Palaeoecological implications of the subfossil Pediastrum argentinense-type in Europe

Lenarczyk, Joanna; Kołaczek, Piotr; Jankovská, Vlasta; Turner, Falko; Karpińska‐Kołaczek, Monika; Pini, Roberta; Pędziszewska, Anna; Zimny, Marcelina; Stivriņš, Normunds; Szymczyk, Artur

doi:10.1016/j.revpalbo.2015.08.003

Cited by 11 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Colonies of the green algae Pediastrum simplex were very common in the lake. This Pediastrum species tolerates salt- and carbonate-rich waters, pointing to alkaline conditions and possibly a more or less endorheic situation of the lake under strong evaporation (Lenarczyk et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Late Pleistocene lake level, glaciation and climate change in the Mongolian Altai deduced from sedimentological and palynological archives

et al. 2020

View full text Add to dashboard Cite

Glacial and lacustrine sediments from the Mongolian Altai provide paleoclimatic information for the late Pleistocene in Mongolia, for which only a few sufficiently studied archives exist. Glacial stages referred to global cooling events are reported for the last glacial maximum (27–21 ka) and the late glacial period (18–16 ka). Sedimentary archives from the first part of the last glacial period are infrequent. We present proxy data for this period from two different archives (88–63 and 57–30 ka). Due to the limitation of effective moisture, an increase of precipitation is discussed as one trigger for glacier development in the cold-arid regions of central Asia. Our pollen analysis from periods of high paleolake levels in small catchments indicate that the vegetation was sparse and of dry desert type between 42–29 and 17–11 ka. This apparent contradiction between high lake levels and dry landscape conditions, the latter supported by intensified eolian processes, points to lower temperatures and cooler conditions causing reduced evaporation to be the main trigger for the high lake levels during glacier advances. Rising temperatures that cause melting of glacier and permafrost ice and geomorphological processes play a role in paleolake conditions. Interpreting lake-level changes as regional or global paleoclimate signals requires detailed investigation of geomorphological settings and mountain–basin relationships.

show abstract

Section: Resultsmentioning

confidence: 99%

Late Pleistocene lake level, glaciation and climate change in the Mongolian Altai deduced from sedimentological and palynological archives

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Morphological differences between P. duplex var. rugulosum and P. argentinense were previously analyzed in detail by Lenarczyk et al (2015).…”

Section: Discussionmentioning

confidence: 99%

Evolutionary relationships between the varieties of green algae Pediastrum boryanum and P. duplex s.l. (Chlorophyceae, Hydrodictyaceae)

Lenarczyk¹,

Saługa²

2018

Fottea

Self Cite

View full text Add to dashboard Cite

The infraspecific relationships of the two most variable species, Pediastrum boryanum and P. duplex s.l. identified on the basis of morphological criteria, have been poorly studied so far. The present study focused on 12 original strains isolated from Polish water bodies and 29 strains from the GenBank database, which represent P. boryanum, P. duplex s.l. varieties and other morphologically similar taxa, against the background of 14 other strains of the family Hydrodictyaceae. In order to estimate the level of congruence between the phylogeny and the classical taxonomic system based on morphological criteria, the strains of P. boryanum and P. duplex s.l., and other morphologically similar taxa were subjected to parallel phylogenetic analyses applying Bayesian and Maximum Likelihood methods to combined molecular data (26S rDNA and rbcL cpDNA) and morphological analyses based on light and scanning electron microscopy, and iconographic documentation of almost all strains published elsewhere. The gene topologies revealed many discrepancies in the morphological features used to delimit the analysed taxa. The polyphyly of both P. boryanum and P. duplex s.l. was confirmed. Pseudopediastrum boryanum var. cornutum (formerly P. boryanum var. cornutum) formed a well supported monophyletic clade, whereas other varieties, including var. boryanum, brevicorne and longicorne, proved to be complex taxa. Previous description of Lacunastrum gracillimum (formerly P. duplex var. gracillimum) was well supported. A clade composed mostly of European strains identified as P. duplex var. rugulosum should be regarded as this taxon, whereas clades containing strains exhibiting P. duplex var. rugulosum-like morphology represent new taxa. Taxonomical changes within both P. boryanum and P. duplex s.l. are required on the basis of a higher number of strains and detailed morphometric data.

show abstract

“…ka BP (Saarse et al 2009). As Pediastrum thrives in clean and shallow freshwater bodies (Komarek & Jankovska 2001;Lenarczyk et al 2015), such conditions may also have prevailed in large parts of Lake Ladoga. The low pollen concentration in the Ladoga sediments before 11.2 cal.…”

Section: Vegetation and Climate Changesmentioning

confidence: 99%

Vegetation and climate changes in northwestern Russia during the Lateglacial and Holocene inferred from the Lake Ladoga pollen record

Savelieva

Andreev

Gromig

et al. 2019

Boreas

View full text Add to dashboard Cite

The new pollen record from the upper 12.75 m of a sediment core obtained in Lake Ladoga documents regional vegetation and climate changes in northwestern Russia over the last 13.9 cal. ka. The Lateglacial chronostratigraphy is based on varve chronology, while the Holocene stratigraphy is based on AMS 14 C and OSL dates, supported by comparison with regional pollen records. During the Lateglacial (c. 13.9-11.2 cal. ka BP), the Lake Ladoga region experienced several climatic fluctuations as reflected in vegetation changes. Shrub and grass communities dominated between c. 13.9 and 13.2 cal. ka BP. The increase in Picea pollen at c. 13.2 cal. ka BP probably reflects the appearance of spruce in the southern Ladoga region at the beginning of the Allerød interstadial. After c. 12.6 cal. ka BP, the Younger Dryas cooling caused a significant decrease in spruce and increase in Artemisia with other herbs, indicative of tundra-and steppe-like vegetation. A sharp transition from tundra-steppe habitats to sparse birch forests characterizes the onset of Holocene warming c. 11.2 cal. ka BP. Pine forests dominated in the region from c. 9.0 to 8.1 cal. ka BP. The most favourable climatic conditions for deciduous broad-leaved taxa existed between c. 8.1 and 5.5 cal. ka BP. Alder experiences an abrupt increase in the local vegetation c. 7.8 cal. ka BP. The decrease in tree pollen taxa (especially Picea) and the increase in herbs (mainly Poaceae) probably reflect human activity during the last 2.2 cal. ka. Pine forests have dominated the region since that time. Secale and other Cerealia pollen as well as ruderal herbs are permanently recorded since c. 0.8 cal. ka BP.

show abstract

Palaeoecological implications of the subfossil Pediastrum argentinense-type in Europe

Cited by 11 publications

References 33 publications

Late Pleistocene lake level, glaciation and climate change in the Mongolian Altai deduced from sedimentological and palynological archives

Late Pleistocene lake level, glaciation and climate change in the Mongolian Altai deduced from sedimentological and palynological archives

Evolutionary relationships between the varieties of green algae Pediastrum boryanum and P. duplex s.l. (Chlorophyceae, Hydrodictyaceae)

Vegetation and climate changes in northwestern Russia during the Lateglacial and Holocene inferred from the Lake Ladoga pollen record

Contact Info

Product

Resources

About