Fatty acid profiles are biomarkers of fish habitat use in a river-floodplain ecosystem

Rude, Neil P.; Trushenski, Jesse T.; Whitledge, Gregory W.

doi:10.1007/s10750-016-2679-9

Cited by 13 publications

(16 citation statements)

References 53 publications

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“…DHA is selectively and highly retained over other PUFA in fish, consistent with all reviewed datasets. It is still not clear if the high retention of DHA in fish is mainly driven by dietary DHA (Dayhuff, ; Rude et al., ; Young et al., ) or by endogenous PUFA conversion (Henrotte et al., ; Hixson et al., ; Murray et al., ; Oboh, Betancor, Tocher, & Monroig, ; Tocher & Dick, ). Our results showed that DHA retention in fishes from subtropical rivers is greater than that from temperate rivers, suggesting fishes may spend extra energy to synthesise LC‐PUFA under high temperature leading to more energy loss (Farkas, Csengeri, Majoros, & Oláh, ).…”

Section: Discussionmentioning

confidence: 99%

“…Algal PUFA variations induced by river longitudinal gradients significantly affected fish PUFA composition (Dayhuff, ; Rude et al., ; Young et al., ). Interacted with light availability, nutrient inputs and temperature, river longitudinal gradients also determine fish distribution (Buisson, Blanc, & Grenouillet, ).…”

Section: Discussionmentioning

confidence: 99%

“…PUFA retention ratios between consumers (fish and invertebrates) and algae were calculated by dividing consumer PUFA% by algal PUFA% (i. (Dayhuff, 2004;Rude et al, 2016;Young et al, 2016) or by endogenous PUFA conversion (Henrotte et al, 2011;Hixson et al, 2014;Murray et al, 2014;Oboh, Betancor, Tocher, & Monroig, 2016;Tocher & Dick, 1999). Our results showed that DHA retention in fishes from subtropical rivers is greater than that from temperate rivers, suggesting fishes may spend extra energy to synthesise LC-PUFA under high temperature leading to more energy loss (Farkas, Csengeri, Majoros, & Ol ah, 1980).…”

Section: Polyunsaturated Fatty Acid Distribution and Retention In Imentioning

confidence: 99%

“…In addition, LC-PUFA retention in some consumers is strongly affected by environmental changes. For example, LC-PUFA retention in stream invertebrates was less in river sections with greater water temperature (Gladyshev et al, 2016), and varied in channel catfish, carp and bluegill with longitudinal locations from upstream to downstream of rivers (Dayhuff, 2004;Rude, Trushenski, & Whitledge, 2016;Young, Whitledge, & Trushenski, 2016). It is important to determine which physiological factors cause the differences in LC-PUFA retention among fish and invertebrates to improve our understanding of trophic PUFA dynamics and production in stream ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Polyunsaturated fatty acids in stream food webs – high dissimilarity among producers and consumers

et al. 2017

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Algae from temperate rivers had more EPA compared with algae from subtropical rivers. Stream invertebrates from both temperate and subtropical rivers preferentially retain algal EPA and their PUFA tend to vary with algal PUFA. Invertebrates may be capable of regulating their fatty acid (FA) composition, but this ability is limited, to the extent that they must obtain physiologically important LC-PUFA primarily from algae.3. DHA is selectively and highly retained in all fish taxa irrespective of their feeding sites (i.e. temperate or subtropical rivers). However, DHA content is variable among stream fish taxa and is likely linked to resource utilisation and their endogenous metabolism. Freshwater salmonids have a very high DHA content, which suggests they preferentially retain this FA or biosynthesise it from EPA. The PUFA profiles of other fish taxa more closely reflect their dietary PUFA supply. However, so far very few studies have considered the differences in the PUFA biosynthesis of fish taxa in rivers or compared the dietary PUFA effect on different fish taxa.4. The supply of LC-PUFA from streams and rivers is known to be affected by altered light availability, greater nutrient inputs and other anthropogenic activities, and any decrease in algal LC-PUFA production will negatively affect the consumers that are nutritionally dependent on these molecules. Further investigations are needed to understand how environmental changes affect LC-PUFA production and retention in stream ecosystems, and how to protect streams from threats to this essential ecosystem service. K E Y W O R D Salgae, biomarker, freshwater fish, invertebrates, trophic transfer

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Polyunsaturated Fatty Acid Distribution and Retention In Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyunsaturated fatty acids in stream food webs – high dissimilarity among producers and consumers

et al. 2017

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“…Spatial variation in lower food web processes can also exert strong influences on spatial heterogeneity in food web structure in aquatic systems (Crowder & Cooper, 1982;Rude, Trushenski, & Whitledge, 2016;Sass, Gille, Hinke, & Kitchell, 2006). The southwest portion of the lake receives relatively little allochthonous nutrient input from different land use types (forested vs. urban and agriculture) compared to other sites, which may affect fatty acid availability by changing primary production pathways from bacterial and detrital sources to phytoplankton production (Larson et al, 2013;Lau et al, 2012;Rude et al, 2016;Scharold, Corry, Yurista, & Kelly, 2015). Similar west-to-east spatial patterns have been observed in the microbial communities, nitrogen cycling dynamics and nearshore primary productivity in Lake Michigan (Gardner et al, 2004;Hutton Stadig, 2016;Turschak et al, 2018).…”

Section: Spatial Variation In Trophic Diversity and Niche Sizementioning

confidence: 99%

Individual and spatial variation are as important as species‐level variation to the trophic complexity of a lentic food web

Feiner

Foley

Bootsma

et al. 2019

Ecology of Freshwater Fish

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Ecological complexity may improve ecosystem function, stability and adaptability to natural and anthropogenic disturbances. Intraspecific trophic variation can represent a significant component of total community variation and can influence food web structure and function. Thus, understanding how trophic niches are partitioned between intraspecific and interspecific processes could improve our understanding of food web dynamics. We examined gut contents, fatty acids and stable isotope ratios in round goby (Neogobius melanostomus) and yellow perch (Perca flavescens) across six sites in Lake Michigan, USA, to determine patterns in intra‐ and interspecific trophic composition (i.e., mean gut or fatty acid composition) and diversity (i.e., the diversity of gut items or fatty acids). We also examined relationships between fatty acid diversity and gut content characteristics to understand potential mechanisms shaping individual trophic phenotypes. There was significant variation in both trophic composition and diversity among sites, and individual and spatial variation was as important to total trophic variation as species identity. Round goby that consumed dreissenid mussels had more diverse fatty acid profiles than those that consumed other benthic invertebrates, whereas yellow perch fatty acid diversity was not related to gut content composition. Our results confirm that intraspecific variation in resource use can be as important to trophic dynamics as interspecific variation, and that spatial variation in lower level food web processes or habitat may strongly structure local food web dynamics. Individual‐level examination of trophic diversity, in concert with trophic composition, could provide additional information about the resilience, function and adaptability of local food webs.

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Spatial and temporal variance in fatty acid and stable isotope signatures across trophic levels in large river systems

Fritts

Knights

Lafrancois

et al. 2018

River Research & Apps

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Fatty acid and stable isotope signatures allow researchers, managers, and policy makers to better understand food webs, food sources, and trophic relationships.Research in marine and lentic systems has indicated that the variance of these biomarkers can exhibit substantial differences across spatial and temporal scales, but this type of analysis has not been completed for large river systems. Our objectives were (a) to evaluate variance structures for fatty acids and stable isotopes (i.e., δ 13 C and δ 15 N) of seston, threeridge mussels, hydropsychid caddisflies, gizzard shad, and bluegills across spatial scales (10s-100s of km) in large rivers of the Upper Mississippi River Basin, USA, that were sampled annually for 2 years and (b) to evaluate the implications of this variance on the design and interpretation of trophic studies. The greatest variance for both stable isotopes was present at the largest spatial scale for all taxa (except seston δ 15 N), indicating that these isotopic signatures are responding to factors at a larger geographic level rather than being influenced by local-scale alterations. Conversely, the greatest variance for fatty acids was present at the smallest spatial scale (i.e., among individuals) for all taxa except caddisflies, indicating that the physiological and metabolic processes that influence fatty acid profiles can differ substantially between individuals at a given site. Our results highlight the need to consider the spatial partitioning of variance during sample design and analysis, as some taxa may not be suitable for use in assessing ecological questions at larger spatial scales. KEYWORDS carbon stable isotope, fatty acid, food webs, lotic, multivariate variance, nitrogen stable isotope

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Fatty acid profiles are biomarkers of fish habitat use in a river-floodplain ecosystem

Cited by 13 publications

References 53 publications

Polyunsaturated fatty acids in stream food webs – high dissimilarity among producers and consumers

Polyunsaturated fatty acids in stream food webs – high dissimilarity among producers and consumers

Individual and spatial variation are as important as species‐level variation to the trophic complexity of a lentic food web

Spatial and temporal variance in fatty acid and stable isotope signatures across trophic levels in large river systems

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