to piscivory
نویسندگان
چکیده
منابع مشابه
Environmental DNA assays for the sister taxa sauger (Sander canadensis) and walleye (Sander vitreus)
Sauger (Sander canadensis) and walleye (S. vitreus) are percid fishes that naturally co-occur throughout much of the eastern United States. The native range of sauger extends into the upper Missouri River drainage where walleye did not historically occur, but have been stocked as a sport fish. Sauger populations have been declining due to habitat loss, fragmentation, and competition with non-na...
متن کاملDiet analysis of predator fish in Otsego Lake prior and subsequent to walleye (Sander vitreus) stocking; day vs. night, 2004
Otsego Lake (42o 41’N-70o’W) is the headwaters of the glacially-created Susquehanna River valley within the northern Appalachian Plateau. Historically considered oligo-mesotrophic, (Harman et al., 1997) the unauthorized introduction of alewives (Alosa pseudoharengus) in 1986 (Foster 1989) affected the lake, creating changes similar to those of eutrophy (Harman et al. 2002). Efficient planktivor...
متن کاملEffect of Diet Processing Method and Ingredient Substitution on Feed Characteristics and Survival of Larval Walleye, Sander vitreus
Two methods were developed for the production of larval fish diets. The first method, microextrusion marumerization (MEM), has been tested in laboratory feeding trials for many years and produces particles that are palatable and water stable. The second method, particle-assisted rotational agglomeration (PARA), produced diets that have lower density than diets produced by MEM. Each method was u...
متن کاملMorphological and trophic differentiation of growth morphotypes of walleye (Sander vitreus) from Lake Winnipeg, Canada
Ecologically related polymorphisms occur in many northern freshwater fish populations and are distinguished by alternate phenotypes consistently associated with differential use of habitats or resources. We tested for polymorphism in walleye (Sander vitreus (Mitchill, 1818)) in the south basin of Lake Winnipeg, where evidence suggests that ‘‘dwarf’’ and ‘‘normal’’ growth forms may coexist. Morp...
متن کاملGenetic connectivity and diversity of walleye (Sander vitreus) spawning groups in the Huron–Erie Corridor
Index words: Genetic connectivity Huron–Erie Corridor Microsatellites Mitochondrial DNA control region Sander vitreus Walleye The Huron–Erie Corridor (HEC) connects the upper and lower Great Lakes, providing key fish passage. A century of channelization, dredging, and pollution has led to habitat loss and declining fish numbers. Since 2004, the multi-agency HEC initiative augmented fish spawnin...
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ژورنال
عنوان ژورنال: Journal of Freshwater Ecology
سال: 2019
ISSN: 0270-5060,2156-6941
DOI: 10.1080/02705060.2018.1529637