Fatty acid accumulation in feeding types of a natural freshwater fish population

Scharnweber, Kristin; Chaguaceda, Fernando; Eklöv, Peter

doi:10.1007/s00442-021-04913-y

Cited by 25 publications

(25 citation statements)

References 65 publications

(103 reference statements)

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“…A potential explanation is that sympatric brown trout has adapted to the lower dietary intake of n-3 LC-PUFA by increasing retention and/or internal synthesis of DHA (Murray et al 2014). Such adaptation has been observed in populations of three-spined stickleback (Ishikawa et al, 2021) and European perch (Scharnweber et al, 2021) foraging on low-quality prey from littoral lake habitat that is deprived of n-3 LC-PUFA. Similarly, tree swallows have been shown to increase synthesis of DHA when consuming n-3 LC-PUFA deprived terrestrial macroinvertebrates (Twining et al, 2018).…”

Section: Discussionmentioning

confidence: 75%

Linking omega-3 polyunsaturated fatty acids in natural diet with brain size of wild consumers

et al. 2022

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Omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) are key structural lipids and their dietary intake is essential for brain development of virtually all vertebrates. The importance of n-3 LC-PUFA has been demonstrated in clinical and laboratory studies, but little is known about how differences in availability of n-3 LC-PUFA in natural prey in uence brain development of wild consumers. The numerous consumers foraging on the interface of aquatic and terrestrial food webs can differ substantially in their intake of n-3 LC-PUFA, which may lead to differences in brain development, yet, this hypothesis remains to be tested. Here we use the previously demonstrated shift towards higher reliance on n-3 LC-PUFA deprived terrestrial prey of native brown trout Salmo trutta living in sympatry with invasive brook trout Salvelinus fontinalis to explore this hypothesis. We found that the content of n-3 LC-PUFA in muscle tissues of brown trout decreased with increasing consumption of n-3 LC-PUFA deprived terrestrial prey.Brain volume was positively related to content of the n-3 LC-PUFA, docosahexaenoic acid, in muscle tissues of brown trout. Our study thus suggests that increased reliance on low quality diet of n-3 LC-PUFA deprived subsidies can have a signi cant negative impact on brain development of wild trout. Our ndings are important, because ongoing global change is predicted to reduce the availability of dietary n-3 LC-PUFA across food webs and we showed here a rst evidence of how brain of wild vertebrate consumers response to scarcity of n-3 LC-PUFA content in natural prey.

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Section: Discussionmentioning

confidence: 75%

Linking omega-3 polyunsaturated fatty acids in natural diet with brain size of wild consumers

et al. 2022

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“…The EPA + DHA content was lower in the benthivorous perch in the eutrophic than in the mesotrophic lake. Nevertheless, DHA content alone did not differ between lakes, which is why it is possible that during the low availability of DHA in their diet, they biosynthesized DHA from ALA as was recently suggested based on the compound-specific isotope data (Scharnweber et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Ahlgren et al (1996) found that EPA and DHA content of roach is higher in oligotrophic lakes than in eutrophic lakes, whereas they did not find a similar difference in the perch, which is in contrast to our previous finding with piscivorous perch (Taipale, Vuorio, et al, 2016). Chaguaceda et al (2020) recently reported that the content of ARA, EPA, and DHA are strongly regulated over ontogeny in perch muscles based on their FA profiles and compound‐specific stable isotopes (Scharnweber et al, 2021). However, it is not clear how the low availability of DHA, caused by cyanobacteria blooming driven by eutrophication or climate change, impact EPA and DHA content of fish at different trophic levels.…”

Section: Introductionmentioning

confidence: 99%

Poor nutritional quality of primary producers and zooplankton driven by eutrophication is mitigated at upper trophic levels

Taipale

Ventelä

Litmanen

et al. 2022

Ecology and Evolution

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Eutrophication and rising water temperature in freshwaters may increase the total production of a lake while simultaneously reducing the nutritional quality of food web components. We evaluated how cyanobacteria blooms, driven by agricultural eutrophication (in eutrophic Lake Köyliöjärvi) or global warming (in mesotrophic Lake Pyhäjärvi), influence the biomass and structure of phytoplankton, zooplankton, and fish communities. In terms of the nutritional value of food web components, we evaluated changes in the ω‐3 and ω‐6 polyunsaturated fatty acids (PUFA) of phytoplankton and consumers at different trophic levels. Meanwhile, the lakes did not differ in their biomasses of phytoplankton, zooplankton, and fish communities, lake trophic status greatly influenced the community structures. The eutrophic lake, with agricultural eutrophication, had cyanobacteria bloom throughout the summer months whereas cyanobacteria were abundant only occasionally in the mesotrophic lake, mainly in early summer. Phytoplankton community differences at genus level resulted in higher arachidonic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) content of seston in the mesotrophic than in the eutrophic lake. This was also reflected in the EPA and DHA content of herbivorous zooplankton (Daphnia and Bosmina) despite more efficient trophic retention of these biomolecules in a eutrophic lake than in the mesotrophic lake zooplankton. Planktivorous juvenile fish (perch and roach) in a eutrophic lake overcame the lower availability of DHA in their prey by more efficient trophic retention and biosynthesis from the precursors. However, the most efficient trophic retention of DHA was found with benthivorous perch which prey contained only a low amount of DHA. Long‐term cyanobacterial blooming decreased the nutritional quality of piscivorous perch; however, the difference was much less than previously anticipated. Our result shows that long‐term cyanobacteria blooming impacts the structure of plankton and fish communities and lowers the nutritional quality of seston and zooplankton, which, however, is mitigated at upper trophic levels.

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Section: Discussionmentioning

confidence: 99%

Linking brain size in wild stream-dwelling brown trout with dietary supply of omega-3 fatty acids

Závorka¹,

Wallerius²,

Kainz³

et al. 2021

Preprint

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1. Omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) are key structural lipids and their dietary intake is essential for brain development of virtually all vertebrates. The importance of n-3 LC-PUFA has been demonstrated in clinical and laboratory studies, but little is known about how differences in availability of n-3 LC-PUFA in natural prey influence brain development of wild consumers. The availability of n-3 LC-PUFA in the prey communities is driven by primary producers and it is therefore distributed heterogeneously, but predictably across ecosystems, being higher in aquatic than in terrestrial food webs. Consequently, the numerous consumers foraging on the interface of aquatic and terrestrial food webs can differ substantially in their intake of n-3 LC-PUFA, which may lead to in brain development, yet, this hypothesis still remains to be tested. 2. Here we use the previously demonstrated shift towards higher reliance on n-3 LC-PUFA deprived terrestrial prey of native brown troutSalmo trutta living in sympatry with invasive brook troutSalvelinus fontinalis to explore this hypothesis. 3. We found that the content of n-3 LC-PUFA in muscle tissues of brown trout decreased with increasing consumption of n-3 LC-PUFA deprived terrestrial prey. Brain volume was positively related to content of the n-3 LC-PUFA, docosahexaenoic acid, in muscle tissues of brown trout. 4. Our study thus suggests that increased reliance on low quality diet of n-3 LC-PUFA deprived subsidies from terrestrial food web can have a significant negative impact on brain development of wild trout. These findings provide the first evidence of an intra-specific link between n-3 LC-PUFA content in natural prey and brain size of wild vertebrate consumers. 5. Ongoing global change is predicted to reduce the availability of dietary n-3 LC-PUFA across food webs. Therefore, our findings emphasise the need for further research on how wild consumers adapt to the shortage of dietary n-3 LC-PUFA in order to maintain optimal development and functioning of their brain, which is crucial for their fitness.

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Fatty acid accumulation in feeding types of a natural freshwater fish population

Cited by 25 publications

References 65 publications

Linking omega-3 polyunsaturated fatty acids in natural diet with brain size of wild consumers

Linking omega-3 polyunsaturated fatty acids in natural diet with brain size of wild consumers

Poor nutritional quality of primary producers and zooplankton driven by eutrophication is mitigated at upper trophic levels

Linking brain size in wild stream-dwelling brown trout with dietary supply of omega-3 fatty acids

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