Why we need more paleolimnology studies in the tropics

Escobar, Jaime; Serna, Yuliana; Hoyos, Natalia; Vélez, María Isabel Álvarez; Correa‐Metrio, Alex

doi:10.1007/s10933-020-00120-6

Cited by 17 publications

(8 citation statements)

References 49 publications

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“…In more recent studies, the focus shifted towards the multidisciplinary effects of climate change on lake ecosystems (Deng et al, 2017) using a combination of bio-geochemical proxies. However, in a recent study, Escobar et al (2020) show that the tropics are strongly under-represented in climate-related paleolimnological studies. Even though approx.…”

Section: Introductionmentioning

confidence: 94%

Paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam: a review on the state of research

Nguyễn-Văn

Unkel

Nguyễn-Thùy

et al. 2023

Vietnam J. Earth Sci.

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Global warming enhances atmospheric moisture loading and will likely affect monsoon strength in Vietnam. Without a long written history in Vietnam, we need to rely on geoarchives such as lake sediments to reconstruct past monsoon variability and regional paleoenvironmental fluctuations and evaluate current climatic trends. Natural lakes in the Central Highlands of Vietnam have the potential to have recorded shifts of the monsoon belt over glacial/interglacial cycles. Since 2016, the EOS Geoscience Research Group at Vietnam National University, Hanoi (EOS group) has collaborated with international partners to collect and analyze Vietnamese lake sediments to reconstruct the Pleistocene-Holocene climate history. Numerous sediment cores have been retrieved from Biển Hồ, Ia Bang, Ea Tyn, Ea Sno and Lak lakes between 2016 and 2022. Of special importance is a 25 m long sediment core from Biển Hồ Lake (Gia Lai province) covering the last 57 ka, which the team retrieved in April 2021. Sediment cores were analyzed for geochemistry, sedimentology, magnetic susceptibility, and radiocarbon dating. This paper reviews the status of our currently available sedimentary records to assess the paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam. Current data suggest that the lakes in the Central Highlands provide reliable sedimentological and geochemical records and bear the potential to reconstruct the paleoenvironmental and paleoclimatic conditions in Vietnam across several glacial periods, with a high-resolution record at least in the Holocene. The records contribute to quantifying the effects of monsoon variability and assessing the changes in hydrological conditions before and after the onset of human land use by comparing different lakes in the region. Future fieldwork will focus on retrieving longer lake sediment sequences from the Central Highlands, possibly covering the full interglacial-glacial cycle (i.e. the last 125 ka, back to MIS-5e), and on the assessment of comparable lake archives in other parts of Vietnam where the timing and character of monsoon-related climatic variations may have differed.

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Section: Introductionmentioning

confidence: 94%

Paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam: a review on the state of research

Nguyễn-Văn

Unkel

Nguyễn-Thùy

et al. 2023

Vietnam J. Earth Sci.

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“…Palaeolimnological studies have disproportionally focused on temperate rather than tropical lakes based on global lake abundance estimates (Escobar et al., 2020; Verpoorter et al., 2014). Many previous studies have documented the history of zooplankton assemblages in temperate lakes, providing important insights into the environmental drivers of changes in these ecosystems over decadal‐to‐centennial scales (Allen et al., 2011; Cáceres et al., 2005; Otake et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Temporal dynamics of invertebrate community assembly in Lake Victoria since the late Pleistocene based on chitinous remains

King,

Courtney‐Mustaphi,

Cuenca‐Cambronero

et al. 2024

Freshwater Biology

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Preserved assemblages of invertebrate remains in lacustrine sediment reveal temporal variations of community composition and environmental conditions. However, records for large tropical lakes are scarce. Lake Victoria, the largest tropical lake, has a dynamic history of changes in water level, biogeochemistry and fish community composition over the past ~17,000 cal yr BP. In order to quantify changes in the invertebrate assemblage of Lake Victoria from the late Pleistocene throughout the Holocene, we examined chitinous remains of Cladocera and larval dipterans (Chironomidae and Chaoboridae) from a sediment core (37 m water depth) dated from ~13,700 cal yr BP to present. We identified four major phases in the invertebrate assemblage throughout this period of lake history. Firstly, Chironomidae and Chaoboridae appeared at low abundances during the earliest stages of lake inundation in the late Pleistocene, at a time when Cladocera were notably absent. Secondly, chaoborids and chironomids increased in abundance during the mid‐Holocene, which coincided with high diatom production toward the end of the Holocene African Humid Period. Thirdly, starting ~4,700 cal yr BP, Alona, a predominantly littoral cladoceran genus, consistently appeared in the invertebrate assemblage alongside changes in mixing regimes and persisted throughout the late Holocene to the present. Fourthly, the arrival of both Chydorus and Bosmina longirostris marked the establishment of an abundant cladoceran assemblage at ~1,350 cal yr BP. The assemblage then gradually shifted toward the increasing dominance of B. longirostris, a planktonic cladoceran. Several of the observed changes in the invertebrate assemblage occurred concurrently with changes in climatic conditions in East Africa and diatom productivity that have been previously recorded in Lake Victoria. This multi‐millennial record of sedimentary invertebrate assemblages in Lake Victoria elucidates some of the temporal development of these communities throughout most of the dynamic modern history of the ecosystem.

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“…Most limnological studies are carried out in temperate lakes, whereas the special characteristics of lacustrine sediment in tropical lakes are still largely unknown (Escobar et al 2020). The most important difference between temperate and tropical lakes are the small seasonal temperature fluctuations in the latter, leading to an often more stable temperature gradient in the water column that is not disturbed by changing surface water temperatures.…”

Section: Introductionmentioning

confidence: 99%

Surface sediment composition and depositional environments in tropical Lake Sentani, Papua Province, Indonesia

Nomosatryo

Tjallingii

Henny³

et al. 2022

J Paleolimnol

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Tropical Lake Sentani in the Indonesian Province Papua consists of four separate basins and is surrounded by a catchment with a very diverse geology. We characterized the surface sediment (upper 5 cm) of the lake’s four sub-basins based on multivariate statistical analyses (principal component analysis, hierarchical clustering) of major element compositions obtained by X-ray fluorescence scanning. Three types of sediment are identified based on distinct compositional differences between rivers, shallow/proximal and deep/distal lake sediments. The different sediment types are mainly characterized by the correlation of elements associated with redox processes (S, Mn, Fe), carbonates (Ca), and detrital input (Ti, Al, Si, K) derived by river discharge. The relatively coarse-grained river sediments mainly derive form the mafic catchment geology and contribution of the limestone catchment geology is only limited. Correlation of redox sensitive and detrital elements are used to reveal oxidation conditions, and indicate oxic conditions in river samples and reducing conditions for lake sediments. Organic carbon (TOC) generally correlates with redox sensitive elements, although a correlation between TOC and individual elements change strongly between the three sediment types. Pyrite is the quantitatively dominant reduced sulfur mineral, monosulfides only reach appreciable concentrations in samples from rivers draining mafic and ultramafic catchments. Our study shows large spatial heterogeneity within the lake’s sub-basins that is mainly caused by catchment geology and topography, river runoff as well as the bathymetry and the depth of the oxycline. We show that knowledge about lateral heterogeneity is crucial for understanding the geochemical and sedimentological variations recorded by these sediments. The highly variable conditions make Lake Sentani a natural laboratory, with its different sub-basins representing different depositional environments under identical tropical climate conditions.

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Why we need more paleolimnology studies in the tropics

Cited by 17 publications

References 49 publications

Paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam: a review on the state of research

Paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam: a review on the state of research

Temporal dynamics of invertebrate community assembly in Lake Victoria since the late Pleistocene based on chitinous remains

Surface sediment composition and depositional environments in tropical Lake Sentani, Papua Province, Indonesia

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