TY  - JOUR
A1  - Pailles, Christine
A1  - Sylvestre, Florence
A1  - Escobar, Jaime
A1  - Tonetto, Alain
A1  - Rustig, Sybille
A1  - Mazur, Jean-Charles
T1  - Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Peten-Itza, Guatemala, Central America
JF  - Phytotaxa : a rapid international journal for accelerating the publication of botanical taxonomy
N2  - While analyzing the fossil diatom flora in one of the longest paleolimnological records (core PI-6) from Lake Peten-Itza, lowland Guatemala, we encountered Aulacoseira Thwaites, Cyclotella (Kutzing) and Discostella (Cleve & Grunow) Houk & Klee species appearing successively in the record. Among them, two new species that are assigned to the genus Cyclotella are described herein. Cyclotella petenensis sp. nov. is characterised by a coarse striation marked by a shadow line and a tangentially undulate central area with an arc of central fultoportulae. Cyclotella cassandrae sp. nov. has an elliptically shaped valve, coarse striae and a scattered ring of central fultoportulae in the central area. Classification and differences to similar taxa in the genus Cyclotella are discussed.
KW  - Diatom
KW  - Cyclotella
KW  - Pleistocene
KW  - Lake Peten-Itza
KW  - Guatemala
Y1  - 2018
U6  - https://doi.org/10.11646/phytotaxa.351.4.1
SN  - 1179-3155
SN  - 1179-3163
VL  - 351
IS  - 4
SP  - 247
EP  - 263
PB  - Magnolia Press
CY  - Auckland
ER  - 
TY  - JOUR
A1  - Weber, Michael
A1  - Scholz, Denis
A1  - Schröder-Ritzrau, Andrea
A1  - Deininger, Michael
A1  - Spötl, Christoph
A1  - Lugli, Federico
A1  - Mertz-Kraus, Regina
A1  - Jochum, Klaus Peter
A1  - Fohlmeister, Jens Bernd
A1  - Stumpf, Cintia F.
A1  - Riechelmann, Dana F. C.
T1  - Evidence of warm and humid interstadials in central Europe during early MISSUE 3 revealed by a multi-proxy speleothem record
JF  - Quaternary science reviews : the international multidisciplinary research and review journal
N2  - Marine Isotope Stage 3 (MIS 3, 57-27 ka) was characterised by numerous rapid climate oscillations (i.e., Dansgaard-Oeschger (D/O-) events), which are reflected in various climate archives. So far, MIS 3 speleothem records from central Europe have mainly been restricted to caves located beneath temperate Alpine glaciers or close to the Atlantic Ocean. Thus, MIS 3 seemed to be too cold and dry to enable speleothem growth north of the Alps in central Europe. Here we present a new speleothem record from Bunker Cave, Germany, which shows two distinct growth phases from 52.0 (+0.8, -0.5) to 50.9 (+0.6, -1.3) ka and 473 (+1.0, -0.6) to 42.8 (+/- 0.9) ka, rejecting this hypothesis. These two growth phases potentially correspond to the two warmest and most humid phases in central Europe during MIS 3, which is confirmed by pollen data from the nearby Eifel. The hiatus separating the two phases is associated with Heinrich stadial 5 (HS 5), although the growth stop precedes the onset of HS 5. The first growth phase is characterised by a fast growth rate, and Mg concentrations and Sr isotope data suggest high infiltration and the presence of soil cover above the cave. The second growth phase was characterised by drier, but still favourable conditions for speleothem growth. During this phase, the delta C-13 values show a significant decrease associated with D/O-event 12. The timing of this shift is in agreement with other MIS 3 speleothem data from Europe and Greenland ice core data. (C) 2018 Elsevier Ltd. All rights reserved.
KW  - Speleothems
KW  - Pleistocene
KW  - Palaeoclimatology
KW  - Europe
KW  - Dansgaard-Oeschger event
KW  - Marine isotope stage 3
KW  - Bunker cave
KW  - Multi-proxy approach
KW  - U-Th series
Y1  - 2018
U6  - https://doi.org/10.1016/j.quascirev.2018.09.045
SN  - 0277-3791
VL  - 200
SP  - 276
EP  - 286
PB  - Elsevier
CY  - Oxford
ER  -