Isotopic half‐life and enrichment factor in two species of European freshwater fish larvae: an experimental approach

Latli, Adrien; Sturaro, Nicolas; Desjardin, Nelson; Michel, Loïc; Otjacques, William; Lepoint, Gilles; Kestemont, Patrick

doi:10.1002/rcm.7838

Cited by 4 publications

(3 citation statements)

References 47 publications

(118 reference statements)

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“…Our results confirmed that isotopic carbon and nitrogen half‐lives of first‐feeding rainbow trout were clearly influenced by the quality of the protein (animal versus plant). The half‐lives we estimated ranged from 7–16 days, which were similar to those for other fish species of similar age (Latli et al., 2017; Weidel et al., 2011). Carbon and nitrogen isotopic incorporation rates were lower for fry fed CGM than for fry fed MixM.…”

Section: Discussionsupporting

confidence: 85%

How protein quality drives incorporation rates and trophic discrimination of carbon and nitrogen stable isotope ratios in a freshwater first‐feeding fish

et al. 2020

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1. Using stable isotope ratios to explore the trophic ecology of freshwater animals requires knowledge about effects of food quality on isotopic incorporation dynamics. The aim of this experimental study was to: (1) estimate carbon and nitrogen isotopic incorporation rates and trophic discrimination factors (TDFs) of a freshwater first-feeding fish (i.e. salmonid fry) fed three diets that differed only in protein quality (animal or plant or a blend of both); (2) investigate effects of fasting and; (3) evaluate the proportion of each source assimilated when fry were fed a 50:50 animal:plant-based diet. 2. For each diet, incorporation rates of δ 13 C and δ 15 N values were estimated using a time or growth-dependent isotopic incorporation model. Effects of fasting on isotope ratio values were measured regularly until the death of fry. Bayesian stableisotope mixing models were used to estimate the contribution of animal and plant material to fish fed a blend of both food types. 3. Our results show that incorporation rates were lower for fry fed a plant-based diet than for those fed an animal-based diet as growth rate decreased. Timeand growth-dependent models indicated that growth was solely responsible for isotopic incorporation in fry fed an animal-based diet, whereas catabolism increased in fry fed a plant-based diet. After lipid extraction, carbon TDFs were similar regardless of the diet, whereas nitrogen TDFs increased for fry fed a plantbased diet. Long-term fasting induced an increase of 0.63‰ in δ 13 C values of fry in 23 days, whereas δ 15 N values did not vary significantly. Proportions of food sources assimilated by fry fed an animal:plant-based diet were similar to those consumed when using a mixing model with the estimated TDFs, while proportions were unrealistic when using mean TDFs extrapolated from the literature. 4. The results of our study indicate that the quality of food must be considered to use an appropriate timescale to detect changes in fry diets in the field. Moreover, we recommend using different carbon and nitrogen TDFs, one for animal-derived | 1871 NAHON et Al.

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Section: Discussionsupporting

confidence: 85%

How protein quality drives incorporation rates and trophic discrimination of carbon and nitrogen stable isotope ratios in a freshwater first‐feeding fish

et al. 2020

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“…The isotopic variations of potential food sources were characterised by the mean of the taxa family (± SD ) and the abundance of each taxon analysed (Supporting Information Appendix S1). The MixSIAR models were constructed using trophic enrichment factors determined previously by the authors during a controlled experiment targeted on YOY of the studied species (Latli, Sturaro, et al., ) and with the formula proposed by Caut, Angulo, and Courchamp () for adults. To reduce the number of potential food sources in the model, we pooled prey types if stable isotope values were not statistically different as proposed by Phillips et al.…”

Section: Methodsmentioning

confidence: 99%

River habitat homogenisation enhances trophic competition and promotes individual specialisation among young of the year fish

et al. 2019

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In large rivers, fish ontogenic development success is mainly influenced by resource availability and by the possibility of species to adapt their diet (i.e. trophic niche). Humans have drastically modified freshwater habitats, notably for navigation purposes. Such modifications may reduce food availability for young of the year (YOY) fish and, consequently, influence their ability to reach the adult age. In the Meuse River, decrease of fish abundance is thought to be linked to a drastic reduction of phytoplankton biomass. In this context of decreasing phytoplankton biomass, we studied trophic niches of three cyprinid species (common bleak Alburnus alburnus, chub Squalius cephalus, and roach Rutilus rutilus) and one percid species (European perch Perca fluviatilis) at various stages of development, using stable isotope analysis in order to compare intra‐ and interspecific competition between sites differing in degree of channelisation. Two reaches of the Meuse River differing by their degree of regulation were investigated. We hypothesised that habitat homogenisation would (1) decrease food resource availability and diversity and (2) increase trophic competition, particularly among earlier ontogenic stages, and promote individual specialisation. Our study provides evidence that in the context of low planktonic biomass, most YOY relied on benthic food sources. Furthermore, the Meuse River flow and depth regulation significantly impacted the abundance and species richness of YOY. In the heavily channelised reach, between‐stages competition and low resource diversity lead to an increase in diet partitioning between cyprinid larvae, as well as consumption of non‐optimal energetic food sources such as aquatic vegetation by some individuals. By contrast, in the less channelised reach, larvae displayed a generalist feeding habit focusing on high energy content prey such as different taxa of macroinvertebrates, suggesting that the diversity of habitat reduces the food competition within and between stages. Intraspecific resource repartition is a key point for YOY fish having to cope with plankton‐depleted conditions. Younger cyprinid stages seem more affected by intra‐ and inter‐specific competition in the more channelised reach. YOY fish communities were also less diversified and abundant in the more altered site, which highlight the importance of limiting channelisation to better conserve fish communities.

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“…We calculated the contributions of potential food sources for each species for each date of sampling with the R-software (R 3.6.2 version, R Development Core Team, 2016) using the package MixSIAR (Stock et al, 2018). The MixSIAR models were constructed using trophic enrichment factor (TEF) determined previously by Latli et al (2017) that concerned chub fish larvae (TEF = 2.1‰ ± 0.03 for δ 13 C and 2.3‰ ± 0.8 for δ 15 N). Standard error of the δ 13 C was finally increased until 0.5 ‰ giving a better accuracy of the models.…”

Section: Food Resources Fish Sampling and Isotope Measurementsmentioning

confidence: 99%

Flow and plankton availability control young‐of‐the‐year fish diet in two floodplain nurseries

Marle

Simon

Rigal

et al. 2023

Ecology of Freshwater Fish

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In large river floodplains, the availability of trophic resources to the fish fauna is highly variable as a consequence of seasonal environmental change and habitat diversity. Young‐of‐the‐year fishes (YOY) must find suitable habitats to settle, feed and survive. However, very few in‐depth studies are available about the food preferences of the young fishes during their first growing season. Here, we investigated the composition of planktonic assemblages and the YOY diet of three generalist fish species Alburnus alburnus (Linnaeus, 1758), Squalius cephalus (Linnaeus, 1758) and Pseudorasbora parva (Temminck & Schlegel, 1846) from four floodplain sites of the French Upper Rhône River. More specifically, we studied their temporal and spatial variations in relation to five environmental variables: hydrology, dissolved oxygen, primary production, water temperature and conductivity. Stable flow conditions and the associated temperature and conductivity strongly structured the phytoplankton community in the floodplain channels, whereas water movements within channels and dissolved oxygen concentrations were significantly correlated to the zooplankton composition. A zooplankton density above ≈100 ind L−1 allowed the initiation of a YOY diet mainly based upon zooplankton for the three fish species. When zooplankton densities were insufficient, all three species used phytoplankton as their main food resource. Finally, the diet overlaps between species, differed significantly between sites. The study highlights the need to examine the diet of juvenile fishes and environmental variables in the floodplains.

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Isotopic half‐life and enrichment factor in two species of European freshwater fish larvae: an experimental approach

Cited by 4 publications

References 47 publications

How protein quality drives incorporation rates and trophic discrimination of carbon and nitrogen stable isotope ratios in a freshwater first‐feeding fish

How protein quality drives incorporation rates and trophic discrimination of carbon and nitrogen stable isotope ratios in a freshwater first‐feeding fish

River habitat homogenisation enhances trophic competition and promotes individual specialisation among young of the year fish

Flow and plankton availability control young‐of‐the‐year fish diet in two floodplain nurseries

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