A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Forray, Ferenc L.; Onac, Bogdan P.; Tanţău, Ioan; Wynn, Jonathan G.; Tămaș, Tudor; Coroiu, I.; Giurgiu, Alexandra

doi:10.1016/j.quascirev.2015.05.022

Cited by 45 publications

(28 citation statements)

References 78 publications

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“…We refer the reader to the introductory paper of this Special Issue [20] for an overview of these controlling mechanisms. In addition to δ 13 C spel and δ 18 O spel (the most frequently investigated and most abundant geochemical parameters in speleothems studies in the region), stable isotope ratios in certain non-calcareous cave deposits, such as cave ice [21] and guano deposits [22][23][24] have also been explored for their paleoclimatological potential.…”

Section: Introductionmentioning

confidence: 99%

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

et al. 2019

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The region comprising of East Central Europe, South East Europe and Turkey contributed to the SISAL (Speleothem Isotopes Synthesis and AnaLysis) global database with stable carbon and oxygen isotope time-series from 18 speleothems from 14 caves. The currently available oldest record from the studied region is the ABA-2 flowstone record (Abaliget Cave; Hungary) reaching back to MIS 6. The temporal distribution of the compiled 18 records from the region points out a ~20 kyr-long period, centering around 100 ka BP, lacking speleothem stable isotope data. The regional subset of SISAL_v1 records displays a continuous coverage for the past ~90 kyr for both δ13C and δ18O, with a mean temporal resolution of ~12 yr for the Holocene, and >50 yr for the pre-Holocene period. The highest temporal resolution both for the Holocene and the pre-Holocene was achieved in the So-1 record (Sofular Cave; Turkey). The relationship between modern day precipitation δ18O (amount weighted annual and winter season mean values; 1961–2017) and climatological parameters was evaluated. The strong positive correlation found in East Central Europe reinforces the link between modern day precipitation δ18O, temperature and large-scale circulation (North Atlantic Oscillation) expected to be preserved in the speleothem δ18O record; while a negative relationship was documented between precipitation amount and oxygen isotope compositions in South East Europe. Variations of δ13C values are primarily interpreted as reflecting dry/wet periods across the region. Elevation gradients from three non-overlapping periods of the last ~5 kyr indicated elevation gradients around −0.26‰ per 100 m−1 for calcite δ18O.

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Section: Introductionmentioning

confidence: 99%

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

et al. 2019

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“…In addition, pollen preserved in guano has been shown to be a reliable resource for reconstruction of vegetation dynamics (Carrión et al ., ; Geantă et al ., ). This type of proxy record is ideal for the study of the MWP and LIA in Romania as deposits have frequently been found to be as old as AD 800 (Geantă et al ., ; Onac et al ., ) with guano accumulation often occurring through parts of the LIA (Forray et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Less water‐stressed conditions create the opposite effect, wherein little competitive advantage is afforded to plants with high WUE, leading to higher carbon isotopic discrimination (lower δ 13 C values). This variation in plant foliage δ 13 C values may be transferred to bat guano and can therefore be used to reconstruct the hydroclimate within the foraging range of the bat colony (Forray et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Cave bat guano has the potential to be a very useful resource for paleoclimate and paleoecological reconstructions. Studies using δ 13 C values have provided information related to the shift between C 3 and C 4 plants as well as variation in plant water‐use efficiency (Des Marais et al ., ; Mizutani et al, ,b; Bird et al ., ; Wurster et al ., ; Forray et al ., ; Royer et al ., ). Guano‐derived δ 15 N values have also been used to reconstruct regional winter precipitation (Cleary et al ., ) and to assess the anthropogenic and climatic influence on a regional nitrogen pool (Cleary et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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A guano‐derived δ¹³C and δ¹⁵N record of climate since the Medieval Warm Period in north‐west Romania

Cleary

Onac

Tanţău

et al. 2018

J Quaternary Science

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A 285-cm core of bat guano was recovered from M agurici Cave in north-west Romania and analyzed for d 13 C, d 15 N and pollen. Guano deposition occurred from AD 881 until 1240 and from AD 1651 to 2013, allowing for the interpretation of summer variations in precipitation and temperature during the Medieval Warm Period (MWP) and the Little Ice Age (LIA). A 2‰ increase in d 13 C, 1.5‰ decrease in d 15 N, and the presence of Ulmus, Quercus and Carpinus betulus indicate a warm and dry MWP occurred in the region. The lack of deposition during the beginning of the LIA suggests a possible climate-induced change in prey availability resulting in bats vacating the cave. Variation of d 13 C values between À25 and À23‰ at AD 1650 (LIA) indicates similar drier conditions as at the end of MWP. However, a 2‰ decrease in d 13 C values that occurred between AD 1790 and 1900 suggests climate was trending towards wetter conditions at the end of the LIA. From AD 1938 to 2013, d 13 C values appear to be more influenced by temperature, indicating that this parameter had a more significant effect on carbon discrimination than water availability.

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“…Although the longest history of karst research leads back to this region [1], stable isotope investigations of calcareous speleothems began relatively late, at the very end of the 20 th century [23,24]. Stable isotope ratios of certain non-calcareous cave deposits, such as cave ice [25,26] and guano deposits [27][28][29], have a pronounced paleoclimatological potential in the region, however stable carbon and oxygen isotope ratios of carbonate deposits became the most frequently investigated and most abundant geochemical parameter in speleothems studies in Eastern Europe and Turkey.…”

Section: Introductionmentioning

confidence: 99%

Speleothem Stable Isotope Records from Eastern Europe & Turkey

Kern¹,

Demény²,

Hatvani³

2018

Preprint

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The region of Eastern Europe & Turkey contributed to the SISAL (Speleothem Isotopes Synthesis and AnaLysis) global database with stable carbon- and oxygen isotope time-series from 18 entities from 14 cave systems. The currently available oldest record from this region is the ABA-2 flowstone record (Abaliget Cave; Hungary) reaching back to MIS 6. The temporal distribution of the compiled 18 entities points out a ~20-kyr-long period, centering around 100 ka, lacking speleothem stable isotope record in the region. The regional subset of SISAL_v1 records displays a continuous coverage for the past ~90 kyr for both δ18O and δ13C, with a mean temporal resolution of ~12 yr for the Holocene, and >50 yr for the pre-Holocene period. The highest temporal resolution both for the Holocene and the pre-Holocene was achieved in the So-1 record (Sofular Cave; Turkey). Assessing the data, an important split was found regarding the climatic interpretation of speleothem δ18O. While the oxygen isotope composition of more continental formations is thought to reflect mainly temperature variations and changes in moisture transport trajectories, it may strongly reflect fluctuations of precipitation amount in the southern part of the region. Variations of δ13C primarily interpreted as humidity changes reflecting dry/wet periods across the region. Elevation gradients from three non-overlapping time periods from the region - for the last 5kyr - indicated systematically prevailing elevational gradients around -0.26&permil; 100m-1 in δ18O. The regional comparison of SISAL_v1 speleothem δ18O and the temporal distribution of coarsely crystalline cryogenic cave carbonate occurrences back to 45ka does not appear to confirm the finding that occurrence of the latter coincides with the warming from stadial to interstadial conditions.

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A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Cited by 45 publications

References 78 publications

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

A guano‐derived δ¹³C and δ¹⁵N record of climate since the Medieval Warm Period in north‐west Romania

Speleothem Stable Isotope Records from Eastern Europe & Turkey

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A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Cited by 45 publications

References 78 publications

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

Speleothem Records from the Eastern Part of Europe and Turkey—Discussion on Stable Oxygen and Carbon Isotopes

A guano‐derived δ13C and δ15N record of climate since the Medieval Warm Period in north‐west Romania

Speleothem Stable Isotope Records from Eastern Europe &amp; Turkey

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A guano‐derived δ¹³C and δ¹⁵N record of climate since the Medieval Warm Period in north‐west Romania

Speleothem Stable Isotope Records from Eastern Europe & Turkey