Ecomorphological Diversity of Lake Trout at Isle Royale, Lake Superior

AbstractFour Lake Trout Salvelinus namaycush morphs were identified from Isle Royale, Lake Superior; the morphs differed in shape, traits linked to feeding and locomotion, buoyancy, and physical habitat use. Lean, humper, and siscowet Lake Trout generally conformed to previous descriptions, and we report, for the first time, quantitative evidence of a fourth morph, previously described anecdotally as the “redfin.” Jackknife classification of individuals to morphs based on body shape were 94% correct. High variation within and low variation among morphs led to moderately low percent agreement among visual identifications and high uncertainty in Bayesian model groupings of morphs. Eight linear measures of phenotypic traits linked to feeding (i.e., head and eyes) and locomotion (i.e., fin lengths and caudal peduncle shape) varied among morphs, consistent with specialized adaptations for trophic and physical resource use. Habitat differed among morphs with leans being most abundant in the 0–50-m depth stratum...

• Publication year

  2014

• Venue

  Transactions of The American Fisheries Society

• Publication date

  2014-06-25

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1080/00028487.2014.900823
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• Sympatric Polymorphism in Lake Trout: The Coexistence of Multiple Shallow-Water Morphotypes in Great Bear Lake

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  2010cited by this paper
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  2010cited by this paper
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  2009cited by this paper
• Ontogenetic niche shifts and resource partitioning of lake trout morphotypes

  2009influential reference
• Harvest and Relative Abundance of Siscowet Lake Trout in Michigan Waters of Lake Superior, 1929-1961

  2008cited by this paper
• A Strategic Plan for the Rehabilitation of Lake Trout in Lake Erie, 2008-2020

  2008cited by this paper
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  2008cited by this paper
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  2008cited by this paper
• Diet and Prey Selection by Lake Superior Lake Trout during Spring, 1986–2001

  2007cited by this paper
• Morphological and Ecological Differences Between Shallow- and Deep-water Lake Trout in Lake Mistassini, Quebec

  2007influential reference
• Phenotypic Diversity of Lake Trout in Great Slave Lake: Differences in Morphology, Buoyancy, and Habitat Depth

  2006influential reference
• Diel vertical migration in the Lake Superior pelagic community. I. Changes in vertical migration of coregonids in response to varying predation risk

  2006cited by this paper
• Observations of Spawning Behaviour in Salmoninae: Salmo, Oncorhynchus and Salvelinus

  2005cited by this paper
• Speciation in reverse: morphological and genetic evidence of the collapse of a three‐spined stickleback (Gasterosteus aculeatus) species pair

  2005cited by this paper
• Evidence for Two Morphotypes of Lake Charr, Salvelinus Namaycush, from Great Bear Lake, Northwest Territories, Canada

  2004cited by this paper
• Geometric morphometrics for biologists : a primer

  2004cited by this paper
• Gill raker morphology and feeding ecology of two sympatric morphs of European whitefish (Coregonus lavaretus)

  2004cited by this paper
• Fish community change in Lake Superior, 1970-2000

  2003influential reference
• Genetic variation over space and time: analyses of extinct and remnant lake trout populations in the Upper Great Lakes

  2003cited by this paper
• FISH-COMMUNITY OBJECTIVES FOR LAKE SUPERIOR

  2003cited by this paper
• Evidence for resource polymorphism in the lake charr (Salvelinus namaycush) population of Great Bear Lake, Northwest Territories, Canada

  2003cited by this paper
• Sea Lamprey Abundance and Management in Lake Superior, 1957 to 1999

  2003cited by this paper
• The Isle Royale Folkefiskerisamfunn: Familier Som Levde Av Fiske- An Ethnohistory Of The Scandinavian Folk Fishermen Of Isle Royale National Park

  2002cited by this paper
• Buoyancy differences among two deepwater ciscoes from the Great Lakes and their putative ancestor

  2002cited by this paper
• Delineation of Sympatric Morphotypes of Lake Trout in Lake Superior

  2001cited by this paper
• Sustainability of the Lake Superior Fish Community: Interactions in a Food Web Context

  2000cited by this paper
• A stable isotope evaluation of the structure and spatial heterogeneity of a Lake Superior food web

  2000cited by this paper
• LAKE SUPERIOR A Case History of the Lake and its Fisheries

  2000cited by this paper
• Species succession and sustainability of the Great Lakes fish community

  1999cited by this paper
• Functional Convergence Among Pelagic Sculpins of Lake Baikal and Deepwater Ciscoes of the Great Lakes

  1999cited by this paper
• Evidence for buoyancy regulation as a speciation mechanism in Great Lakes ciscoes

  1998cited by this paper
• Otoliths Reveal a Diverse Age Structure for Humper Lake Trout in Lake Superior

  1996cited by this paper
• Progress Toward Lake Trout Restoration in Lake Michigan

  1995cited by this paper
• Restoration of Lake Trout in the Great Lakes: Challenges and Strategies for Future Management

  1995cited by this paper
• Environmental Biology of Fishes

  1995influential reference
• Resource polymorphisms in vertebrates.

  1995cited by this paper
• Review of Genetics of Lake Trout in the Great Lakes: History, Molecular Genetics, Physiology, Strain Comparisons, and Restoration Management

  1995cited by this paper
• Spawning Behavior of Lake Trout: Effects on Colonization Ability

  1995cited by this paper
• Osteological evidence of genetic divergence of lake trout (Salvelinus namaycush) in Lake Superior

  1994cited by this paper
• Character Release and Displacement in Fishes: A Neglected Literature

  1994cited by this paper
• Evidence of Spring Spawning Lake Trout in Lake Superior

  1993cited by this paper
• Food of salmonine predators in Lake Superior, 1981-87

  1993cited by this paper
• Standard Weight Equation for Lake Trout

  1993influential reference
• Intralacustrine speciation of Salvelinus namaycush in Lake Superior: An investigation of genetic and morphological variation and evolution of lake trout in the Laurentian Great Lakes.

  1993cited by this paper
• A review of differentiation in Great Lakes ciscoes

  1992cited by this paper
• Biology of fishes

  1986cited by this paper
• An empirical evaluation of several univariate methods that adjust for size variation in morphometric data

  1985cited by this paper
• Body Form, Locomotion and Foraging in Aquatic Vertebrates

  1984cited by this paper
• Retinal Resolving Power and Sensitivity of the Photopic System in Seven Haplochromine Species (Teleostei, Cichlidae)

  1983cited by this paper
• Decline of lake herring (Coregonus artedii) in Lake Superior: an analysis of the Wisconsin herring fishery, 1936-78

  1982cited by this paper
• Towards a constructional morphology of cichlid fishes (Teleostei, Perciformes)

  1982cited by this paper
• Stocks as chameleons: plasticity in gills rakers of coregonid fishes

  1981cited by this paper
• Native Lake Trout (Salvelinus namaycush) Stocks in the Canadian Waters of Lake Superior Prior to 1955

  1981influential reference
• Biology of Fishes

  1979cited by this paper
• Factors Affecting Abundance of Lake Herring (Coregonus artedii Lesueur) in Western Lake Superior

  1971cited by this paper
• Morphological Differences in Lake Superior Lake Char

  1970cited by this paper
• Fat content of the flesh of siscowets and lake trout from Lake Superior

  1965cited by this paper
• Food of Lake Trout in Lake Superior

  1965cited by this paper
• Age, Growth, Maturity, and Fecundity of Humper Lake Trout, Isle Royale, Lake Superior

  1965cited by this paper
• Status of the Deepwater Cisco Population of Lake Michigan

  1964cited by this paper
• Physical characteristics and chemical composition of two subspecies of lake trout.

  1962influential reference
• The reproduction of lake trout in southern Lake Superior

  1955cited by this paper
• Status of the lake trout fishery in Lake Superior

  1951cited by this paper
• The fisheries and fishery industries of the United States

  year unknowncited by this paper
• Superior fishing; or, The striped bass, trout, and black bass of the northern states. Embracing full directions for dressing artificial flies with the feathers of American birds; an account of a sporting visit to Lake By Robert B. Roosevelt ...

  year unknowninfluential reference
• American fishes a popular treatise upon the game and food fishes of North America, with especial reference to habits and methods of capture / by G. Brown Goode.

  year unknowncited by this paper

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  2026cites this paper
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  2025cites this paper
• Phenotypic variation among four Lake Trout morphs at six locations in Lake Superior

  2025cites this paper
• Trophic ecology and mercury bioaccumulation among Lake Superior lake charr (Salvelinus namaycush) ecotypes.

  2025cites this paper
• Stable isotope analysis of western Lake Superior predatory fishes, part one: Trophic niche overlap.

  2024cites this paper
• Origin of the Laurentian Great Lakes fish fauna through upward adaptive radiation cascade prior to the Last Glacial Maximum

  2024cites this paper
• Lake Superior fish community and fisheries, 2001–2022: An era of stability

  2024cites this paper
• Diversity in the internal functional feeding elements of sympatric morphs of Arctic charr (Salvelinus alpinus)

  2024cites this paper
• Food web structure of the Lake Superior fish community in 2021–2022

  2024cites this paper
• Which ecological factors influence the level of intraspecific diversity within post‐glacial fishes? A case study using Coregonus and Salvelinus

  2024cites this paper
• A hierarchical model of persistent and transient growth variation applied to Lake Superior lake trout

  2024cites this paper
• Synthesis of recent research and attributes of recovered lean Lake Trout populations in Lake Superior, 1993–2022

  2024cites this paper
• Life-history variation among four lake trout (Salvelinus namaycush) morphs at six locations in Lake Superior

  2024cites this paper
• The consequences of sea lamprey parasitism on lake trout energy budgets

  2023cites this paper
• Life on a seamount: Lake charr at Stannard Rock, Lake Superior, 2011–2015

  2023cites this paper
• Factors influencing egg thiamine concentrations of Lake Ontario lake trout: 2019–2020

  2023cites this paper
• A comparative analysis of osteocranium morphology in Lutjanus johnii (Bloch, 1792) and Lutjanus gibbus (Forsskal, 1775) inhabiting different habitats

  2023cites this paper
• Does hatchery rearing of lake trout affect their reproductive behavior in the wild?

  2022cites this paper
• The Influence of Life History on the Response to Parasitism: Differential Response to Non-Lethal Sea Lamprey Parasitism by Two Lake Charr Ecomorphs

  2022cites this paper
• Depth and temperature selection of lake charr (Salvelinus namaycush) ecotypes in Lake Superior revealed by popup satellite archival tags

  2022cites this paper
• Further evidence from common garden rearing experiments of heritable traits separating lean and siscowet lake charr (Salvelinus namaycush) ecotypes

  2022influential citation
• Probing for depth‐gradient diversification in the riverine‐spawning Dolly Varden: Insights from a recently discovered ecomorph assemblage

  2022cites this paper
• Movement Ecology and Behavior

  2021cites this paper
• Introduction. The Lake Charr: Biology, Ecology, Distribution, and Management

  2021cites this paper
• Reproduction

  2021cites this paper
• Ecological Diversity

  2021cites this paper
• Genetic Diversity

  2021cites this paper
• Thyroid-Mediated Metabolic Differences Underlie Ecological Specialization of Extremophile Salmonids in the Arctic Lake El’gygytgyn

  2021cites this paper
• Habitat

  2021cites this paper
• Trophic Ecology

  2021cites this paper
• Trophic transfer efficiency in the Lake Superior food web: assessing the impacts of non-native species.

  2021cites this paper
• Diet and trophic ecology of introduced salmonines at two south shore ports of Lake Superior, 2019

  2021cites this paper
• A chromosome‐anchored genome assembly for Lake Trout (Salvelinus namaycush)

  2021cites this paper
• Interaction among morphological, trophic and genetic groups in the rapidly radiating Salvelinus fishes from Lake Kronotskoe

  2020cites this paper
• Mapping of Adaptive Traits Enabled by a High-Density Linkage Map for Lake Trout

  2020influential citation
• Dietary versus nondietary fatty acid profiles of lake trout ecotypes from Lake Superior and Great Bear Lake: Are fish really what they eat?

  2020influential citation
• Interspecific differences in omega-3 PUFA and contaminants explain the most variance in suggested Great Lakes’ fish consumption when risks/benefits are considered together

  2020cites this paper
• Lipid levels and diet compositions in lake charr ecotypes at Isle Royale in northern Lake Superior

  2020cites this paper
• Temporal instability of lake charr phenotypes: Synchronicity of growth rates and morphology linked to environmental variables?

  2020cites this paper
• Differential Performance of Sympatric Pomoxis Species Is Explained by Habitat‐Linked Morphology

  2020cites this paper
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  2020cites this paper
• Trophic variation within a piscivorous lake trout morph from Great Bear Lake, Canada: The initial step toward ecological specialization?

  2019cites this paper
• Nonanadromous Life History Diversity of Rainbow Trout (Oncorhynchus mykiss)

  2019cites this paper
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  2019cites this paper
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  2019cites this paper
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  2019influential citation
• Factors Affecting Postrelease Survival of Coded‐Wire‐Tagged Lake Trout in Lake Michigan at Four Historical Spawning Locations

  2019cites this paper
• From top to bottom: Do Lake Trout diversify along a depth gradient in Great Bear Lake, NT, Canada?

  2018cites this paper
• Evolution of the Charrs, Genus Salvelinus (Salmonidae). 2. Sympatric Inner-lake Diversification (Ecological Peculiarities and Evolutionary Mechanisms Illustrated by Different Groups of Fish)

  2018cites this paper
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  2018cites this paper
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  2018cites this paper
• Investigating the extent of parallelism in morphological and genomic divergence among lake trout ecotypes in Lake Superior

  2017influential citation
• Reproduction of Lake Trout Morphotypes at Isle Royale in Northern Lake Superior

  2017cites this paper
• Early Feeding In Lake Trout Fry (salvelinus Namaycush) As A Mechanism For Ameliorating Thiamine Deficiency Complex

  2017cites this paper
• Investigating trophic ecology and dietary niche overlap among morphs of Lake Trout in Lake Superior

  2017influential citation
• Evidence of a remnant self-sustaining strain of lake trout in the Lake Michigan basin

  2017cites this paper
• New endemic deepwater charr morphs of the genus Salvelinus (Salmoniformes: Salmonidae) from Lake Kronotskoe, Kamchatka

  2017cites this paper
• Small-scale intraspecific patterns of adaptive immunogenetic polymorphisms and neutral variation in Lake Superior lake trout

  2017cites this paper
• Recreational Postrelease Mortality of Lake Trout in Lakes Superior and Huron

  2017cites this paper
• Use of Electricity to Sedate Lake Trout for Intracoelomic Implantation of Electronic Transmitters

  2017cites this paper
• Investigating genomic and phenotypic parallelism between piscivorous and planktivorous lake trout (Salvelinus namaycush) ecotypes by means of RADseq and morphometrics analyses

  2016cites this paper
• Environmental variability and intraspecies diversification in Arctic charr (Salvelinus alpinus)

  2016influential citation
• Differential physiological response to sea lamprey parasitism between lake trout (Salvelinus namaycush) morphotypes from Lake Superior

  2016cites this paper
• Loss of genetic diversity and reduction of genetic distance among lake trout Salvelinus namaycush ecomorphs, Lake Superior 1959 to 2013

  2016cites this paper
• Spawning site fidelity of wild and hatchery lake trout (Salvelinus namaycush) in northern Lake Huron

  2016cites this paper
• Life history variation among four lake trout morphs at Isle Royale, Lake Superior

  2016influential citation
• Life-history variation among four shallow-water morphotypes of lake trout from Great Bear Lake, Canada

  2016cites this paper
• If Arctic charr Salvelinus alpinus is ‘the most diverse vertebrate’, what is the lake charr Salvelinus namaycush?

  2016influential citation
• Challenge to the model of lake charr evolution: Shallow- and deep-water morphs exist within a small postglacial lake

  2016cites this paper
• Life history differences between fat and lean morphs of lake charr (Salvelinus namaycush) in Great Slave Lake, Northwest Territories, Canada

  2016cites this paper
• Striking Phenotypic Variation yet Low Genetic Differentiation in Sympatric Lake Trout (Salvelinus namaycush)

  2016influential citation
• Genetic and phenotypic variation along an ecological gradient in lake trout Salvelinus namaycush

  2016influential citation
• Foraging mechanisms of siscowet lake trout (Salvelinus namaycush siscowet) on pelagic prey

  2015influential citation
• The Lake Charr Salvelinus

  year unknowninfluential citation