Taxonomy and stratigraphy of late-glacial Pediastrum taxa from Lysmosen, Denmark — a preliminary study

Nielsen, H.; Sørensen, Ingrid

doi:10.1016/0034-6667(92)90138-7

Cited by 54 publications

(28 citation statements)

References 11 publications

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“…We suppose that the observed Pediastrum-species from Sumin Lake could be taxonomically classified as the same species Pediastrum orientale found by Skuja (1937), Nygaard (1977), Nielsen and Sørensen (1992), Jankovská and Komárek (2001). However, several small differences have been found in our taxon.…”

Section: Resultssupporting

confidence: 66%

“…Later, Nygaard (1977), who has reported this variety from lakes in Greenland, changed its name into Pediastrum orientale. Pediastrum orientale was also found in subfossil sediments from the locality Lysmosen, Denmark (Nielsen and Sørensen 1992). The only locality of this species in Poland was reported by Wo³owski et al (2002) from ¯abie oko peat bog in the Tatra Mountains.…”

Section: Resultsmentioning

confidence: 83%

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Pediastrum species (Hydrodictyaceae, Sphaeropleales) in phytoplankton of Sumin Lake (Łęczna-Włodawa Lakeland)

Pasztaleniec

Poniewozik

2011

Acta Soc Bot Pol

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During studies of phytoplankton in Sumin Lake (Łęczna-Włodawa Lakeland), conducted from May till September 2001 and 2002, 15 taxa of the genus Pediastrum (Hydrodictyaceae, Sphaeropleales) were found. Among them there were common species as Pediastrum boryanum, P. duplex, P. tetras and P. simplex, but also rare species as P. integrum or P. kawraiskyi. An especially interesting species was P. orientale, the taxon that until now has not been noted in phytoplankton of Polish water bodies. The paper gives descriptions of the genus Pediastrum coenobia and physico-chemical conditions of the habitat. The original documentation of Pediastrum taxa is added

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 83%

Pediastrum species (Hydrodictyaceae, Sphaeropleales) in phytoplankton of Sumin Lake (Łęczna-Włodawa Lakeland)

Pasztaleniec

Poniewozik

2011

Acta Soc Bot Pol

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“…Pediastrum species are radially-symmetrical colonial green algae that inhabit freshwater environments (Nielsen and Sørensen, 1992;Jankovska and Komárek, 1995;Batten, 1996). An extant Pediastrum presents in a wide range of environmental response (Batten, 1996).…”

Section: Temperature and Precipitationmentioning

confidence: 99%

Vegetation changes in western central region of Korean Peninsula during the last glacial (ca. 21.1–26.1 cal kyr BP)

Kim

2010

Geosci J

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Age-controlled pollen record from wetland sediments of Hanam, western central Korean Peninsula (KP), reveals vegetation dynamics response to climate changes during the last glacial, 26.1−20.1 cal kyr BP. The Hanam pollen assemblages are dominated by conifers, Picea and Pinus and cold tolerant deciduous broadleaved Betula, together with common xerophytic herb like Artemisia and Gramineae. Principal taxa are similar to those of subalpine forest in modern vegetation of KP. Humidity variation reconstructed by semi aridity index (AI) indicates that, during 26.1−22.7 cal kyr BP, cold and dry conditions were prevailed with an expansion of subalpine coniferous forest and high value of AI. From 22.5 to 20.5 cal kyr BP, cool and wet conditions were reconstructed with low value of AI due to climatic amelioration, enhanced conifers and temperate deciduous broadleaved mixed forests flourished. Between 20.3 and 20.1 cal kyr BP, an abundance of Picea and Betula associated with high value of AI infers that subalpine conifers forest colonized again in hinterland montane along with open, low grassland under colder and drier conditions owing to climatic deterioration. The principal pollen taxa suggest that prevailing climate conditions were annual mean temperature about 5−6 o C colder and annual mean precipitation 40% drier than today.

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“…7) des Pediastrum sp. diminue irrégulièrement au Petit lac Bouchard, traduisant ainsi une turbidité croissante et un appauvrissement graduel des eaux en éléments nutritifs (Smol, 1990 ;Nielsen et Sorensen, 1992). Au lac du Triangle, cette tendance générale n'est pas enregistrée mais, durant l'épisode de tourbière riveraine, la représentation des Pediastrum chute fortement ( fig.…”

Section: Phase Initiale à Berges Dénudéesunclassified

La végétation et le climat postglaciaires du centre et de l’est de la Gaspésie, au Québec

Asnong

Richard

2005

gpq

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Résumé L’analyse pollinique et macrofossile des sédiments de deux lacs a livré l'histoire postglaciaire de la végétation au centre (lac du Triangle [48° 42’ 36’’ N, 65° 24’ 50’’ O]) et à l’est (Petit lac Bouchard [48° 51’ 14’’ N, 64° 35’ 52’’ O]) de la Gaspésie. Une toundra éparse à bouleau glanduleux s'est installée dès 11 200 BP (années étalonnées). L’afforestation s’effectue par l’entremise de l’épinette noire accompagnée ou non de peuplier faux-tremble vers 10 700 BP. La multiplication des populations d’épinette noire s’est ralentie ou a cessé vers 10 000 BP au profit de l'aulne crispé et du tremble, pendant une période où les feux étaient fréquents. La forêt fermée a mis un millénaire pour se constituer au centre de la Gaspésie mais dans l’est, il lui a fallu plus de 2000 ans. Cette longue période d’afforestation est attribuée à un climat maritime froid. Durant la phase forestière, les taxons régionalement thermophiles comme le pin blanc et le bouleau jaune ne se sont établis que dans la partie orientale, le centre de la Gaspésie restant dominé par des essences boréales : le sapin baumier, l'épinette noire et, dans une moindre mesure, le bouleau blanc. Le pin gris, aujourd’hui absent de la Gaspésie, était présent dans la région du lac du Triangle dès l’afforestation et jusque vers 3500 BP. Depuis 3500 ans, l'épinette noire et le sapin baumier se multiplient aux dépens des bouleaux dans les deux régions, traduisant ainsi l'instauration d'un climat plus humide et plus frais. Toutefois, le contraste avec la période antérieure est plus fort à l'est qu'au centre de la Gaspésie. Une première reconstitution des variations paléohydriques fondée sur les changements du niveau d’eau des lacs est proposée.

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Taxonomy and stratigraphy of late-glacial Pediastrum taxa from Lysmosen, Denmark — a preliminary study

Cited by 54 publications

References 11 publications

Pediastrum species (Hydrodictyaceae, Sphaeropleales) in phytoplankton of Sumin Lake (Łęczna-Włodawa Lakeland)

Pediastrum species (Hydrodictyaceae, Sphaeropleales) in phytoplankton of Sumin Lake (Łęczna-Włodawa Lakeland)

Vegetation changes in western central region of Korean Peninsula during the last glacial (ca. 21.1–26.1 cal kyr BP)

La végétation et le climat postglaciaires du centre et de l’est de la Gaspésie, au Québec

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