Allochthony, fatty acid and mercury trends in muscle of Eurasian perch (Perca fluviatilis) along boreal environmental gradients

Keva, Ossi; Kiljunen, Mikko; Hämäläinen, Heikki; Jones, Roger; Kahilainen, Kimmo K.; Kankaala, Paula; Laine, Miikka B.; Schilder, Jos; Strandberg, Ursula; Vesterinen, Jussi; Taipale, Sami J.

doi:10.1016/j.scitotenv.2022.155982

Cited by 3 publications

(3 citation statements)

References 97 publications

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“…The terrestrial index for individual fish was modeled, using a modified two‐end members mixing model similar to the allochthony index from Keva et al. ( 2022 ).

is the measured value of the individual fish consumer.…”

Section: Methodsmentioning

confidence: 99%

“…The terrestrial index for individual fish was modeled, using a modified two‐end members mixing model similar to the allochthony index from Keva et al. (2022).

\mathrm{Terrestrial}\ \mathrm{index}=\frac{\left({\updelta}^2{\mathrm{H}}_{\mathrm{C}\kern0.5em }-{\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{aquatic}}\right)}{\left({\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{terrestrial}}-{\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{aquatic}}\right)}

{\updelta}^2{\mathrm{H}}_{\mathrm{C}}

is the measured value of the individual fish consumer.…”

Section: Methodsmentioning

confidence: 99%

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Effects of mining activities on fish communities and food web dynamics in a lowland river

Scharnweber,

Scholz,

Schippenbeil

et al. 2024

Ecology and Evolution

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Fish communities of streams and rivers might be substantially subsidized by terrestrial insects that fall into the water. Although such animal‐mediated fluxes are increasingly recognized, little is known about how anthropogenic perturbations may influence the strength of such exchanges. Intense land use, such as lignite mining, may impact a river ecosystem due to the flocculation of iron (III) oxides, thus altering food web dynamics. We compared sections of the Spree River in North‐East Germany that were greatly influenced by iron oxides with sections located downstream of a dam where passive remediation technologies are applied. Compared to locations downstream of the dam, the abundance of benthic macroinvertebrates at locations of high iron concentrations upstream of the dam was significantly reduced. Similarly, catch per unit effort of all fish was significantly higher in locations downstream of the dam compared to locations upstream of the dam, and the condition of juvenile and adult piscivorous pike Esox lucius was significantly lower in sections of high iron concentrations. Using an estimate of short‐term (i.e., metabarcoding of the gut content) as well as longer‐term (i.e., hydrogen stable isotopes) resource use, we could demonstrate that the three most abundant fish species, perch Perca fluviatilis, roach Rutilus rutilus, and bleak Alburnus alburnus, received higher contributions of terrestrial insects to their diet at locations of high iron concentration. In summary, lotic food webs upstream and downstream of the dam greatly differed in the overall structure with respect to the energy available for the highest tropic levels and the contribution of terrestrial insects to the diet of omnivorous fish. Therefore, human‐induced environmental perturbations, such as river damming and mining activities, represent strong pressures that can alter the flow of energy between aquatic and terrestrial systems, indicating a broad impact on the landscape level.

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“…The terrestrial index for individual fish was modeled, using a modified two‐end members mixing model similar to the allochthony index from Keva et al. ( 2022 ).

is the measured value of the individual fish consumer.…”

Section: Methodsmentioning

confidence: 99%

“…The terrestrial index for individual fish was modeled, using a modified two‐end members mixing model similar to the allochthony index from Keva et al. (2022).

\mathrm{Terrestrial}\ \mathrm{index}=\frac{\left({\updelta}^2{\mathrm{H}}_{\mathrm{C}\kern0.5em }-{\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{aquatic}}\right)}{\left({\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{terrestrial}}-{\updelta}^2{\mathrm{H}}_{\mathrm{C}\ 100\%\mathrm{aquatic}}\right)}

{\updelta}^2{\mathrm{H}}_{\mathrm{C}}

is the measured value of the individual fish consumer.…”

Section: Methodsmentioning

confidence: 99%

Effects of mining activities on fish communities and food web dynamics in a lowland river

Scharnweber,

Scholz,

Schippenbeil

et al. 2024

Ecology and Evolution

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“…Tese values are comparable to those reported by Aissioui et al [30] in sardine muscle from the Algiers Sea, lower than those found by Chahid et al [29] and higher than those registered by Traina et al [27] in sardine from the Mediterranean Sea of Italy. Concerning the Hg, we have compared our result to the PTWI defned for methylmercury (MeHg: 1.6 μg/kg/ body weight) which is classifed as possibly carcinogenic to humans [57,58]. Several studies have reported that fsh meat contains especially MeHg form (toxic form).…”

Section: Health Risk Assessmentmentioning

confidence: 99%

Heavy Metals Concentration in Sardina pilchardus (Walbaum, 1792) from the Moroccan Mediterranean Coast and Potential Human Health Risk Assessment

Kasmi

Belhaj²,

Nasri

et al. 2023

Journal of Food Quality

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Due to their toxicity, long persistence, bioaccumulative nature, and biomagnification in the food chain, heavy metals pose a serious hazard. The aim of this study was to evaluate the health risks associated with the consumption of Sardina pilchardus (Walbaum, 1792) and to study the spatiotemporal dynamics of four potentially toxic metallic elements. Three hundred and sixty specimens of sardine were collected between December 2020 and October 2021 at three Mediterranean coast sites, Beni-Ensar, Ras el Ma, and El-Houceima, in the northeast region of Morocco. The toxic metallic elements were evaluated by assessing the contamination level of cadmium (Cd), mercury (Hg), lead (Pb), and arsenic (As) in the muscle, liver, and gills of sardine from the Mediterranean Moroccan coast. The results showed a significant effect of the study area, organ, and season ( p > 0.05 ) on Moroccan Mediterranean sardine heavy metal contamination levels. Regardless the location and season, the liver presents the higher concentration of the studied metals ( p < 0.05 ). The highest heavy metal concentrations of Cd (0.408 μg·g−1 wet weight (ww)), Hg (0.044 μg·g−1 ww), and As (6.74 μg·g−1 ww) were found in winter while the concentration of Pb was the highest in autumn (0.056 μg·g−1 ww). Furthermore, the lowest contamination of metal levels was found in the spring. El-Houceima region contains the highest values for Hg (0.093 μg·g−1 ww), Pb (0.018 μg·g−1 ww), and As (7.73 μg·g−1 ww). However, the highest values for Cd (0.172 μg·g−1 ww) were recorded in Beni-Ensar. Regarding the assessment of possible risks to human health, the results showed that the indices are below the established safety values in the case of estimated weekly intake, and target hazard quotient (THQ). In contrast, the carcinogenic risk index and total THQ were above the threshold limits and thus represented a potential carcinogenic risk to human health.

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Influence of the dietary contribution of terrestrial insects to the condition factor of bleak Alburnus alburnus in a highly polluted lowland river

Scharnweber,

Milano,

Hühn

2024

Journal of Fish Biology

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Bleak Alburnus alburnus is a highly abundant but understudied fish species, and we know little about the trophic ecology of populations inhabiting rivers in central Europe. From an ecosystem perspective, this fish species is interesting as it is known to feed on surface insects, thereby linking the terrestrial with the aquatic habitat. In a previous study, we demonstrated that this flux is intensified, and dietary contribution of terrestrial insects is higher in fish inhabiting sections of the Spree River, Germany, that are polluted from iron oxides occurring from former lignite mining activities, and thus are characterized by lower abundances of aquatic insects. As terrestrial insects can be considered as food of lower quality (measured as long‐chained polyunsaturated fatty acids, n‐3 LC‐PUFAs) compared to aquatic prey, it is reasonable to assume that the higher contribution of terrestrial insects is related to a lower body condition in fish. In this study, we explore the trophic ecology of riverine A. alburnus and their fitness consequences of feeding on terrestrial insects. We therefore modeled a terrestrial index from stable isotopes of hydrogen (δ2H) measured in the A. alburnus muscle tissue and compared individuals caught in locations upstream of a dam that were greatly influenced by iron oxides, with individuals caught in sections located downstream of a dam where passive remediation technologies are applied. The terrestrial index was significantly higher in A. alburnus caught in locations at high‐iron concentrations, characterized by low abundances of aquatic prey, compared to A. alburnus caught in unpolluted habitats at low‐iron concentrations. In contradiction to our hypothesis, the terrestrial index had no significant effect on the body condition of A. alburnus (measured as Fulton's condition factor K) in the sections downstream of the dam (i.e., at low‐iron concentrations) and a significant positive, albeit weak, effect in sections upstream of the dam (i.e., at high‐iron concentrations). However, the condition factor was generally lower in the high‐iron section, potentially related to more direct effects of the iron oxide. We conclude that in A. alburnus, terrestrial insects can be considered as the less‐favored food, unless the fish occur in environments where the aquatic food is of limited availability. Further research is needed to evaluate the direct and indirect effects, including the internal n‐3 LC‐PUFA synthesis as an adaption toward low‐quality terrestrial prey on the fitness consequences of A. alburnus.

show abstract

Allochthony, fatty acid and mercury trends in muscle of Eurasian perch (Perca fluviatilis) along boreal environmental gradients

Cited by 3 publications

References 97 publications

Effects of mining activities on fish communities and food web dynamics in a lowland river

Effects of mining activities on fish communities and food web dynamics in a lowland river

Heavy Metals Concentration in Sardina pilchardus (Walbaum, 1792) from the Moroccan Mediterranean Coast and Potential Human Health Risk Assessment

Influence of the dietary contribution of terrestrial insects to the condition factor of bleak Alburnus alburnus in a highly polluted lowland river

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