Magnesium isotopes reveal bedrock impacts on stream organisms

Nitzsche, Kai Nils; Kato, Yoshikazu; Shin, Ki-Cheol; Tayasu, Ichiro

doi:10.1016/j.scitotenv.2019.06.209

Cited by 8 publications

(9 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Filter‐feeding caddisflies (Hydropsychidae spp, S. marmorata ) usually had similar or slightly elevated δ 26 Mg values than stream water in agreement with our previous findings (Nitzsche et al 2019). Again, we suggest the direct Mg uptake from the water via anal papillae as the main Mg source (Komnick 1977).…”

Section: Discussionsupporting

confidence: 92%

“…S1) indicates that land use (forest in upper reaches vs. residential areas and rice paddy fields in lower reaches) had only a little effect on Mg and Zn sources and/or indicates the overlap between isotope signatures of natural and anthropogenic sources. While δ 26 Mg of stream water is largely determined by the local geology (Brenot et al 2008, Tipper et al 2008, Nitzsche et al 2019, larger impacts on δ 66 Zn of stream water and consumers could exist for more severe contamination such as from urban runoff and sewage from wastewater treatment plants (Chen et al 2008(Chen et al , 2009.…”

Section: Variability Of Isotopic Ratios Across Feeding Habitsmentioning

confidence: 99%

“…Similarly, Mg and Zn isotope fractionation during intestinal absorption from the diet could be suspected for aquatic insects. Recent evidence exists that potential differences in δ 26 Mg values across sources are reflected in stream organisms from streams with contrasting geology (Nitzsche et al 2019). These authors suggested stream water was the main Mg source to caddisfly larvae and small goby, while grazing mayfly, leaf‐shredding crane fly, and predatory stonefly larvae rather relied on the diet as main Mg source.…”

Section: Introductionmentioning

confidence: 99%

“…These authors suggested stream water was the main Mg source to caddisfly larvae and small goby, while grazing mayfly, leaf‐shredding crane fly, and predatory stonefly larvae rather relied on the diet as main Mg source. Nevertheless, Nitzsche et al (2019) did not determine δ 26 Mg values of dietary sources crucial in understanding Mg sources and Mg isotopic fractionation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Variability Of Isotopic Ratios Across Feeding Habitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Stable carbon isotopes (δ 13 C) have been useful as diet tracer in stream food web studies when aquatic and terrestrial resources can be separated using δ 13 C values (Finlay 2001). In addition to δ 13 C, several other isotope tracers, such as hydrogen (Doucett et al 2007), mercury (Tsui et al 2014), and magnesium (Nitzsche et al 2019), have been used for tracing material flow at the land–water interface. Radiocarbon natural abundances (Δ 14 C) have also drawn attention for estimating carbon sources to stream food webs (e.g., Caraco et al 2010; Ishikawa et al 2014; Fellman et al 2015; Bellamy et al 2017).…”

mentioning

confidence: 99%

Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web

Ishikawa

Finlay

Uno

et al. 2020

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

Radiocarbon natural abundance (Δ 14 C) has emerged as a useful dietary tracer in freshwater ecology for the past decade, yet its applicability for separating aquatic and terrestrial resources has not been examined quantitatively. Here, we report Δ 14 C values of stream invertebrates in different functional feeding groups collected from the upper South Fork Eel River watershed, northern California. We found that algae-grazing insect larvae show low Δ 14 C values (−43.1 AE 21.8‰, mean AE standard deviation, N = 6), reflecting the signal of dissolved inorganic carbon weathered from ancient inorganic carbon or respiration of old organic carbon. In contrast, the Δ 14 C values of leaf-shredding insect larvae (21.7 AE 31.9‰, N = 5) were close to those of contemporary atmospheric CO 2 except at the SF Eel River where algal production was highest. The Δ 14 C values of predators (−6.1 AE 35.7‰, N = 14) were intermediate between those of grazers and shredders. In a Bayesian mixing model, Δ 14 C provided a more ecologically realistic estimate for terrestrial vs. aquatic source contributions to invertebrates with lower uncertainty (i.e., narrower credible interval) than did the stable carbon isotopes (δ 13 C). These results demonstrate that Δ 14 C can be used, in combination with δ 13 C, to more precisely estimate organic matter sources to stream animals. 14 C-dead (i.e., Δ 14 C = −1000‰) inorganic carbon into the

show abstract

Calcium and strontium stable isotopes reveal similar behaviors of essential Ca and nonessential Sr in stream food webs

et al. 2022

Self Cite

View full text Add to dashboard Cite

Recent studies showed the potential of stable isotopes of the macronutrient calcium (δ 44/40 Ca) and nonessential strontium (δ 88/86 Sr) as new trophic level indicators in terrestrial vertebrates and marine teleost fishes. In this study, we tested whether similar Ca and Sr isotopic fractionation trends existed in macroinvertebrate-dominated stream food webs compared to vertebrates despite their physiological differences. We have determined the δ 44/40 Ca and δ 88/86 Sr values as well as the 87 Sr/ 86 Sr ratios of stream macroinvertebrates and small gobies and their potential metal sources (stream water, periphyton, and terrestrial plant litter) in upper and lower reaches of two streams in the Lake Biwa catchment, central Japan. The 87 Sr/ 86 Sr ratios revealed that stonefly nymphs, crustacea, and gobies mostly relied on aquatic Sr sources. Higher 87 Sr/ 86 Sr ratios of some crane fly and caddisfly larvae, mayfly, dobsonfly, and dragonfly nymphs indicated greater terrestrial contributions via plant litter.Positive correlations between the δ 44/40 Ca and δ 88/86 Sr values implied that similar Ca and Sr sources existed, and that Ca and Sr stable isotopes underwent similar fractionation trends although Sr was not essential. The δ 44/40 Ca and partly the δ 88/86 Sr values were positively correlated with Sr/Ca ratios and negatively with δ 15 N values indicating trophic effects on Ca and Sr stable isotopes.The enrichment of 44 Ca and 88 Sr in large filter-feeding caddisfly larvae was a notable exception from these trophic trends. Our data confirm that the trophic 44 Ca and 88 Sr depletion observed for marine teleost fishes and terrestrial vertebrates also applied to macroinvertebrate-dominated stream food webs despite their different physiologies indicating that shared mechanisms of Ca and Sr isotopic fractionation may exist at the cellular or molecular level between these taxa.

show abstract

Magnesium isotopes reveal bedrock impacts on stream organisms

Cited by 8 publications

References 54 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

Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web

Calcium and strontium stable isotopes reveal similar behaviors of essential Ca and nonessential Sr in stream food webs

Contact Info

Product

Resources

About