Longitudinal variation in the nutritional quality of basal food sources and its effect on invertebrates and fish in subalpine rivers

Abstract

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Dietary fatty acid profiles shape crayfish biosynthesis and performance: Implications for riverine food webs

“…Analysis of FAs may improve our ability to predict how food‐web transformation affects consumer performance (Guo et al., 2021). Growth and survival of animals can be limited by the availability of some FAs which can serve as sources of cellular energy (Jardine et al., 2020; Twining et al., 2016) and the proportions of FAs vary among basal resources and different habitats (McInerney et al., 2020).…”

“…Analysis of FAs may improve our ability to predict how food-web transformation affects consumer performance (Guo et al, 2021).…”

Assessment of Compound-Specific Fatty Acid δ13C and δ2H Values to Track Fish Mobility in a Small Sub-alpine Catchment

“… 27 , 28 Temperature and p CO 2 are suspected to be the main driver of increasing δ 13 C-DIC values by altitude, however, soil respiration rate, instream metabolism, and anaerobic respiration cumulatively contribute to significant spatial variations in δ 13 C-DIC as well 29 and subsequently influence bulk and compound-specific δ 13 C values of primary producers and consumers. 30 …”

Differences in brain morphology of brown trout across stream, lake, and hatchery environments

“…Brain development is inherently linked to dietary supply of energy and nutrients, particularly of omega‐3 long‐chain polyunsaturated fatty acids (n‐3 LC‐PUFA) (Pilecky et al, 2021 ). The availability of these nutrients differs across ecosystems, and they are more available to fish in lake habitats than in streams, because stream habitats receive a relatively higher input of terrestrial organic matter that is poor in n‐3 LC‐PUFA (Guo et al, 2021 ; Heissenberger et al, 2010 ; Hixson et al, 2015 ). High amounts of dietary n‐3 LC‐PUFA are also typical for the diet of hatchery‐reared fish (Heissenberger et al, 2010 ; Tocher, 2015 ), which are also raised in habitats with extremely low physical complexity (Kihslinger et al, 2006 ; Näslund et al, 2012 ).…”

“…Brain development is inherently linked to dietary supply of energy and nutrients, particularly of omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) (Pilecky et al, 2021). The availability of these nutrients differs across ecosystems, and they are more available to fish in lake habitats than in streams, because stream habitats receive a relatively higher input of terrestrial organic matter that is poor in n-3 LC-PUFA (Guo et al, 2021;Heissenberger et al, 2010;Hixson et al, 2015).…”