Using Strontium Isotope Ratios to Estimate Inputs to Ecosystems

Gosz, James R.; Brookins, Douglas G.; Moore, Douglas I.

doi:10.2307/1309240

Cited by 78 publications

(40 citation statements)

References 32 publications

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“…They differ from other isotopes (H, C, N, O and S) in that they are unaffected by biological or chemical processes and the mass-dependent isotope fraction (Miller et al 1993). In addition, they provide information about the sample's provenance and related geologic processes, such as water-rock interaction and mixing of isotopically distinct materials (Gosz et al 1983, Miller et al 1993, Capo et al 1998, Barbieri 2002, Lyons et al 2002. In recent years, Sr isotope compositions have been increasingly applied to the studies of earth-surface processes and sedimentary environments.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, Sr isotope compositions have been increasingly applied to the studies of earth-surface processes and sedimentary environments. The 87 Sr/ 86 Sr ratios in various ecosystem pools and sedimentary environments are the results of mixing of Sr derived from different sources (Gosz et al 1983, Derry et al 1992, Ingram & Sloan 1992, Miller et al 1993. Based upon the differences in the compositions of various sources, Sr isotopes can be used as the source indicators and the tracers for the cycles of nutrients in the ecosystems (Graustein 1989, Palmer & Edmond 1992, Blum et al 1994, Blum & Erel 1995, Bailey et al 1996, Capo et al 1998, Barbieri 2002, Lyons et al 2002.…”

Section: Introductionmentioning

confidence: 99%

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HCl-soluble 87Sr/86Sr ratio in sediments impacted by penguin or seal excreta as a proxy for historical population size in the maritime Antarctic

Sun¹,

Zhu²,

Liu³

et al. 2005

Mar. Ecol. Prog. Ser.

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The strontium (Sr) isotopic compositions in the HCl-soluble and insoluble fractions of sediments impacted by penguin and seal excreta in the maritime Antarctic were analyzed. The HClsoluble phase of the sediments impacted by penguin guano has a high 87 Sr/ 86 Sr ratio (average 0.7087), close to the ratio in seawater (average 0.7092), suggesting that the 87 Sr/ 86 Sr ratios in the sediments are significantly impacted by penguin guano. The 87 Sr/ 86 Sr ratios in the HCl-soluble phase of the sediments impacted by seal excreta vary between 0.705066 and 0.706117, with an average of 0.705507, higher than those of the local bedrock, but lower than the ratio in modern seawater; they are interpreted to be a mixture of Sr from seal excreta (30 to 50%) and the weathering products of the local bedrock (50 to 70%). The Sr contributions from penguin guano and seal excreta were calculated using the 2-member isotope mixing equation, and they have a significant correlation with the historical penguin population size as estimated from other geochemical analyses and the seal hair density in the sediments, respectively. These results suggest that the 87 Sr/ 86 Sr ratios in the HCl-soluble fraction of sediments impacted by penguin or seal excreta can potentially be used as an indirect and new proxy for the historical population size of these sea animals in the maritime Antarctic.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

HCl-soluble 87Sr/86Sr ratio in sediments impacted by penguin or seal excreta as a proxy for historical population size in the maritime Antarctic

Sun¹,

Zhu²,

Liu³

et al. 2005

Mar. Ecol. Prog. Ser.

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show abstract

“…Nevertheless, their origin is often difficult to determine since multiple sources are possible for a given element. To solve this problem, Sr isotopes were first used by Gosz et al (1983) and Graustein and Armstrong (1983) with the objective of estimating the importance of weathering and atmospheric inputs to the ecosystems. Rocks and minerals of the same age but with different Rb/Sr concentration ratios generally display various 87 Sr/ 86 Sr due to 87 Rb decay with time.…”

Section: Introductionmentioning

confidence: 99%

Evidence of hydrological control of Sr behavior in stream water (Strengbach catchment, Vosges mountains, France)

Aubert

Probst

Stille

et al. 2002

Applied Geochemistry

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Sr ratios in stream water behave in 3 different ways depending on moisture and on hydrological conditions prevailing in the catchment. During low water flow periods (discharge < 9 l/s), a positive linear relationship exists between Sr isotope ratio and discharge, indicating the influence of radiogenic waters draining the saturated area during storm events. During high water flow conditions, rising discharges are characterized by significantly less radiogenic waters than the recession stages of discharge. This suggests a large contribution of radiogenic waters draining the deep layers of the hillslopes during the recession stages, particularly those from the more radiogenic north-facing slopes. These results allow one to confirm the negligible instantaneous incidence of rainwater on stream water chemistry during flood events, as well as the existence in the catchment of distinct contributive areas and reservoirs. The influence of these areas or reservoirs on the fluctuations of Sr concentrations and on Sr isotopic variations in stream water depends on both moisture and hydrological conditions. Hence, on a same bedrock type, 87 Sr/ 86 Sr ratios in surface waters can be related to flow rate. Consequently, discharge variations must be considered as a pre-requisite when using Sr isotopes for calculating weathering rates in catchments, particularly to define the range of variations of the end-members.

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“…Normally, ratios of stable isotopes of an element are used to characterize a rate process because of the ability of organisms to discriminate against the heavier isotopes of low atomic weight elements (Bender 1968;Siegler et al 1976). Graustein (198 l), Graustein & Armstrong (1983) and Gosz et al (1983) reported on the potential for using isotopes of strontium to quantify atmospheric inputs of material to a study area in New Mexico. These isotopes are valuable because organisms are unable to differentiate among the isotopes of this heavy element and differences in ratios of 87Sr/86Sr among samples reflect different geological sources for those samples.…”

Section: Introductionmentioning

confidence: 99%

Strontium isotope studies of atmospheric inputs to forested watersheds in New Mexico

Gosz

Moore

1989

Biogeochemistry

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Abstract. Stable isotopes of strontium provide a unique quantification of ecosystem processes because organisms do not differentiate between them. For landscapes with contrasting geologies, these isotopes can identify atmospheric source material from local weathered material. This study quantified the input of strontium, distribution within the ecosystem, canopy capture versus leaf leachate, canopy loss, and Sr increment in biomass from an atmospheric origin. Forest ecosystems were studied along an elevational gradient in New Mexico. Spruce forests had a much greater capacity for capturing atmospheric Sr than aspen forests; however, aspen contained more total atmospheric Sr in their tissues because of greater uptake rates and the ability to utilize atmospheric deposited Sr before the initiation of the aspen forest. This technique has excellent capabilities for estimating the relative importance of atmospheric and weathering inputs to certain ecosystems.

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Using Strontium Isotope Ratios to Estimate Inputs to Ecosystems

Cited by 78 publications

References 32 publications

HCl-soluble 87Sr/86Sr ratio in sediments impacted by penguin or seal excreta as a proxy for historical population size in the maritime Antarctic

HCl-soluble 87Sr/86Sr ratio in sediments impacted by penguin or seal excreta as a proxy for historical population size in the maritime Antarctic

Evidence of hydrological control of Sr behavior in stream water (Strengbach catchment, Vosges mountains, France)

Strontium isotope studies of atmospheric inputs to forested watersheds in New Mexico

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