Variation in Zn, C, and N isotope ratios in three stream insects

Evans, R. Douglas; Wang, Wei; Evans, Hayla E.; Georg, R. Bastian

doi:10.1139/facets-2016-0023

Cited by 11 publications

(12 citation statements)

References 47 publications

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“…δ 66 Zn patterns could not be generalized due to variations in δ 66 Zn values of taxa across streams (Ado River vs. Yasu River), across locations (upper vs. lower), and given the small range in δ 66 Zn values across taxa of different feeding habits within sampling locations. For instance, the similar δ 66 Zn values between stoneflies and caddisflies agree with similar values in predatory stonefly nymphs and leaf‐shredding caddisfly larvae in the Jackson Creek in Ontario, Canada (Evans et al 2016), indicating similar Zn sources. We conclude that it is challenging to distinguish feeding habits based on δ 66 Zn values although predatory fishes and dragonfly nymphs show an expected tendency to lower δ 66 Zn values as observed for terrestrial and marine mammals (Jaouen et al 2013, 2016 a , b ).…”

Section: Discussionsupporting

confidence: 60%

“…S2, S3), suggesting that δ 26 Mg and δ 66 Zn cannot be simply used to assess relative contributions of plant litter and periphyton as main Mg and Zn sources, and that δ 26 Mg and δ 66 Zn cannot be related to trophic level. Similarly, δ 66 Zn could not be related to δ 13 C and δ 15 N values in predatory stonefly nymphs and shredding caddisfly larvae in the Jackson Creek in Ontario, Canada (Evans et al 2016). Thus, our data indicate (1) that different Mg, Zn, C, and N sources existed, (2) Mg and Zn isotopic fractionation during dietary Mg and Zn uptake irrespective of trophic position, (3) Mg and Zn isotopic fractionation related to insect growth and metamorphosis, and (4) variable rates of aqueous Zn uptake among taxa in relation to factors such as phylogeny and development (Buchwalter et al 2008, Poteat and Buchwalter 2014, Cain et al 2019) and to metal partitioning between aqueous and solid phases that could influence the relative contributions of aqueous and dietary metal uptake (Cain et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Using δ 66 Zn values, Wanty et al (2017) showed that approximately 85% Zn in grazing mayfly nymphs originated from diatom as diet. In a field study, similar δ 66 Zn values in predatory stonefly nymphs and leaf-shredding caddisfly larvae in a Canadian creek indicated that similar Zn sources existed (Evans et al 2016). Nevertheless, the number of feeding guilds was restricted in Evans et al (2016) and larger differences in δ 66 Zn may exist for aquatic insects that rely on other metal sources.…”

Section: Introductionmentioning

confidence: 96%

“…In a field study, similar δ 66 Zn values in predatory stonefly nymphs and leaf-shredding caddisfly larvae in a Canadian creek indicated that similar Zn sources existed (Evans et al 2016). Nevertheless, the number of feeding guilds was restricted in Evans et al (2016) and larger differences in δ 66 Zn may exist for aquatic insects that rely on other metal sources. For instance, freshwater diatoms were enriched in 66 Zn by up to 0.2‰ compared to the growth medium (Gélabert et al 2006) and lower δ 66 Zn values were found in plant leaves relative to shoots and roots (Viers et al 2007).…”

Section: Introductionmentioning

confidence: 96%

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Magnesium and zinc stable isotopes as a new tool to understand Mg and Zn sources in stream food webs

et al. 2020

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Non‐traditional stable isotopes of metals were recently shown as new dietary tracers in terrestrial and marine mammals. Whether these metal stable isotopes can be used to understand feeding habits in stream food webs is not known yet. In this study, we explored the potential of stable isotopes of essential Mg (δ26Mg) and Zn (δ66Zn) as a new tool in stream ecology. For this purpose, we determined δ26Mg and δ66Zn values of stream organisms and their potential metal sources in upper and lower reaches of two streams in the Lake Biwa catchment, Central Japan. Our goals were (1) to explore variations in δ26Mg and δ66Zn across organisms of different feeding habits and (2) to understand Mg and Zn sources to stream organisms. Overall, δ26Mg and δ66Zn values of organisms were neither related to each other, nor to δ13C and δ15N values, indicating different elemental sources and factors controlling isotopic fractionation depending on element and taxa. Low δ26Mg values in filter‐feeding caddisfly larvae and small gobies indicated aqueous Mg uptake. Higher δ26Mg values in leaf‐shredding crane fly and grazing mayfly larvae suggested Mg isotopic fractionation during Mg uptake from the diet. While the δ26Mg values of stonefly nymphs reflected those of caddisfly larvae as a potential prey, the highest δ26Mg values found in dobsonfly nymphs can be explained by 26Mg enrichment during maturing. δ66Zn values of caddisfly and mayfly larvae indicated Zn was a mixture of aqueous and dietary available Zn, while higher δ66Zn values in crane fly larvae pointed to Zn isotopic fractionation during Zn uptake from plant litter. δ66Zn values in stonefly and dobsonfly nymphs were often in the range of those of caddisfly larvae as their prey, while dragonfly nymphs and small goby were depleted in 66Zn relative to their dietary Zn sources. We conclude that δ26Mg is a promising indicator to assess Mg sources in stream ecology depending on taxa, while the use of δ66Zn is limited due to the complexity in Zn sources.

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

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Magnesium and zinc stable isotopes as a new tool to understand Mg and Zn sources in stream food webs

et al. 2020

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“…13 Beyond this is a relatively small body of socio-legal examinations of the broader significance of ECtHR religious freedom jurisprudence in terms of secularisation and the experience of religious minorities. 14 There is very limited attention to impact at the national level there is a lacuna in the scholarship as regards the influence of these judgements at the local and national level, in policy terms and more so in terms of their discursive impact.…”

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confidence: 99%

Directions in Religious Pluralism in Europe: Mobilizations in the Shadow of European Court of Human Rights Religious Freedom Jurisprudence

Fokas¹

2015

Oxford Journal of Law and Religion

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Over the last twenty years the European Court of Human Rights has evolved into a conspicuous, often contentious, force in the multilevel battles over the place of religion in the European public sphere. In light of scholarly debates questioning the direct effects of courts on the issues they address, this paper explores how the nature and extent of European juridical influence on religious pluralism are better understood through developments taking place 'in the shadow' of the Court. Specifically, what is the aftermath of the Court's religion jurisprudence in terms of its applications at the grassroots level? And how might legal and political elites operating at the national and international levels influence the Court's engagement with religion? These questions are important because ECtHR case law will shape, to a large extent, both local and national case law and -less conspicuously but no less importantly -grassroots developments in the promotion of or resistance to religious pluralism. The latter will, in turn, influence the future of the ECtHR caseload.The European public square has, in the last twenty years and increasingly so, been inundated with controversies and debates broadly conceived around the place of religion in the public sphere. In spite of (and, some would argue, because of) popular and scholarly expectations of religion's retreat in Europe, issues such as freedom of religious expression, freedom of speech versus protection against blasphemy, and the public display of religious symbols loom large in the workplace, in schools, in media coverage, etc. throughout Europe, at the local, national, and supranational level. The presence of Islam in Europe has acted as a catalyst in many debates on religion in Europe, but these debates have now grown to encompass much broader assumptions about the nature of religious communities, their relationship to state institutions, and the place of minority religious communities in society. In short, the debates have 1 This research is supported by a grant from the European Research Council. I would like to thank the research team in the Grassrootsmobilise programme for their insights contributed during discussions of an earlier version of this text.2 come to encompass the place, role and rights of the 'Christian majority' (however passively and vicariously Christian it may be in most of Europe) in relation to a plurality of minority religions that are present in Europe. It is against this backdrop of shifting attitudes towards religion-state relations and multitude of Christian, Muslim, secular, and otherwise non-religious voices, that the European Court of Human Rights jurisprudence on religion issues has emerged to add its own voice.

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Incorporation of zinc and copper by insects of different functional feeding groups in agricultural streams

Loureiro

Menegat

Restello

et al. 2018

Environ Sci Pollut Res

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Metals from agricultural areas are responsible for soil contamination and are carried into aquatic ecosystems. In this context, we evaluated the incorporation of zinc and copper via three feeding strategies (shredding, herbivory and predators) in assemblages of stream insects. We collected aquatic insects in five agricultural streams and five natural streams in Atlantic forest biome to investigate the accumulation of copper and zinc in insects with different feeding strategies. We found no significant differences in the concentrations of copper and zinc between stream types among all insect-feeding groups compared. However, we observed that copper accumulate concentrations differed significantly among the shredders and predators in relation to their resource in streams, while zinc concentrations differed in the two feeding strategy. Therefore, the investigation of the transfer of copper and zinc by different feeding strategies in streams can contribute to the understanding of changes in aquatic insect assemblages related to agricultural activities around streams.

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Variation in Zn, C, and N isotope ratios in three stream insects

Cited by 11 publications

References 47 publications

Magnesium and zinc stable isotopes as a new tool to understand Mg and Zn sources in stream food webs

Magnesium and zinc stable isotopes as a new tool to understand Mg and Zn sources in stream food webs

Directions in Religious Pluralism in Europe: Mobilizations in the Shadow of European Court of Human Rights Religious Freedom Jurisprudence

Incorporation of zinc and copper by insects of different functional feeding groups in agricultural streams

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