Compound-specific stable carbon and hydrogen isotope analyses of late-Holocene vegetation and precipitation change at Laguna Los Mangos, Costa Rica

Yanuskiewicz, Elizabeth A.; Lane, Chad S.; Horn, Sally P.; Johanson, Erik; Gamble, Douglas W.

doi:10.1016/j.quaint.2021.08.018

Cited by 8 publications

(17 citation statements)

References 95 publications

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“…Deviations between δ 13 C C29 (Yanuskiewicz et al, 2022) and δ 13 C TOC (Johanson et al, 2019) ca. 4190, 4050, 3700, and 3360 cal yr BP may have resulted from variable algal productivity and its differential effects on δ 13 C TOC (Yanuskiewicz, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Sedimentation rate (cm/yr), charcoal influx (mm 2 /cm 2 /yr), pollen composition, organic material (%OM), nitrogen (%N), C:N ratio, elemental composition, and δ 13 C TOC records are from Johanson et al (2019). δ 2 H C29 and δ 13 C C29 records are from Yanuskiewicz et al (2022). Herbaceous pollen types included Poaceae , Cyperaceae , Asteraceae and Amaranthaceae , while arboreal/shrub types included Urticales diporate and triporate, Hedyosmum , Ficus , Burseraceae , Myrsine , Alchornea ( Euphorbiaceae ), Piper , Melastomataceae/Combretaceae , Cecropia , Sapium ( Euphorbiaceae ), Anacardiaceae , Ulmus , Myrica , Alnus , Podocarpus , Weinmannia , and Quercus.…”

Section: Discussionmentioning

confidence: 99%

“…550–100 cal yr BP (Lane et al, 2011). In the Caribbean, the TCD and the LIA were both expressed as periods of drought attributed to Atlantic and Pacific climate variability, specifically southward shifts in the ITCZ (Bhattacharya et al, 2017; Lane et al, 2011; Sachs et al, 2009) and increased ENSO frequency (Krishnaswamy et al, 2001; Yanuskiewicz et al, 2022). The TCD, which occurred in two distinct phases of severe drought from 1200 to 1075 cal yr BP and 950–875 cal yr BP (Hodell et al, 2005), has also been attributed to the effects of widespread deforestation and agriculture (Cook et al, 2012; Oglesby et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Response of diatom communities to climate and human disturbance: A 4200-year record from Costa Rica

Bitting,

Johanson,

Haberyan

et al. 2023

The Holocene

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This study integrates diatom analysis with existing records of pollen, charcoal, elemental composition, and stable light isotopes to expand upon the 4200-year history of human activity and climate change from Laguna Los Mangos in southern Pacific Costa Rica. We counted diatoms in peroxide-treated samples and analyzed community composition using cluster analysis, revealing four distinct assemblage zones with diatom variability most closely correlated with phosphorus, titanium, and organic content. The earliest assemblage (Zone D, 4150–3430 cal yr BP) was dominated by Encyonema silesiacum and Nitzschia incognita and aligned with a period of deforestation, erosion, and abundant macrophytes. Gomphonema affine proliferated in Zone C (3430–2450 cal yr BP), reflecting increased pH and productivity likely caused by agriculture-induced nutrient loading. We attributed the preservation gap from 3290 to 2970 cal yr BP in Zone C to silica depletion and erosional deposition that induced decline in diatom abundance by diluting valve concentrations in lake sediments. Nitzschia incognita and G. affine became the dominant taxa in Zone B (2450–1400 cal yr BP), likely reflecting eutrophy, increasing conductivity, and drying climate. Dominance of Diadesmis confervacea indicated reduced lake level in Zone A (1400 cal yr BP–modern) at the onset of the Terminal Classic Drought (TCD). A hiatus in the record indicates lake desiccation from 950 to 450 cal yr BP. During the Little Ice Age (LIA), diatoms reflect conditions similar to Zone B indicating increased lake level, circumneutral pH, and eutrophy. Refilling of the lake indicates increased precipitation during the LIA despite evidence of severe regional drought reported at other sites. Variable precipitation during this period likely resulted from the combined effects of Spanish contact, agricultural collapse, forest recovery, and shifts in Atlantic and Pacific climate forcing mechanisms. Overall, the Los Mangos diatom record reflects shallow, slightly alkaline, eutrophic conditions influenced by nutrient enrichment, erosion, and deforestation associated with maize agriculture.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Response of diatom communities to climate and human disturbance: A 4200-year record from Costa Rica

Bitting,

Johanson,

Haberyan

et al. 2023

The Holocene

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“…A promising application of δ 2 Halkane measurements in mountainous regions is to infer the strength of the orogenic rainshadow over time to assess orographic history (Hren et al 2010, Zhuang et al 2014, Burrington 2015, Massa et al 2021, Yanuskiewicz et al 2022. Using δ 2 Halkane from sedimentary rocks to infer the strength of a rainshadow in the geologic past requires some additional considerations beyond those needed for soils and plants.…”

Section: Reconstructing Rainshadow Strength In the Geologic Past: Pro...mentioning

confidence: 99%

Rainshadow effect on hydrogen isotopes in leaf wax n-Alkanes across the Cascade Mountains of Washington, USA

Sisley

Wolhowe

Rowe

et al. 2023

Organic Geochemistry

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“…With the establishment and development of gas chromatographycombustion-isotope ratio mass spectrometry (GC/C/IRMS), this technique has been widely used in geoscience. At present, the compound-specific δ 13 C values of lipids are most commonly applied in the study of paleoclimate, paleoenvironment, and paleovegetation restoration, [1][2][3][4][5][6] which can be used to trace the sources of sediments, 7,8 speculate the vegetation changes, 9,10 and analyze the environmental pollution and organic pollution. [11][12][13][14] In addition, the compound-specific carbon isotope analysis using GC/C/IRMS has also been widely used in environmental science, [15][16][17] life science, [18][19][20][21][22] and other fields.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the accuracy and reliability of compound‐specific carbon isotopic analysis using gas chromatography‐combustion‐isotope ratio mass spectrometry with the addition of a reduction furnace

Cao

Liu

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale: Gas chromatography-combustion-isotope ratio mass spectrometry (GC/C/ IRMS) is widely used for compound-specific carbon isotopic analysis. However, current isotopic analysis systems utilize the GC IsoLink combustion reactor, and independent reduction furnaces are not implemented. Therefore, whether this limitation in furnace use affects the precision of compound-specific carbon isotopic analysis needs to be evaluated.

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Compound-specific stable carbon and hydrogen isotope analyses of late-Holocene vegetation and precipitation change at Laguna Los Mangos, Costa Rica

Cited by 8 publications

References 95 publications

Response of diatom communities to climate and human disturbance: A 4200-year record from Costa Rica

Response of diatom communities to climate and human disturbance: A 4200-year record from Costa Rica

Rainshadow effect on hydrogen isotopes in leaf wax n-Alkanes across the Cascade Mountains of Washington, USA

Evaluating the accuracy and reliability of compound‐specific carbon isotopic analysis using gas chromatography‐combustion‐isotope ratio mass spectrometry with the addition of a reduction furnace

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