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

Happel, Austin; Stratton, Logan; Pattridge, Robert; Rinchard, Jacques; Czesny, Sergiusz J.

doi:10.1111/fwb.12786

Cited by 27 publications

(21 citation statements)

References 59 publications

(122 reference statements)

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“…Non-metric multidimensional scaling (nMDS; Euclidean distances) of fatty acid profiles from steelhead trout prior to experimental feeding ( (Happel, Stratton, Pattridge, et al, 2016;Rosen & Tollit, 2012). Non-metric multidimensional scaling (nMDS; Euclidean distances) of fatty acid profiles from steelhead trout prior to experimental feeding ( (Happel, Stratton, Pattridge, et al, 2016;Rosen & Tollit, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Within published studies with lake trout we illustrate this by comparing a range of DHA proportions spanning 12.5% in lake trout that were fed invertebrates (Happel, Stratton, Pattridge, et al, 2016), to a reduction in the range of DHA values as lake trout shift from invertebrate diets to piscivory in L. Michigan (Happel et al, 2018), a range spanning 3.9% in adult lake trout caught in L. Ontario (Happel, Pattridge, Walsh, & Rinchard, 2017), and a range spanning 4.25% in the data presented herein on a species fed solely on fish prey items such as adult lake trout. Similar conclusions were made by Sushchik, Gladyshev, Kalachova, Makhutova, and Ageev (2006) when fatty acids of benthic prey and their predator, grayling (Thymallus arcticus), were compared.…”

Section: Discussionmentioning

confidence: 99%

“…Although we calculated and presented CCs, our modelling routines avoided the use of CCs. Other studies have shown CCs to vary by each predator-prey interaction (Happel, Stratton, Pattridge, et al, 2016;Rosen & Tollit, 2012). Current practice is to use predators fed known diets as a library from which other samples can be compared against (Galloway et al, 2015;Happel, Stratton, Kolb, et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Such models typically require a means of mapping predators directly to the biochemical signatures of potential prey species (Galloway et al, 2015;Iverson et al, 2004;Parnell et al, 2010). In contrast, several studies have shown that how fatty acid profiles reflect a diet, often assessed using calibration coefficients (CC), is dependent on what that diet was composed of (Happel, Stratton, Pattridge, Rinchard, & Czesny, 2016;Lazzarotto et al, 2015;Murray, Hager, Tocher, & Kainz, 2014;Rosen & Tollit, 2012;Taipale, Kainz, & Brett, 2011). In contrast, several studies have shown that how fatty acid profiles reflect a diet, often assessed using calibration coefficients (CC), is dependent on what that diet was composed of (Happel, Stratton, Pattridge, Rinchard, & Czesny, 2016;Lazzarotto et al, 2015;Murray, Hager, Tocher, & Kainz, 2014;Rosen & Tollit, 2012;Taipale, Kainz, & Brett, 2011).…”

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confidence: 99%

“…With stable isotope ratios, fractionation appears relatively predictable across diet compositions for a given predator (Parnell et al, 2010;Post, 2002). In contrast, several studies have shown that how fatty acid profiles reflect a diet, often assessed using calibration coefficients (CC), is dependent on what that diet was composed of (Happel, Stratton, Pattridge, Rinchard, & Czesny, 2016;Lazzarotto et al, 2015;Murray, Hager, Tocher, & Kainz, 2014;Rosen & Tollit, 2012;Taipale, Kainz, & Brett, 2011). Current models that use fatty acids to estimate prey items in diets require controlled feeding trials of each predator-prey species pairing for increased accuracy and resolution (Galloway, Eisenlord, Dethier, Holtgrieve, & Brett, 2014;Happel, Stratton, Kolb, et al, 2016).…”

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confidence: 99%

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Fatty acids differentiate consumers despite variation within prey fatty acid profiles

et al. 2019

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Techniques that biochemically trace foraging habits of predators rely on the assumption that intra‐specific variation in prey species is smaller than variation among them. At the same time, these techniques often show that diets can induce drastic changes in the biochemical profiles of prey species, especially across different ecosystems. We tested if intra‐specific variation in fatty acid profiles of prey species added enough noise to confound quantitative fatty acid signature analysis (QFASA) using a controlled feeding experiment. Steelhead trout (Oncorhynchus mykiss) were fed either alewife (Alosa pseudoharengus) or round goby (Neogobius melanostomus) from either Lake Ontario or Cayuga Lake for a period of 8 weeks. Fatty acid profiles were significantly different between prey species and between lake of origin within each species. Differences in fatty acid profiles of steelhead trout strongly reflected prey species differences, whereas differences related to prey origin (lakes) were noted at a much lesser extent. QFASA performed remarkably well given the differences observed between the lakes prey originated from. Our results indicate that QFASA models for steelhead trout are probably not specific to one lake, and could provide estimates for other freshwater systems where alewife and round goby serve as the primary forage.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Fatty acids differentiate consumers despite variation within prey fatty acid profiles

et al. 2019

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Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use

Chavarie

Howland

Harris

et al. 2021

Ecology and Evolution

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In a polyphenic species, differences in resource use are expected among ecotypes, and homogeneity in resource use is expected within an ecotype. Yet, using a broad resource spectrum has been identified as a strategy for fishes living in unproductive northern environments, where food is patchily distributed and ephemeral. We investigated whether specialization of trophic resources by individuals occurred within the generalist piscivore ecotype of lake trout from Great Bear Lake, Canada, reflective of a form of diversity. Four distinct dietary patterns of resource use within this lake trout ecotype were detected from fatty acid composition, with some variation linked to spatial patterns within Great Bear Lake. Feeding habits of different groups within the ecotype were not associated with detectable morphological or genetic differentiation, suggesting that behavioral plasticity caused the trophic differences. A low level of genetic differentiation was detected between exceptionally large‐sized individuals and other piscivore individuals. We demonstrated that individual trophic specialization can occur within an ecotype inhabiting a geologically young system (8,000–10,000 yr BP), a lake that sustains high levels of phenotypic diversity of lake trout overall. The characterization of niche use among individuals, as done in this study, is necessary to understand the role that individual variation can play at the beginning of differentiation processes.

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Content of highly unsaturated fatty acids in fish from rivers of contrasting temperature

Sushchik

Zuev

Kalachova

et al. 2018

River Research & Apps

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Contents of highly unsaturated long-chain fatty acids of omega-3 family (HUFA); eicosapentaenoic acid (EPA; 20:5n-3); and docosahexaenoic acid (DHA; 22:6n-3) are the principal indicators of the nutritive quality of fish for humans. Effects of environmental factors, first of all water temperature, on EPA and DHA contents in fish tissue are not currently completely understood. To reveal the putative effect of water temperature, fatty acid composition and contents were studied for 6 fish species, inhabiting the cold waters of the Yenisei River (Siberia, Russia) downstream of a dam (hypolimnetic release from reservoir) and its adjacent warm water tributaries (the Mana River and the Kacha River). It was hypothesized that (a) fish species from the cold river would have higher HUFA contents than fish from the warm rivers and (b) temperature would be negatively correlated with HUFA content in fish species.Using gas chromatography-mass spectrometry, distinct species-specific fatty acid profiles were observed, whereas contents of the essential fatty acids, EPA and DHA, in fish species from the cold Yenisei River were in general similar to that from warm tributaries. Thus, in contrast to the first hypothesis, phylogenetic factors overweighed the effect of water temperature and food (benthic invertebrate) composition, on fatty acid composition and HUFA content in fish. For the second hypothesis, for the 2 species inhabiting both cold and warm rivers, only one had higher EPA and DHA content at lower temperatures. Consequently, the response of EPA and DHA content in fish tissue to temperature variations may be species-specific.

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

Cited by 27 publications

References 59 publications

Fatty acids differentiate consumers despite variation within prey fatty acid profiles

Fatty acids differentiate consumers despite variation within prey fatty acid profiles

Among‐individual diet variation within a lake trout ecotype: Lack of stability of niche use

Content of highly unsaturated fatty acids in fish from rivers of contrasting temperature

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