Blood mercury concentrations in four sympatric gull species from South Western France: Insights from stable isotopes and biologging

Jouanneau, William; Sebastiano, Manrico; Rozen‐Rechels, David; Harris, Stephanie M.; Blévin, Pierre; Angelier, Frédéric; Brischoux, François; Gernigon, Julien; Lemesle, Jean‐Christophe; Robin, Frédéric; Cherel, Yves; Bustamante, Paco; Chastel, Olivier

doi:10.1016/j.envpol.2022.119619

Cited by 11 publications

(5 citation statements)

References 103 publications

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“…However, it also should be noted that previous work on the same seabird populations found that the isotopic niche of chicks (inferred from nitrogen and carbon stable isotopes), highly overlapped among the four studied species (Jouanneau et al 2022b). Therefore, except the observed small inter-individual variation in the way chicks are fed by their parents (Jouanneau et al 2022b), other factors like excretion and/or assimilation mechanisms, may also drive the observed concentrations.…”

Section: Discussionmentioning

confidence: 78%

“…As bird eggs commonly contain very low level of PFHxS compared with other PFAS (Groffen et al, 2017;Jouanneau et al, 2022a;Verreault et al, 2005), one possible explanation might be that the other species fed their young with a higher proportion of eggs than herring gulls have, resulting in lower levels of blood PFHxS. However, it also should be noted that previous work on the same seabird populations found that the isotopic niche of chicks (inferred from nitrogen and carbon stable isotopes), highly overlapped among the four studied species (Jouanneau et al 2022b). Therefore, except the observed small inter-individual variation in the way chicks are fed by their parents (Jouanneau et al 2022b), other factors like excretion and/or assimilation mechanisms, may also drive the observed concentrations.…”

Section: Discussionmentioning

confidence: 85%

“…One alternative explanation for this PFAS -telomere association may lie in the nutritional status of the birds. Although yellow-legged gull adults from the study area show a generalist diet (Jouanneau et al, 2022b), the chicks included in this study are fed with high trophic level food of marine origin as highlighted by the high carbon and sulphur stable isotope values (Jouanneau et al, 2022b). If the high L-PFOS concentrations have no negative effect on the chicks of this species (given the absence of negative association with other markers), the high-quality diet they receive may actually have a beneficial effect on their physiology, including telomere length.…”

Section: Discussionmentioning

confidence: 93%

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Physiological effects of PFAS exposure in seabird chicks: A multi-species study of thyroid hormone triiodothyronine, body condition and telomere length in South Western France

Sebastiano

Jouanneau

Blévin

et al. 2023

Science of The Total Environment

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 93%

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Physiological effects of PFAS exposure in seabird chicks: A multi-species study of thyroid hormone triiodothyronine, body condition and telomere length in South Western France

Sebastiano

Jouanneau

Blévin

et al. 2023

Science of The Total Environment

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“…Past studies have used sulfur isotopes to reconstruct Earth's biogeochemical history, study microbial activity, quantify nutrient inputs into estuaries, and identify the sources and bioaccumulation patterns of pollutants (Peterson and Howarth 1987, Fry et al 1988, Canfield 2001, Fry and Chumchal 2012, Lavoie et al 2015, Penland et al 2018, Elliott et al 2021, Jouanneau et al 2022). Sulfur containing amino acids (methionine, cystine, cysteine, and taurine) and sulfolipids are important dietary sources of organic sulfur to animals (Farooqui and Horrocks 1985, Brosnan and Brosnan 2006).…”

Section: Introductionmentioning

confidence: 99%

Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins

2023

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The use of stable isotopes of sulfur (δ 34S) to infer avian diets, foraging habitats, and movements is relatively uncommon, resulting in a lack of information on patterns of δ 34S incorporation in avian tissue. In a controlled study of Gentoo Penguins (Pygoscelis papua), we found that diet-tissue isotopic discrimination factors (Δ 34Sdiet-tissue) differed among egg components and feathers synthesized from a common diet, ranging from –0.4 to –1.7‰. We also found that methodical choices such as lipid extraction and prey tissue selection influenced calculated Δ 34Sdiet-tissue values. Specifically, Δ 34Sdiet-tissue values were lower (i.e., more negative) when calculated using whole fish relative to fish muscle and lipid-extraction biased egg yolk, but not fish tissue, δ 34S values. The Δ 34Sdiet-tissue values obtained for Gentoo Penguins fed a marine fish diet were generally lower than those reported for freshwater fish consumption by Double-crested Cormorants (Phalacrocorax auritus), the only other bird species in which Δ 34Sdiet-tissue has been quantified. We found support for the hypothesis that tissue Δ 34Sdiet-tissue values are inversely related to dietary δ 34S values in birds, similar to what has been observed in mammals. Given this relationship, the discrimination factors reported here for Gentoo Penguins may be broadly applicable to other avian species with a similar marine diet. Finally, we provide recommendations for future studies seeking to quantify Δ 34Sdiet-tissue in avian tissues and guidance to allow for greater application of sulfur stable isotope analysis in ornithological research.

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“…), in particular, are ideal study species for addressing this gap in knowledge as they are generalist foragers, feeding on both natural marine prey and urban refuse (Maynard & Ronconi, 2018; Méndez et al, 2020; Spelt et al, 2019; Washburn et al, 2013), and breed at both remote (less‐urban) colonies and colonies within peri‐urban coastal regions (e.g., Fuirst et al, 2018; Maynard & Ronconi, 2018; Mendes et al, 2018; Shaffer et al, 2017). Furthermore, gulls often nest sympatrically (e.g., Jouanneau et al, 2022; Lato et al, 2021), allowing interspecific interactions to be assessed at the same study site.…”

Section: Introductionmentioning

confidence: 99%

Peri‐urban systems alter trophic niche size and overlap in sympatric coastal bird species

et al. 2023

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Urban habitats can create empty trophic niche space by providing abundant alternative dietary resources, allowing some generalist species to either shift or expand their trophic niches. Resulting changes to trophic niche size may consequently affect interspecific interactions and competition, although trophic impacts are less clear in peri‐urban systems, where both natural and urban resources are readily accessible to highly mobile species. We combined stable isotope (δ13C, δ15N, δ34S) data with GPS tracking of two sympatric coastal bird species (Larus argentatus, L. marinus) across four study sites on the east coast of the United States, ranging from a study site in New York City (the most populous city in the United States) to less‐urban sites off Massachusetts. We quantified the trophic niche size and trophic niche overlap in three‐dimensional isotopic space and assessed spatial overlap in foraging habitat between species at both peri‐urban and less‐urban study sites. We found that for both species, birds at peri‐urban study sites had significantly larger trophic niches than birds from the less‐urban sites. Furthermore, for study sites where both species occurred, we found that overlap in trophic niche space and foraging habitats between species was lower at the peri‐urban study site than at the less‐urban site. These results suggest that peri‐urban environments may facilitate trophic niche expansion and decrease niche overlap in mobile generalist species, contrasting with previous studies showing increased trophic niche overlap in more isolated urban populations. Following further analysis, we found that trophic niche expansion was facilitated by both within‐ and between‐individual differences in foraging strategies. We posit that peri‐urban environments, particularly along coastal areas, can reduce interspecific competition between sympatric species by providing access to a variety of natural and anthropogenic diet items, especially for highly mobile generalist consumers that can access both natural and urban foraging areas. Research assessing how and at what scale peri‐urban systems influence wildlife is key to understanding how further global urbanization will shape ecosystem structures.

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Blood mercury concentrations in four sympatric gull species from South Western France: Insights from stable isotopes and biologging

Cited by 11 publications

References 103 publications

Physiological effects of PFAS exposure in seabird chicks: A multi-species study of thyroid hormone triiodothyronine, body condition and telomere length in South Western France

Physiological effects of PFAS exposure in seabird chicks: A multi-species study of thyroid hormone triiodothyronine, body condition and telomere length in South Western France

Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins

Peri‐urban systems alter trophic niche size and overlap in sympatric coastal bird species

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