Ecological effects of multiple stressors on a deep lake (Lago Maggiore, Italy) integrating neo and palaeolimnological approaches

Guilizzoni, Piero; Levine, Suzanne N.; Manca, Marina; Marchetto, Aldo; Lami, Andrea; Ambrosetti, Walter; Brauer, Achim; Gerli, Stefano; Carrara, E.; Rolla, Angelo; Guzzella, Licia; Vignati, Davide A.L.

doi:10.4081/jlimnol.2012.e1

Cited by 42 publications

(31 citation statements)

References 89 publications

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“…, 2009), because Si reflects both siliciclastic matter and biogenic components. Low values of Si/Al in sediment unit I reflect low biogenic silica contents, proven by diatom counts in core LM 1b, and therefore a low internal productivity, which is in good agreement with limnological data (Guilizzoni et al. , 2012).…”

Section: Resultssupporting

confidence: 84%

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Detrital layers marking flood events in recent sediments of Lago Maggiore (N. Italy) and their comparison with instrumental data

et al. 2012

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Summary 1. A succession of 20 detrital layers was detected in five short cores from the Pallanza Basin in the western part of Lago Maggiore (Italy) by combining thin‐section analyses and high‐resolution micro‐X‐ray fluorescence (μ‐XRF) scanning techniques. The detrital layers range in thickness from 0.6 to 17.4 mm and appear most distinct in the upper 20–25 cm of each core, where eutrophication since the early 1960s resulted in the deposition of a dark, organic sediment matrix. 2. The age‐depth model of previously dated cores was transferred by precise intra‐basin correlation of distinct marker layers, thus providing a reliable chronology for the 20 detrital layers covering the time period 1965–2006. 3. All detrital layers are related to regional floods as recorded by short‐term lake level rises and peaks in discharge of the River Toce, the main tributary to the Pallanza Basin. 4. Detailed intra‐basin correlation of detrital layers allows us to distinguish river run‐off events from local erosion, as well as evaluate the relation between detrital layer thickness and flood amplitude. Massive clay accumulation on top of the thickest detrital layers might have affected lake ecology by attenuating light and influencing metabolic activity. 5. In the clastic‐dominated sediments deposited before 1965, detrital layers are less clearly discernible because of the predominantly clastic pelagic sediment matrix. The combination of thin‐section and μ‐XRF techniques, however, shows the potential to establish even longer flood layer time series from Lago Maggiore sediments.

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Section: Resultssupporting

confidence: 84%

“…3). The generally darker colour of sediment unit II is attributable to increased organic material as indicated by an increase in loss on ignition and total carbon in core LM 1b (Guilizzoni et al. , 2012) as well as higher abundances of diatom frustules observed in thin sections and determined in core LM 1b by Guilizzoni et al.…”

Section: Resultsmentioning

confidence: 99%

Detrital layers marking flood events in recent sediments of Lago Maggiore (N. Italy) and their comparison with instrumental data

et al. 2012

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“…Birks & Birks, ; Davidson et al ., ; Michelutti & Smol, ). However, with few notable exceptions (Birks & Birks, ; Sayer et al ., ; Guilizzoni et al ., ), rarely have such studies been conducted on as large a number of biological groups as here, most involving a mix of physical and chemical proxies with just one or two biological groups included to infer broader environmental change. Of course, handling data from several fossil groups and multiple cores is not straightforward, but the approach taken here, where plant and animal macrofossil data are amalgamated from three cores, has proved successful in revealing a strong sequence of events and coherent patterns which are consistent with botanical records from the site (Davidson et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…Numerous palaeoecological studies have examined one or more of these fossil groups to assess ecological response to eutrophication (e.g. Leavitt et al ., ; Miskimmin, Leavitt & Schindler, ; Brooks, Bennion & Birks, ; Taylor et al ., ; Sayer et al ., ; Guilizzoni et al ., ; Hobbs et al ., ). However, the potential of the fuller sediment record for assessing food‐web alterations and interactions between the various components of shallow lake ecosystems, over long timescales, is yet to be fully explored.…”

Section: Introductionmentioning

confidence: 97%

Harnessing the potential of the multi‐indicator palaeoecological approach: an assessment of the nature and causes of ecological change in a eutrophic shallow lake

et al. 2015

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SUMMARY1. Multi-indicator palaeoecological studies have become increasingly popular over the last decade as the need for a more complete understanding of lake ecological histories has increased. However, the true potential of the full biological record for assessing the potential drivers of observed ecological shifts in lake sediment records has rarely been demonstrated. 2. Here, we examine the remains of a range of food-web components including algae (diatoms), macrophytes (plant macrofossils), zooplankton (chitinous and ephippial Cladocera remains), invertebrates (including chironomids, bryozoans, Mollusca) and fish (fish scales and fish leech egg cocoons) in multiple sediment cores from Groby Pool, an enriched English shallow lake, to assess whole-ecosystem response to eutrophication over the last two centuries. We focus on three striking changes in the palaeorecord, namely the post-1900 increase in Daphnia spp., the post-1840 decline in Cristatella mucedo and the post-1940 increase in Cocconeis placentula, and utilise the multi-indicator palaeoecological data to evaluate possible explanations for these patterns. 3. Principal curves analysis revealed marked and broadly simultaneous changes in the plant macrofossils, cladocerans, diatoms and chironomids (as well as in other animal remains such as bryozoans and Mollusca), indicating an early period of enrichment most likely associated with land-use change in the late 18th century, followed by a more recent eutrophication phase coincident with the discharge of sewage effluent to the lake from 1935. 4. Ecological change, resulting from eutrophication, was shown to have progressed slowly and steadily and to have occurred at all trophic levels with a shift from a relatively diverse 'mesotrophic' macrophyte assemblage, dominance by benthic diatoms and plant-associated Chydoridae and chironomids towards a relatively species-poor, 'eutrophic' macrophyte community with dominance by planktonic algae (e.g. Cyclostephanoid diatom taxa), planktonic Cladocera (Bosmina, Daphnia) and a chironomid fauna dominated by mud-associated taxa. The inferred shift in the macrophyte community from charophyte to fine-leaved pondweed and Callitriche truncata suggests a reduction in the seasonal duration of plant dominance. 5. The multi-indicator analysis indicates that a combination of increased phytoplankton biomass and low zooplanktivorous fish predation is likely to explain the recent increases in Daphnia spp., while loss of plant habitat and increased competition for food appear to be the most likely causes of the observed decline in C. mucedo, and resistance to increased grazing pressure from invertebrates is the most probable driver of the C. placentula increase. 1423This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.Freshwater Biology (2015Biology ( ) 60, 1423Biology ( -1442Biology ( doi:10.1111 6. Our study illustrates the potenti...

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“…One of the biggest problems in these areas which are affected by climate change is the quality and quantity of water resources supplied to the growing population (Pouliotte et al ., ). Numerous studies have demonstrated that climate changes have significant effects on water temperature (Dokulil et al ., ; Schneider, 2009; Hetherington et al ., ) and lake ecosystems (Verburg and Hecky, ; Guilizzoni et al ., ). Lake and reservoir water temperature is sensitive to meteorological variables.…”

Section: Introductionmentioning

confidence: 97%

Impact of Climate Change on Basin Hydrological Characteristics and Thermal Structure of Reservoirs

Dalilsafaee

Niksokhan

Moshtaghi

2017

Irrigation and Drainage

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In this study, a hydrodynamic model of water quality (CE‐QUAL‐W2) coupled with a hydrological model (SWAT) with emission scenarios predicted by general circulation models in the future were applied to examine the impact of climate change on the thermal structure of a reservoir. According to the results, the mean annual air temperature will increase from 1.47 to 1.80°C (B1) and from 2.00 to 2.11°C (A2). The average of the monthly precipitation total will also increase from 2.95 to 3.17 mm (A2) and from 5.32 to 9.67 mm (B1) in the future. The results of the hydrological model indicate river flow reduction (A2 scenario), no variation (ECHAM5‐OM B1) and increase (HadCM3 B1) in the future. Also, the occurrence time of maximum and minimum monthly discharges are projected to change. To determine the importance of upstream watershed hydrology on thermal structure modelling, the simulation was carried out twice, once with and then without the SWAT model. By comparing the results, it was concluded that by applying the coupled model, the climate change impact on upstream hydrology characteristics and temperature effect both in the surface and bottom layers, altered duration of the stratification cycle and its onset and termination, could be simulated successfully. Copyright © 2017 John Wiley & Sons, Ltd.

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Ecological effects of multiple stressors on a deep lake (Lago Maggiore, Italy) integrating neo and palaeolimnological approaches

Abstract: To

Cited by 42 publications

References 89 publications

Detrital layers marking flood events in recent sediments of Lago Maggiore (N. Italy) and their comparison with instrumental data

Detrital layers marking flood events in recent sediments of Lago Maggiore (N. Italy) and their comparison with instrumental data

Harnessing the potential of the multi‐indicator palaeoecological approach: an assessment of the nature and causes of ecological change in a eutrophic shallow lake

Impact of Climate Change on Basin Hydrological Characteristics and Thermal Structure of Reservoirs

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