Response times in bio- and isotopestratigraphies to Late-Glacial climatic shifts: an example from lake deposits

Ammann, Brigitta (1989). Response times in bio- and isotopestratigraphies to Late-Glacial climatic shifts: an example from lake deposits. Eclogae Geologicae Helvetiae, 82(1), pp. 183-190. Birkhäuser 10.5169/seals-166371

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Changes in vegetation, insect assemblages and oxygen-isotope ratios between 14,000 BP and 9,000 BP and their climatic interpretation are summarized for Lobsigensee. a site in the Swiss lowland. A Juniperus peak, the first occurrence of Typha latifolia, a first find of Donacia cinerea and a shift in δ18O all point to rapidly increasing temperatures at around 12,600 BP. A second rise in temperature is recorded by vegetation and oxygen isotopes at around 10.000 BP.
δ18O, beetles and waterplants seem to reflect the climatic change with no or very short response-times. Corylus, however, arrives after a long lag, which may partly be due to slow dispersal, partly to high seasonality (very cold winters) during the Younger Dryas (11,000 to 10,000 BP).
In order to understand the biotic response to a changing climate, it is necessary to study not only closely tracing species, but a variety of taxa with different life-cycle characteristics.

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