Heritage strain and diet of wild young of year and yearling lake trout in the main basin of Lake Huron

Roseman, Edward F.; Stott, Wendylee; O’Brien, Timothy P.; Riley, Stephen C.; Schaeffer, Jeffery S.

doi:10.1016/j.jglr.2009.08.014

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…In smaller lakes, Lake Trout are conventionally thought to feed predominately on fish, with some invertebrates contributing to the diet in the spring and summer (Martin 1952;Jude et al 1987). In many instances when invertebrates are found in the diet, they are usually aquatic (Martin 1970;Madenjian et al 1998;Roseman et al 2009). However, Zimmerman et al (2007Zimmerman et al ( , 2009 found that in Mistassini and Great Slave Lakes, two other large and deep northern lakes, terrestrial insects contributed considerably to the diets of both deepand shallow-water morphs.…”

Section: Discussionmentioning

confidence: 99%

Fatty acid signatures and stomach contents of four sympatricLakeTrout: assessment of trophic patterns among morphotypes inGreatBearLake

Chavarie

Howland

Gallagher

et al. 2014

Ecology of Freshwater Fish

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Sympatric diversification in Lake Trout is generally linked to differences in habitat use (especially depth) as a result of foraging on different prey items. However, extensive sympatric divergence has taken place in the shallow waters (≤30 m) of Great Bear Lake, with multiple Lake Trout morphs varying in head and fin characteristics. To investigate diet partitioning as a potential explanatory mechanism for this diversification, we assessed trophic characteristics and relationships among four sympatric shallow‐water morphs of Lake Trout via analyses of fatty acids and stomach contents. Fatty acids and stomach contents both identified Lake Trout, Cisco and Mysis as key prey items in Lake Trout diets. Interestingly, terrestrial invertebrates were also seasonally important among morphs, reflecting temporal variability of available prey in this arctic lake. Some diet partitioning was observed among morphs; Morph 1 was characterised as a generalist, Morph 3 was more benthic‐oriented, and Morphs 2 and 4 were mainly pelagic feeders. Of the latter, Morph 4 was the most specialised, whereas Morph 2 exhibited alternative feeding tactics of benthic cannibalistic and pelagic piscivorous feeding. Our findings demonstrate that complementary dietary methods can elucidate habits of opportunistic feeders, a task that can often be problematic, given their complex and variable diets. Our results add new information and perspectives on the current model of Lake Trout differentiation, demonstrating niche partitioning based on benthic versus pelagic habitat use and generalist versus specialist feeding tactics.

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Section: Discussionmentioning

confidence: 99%

Fatty acid signatures and stomach contents of four sympatricLakeTrout: assessment of trophic patterns among morphotypes inGreatBearLake

Chavarie

Howland

Gallagher

et al. 2014

Ecology of Freshwater Fish

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“…With natural reproduction occurring at higher rates in recent years, a desire to assess foraging habits of wild-origin juvenile lake trout has emerged (Fitzsimons et al, 2010;Hanson et al, 2013;Lantry & Lantry, 2014). However, information on age-0 lake trout diet compositions in the Great Lakes is restricted to Lake Superior (Swedberg & Peck, 1984;Hudson, Savino & Bronte, 1995) and Lake Huron (Roseman et al, 2009). First exogenous diets of lake trout are composed of copepod and daphnid species, with the addition of chironomids and Mysis as gape size increases (Swedberg & Peck, 1984;Hudson et al, 1995;Roseman et al, 2009;Ladago, Marsden & Evans, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…However, information on age-0 lake trout diet compositions in the Great Lakes is restricted to Lake Superior (Swedberg & Peck, 1984;Hudson, Savino & Bronte, 1995) and Lake Huron (Roseman et al, 2009). First exogenous diets of lake trout are composed of copepod and daphnid species, with the addition of chironomids and Mysis as gape size increases (Swedberg & Peck, 1984;Hudson et al, 1995;Roseman et al, 2009;Ladago, Marsden & Evans, 2016). Mysis and chironomids are important prey for lake trout under 250 mm in length, a size when piscivory becomes dominant (Eschmeyer, 1956;Madenjian, Desorcie & Stedman, 1998;Beauchamp et al, 2006;Stafford et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Fatty‐acid profiles of juvenile lake trout reflect experimental diets consisting of natural prey

et al. 2016

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Summary It is relatively well‐known that fatty‐acid profiles of consumers reflect their diets. However, with fish, controlled studies that trace fatty‐acid profiles of natural prey into consumers are lacking. We asked whether lake trout (Salmonidae: Salvelinus namaycush) fatty‐acid profiles reflect diets at 4, 8 or 14 weeks after feeding began. We also evaluated if calibration coefficients were similar for each diet, a key assumption of quantitative fatty‐acid signature analysis (QFASA). In this study, juvenile lake trout were fed commercially available frozen diets of chironomids (Chironomidae: Chironomus spp.), copepods (Cyclopoida spp.), or Mysis (Mysidae: Mysis relicta) over a 14‐week period. Accurate classification of lake trout into a priori diet groups was attained after 8 weeks of feeding. Calibration coefficients were significantly different among diet groups, especially for lake trout that were fed chironomids, suggesting that diet‐specific modifications to fatty acids occurred. Chironomid‐fed lake trout grew significantly larger than others despite consuming prey that lacked long‐chain essential fatty acids. Furthermore, chironomid‐fed lake trout provide evidence for the conversion of 18:3n‐3 into longer chain n‐3 fatty acids. Our results call for additional studies to better understand how fatty acids reflect dietary origins prior to employing QFASA on wild freshwater fishes. QFASA could provide accurate diet estimates for freshwater fishes with low‐diversity diet compositions, if calibration coefficients for each predator–prey relationship are incorporated.

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“…Although traditional diet analysis continues to be a useful component in ecological studies due to its low cost and logistical ease (Andraso, 2005; Roseman et al , 2009), in recent years these data have been complemented with other more technologically advanced approaches, including fatty‐acid analysis, stable‐isotope analysis and DNA‐based diet determination techniques (Schmidt et al , 2009; Corse et al , 2010; Hardy et al , 2010). Fatty‐acid and stable‐isotope analyses can provide a broad picture of energy flow through the food web, but fail to give specific information on predator–prey interactions, which is often needed, particularly in more complex ecosystems (Guest et al , 2009; Elsdon, 2010; Hardy et al , 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The Laurentian Great Lakes represent the largest freshwater ecosystem in the world and support a large number of vulnerable and economically important fish species (Fuller et al , 1995). The Great Lakes ecosystems, however, have been modified by the introduction and spread of non‐native species (Munawar et al , 1999; Steinhart et al , 2004; Roseman et al , 2009; Gozlan et al , 2010; Stokstad, 2010) and climate change (Magnuson et al , 1990; Gozlan et al , 2010). Hence, it is imperative to develop rapid and accurate techniques to monitor and characterize species interactions in the Great Lake ecosystems as they change over time.…”

Section: Introductionmentioning

confidence: 99%

Utilization of stomach content DNA to determine diet diversity in piscivorous fishes

Carreón-Martı́nez

Johnson

Ludsin

et al. 2011

Journal of Fish Biology

117

110

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The objective of the study was to validate and apply DNA-based approaches to describe fish diets. Laboratory experiments were performed to determine the number of hours after ingestion that DNA could be reliably isolated from stomach content residues, particularly with small prey fishes (c. 1 cm, <0·75 g). Additionally, experiments were conducted at different temperatures to resolve temperature effects on digestion rate and DNA viability. The molecular protocol of cloning and sequencing was then applied to the analysis of stomach contents of wild fishes collected from the western basin of Lake Erie, Canada-U.S.A. The results showed that molecular techniques were more precise than traditional visual inspection and could provide insight into diet preferences for even highly digested prey that have lost all physical characteristics.

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Heritage strain and diet of wild young of year and yearling lake trout in the main basin of Lake Huron

Cited by 17 publications

References 42 publications

Fatty acid signatures and stomach contents of four sympatricLakeTrout: assessment of trophic patterns among morphotypes inGreatBearLake

Fatty acid signatures and stomach contents of four sympatricLakeTrout: assessment of trophic patterns among morphotypes inGreatBearLake

Fatty‐acid profiles of juvenile lake trout reflect experimental diets consisting of natural prey

Utilization of stomach content DNA to determine diet diversity in piscivorous fishes

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