Sedimentary multiproxy response to hydroclimatic variability in Lagunillo del Tejo (Spain)

Romero-Viana, Lidia; Miracle, María Rosa; López‐Blanco, Charo; Cuna, Estela; Vilaclara, Gloria; García-Orellana, Jordi; Keely, Brendan J.; Camacho, Antonio; Vicente, Eduardo

doi:10.1007/978-90-481-3387-1_14

Cited by 6 publications

(13 citation statements)

References 45 publications

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“…The sediment records from Lagunillo del Tejo show conspicuous alternating dark and light bands (Figure 2A) corresponding to reduced ('R', high content of organic matter) and oxidized ('O', low content of organic matter) zones, respectively, as described earlier by Romero-Viana et al (2009). We propose a correlation between the CN-3b and CN-4 sediment cores based on the assumption that these 'R' and 'O' zones, and the changes in LOI, are synchronous.…”

Section: Lithology and Chronological Modelsupporting

confidence: 74%

“…Around ad 1900, macrofossil remains were very few, which was also the case of pigment markers, diatoms and cladocera in a previous study (Romero-Viana et al, 2009); the latter was ascribed to high erosion during the construction of the The Holocene 22 (5) agricultural terraces in the lake basin at the beginning of the twentieth century. The dominance of macroremains from marsh, upland and tree taxa also indicates the lowest lake level of the entire record.…”

Section: Lake-level Fluctuations and Climate Changesupporting

confidence: 61%

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Lake-level changes and fire history at Lagunillo del Tejo (Spain) during the last millennium: Climate or humans?

et al. 2011

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Hydroclimatic variability is expected to be affected by global warming in the Mediterranean region where climate, fire and human activities are known to be interdependent. The latter is examined here for the past millennium by studying paleoenvironmental indicators from a sedimentary sequence at Lagunillo del Tejo (Cuenca, central Spain). Inferred changes in fire activity and lake levels are based on records of macrocharcoals and plant/algal macrofossils, respectively, and are compared with independent information on climate change and socio-economical transformations from historical and meteorological records. The results show that there is an obvious climatic forcing behind the lake-level changes recorded at Lagunillo del Tejo, and a good correlation between the periods of high fire activity/frequent fires and low lake level/drought conditions. The reconstructed fire regime may therefore be natural (climate-induced), but can also be explained by important socio-economical events/changes, including wars and the introduction of the Transhumance practices (ad 1273). There is a good chronological agreement between lowest fire activity and high lake levels ( c. ad 1600–1800), concurrent with the late ‘Little Ice Age’ (LIA) and the collapse of the Transhumance system. We propose that periods of drought favored both natural and human-induced fires during the ‘Medieval Climatic Anomaly’ (around ad 1200), at the start of the LIA (around ad 1400), in the middle of the LIA (sixteenth century) and during the entire nineteenth century. This record is an example of long-term interplay between climate changes and human activities and its impact on environmental changes such as fire regimes.

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Section: Lithology and Chronological Modelsupporting

confidence: 74%

Section: Lake-level Fluctuations and Climate Changesupporting

confidence: 61%

Lake-level changes and fire history at Lagunillo del Tejo (Spain) during the last millennium: Climate or humans?

et al. 2011

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“…The sediment accumulation rate (r, g cm -2 year -1 ) was obtained from the slope (b) of the regression line as r = -k/b, where k is the 210 Pb radioactive decay constant. The 210 Pb dating was also confirmed by the 137 Cs profiles (Pfitzner et al, 2004;Bellucci et al, 2007;Romero-Viana et al, 2009).…”

Section: Core Collection and Analysissupporting

confidence: 60%

Spicule records of Ephydatia fluviatilis as a proxy for hydrological and environmental changes in the shallow Lake Trasimeno (Umbria, Italy)

et al. 2011

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This research shows the results of an analysis of siliceous spicules found in sediment cores collected in Lake Trasimeno (Umbria, Italy), a shallow lake that experienced an important water level lowering during the last century. A morphological analysis of sedimentary sponge records revealed that the spicules accumulated in the lake sediments over the last 150 years are attributable to Ephydatia fluviatilis, the only sponge species found in the lake in recent years. The stratigraphic analysis of the cores showed that the abundance and size of the sponge spicules (megascleres) have remarkably decreased, suggesting that a significant depletion of the sponge fauna occurred, particularly during the first half of the twentieth century. A correlation analysis has identified morpho-hydrological and related variables (the theoretical fraction of lake surface subjected to resuspension and the amount of total suspended solids) as the most significant factors explaining the change in density of sponge spicules. Two ecological explanations of the sponge decline are proposed, based on the sensitivity of the sponge both to the availability of suitable hard substrata for colonization, and to the amount of wind-resuspended solids. One-ended sigmoid response curves were obtained by regression and corresponding transfer functions were derived, which allow the mean water depth of the lake and total suspended solids to be inferred from spicule density records. The results support the use of sponge spicules as a paleohydrological and paleoecological proxy, application of which appears particularly promising for shallow-water systems.

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“…Thus, chydorid assemblages are represented by the phytophilous G. testudinaria in the holomictic basin and by A. angustatus in the meromictic part. Both species are commonly found together in the same lake (e.g., in Lagunillo del Tejo or in Lake La Cruz (Mezquita & Miracle, 1997;Romero-Viana et al, 2009), but they probably select distinct locations within the lakes.…”

Section: Discussionmentioning

confidence: 98%

“…Shifts in natural conditions (Hofmann, 1998;Lotter et al, 2000Lotter et al, , 2008, anthropogenic alterations (Johasson et al, 2005), or both (Mezquita & Miracle, 1997) can be detected by means of cladoceran assemblages. Among the human impacts, hydrological changes and the response of cladoceran community to them are catching more attention recently (SarmajaKorjonen & Alhonen, 1999;Korhola et al, 2000;Sarmaja-Korjonen, 2001;Sarmaja-Korjonen et al, 2003;Romero-Viana et al, 2009). These hydrological modifications usually involve changes in the water volume and/or changes in water chemistry (ions, nutrients, and organic compounds concentrations) provoked by transfer of water with different characteristics.…”

Section: Introductionmentioning

confidence: 98%

Cladoceran assemblages in a karstic lake as indicators of hydrological alterations

2011

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The anthropogenic impact on wetlands has increased during the last centuries when infrastructures such as canals or dams, have proliferated. In this article, we have used cladoceran sub-fossils to investigate the effects of a canal on lake El Tobar (Spain). The canal has been transferring water from a reservoir, built in another valley, into this lake since its construction in the mid1960s. Cladoceran remains were analyzed in two sediment profiles from each of the two sub-basins of the lake. The sedimentary sequences showed that the mentioned human activity provoked a clear shift in the cladoceran community. A PCA was performed with samples from both sub-basins to detect the direction and nature of the changes. Before water transference, the phytophilous chydorid community, represented by Acroperus angustatus in one sub-basin and by both A. angustatus and Graptoleberis testudinaria in the other sub-basin, were well developed. After the construction of the canal and the inflow of additional yet different water from the reservoir, the proportion of chydorids relative to total cladoceran diminished considerably; this was mainly due to the invasion of Bosmina longirostris. These results indicate that the hydrological alteration caused a shift from an oligotrophic, shallower lake with a rich plant-associated cladoceran community to a more eutrophic lake with a predominant planktonic cladoceran community; and that cladoceran remains are a powerful tool to detect hydrological changes and eutrophication.

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Sedimentary multiproxy response to hydroclimatic variability in Lagunillo del Tejo (Spain)

Cited by 6 publications

References 45 publications

Lake-level changes and fire history at Lagunillo del Tejo (Spain) during the last millennium: Climate or humans?

Lake-level changes and fire history at Lagunillo del Tejo (Spain) during the last millennium: Climate or humans?

Spicule records of Ephydatia fluviatilis as a proxy for hydrological and environmental changes in the shallow Lake Trasimeno (Umbria, Italy)

Cladoceran assemblages in a karstic lake as indicators of hydrological alterations

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