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

McInerney, Paul; Stoffels, Rick J.; Shackleton, Michael; Davey, Chris D.; Albert, Jenessa; Rees, Gavin N.

doi:10.1111/fwb.13895

Cited by 5 publications

(4 citation statements)

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“…These values are higher than those reported for concentrations among lipids in detritus (4.9% and 1.2%, respectively; McInerney et al, 2022) and suggest that despite a lack of some LC PUFA, our study biofilms may still represent a nutritional food resource for animals. For example, McInerney et al (2022) identified that POA and OA were among four fatty acids selectively retained by crayfish, implying that proportions of these fatty acids may be particularly important for their somatic growth.…”

Section: Discussioncontrasting

confidence: 83%

“…The consistency of fungal presence was reflected in fatty acid profiles, with monounsaturated fatty acid fungal biomarkers 18:1ω9 (OA) and 16:1ω7 (POA) contributing 8%–10% and 1.5%–3.5%, respectively, to total lipids for the duration of the study. These values are higher than those reported for concentrations among lipids in detritus (4.9% and 1.2%, respectively; McInerney et al, 2022) and suggest that despite a lack of some LC PUFA, our study biofilms may still represent a nutritional food resource for animals. For example, McInerney et al (2022) identified that POA and OA were among four fatty acids selectively retained by crayfish, implying that proportions of these fatty acids may be particularly important for their somatic growth.…”

Section: Discussioncontrasting

confidence: 83%

“…Biofilm‐inhabiting meiofauna can be comprised of a varied assemblage of rotifers, nematodes, gastrotrichs, tardigrades, turbellarians, microcrustacea, oligochaetes, and insect larvae which can occur in densities >100 individuals cm −2 (Majdi et al, 2012; Norf et al, 2009). Benthic invertebrates can preferentially retain LC PUFA from high‐quality algal sources (Kühmayer et al, 2020) and consumption of high‐quality foods by invertebrates can have a twofold effect on biofilm fatty acid composition: (1) consumption and removal of high‐quality fatty acids from biofilms can decrease the concentration of these fatty acids among total biofilms and (2) preferential retention of those molecules by animals (e.g., McInerney et al, 2022) and subsequent excretion of poor‐quality waste material in replacement will further dilute fatty acid quality within the biofilm matrix. The remaining biofilm matrix is left comparatively more abundant in less palatable or poor‐quality organic fractions.…”

Section: Discussionmentioning

confidence: 99%

“…Diatoms are particularly rich in LC PUFA, and biofilms comprising high proportions of these organisms are thought to provide the optimal basal food resource for riverine consumers (Brett et al, 2017). Additionally, some monounsaturated fatty acids that are typically associated with fungi (e.g., oleic acid [OA, 18:1ω9] and palmitoleic acid [POA, 16:1ω7]) are also associated with increased consumer growth and performance of some freshwater consumers (McInerney et al, 2022) and specific physiological fatty acid requirements for individual species is an active area of research.…”

Section: Introductionmentioning

confidence: 99%

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Can you see the algae for the slime? Temporal patterns of biofilm food quality and quantity in lowland rivers

McInerney,

Shackleton,

McPhan

et al. 2023

Ecosphere

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Animals must invest some portion of their metabolism to activities related to physiological maintenance and the remainder to processes related to the production of new biomass for growth and reproduction. Animal metabolism is fuelled by food, and the quality and quantity of food, along with the effort invested to obtain it, are fundamental to supporting populations. Biofilms are a primary basal food resource within riverine food webs, and it is thought that their nutritional value for animals decreases with age due to dynamic changes in community composition. We sought to test assumptions of spatiotemporal changes to biofilm nutritional value by assessing variations in biofilm mass and fatty acid composition in three rivers for 73 days. We also used a multi‐prong eDNA approach to characterize changes to biofilm fungal (ITS1–4), bacterial (16S), and algal (23S) community compositions. We anticipated biofilm food value to decrease with biofilm age due to shifts in composition from high‐quality green algae and diatoms to low‐quality cyanobacteria and filamentous algae. Our results partially support this contention; biofilm food value, assessed as a combination of fatty acid mass per unit area (in grams per square meter) and concentration of fatty acids (in milligrams per gram), was dynamic and peaked between 24 and 43 days following submersion. After 43 days, biofilm food value decreased. However, despite significant temporal changes in biofilm community composition and a decrease in overall lipid concentration, the proportions of different fatty acid classes among total lipids did not vary. Instead, the observed increase in the abundance of cyanobacteria and filamentous algae compared with diatoms and green algae, along with higher quantities of lipid‐poor extracellular polymeric substances (EPS), likely contributed to the reduction in overall lipid concentration relative to the biofilm dry mass. Here we present a novel approach to balance consumer energetic costs with food quality within aquatic food webs. Our results have important implications for river management and provide valuable information for the use of environmental water to support lotic ecosystems.

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Section: Discussioncontrasting

confidence: 83%

Section: Discussioncontrasting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Can you see the algae for the slime? Temporal patterns of biofilm food quality and quantity in lowland rivers

McInerney,

Shackleton,

McPhan

et al. 2023

Ecosphere

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Quantification of multiple environmental controls on lipid biomarkers in common marine diatoms and dinoflagellates

Cao,

Bi,

Zhang

et al. 2023

Mar Biol

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Ocean-related global changes have altered phytoplankton community structure, especially the diatomdino agellate competition, which further in uences ecosystem structure and functions. The pivotal ecological roles of diatoms and dino agellates are strongly related with their biochemical compositions, while quantitative comparisons of biochemical changes between diatoms and dino agellates under variable environments are still limited. We investigated responses of lipid biomarkers (sterols and fatty acids (FAs)) to different temperatures (12, 18 and 24℃), nitrogen and phosphorus concentrations and their molar ratios (N:P ratio) of 10:1, 24:1 and 63:1 in marine diatom Phaeodactylum tricornutum and dino agellate Prorocentrum minimum. Over these wide ranges of temperature and nutrient conditions, sterol and FA pro les were relatively stable in the two species. For C-normalized contents of major sterols and FAs, warming caused non-signi cant changes in the diatom but an increase (up to 153%) in the dino agellate; eutrophication caused an overall decrease (up to 53%) in the diatom but an overall increase (up to 77%) in the dino agellate; in contrast, imbalanced N:P ratios caused an overall increase (up to 64%) in the diatom but an overall decrease (up to 53%) in the dino agellate. Under future ocean warming, eutrophication and imbalanced N:P ratios, major sterol and polyunsaturated FA contents would increase (ca. 9% ~ 48%) in the dino agellate, while those in the diatom would change non-signi cantly. This study expands our knowledge on lipid-based indicators of phytoplankton under changing environments, which by systematically linking with several other aspects of food quality will help to understand the ecological role of diatom-dino agellate community changes.

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Elements and omega-3 fatty acids in fishes along a large, dammed river

Velichka,

Kidd,

Munkittrick

et al. 2023

Environmental Pollution

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

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 5 publications

References 92 publications

Can you see the algae for the slime? Temporal patterns of biofilm food quality and quantity in lowland rivers

Can you see the algae for the slime? Temporal patterns of biofilm food quality and quantity in lowland rivers

Quantification of multiple environmental controls on lipid biomarkers in common marine diatoms and dinoflagellates

Elements and omega-3 fatty acids in fishes along a large, dammed river

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