Sr isotopes as a tracer of weathering processes and dust inputs in a tropical granitoid watershed, Luquillo Mountains, Puerto Rico

Pett-Ridge, J.; Derry, Louis A.; Kurtz, A. C.

doi:10.1016/j.gca.2008.09.032

Cited by 113 publications

(82 citation statements)

References 80 publications

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“…The Rio Icacos watershed has been the subject of numerous soil geomorphology and weathering studies that indicate that the surface soil has experienced ~120 ka of pedogenesis (e.g. Brown et al, 1998;Stonestrom et al, 1998;Riebe et al, 2003;Pett-Ridge et al, 2009b). The LG1 site is underlain by the Rio Blanco stock, an early Tertiary quartz diorite pluton.…”

Section: Puerto Rico Site Descriptionmentioning

confidence: 99%

Molybdenum isotope fractionation in soils: Influence of redox conditions, organic matter, and atmospheric inputs

Siebert

Pett-Ridge

Opfergelt

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Puerto Rico Site Descriptionmentioning

confidence: 99%

Molybdenum isotope fractionation in soils: Influence of redox conditions, organic matter, and atmospheric inputs

Siebert

Pett-Ridge

Opfergelt

et al. 2015

Geochimica et Cosmochimica Acta

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“…Previous research has contributed to our understanding of the factors controlling the mixing of multiple Sr sources in soils and ecosystems (Kennedy et al 1998, Nakano et al 2001, Pozwa et al 2002, Bern et al 2005, Pett-Ridge et al 2009a, Pett-Ridge et al 2009b). The contribution of atmospherically derived Sr to the soluble Sr in soil depends mostly on the magnitude of the bedrock weathering flux.…”

Section: Model Formulationmentioning

confidence: 99%

Mapping multiple source effects on the strontium isotopic signatures of ecosystems from the circum‐Caribbean region

2012

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Citation: Bataille, C. P., J. Laffoon, and G. J. Bowen. 2012. Mapping multiple source effects on the strontium isotopic signatures of ecosystems from the circum-Caribbean region. Ecosphere 3 (12) Sr from the circum-Caribbean region (Antilles and Mesoamerica). Although the bedrock-only method performs relatively well in Mesoamerica (n ¼ 99, MAE ¼ 0.00011, RMSE ¼ 0.00073), its prediction accuracy is lower for the Antillean dataset (n ¼ 287, MAE ¼ 0.0021, RMSE ¼ 0.0027). In comparison, the new multiple source model, which accounts for the deposition of sea salt and mineral dust aerosols, performs comparably well in predicting the observed 87 Sr/ 86 Sr values in both datasets (MAE ¼ 0.00040, RMSE ¼ 0.00087 and MAE ¼ 0.00014, RMSE ¼ 0.0010). This study underscores the potential of using process-oriented spatial modeling to improve the predictive power of Sr isoscapes over large spatial scales and to refine sampling strategies and bioavailable Sr dataset interpretations for provenance studies.

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“…Among all coastal crocodylians (filled symbols in Fig. 4A Sr ratios that average around 0.7179, substantially higher than seawater (Muhs et al 2007, Pett-Ridge et al 2009). This provides a plausible mechanism for having high 87 Sr/ Sr ratios, the tight linear correlation in Fig.…”

mentioning

confidence: 92%

Estimating marine resource use by the American crocodile Crocodylus acutus in southern Florida, USA

Wheatley¹,

Peckham²,

Newsome³

et al. 2012

Mar. Ecol. Prog. Ser.

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Alligators and crocodiles differ in their physiological capacity to live in saline waters. Crocodiles can tolerate high-salinity water, at least for limited timeframes, whereas alligators and their close relatives cannot. Experiments have placed different crocodylians in various water salinities to document physiological responses, but no study has estimated the extent to which natural populations of crocodylids can live independent of fresh water. Here we estimated marine food and perhaps seawater contributions to a population of American crocodile Crocodylus acutus in southernmost Florida, USA. We evaluated the use of carbon, oxygen, and strontium isotopes as tracers of marine versus terrestrial sources. We compared C. acutus isotopic values to those of marine reptiles (marine iguanas and Pacific loggerhead turtles) and to American alligators, which require fresh water. We found that freshwater reptiles can be discriminated from those that drink seawater (or survive on metabolic and prey-included water in saline habitats) based on the magnitude of population-level oxygen isotope variation in bioapatite, whereas mean carbon isotope values discriminate between marine versus terrestrial food consumption. We used a 2 endmember (seawater and fresh water) mixing model to calculate percentage of marine resources used by C. acutus. Results indicate that adult C. acutus in southern Florida use marine food about 65% of the time and seawater or water gleaned from marine food about 80% of the time. This suggests that behavioral osmoregulatory techniques (i.e. seeking fresh water specifically for drinking, as suggested by other researchers) may not be necessary and that C. acutus is capable of being largely ecologically independent of fresh water.

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Sr isotopes as a tracer of weathering processes and dust inputs in a tropical granitoid watershed, Luquillo Mountains, Puerto Rico

Cited by 113 publications

References 80 publications

Molybdenum isotope fractionation in soils: Influence of redox conditions, organic matter, and atmospheric inputs

Molybdenum isotope fractionation in soils: Influence of redox conditions, organic matter, and atmospheric inputs

Mapping multiple source effects on the strontium isotopic signatures of ecosystems from the circum‐Caribbean region

Estimating marine resource use by the American crocodile Crocodylus acutus in southern Florida, USA

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