Holocene environmental record from lake sediments in the Bokanjačko blato karst polje (Dalmatia, Croatia)

Ilijanić, Nikolina; Miko, Slobodan; Hasan, Ozren; Bakrač, Koraljka

doi:10.1016/j.quaint.2018.01.037

Cited by 15 publications

(13 citation statements)

References 49 publications

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“…11D). This interval could be correlated with the Holocene pluvial period recognized in the Adriatic Sea (WUNSAM et al, 1999;SCHMIDT et al, 2001) and in the lacustrine sediments from karst poljes and lakes located along the eastern Adriatic coast (SCHMIDT et al, 2000;BALBO et al, 2006;ILIJANIĆ et al, 2018).…”

Section: Palaeo-marine Ponds and The Palaeoenvironmental Evolution Ofmentioning

confidence: 89%

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

et al. 2019

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Section: Palaeo-marine Ponds and The Palaeoenvironmental Evolution Ofmentioning

confidence: 89%

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

et al. 2019

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“…Additionally, a decrease in temperature was not commonly featured across the whole region. Speleothem records from the eastern Adriatic insular caves Strašna peć (Dugi otok Island) (Lončar et al, 2019) and Mala špilja (Mljet Island) (Lončar et al, 2017) both point to dry environmental conditions around 4.2 ka (Figure 6), as well as some other regional proxies from the cores from Busuja Bay in Istria (Kaniewski et al, 2018), Lake Vrana (Cres Island) (Schmidt et al, 2000) and Bokanjačko blato in North Dalmatia (Ilijanić et al, 2018). Although the climate type of the NG region does not fully correspond to the Mediterranean climate of Bini et al (2019) (based roughly on the reach of the olive tree), the NG speleothem clearly recorded this sudden anomaly.…”

Section: Discussionmentioning

confidence: 99%

“…Constantin et al, 2007; Hercman et al, 2020; Onac et al, 2002; Siklósy et al, 2009; Tămaş et al, 2005), and from the Mediterranean area (Budsky et al, 2019; Bar-Matthews and Ayalon, 2011; Moreno et al, 2017; Psomiadis et al, 2018; Regattieri et al, 2014a, 2019; Scholz et al, 2012; Zanchetta et al, 2007), as well as on regional marine and lake core records (e.g. Bakrač et al, 2018; Ilijanić et al, 2018; Siani et al, 2013; Wunsam et al, 1999) in order to provide better insights into the broad regional changes. Contemporary monitoring of the Nova Grgosova site has revealed influences of both Mediterranean and Atlantic air masses (Surić et al, 2018), whose relative importance probably shifted during glacial-interglacial cycles, given the location of the cave in south central Europe but only 120 km from the Adriatic Sea.…”

Section: Introductionmentioning

confidence: 99%

Holocene hydroclimate changes in continental Croatia recorded in speleothem δ¹³C and δ¹⁸O from Nova Grgosova Cave

et al. 2021

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We present the first stable isotope (δ13C and δ18O) speleothem record from continental Croatia retrieved from two coeval stalagmites from Nova Grgosova Cave. U-Th dates constrain the stalagmite growth history from 10 ka to the present, revealing coeval growth between 7.8 and 5.6 ka. We interpret δ18O as an autumn/winter hydrological proxy related to changes of vapor source, precipitation amount, and/or seasonal rainfall distribution, while δ13C predominantly responds to spring/summer vegetation status and soil microbial activity. We identify several centennial to millennial-scale hydroclimate oscillations during this period that result from multiple forcing factors. Along with amount and source effect, it appears that some centennial variations were governed also by seasonal moisture balance. From 9.2 to 8.8 ka BP, the local environmental setting was characterized by enhanced vegetation activity, while during the 8.2 ka event the main feature was a change in precipitation seasonality. The most prominent change, identified in both δ13C records, is a sudden decline of vegetation and soil biological activity around 7.4 ka, indicating a precipitation decrease at a time of maximum plant growth in spring and summer and likely also reduced precipitation in autumn and winter. Although small in magnitude in these speleothems, a peak in δ18O and δ13C values at 4.3–4.1 ka suggests that both summer and winter conditions were substantially drier during the 4.2 ka event, in accordance with increased Mediterranean aridity and consistent with other global climate changes reported at this time. Compared to the present North Atlantic Oscillation (NAO) influence, we assume that millennial Holocene NAO-like variations were persistent through the Holocene via their effect on modifying local/regional air temperature, vapor origin, and inter- and intrannual precipitation distribution. Anthropogenic deforestation, which was the first major human impact on the environment during the Neolithic agricultural revolution, is excluded as a leading factor in δ13C variability since the first sedentary settlements were established further to the east in more arable locations along river valleys. However, the impact of intensive mining around the cave site during the last millennium is evident, with substantial deforestation driving an increase in δ13C.

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“…This is evidenced on the eastern Adriatic coast by submerged freshwater lakes and wetlands in Lake Veliko and Stupa Bay on the Island of Mljet [16,18], in Pirovac Bay [19], as well as a sub-marine archaeological Roman site and salt marsh in the Caska Bay on the Island of Pag [20,21], and prehistoric pile-dwellings in Zambratija Bay [22]. Most of the freshwater lakes on the eastern Adriatic coastal area formed during the Late Pleistocene/Early Holocene, such as Lake Vrana [23][24][25], a lake in Bokanjačko Blato [26], the Baćina Lakes (Crniševo) [19], and Lake Veliko on the Island of Mljet [16][17][18]27]. Holocene palaeohydrological changes from shallow to deeper lakes are driven by the sea level rise, while climate variability was only partly recorded, also due to the low resolution.…”

Section: Introductionmentioning

confidence: 99%

A Holocene Sedimentary Record and the Impact of Sea-Level Rise in the Karst Lake Velo Blato and the Wetlands on Pag Island (Croatia)

Ilijanić

Miko

Filipović

et al. 2022

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Lakes in coastal lowland areas represent a critically vulnerable environment as a transitional space between freshwater and seawater environments. The paleoenvironmental reconstruction and anthropogenic impact are assessed through the lake sediment cores from Velo, Malo, and Kolanjsko Blato using multi-proxy analyses (sedimentological, mineralogical, geochemical, 137Cs and ostracod analyses, and AMS 14C radiocarbon dating). The freshwater lake Velo Blato was formed at 8100 cal yr BP due to rising groundwater levels as a consequence of sea-level rise. The brackish conditions in Lake Velo Blato started at 7100 cal yr BP, giving the index point for the sea-level curve of 7-m lower than present. Lead concentrations showed slightly increased values in the last 1800 cal yr BP, while the spike in Malo Blato lake sediments probably derived from bird hunting with lead bullets. Kolanjsko Blato sediment core archives the sediment record of the last 2050 years, which represents a shallow brackish coastal wetland under marine influence. Enrichment factors showed the accumulation of Cu, Hg, P, Pb, S, and Zn in the sediments from Kolanjsko Blato in the last 650 cal yr BP, which coincides with the high organic carbon content, and in sediments from Malo Blato after the lake’s formation (from the depth of 20 cm upwards). Anthropogenic Cu introduced into the Kolanjsko Blato sediments is the highest in the surface sample. Surficial sediments from Velo Blato are characterized by the high organic carbon, S, P, and N content, indicating high productivity and eutrophication which led to occasional anoxic conditions on the lake bottom in the last 200 years.

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Holocene environmental record from lake sediments in the Bokanjačko blato karst polje (Dalmatia, Croatia)

Cited by 15 publications

References 49 publications

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

Holocene hydroclimate changes in continental Croatia recorded in speleothem δ¹³C and δ¹⁸O from Nova Grgosova Cave

A Holocene Sedimentary Record and the Impact of Sea-Level Rise in the Karst Lake Velo Blato and the Wetlands on Pag Island (Croatia)

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Holocene environmental record from lake sediments in the Bokanjačko blato karst polje (Dalmatia, Croatia)

Cited by 15 publications

References 49 publications

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

Holocene foraminiferal and geochemical records in the coastal karst dolines of Cres Island, Croatia

Holocene hydroclimate changes in continental Croatia recorded in speleothem δ13C and δ18O from Nova Grgosova Cave

A Holocene Sedimentary Record and the Impact of Sea-Level Rise in the Karst Lake Velo Blato and the Wetlands on Pag Island (Croatia)

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Holocene hydroclimate changes in continental Croatia recorded in speleothem δ¹³C and δ¹⁸O from Nova Grgosova Cave