Lago di Bargone, Liguria, N Italy: a reconstruction of Holocene environmental and land-use history

Cruise, G.M.; Macphail, Richard I.; Linderholm, Johan; Maggi, Roberto; Marshall, P.

doi:10.1177/0959683609343142

Cited by 32 publications

(30 citation statements)

References 72 publications

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“…Lago di Bargone is situated at 9 km from the Ligurian coast at 831 m a.s.l. (Cruise et al, 2009). Mean annual precipitation is around 1800 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The so-called "4.2 ka event" has so far been observed in several pollen records from the central Mediterranean, where it has been described as a phase of temporary decline in arboreal pollen (AP) percentages, interpreted as an opening of the forest vegetation Magri, 2009, 2012;Di Rita et al, 2018b). This paleovegetational event is more or less coeval to the drought event that has been recognized in the eastern Mediterranean regions (Kaniewski et al, 2018), in the Middle East (e.g., Weiss, 2017;Weiss et al, 1993;Cullen et al, 2000;Staubwasser et al, 2003), Africa (e.g., Marshall et. al., 2011), and South and East Asia (Liu and Feng, 2012;Dixit et al, 2014Dixit et al, , 2018 and to widespread climate anomalies recorded at a global scale (e.g., Walker et al, 2012), including wetter climate conditions in the southwestern Mediterranean regions (Di Rita et al, 2018a;Zielhofer et al, 2018).…”

Section: Introductionmentioning

confidence: 95%

“…Lago Riane: Branch (2013); 3. Lago di Bargone: Cruise et al (2009); 4. Lago Padule: Watson (1996); 5.…”

Section: Introductionunclassified

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The 4.2 ka event in the vegetation record of the central Mediterranean

Rita

Magri

2019

Clim. Past

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Abstract. In this paper, the variation in forest cover in the central Mediterranean region, reflected by percentage changes in the arboreal pollen record, has been examined in relation to the 4.2 ka event. A total of 36 well-dated and detailed pollen records from latitudes between 45 and 36∘ N were selected and their vegetation dynamics between 5 and 3 ka examined in relation to the physiographic and climatic features of the study area and to the influence of human activity on past vegetation, as suggested by anthropogenic pollen indicators. We have found that the sites located between 43 and 45∘ N do not show any significant vegetation change in correspondence with the 4.2 ka event. Several sites located on the Italian Peninsula between 39 and 43∘ N show a marked opening of the forest, suggesting a vegetation response to the climate instability of the 4.2 ka event. Between 36 and 39∘ N, a forest decline is always visible around 4.2 ka, and in some cases it is dramatic. This indicates that this region was severely affected by a climate change towards arid conditions that lasted a few hundred years and was followed by a recovery of forest vegetation in the Middle Bronze Age. Human activity, especially intense in southern Italy, may have been favored by this natural opening of vegetation. In Sardinia and Corsica, no clear change in vegetation is observed at the same time. We suggest that during the 4.2 ka event southern Italy and Tunisia were under the prevalent influence of a north African climate system characterized by a persistent high-pressure cell.

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“…Lago di Bargone is situated at 9 km from the Ligurian coast at 831 m a.s.l. (Cruise et al, 2009). Mean annual precipitation is around 1800 mm.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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The 4.2 ka event in the vegetation record of the central Mediterranean

Rita

Magri

2019

Clim. Past

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“…Numerous publications are presenting several thousand yearslong continuous erosion records from low altitude alpine lakes with small-scale (<100 km 2 ) catchment areas (Bajard et al, 2015;Cruise et al, 2009;Czymzik et al, 2013;Dearing et al, 2001;Doyen et al, 2013;Foster et al, 2003;Joannin et al, 2014;Jones et al, 2013;Lauterbach et al, 2012;Manalt et al, 2001;No€ el et al, 2001;Simonneau et al, 2013b;Swierczynski et al, 2013). In those cases, the terrigenous flux or at least the more commonly and more accurately-measured relative terrigenous contribution to the sediment can be obtained.…”

Section: Low Elevation Lakes: Continuous Erosion Recordsmentioning

confidence: 99%

Erosion under climate and human pressures: An alpine lake sediment perspective

Arnaud

Poulenard

Giguet-Covex

et al. 2016

Quaternary Science Reviews

123

115

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International audienceWe review the scientific efforts over the last decades to reconstruct erosion from continuous alpine lake sediment records. We focused both on methodological issues, showing the growing importance of non-destructive high resolution approaches (XRF core-scanner) as well as progresses in the understanding of processes leading to the creation of an “erosion signal” in lakes. We distinguish “continuous records” from “event-records”. Both provide complementary information but need to be studied with different approaches. Continuous regionally-relevant records proved to be particularly pertinent to document regional erosion patterns throughout the Holocene, in particular applying the source to sink approach. Event-based approaches demonstrated and took advantage of the strong non-linearity of sediment transport in high altitude catchment areas. This led to flood frequency and intensity reconstructions, highlighting the influence of climate change upon flood dynamics in the mountain.The combination of different record types, both in terms of location (high vs. low elevation), sedimentology (high vs. low terrigenous contribution) and significance (local vs. regional) is one of the main outputs of this paper. It allows the establishment of comprehensive histories of NW French Alps erosion, but also and consequently, soil dynamics and hydrological patterns throughout the Holocene. We also discuss the influence of glacier dynamics, one of the major agents of erosion in the Alps.A major feature is the growing human influence upon erosion at a local scale since at least the middle of the Bronze Age (3500 cal. BP). However and according to the regional record from Lake Bourget, only few periods of rising erosion at local scales generated a regional record that can be discriminated from wetter climatic periods. Among them, the period between 200 BCE and 400 AD appeared to be marked by a generalised rise in human-triggered erosion at local scales in the northern French Alps.This review highlights the importance of modern high-resolution and interdisciplinary studies of lake sediments, in order to better understand the complex relationships between humans, climate and the Earth system in general. We strongly argue that regional integration of data is now required to move a step further. Such an integration is easier with cost- and time-effective methods as well as after a better definition of approaches and their limits. This should lead to a stronger collaboration between paleo-data producers and modellers in the near future

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“…(3) Lago di Bargone is situated at 9 km from the Ligurian coast at 831 m a.s.l. (Cruise et al, 2009). Mean annual precipitation is around 1800 mm.…”

Section: Resultsmentioning

confidence: 99%

The 4.2 ka BP event in the vegetation record of the central Mediterranean

Rita¹,

Magri²

2018

Preprint

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Abstract. In this paper, the variation in forest cover in the central Mediterranean region, reflected by percentage changes of the arboreal pollen record, has been examined in relation to the 4.2 ka BP event. A number of 36 well-dated and detailed pollen records from latitudes between 45° and 36° N were selected and their vegetation dynamics between 5 and 3 ka examined in relation to the physiographic and climatic features of the study area and to the influence of human activity on past vegetation, as suggested by anthropogenic pollen indicators. We have found that the sites located between 43° and 45° N do not show any significant vegetation change in correspondence with the 4.2 ka event. Several sites located in the Italian Peninsula between 39°–43° N show a marked opening of the forest, suggesting that a lowering of rainfall occurred during the 4.2 ka BP event, sufficiently strong to determine a forest decline. Between 36°–39° N, a forest decline is always visible around 4.2 ka BP, and in some cases it is dramatic. This indicates that this region was severely affected by a climate change towards arid conditions that lasted a few hundreds of years and was followed by a recovery of forest vegetation in the middle Bronze age. Human activity, especially intense in southern Italy, may have been favored by this natural opening of vegetation. In Sardinia and Corsica, no clear change in vegetation is observed at the same time. We suggest that during the 4.2 ka BP event southern Italy and Tunisia were under the prevalent influence of a north African climate system, characterized by a persistent high-pressure cell.

show abstract

Lago di Bargone, Liguria, N Italy: a reconstruction of Holocene environmental and land-use history

Cited by 32 publications

References 72 publications

The 4.2 ka event in the vegetation record of the central Mediterranean

The 4.2 ka event in the vegetation record of the central Mediterranean

Erosion under climate and human pressures: An alpine lake sediment perspective

The 4.2 ka BP event in the vegetation record of the central Mediterranean

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