Diatoms as indicators of environmental change in ancient Lake Ohrid during the last glacial–interglacial cycle (ca. 140 ka)

Phycologia ◽  
2013 ◽  
Vol 52 (4) ◽  
pp. 379-380
Author(s):  
Mark B. Edlund
Keyword(s):  
Environmental Change ◽  
Ancient Lake ◽  
Lake Ohrid ◽  
Last Glacial ◽  
The Last Glacial

scholarly journals The last glacial-interglacial cycle in Lake Ohrid (Macedonia/Albania): testing diatom response to climate

2010 ◽  
Vol 7 (3) ◽  
pp. 4689-4714 ◽  
Author(s):  
J. M. Reed ◽  
A. Cvetkoska ◽  
Z. Levkov ◽  
H. Vogel ◽  
B. Wagner
Keyword(s):  
Morphological Variability ◽  
Central Area ◽  
Early Holocene ◽  
Future Research ◽  
Lake Basin ◽  
Last Interglacial ◽  
Lake Ohrid ◽  
Concentration Data ◽  
Last Glacial ◽  
The Last Glacial

Abstract. Lake Ohrid is a site of global importance for palaeoclimate research. This study presents results of diatom analysis of a ca. 136 ka sequence, Co1202, from the northeast of the lake basin. It offers the opportunity to test diatom response across two glacial-interglacial transitions and within the Last Glacial, while setting up taxonomic protocols for future research. The results are outstanding in demonstrating the sensitivity of diatoms to climate change, providing proxy evidence for temperature change marked by glacial-interglacial shifts between the dominant planktonic taxa, Cyclotella fottii and C. ocellata, and exact correlation with geochemical proxies to mark the start of the Last Interglacial at ca. 130 ka. Importantly, diatoms show much stronger evidence in this site for warming during MIS3 than recorded in other productivity-related proxies, peaking at ca. 39 ka, prior to the extreme conditions of the Last Glacial maximum. In the light of the observed patterns, and from the results of analysis of early Holocene sediments from a second core, Lz1120, the lack of a response to Late Glacial and early Holocene warming from ca. 15–7.4 ka suggests the Co1202 sequence may be compromised during this phase. After ca. 7.4 ka, there is evidence for enhanced nutrient enrichment compared to the Last Interglacial, following by a post-Medieval cooling trend. Taxonomically, morphological variability in C. fottii shows no clear trends linked to climate, but an intriguing change in central area morphology occurs after ca. 48.7 ka, coincident with a tephra layer. In contrast, C. ocellata shows morphological variation in the number of ocelli between interglacials, suggesting climatically-forced variation or evolutionary selection pressure. The application of a simple dissolution index does not track preservation quality very effectively, underlining the importance of diatom concentration data in future studies.

scholarly journals Cliff-front aeolian and colluvial deposits, Mallorca, Western Mediterranean: a record of climatic and environmental change during the last glacial period

2001 ◽  
Vol 48 ◽  
pp. 217-232
Author(s):  
Lars B. Clemmensen ◽  
Thomas Lisborg ◽  
Richard G. Bromley ◽  
Joan J. Fornós
Keyword(s):  
Environmental Change ◽  
Environmental Changes ◽  
Western Mediterranean ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
Aeolian Deposits ◽  
Climatic And Environmental Change ◽  
Sea Cliff ◽  
The Last Glacial

Large, cliff-front accumulations of Late Pleistocene aeolian and colluvial deposits on southeast Mallorca provide a terrestrial record of climatic and environmental change in the Western Mediterranean during the last glacial period. The cliff-front deposits are lithified and form ramps sloping toward the southeast (i.e. seaward). Radiocarbon dating suggests that the deposits formed in Oxygen Isope Stage 3, when sea level was about 50 m lower than today, and the fossil sea-cliff situated 1.5 to 2 km from the palaeo-shore. The aeolian deposits are composed of marine carbonate sand that was transported inland episodically and accumulated in embayments along the fossil sea-cliff. The sand initially formed steadily growing and forward-moving dunes, then sloping sand ramps and finally relatively small ascending dunes. Aeolian accumulation was interrupted by erosion and colluvial ramp formation, and the cliff-front sediments can be divided into two sedimentary cycles each composed of basal colluvial deposits overlain by aeolian deposits. Colluvial deposition probably records relatively humid climatic intervals, whereas aeolian accumulation probably reflects relatively arid climatic intervals. It appears that climatic and environmental changes were rapid, and it is speculated that the dynamics of the cliff-front system on Mallorca were tied to North Atlantic millennial-scale climate oscillations.

scholarly journals The last glacial-interglacial cycle in Lake Ohrid (Macedonia/Albania): testing diatom response to climate

2010 ◽  
Vol 7 (10) ◽  
pp. 3083-3094 ◽  
Author(s):  
J. M. Reed ◽  
A. Cvetkoska ◽  
Z. Levkov ◽  
H. Vogel ◽  
B. Wagner
Keyword(s):  
Morphological Variability ◽  
Central Area ◽  
Late Glacial ◽  
Early Holocene ◽  
Future Research ◽  
Lake Basin ◽  
Last Interglacial ◽  
Lake Ohrid ◽  
Last Glacial ◽  
The Last Glacial

Abstract. Lake Ohrid is a site of global importance for palaeoclimate research. This study presents results of diatom analysis of a ca. 136 ka sequence, Co1202, from the northeast of the lake basin. It offers the opportunity to test diatom response across two glacial-interglacial transitions and within the Last Glacial, while setting up taxonomic protocols for future research. The results are outstanding in demonstrating the sensitivity of diatoms to climate change, providing proxy evidence for temperature change marked by glacial-interglacial shifts between the dominant planktonic taxa, Cyclotella fottii and C. ocellata, and exact correlation with geochemical proxies to mark the start of the Last Interglacial at ca. 130 ka. Importantly, diatoms show much stronger evidence in this site for warming during MIS3 than recorded in other productivity-related proxies, peaking at ca. 39 ka, prior to the extreme conditions of the Last Glacial maximum. In the light of the observed patterns, and from the results of analysis of early Holocene sediments from a second core, Lz1120, the lack of a response to Late Glacial and early Holocene warming from ca. 14.7–6.9 ka suggests the Co1202 sequence may be compromised during this phase. After ca. 7.4 ka, there is evidence for enhanced nutrient enrichment compared to the Last Interglacial, followed by a post-Medieval loss of diversity which is consistent with cooling, but not definitive. Taxonomically, morphological variability in C. fottii shows no clear trends linked to climate, but an intriguing change in central area morphology occurs after ca. 48.7 ka, coincident with a tephra layer. In contrast, C. ocellata shows morphological variation in the number of ocelli between interglacials, suggesting climatically-forced variation or evolutionary selection pressure. The application of a simple dissolution index does not track preservation quality very effectively, underlining the importance of diatom accumulation data in future studies.

A paleoclimate record with tephrochronological age control for the last glacial-interglacial cycle from Lake Ohrid, Albania and Macedonia

2010 ◽  
Vol 44 (1) ◽  
pp. 295-310 ◽  
Author(s):  
Hendrik Vogel ◽  
Bernd Wagner ◽  
Giovanni Zanchetta ◽  
Roberto Sulpizio ◽  
Peter Rosén
Keyword(s):  
Lake Ohrid ◽  
Last Glacial ◽  
The Last Glacial

Environmental change during the last glacial on an ancient land bridge of southeast Australia

2021 ◽  
Author(s):  
Matthew Adesanya Adeleye ◽  
Simon Graeme Haberle ◽  
David McWethy ◽  
Simon Edward Connor ◽  
Janelle Stevenson
Keyword(s):  
Environmental Change ◽  
Land Bridge ◽  
Last Glacial ◽  
Southeast Australia ◽  
The Last Glacial

scholarly journals Lake Ohrid, Albania, provides an exceptional multi-proxy record of environmental changes during the last glacial–interglacial cycle

2010 ◽  
Vol 287 (1-4) ◽  
pp. 116-127 ◽  
Author(s):  
A.-M. Lézine ◽  
U. von Grafenstein ◽  
N. Andersen ◽  
S. Belmecheri ◽  
A. Bordon ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Lake Ohrid ◽  
Proxy Record ◽  
Last Glacial ◽  
The Last Glacial

A 40,000-year record of environmental change from ancient Lake Ohrid (Albania and Macedonia)

2008 ◽  
Vol 41 (3) ◽  
pp. 407-430 ◽  
Author(s):  
Bernd Wagner ◽  
André F. Lotter ◽  
Norbert Nowaczyk ◽  
Jane M. Reed ◽  
Antje Schwalb ◽  
...  
Keyword(s):  
Environmental Change ◽  
Ancient Lake ◽  
Lake Ohrid
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