Diatom response to climatic and tectonic forcing of a palaeolake at the southeastern margin of the Tibetan Plateau during the late Pleistocene, between 140 and 35ka BP

Li, Yanling; Rioual, Patrick; Shen, Ji; Xiao, Xiayun

doi:10.1016/j.palaeo.2015.06.039

Cited by 7 publications

(5 citation statements)

References 69 publications

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“…ka BP (Bezrukova et al 2010). The tychoplanktonic Staurosirella pinnata can be abundant in relatively warm, shallow, eutrophic lakes with high pH (Bennion 1994), although it is more widely known for developing large populations in arctic and alpine lakes under cold and oligotrophic conditions (Lotter et al 2010;Li et al 2015). It is considered an opportunist taxon that takes advantage of repeated disturbances (Lotter & Bigler 2000) in line with the interpretation in Bezrukova et al (2010) and with the records of lake-level fluctuations presented in the current study.…”

Section: Discussionsupporting

confidence: 82%

“…The coarseresolution diatom record available shows a dominance of small valves of the Staurosirella pinnata agg. The tychoplanktonic Staurosirella pinnata can be abundant in relatively warm, shallow, eutrophic lakes with high pH (Bennion 1994), although it is more widely known for developing large populations in arctic and alpine lakes under cold and oligotrophic conditions (Lotter et al 2010;Li et al 2015). ka BP (Bezrukova et al 2010).…”

Section: Site/proxy Interpretationmentioning

confidence: 99%

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Insight into the Last Glacial Maximum climate and environments of the Baikal region

Tarasov

Ilyashuk

Leipe

et al. 2018

Boreas

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This study presents a multi-proxy record from Lake Kotokel in the Baikal region at decadal-to-multidecadal resolution and provides a reconstruction of terrestrial and aquatic environments in the area during a 2000-year interval of globally harsh climate often referred to as the Last Glacial Maximum (LGM). The studied lake is situated near the eastern shoreline of Lake Baikal, in a climatically sensitive zone that hosts boreal taiga and cold deciduous forests, cold steppe associations typical for northern Mongolia, and mountain tundravegetation. The results provide a detailed picture of the period in focus, indicating (i) a driest phase (c. 24.0-23.4 cal. ka BP) with low precipitation, high summer evaporation, and low lake levels, (ii) a transitional interval of unstable conditions (c. 23.4-22.6 cal. ka BP), and (iii) a phase (c. 22.6-22.0 cal. ka BP) of relatively high precipitation (and moisture availability) and relatively high lake levels. One hotly debated issue in late Quaternary research is regional summer thermal conditions during the LGM. Our chironomid-based reconstruction suggests at least 3.5°C higher than present summer temperatures between c. 22.6 and 22.0 cal. ka BP, which are well in line with warmer and wetter conditions in the North Atlantic region inferred from Greenland ice-cores. Overall, it appears that environments in central Eurasia during the LGM were affected by much colder than present winter temperatures and higher than present summer temperatures, although the effects of temperature oscillations were strongly influenced by changes in humidity.

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Section: Discussionsupporting

confidence: 82%

Section: Site/proxy Interpretationmentioning

confidence: 99%

Insight into the Last Glacial Maximum climate and environments of the Baikal region

Tarasov

Ilyashuk

Leipe

et al. 2018

Boreas

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“…Fossil diatom records from Fuxian Lake show that C. rhomboideo-elliptica decreased abruptly with cultural eutrophication due to high phosphorus and nitrogen loadings (Li et al, 2012). C. rhomboideo-elliptica was also dominant in the Heqing palaeolake during the Pleistocene since MIS 6 (Li et al, 2015b). In the diatom record from Lugu Lake covering the last glacial period C. rhomboideo-elliptica was dominant between 30,000 and 24,500 cal yr BP but decreased rapidly during the last glacial maximum, reflecting its sensitive response to changes in thermal structure and nutrient concentration (Wang et al, 2014).…”

Section: Diatom Ecologymentioning

confidence: 99%

Direct versus indirect climate controls on Holocene diatom assemblages in a sub-tropical deep, alpine lake (Lugu Hu, Yunnan, SW China)

et al. 2016

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The reconstruction of Holocene environmental changes in lakes on the plateau region of southwest China provides an understanding of how these ecosystems may respond to climate change. Fossil diatom assemblages were investigated from an 11,000-year lake sediment core from a deep, alpine lake (Lugu Hu) in southwest China, an area strongly influenced by the southwest (or the Indian) summer monsoon. Changes in diatom assemblage composition, notably the abundance of the two dominant planktonic species, Cyclotella rhomboideo-elliptica and Cyclostephanos dubius, reflect the effects of climate variability on nutrient dynamics, mediated via thermal stratification (internal nutrient cycling) and catchment-vegetation processes. Statistical analyses of the climateediatom interactions highlight the strong effect of changing orbitally-induced solar radiation during the Holocene, presumably via its effect on the lake’s thermal budget. In a partial redundancy analysis, climate (solar insolation) and proxies reflecting catchment process (pollen percentages, C/N ratio) were the most important drivers of diatom ecological change, showing the strong effects of climateecatchmentevegetation interactions on lake functioning. This diatom record reflects long-term ontogeny of the lake-catchment ecosystem and suggests that climatic changes (both temperature and precipitation) impact lake ecology indirectly through shifts in thermal stratification and catchment nutrient exports.

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“…Benthic taxa characteristic of moist or temporarily dry sediments (Denys, 1991;Van Dam et al, 1994) accounted for 55% of the diatom abundance from which 19.5% consisted of epiphytic taxa, thus indicating the presence of aquatic plants associated to a shallow system with a well-developed littoral zone. Li et al (2015) inferred similar conditions based on high abundances of epiphytic taxa (i.e, Epithemia adnata, Cocconeis placentula) in south-western China. In addition, a meso eutrophic brackish system (e.g., Denys, 1991;Van Dam et al, 1994), with significant water turbulence and associated turbidity can be inferred from the occurrence of the planktonic species Aulacoseira granulata and Aulacoseira ambigua in the basal section of the core (150 -cm).…”

Section: Stagementioning

confidence: 86%

On the Relationship between Holocene Environmental Variability and the Diatom Composition in the Peña Lagoon, Se Uruguay

et al. 2018

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Uruguayan Southern lagoons exhibit high Holocene resolution paleoenvironmentalpaleoclimatic records for inferring long-term regional changes. The multiproxy analysis of three sediment cores allowed to recognize Holocene climatic variability from the paleolimnological record of Peña lagoon over the last 2,458 yr BP. Four main stages were identified throughout the record. The first (2,458-1,500 cal yr BP) was characterized as a shallow mesoeutrophic system with high abundances of aerophilic benthic species (i.e., Hantzschia amphioxys, Nitzschia brevissima, Frustulia sp., Luticola goeppertiana), epiphytic taxa (i.e Epithemia adnata, Eunotia spp., Rophalodia gibba) and planktonic taxa (i.e. Aulacoseira ambigua and A. granulata). The second stage showed a noticeable change in the diatom assemblage dominated by fresh-brackish benthic species Staurosira construens, but also fluctuations in the abundance of Aulacoseira ambigua and A. granulata, which indicates the occurrence of temperate to cold and semiarid climatic conditions, including intervals of high rainfall. The core chronology allowed us to ascribe this stage to the Little Ice Age (LIA). The third stage, post 390 cal yr BP, showed the highest proportion of freshwater planktonic species throughout the entire core, thus indicating the development of a eutrophic system under relatively warm and wet conditions, which were assigned to the Current Warm Period. After ca. 1962 AD, a sharp increase in the abundance of epiphytic species (i.e., Cocconeis placentula, Eunotia spp, Epithemia adnata and Encyonema minutum) highlights the onset of the fourth stage, which was characterized by littoral expansion and consequently, the proliferation of associated macrophytes due to anthropogenic impacts.

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Diatom response to climatic and tectonic forcing of a palaeolake at the southeastern margin of the Tibetan Plateau during the late Pleistocene, between 140 and 35ka BP

Cited by 7 publications

References 69 publications

Insight into the Last Glacial Maximum climate and environments of the Baikal region

Insight into the Last Glacial Maximum climate and environments of the Baikal region

Direct versus indirect climate controls on Holocene diatom assemblages in a sub-tropical deep, alpine lake (Lugu Hu, Yunnan, SW China)

On the Relationship between Holocene Environmental Variability and the Diatom Composition in the Peña Lagoon, Se Uruguay

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