NDLI: The potential of stomata analysis in conifers to estimate presence of conifer trees: examples from the Alps

Content Provider	Springer Nature Link
Author	Ammann, Brigitta Knaap, Willem O. Lang, Gerhard Gaillard, Marie José Kaltenrieder, Petra Rösch, Manfred Finsinger, Walter Wright, Herbert E. Tinner, Willy
Copyright Year	2014
Abstract	To estimate whether or not a plant taxon found in the fossil record was locally present may be difficult if only pollen is analyzed. Plant macrofossils, in contrast, provide a clear indication of a taxon’s local presence, although in some lake sediments or peats, macrofossils may be rare or degraded. For conifers, the stomata found on pollen slides are derived from needles and thus provide a valuable proxy for local presence and they can be identified to genus level. From previously published studies, a transect across the Alps based on 13 sites is presented. For basal samples in sandy silt above the till with high pollen values of Pinus, for example, we may distinguish pine pollen from distant sources (samples with no stomata), from reworked pollen (samples with stomata present). The first apparent local presence of most conifer genera based on stomata often but not always occurs together with the phase of rapid pollen increase (rational limit). An exception is Larix, with its annual deposition of needles and heavy poorly dispersed pollen, for it often shows the first stomata earlier, at the empirical pollen limit. The decline and potential local extinction of a conifer can sometimes be shown in the stomata record. The decline may have been caused by climatic change, competition, or human impact. In situations where conifers form the timberline, the stomata record may indicate timberline fluctuations. In the discussion of immigration or migration of taxa we advocate the use of the cautious term “apparent local presence” to include some uncertainties. Absence of a taxon is impossible to prove.
Starting Page	249
Ending Page	264
Page Count	16
File Format	PDF
ISSN	09396314
Journal	Vegetation History and Archaeobotany
Volume Number	23
Issue Number	3
e-ISSN	16176278
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stomata Conifers Presence–absence of plant taxa Apparent local presence European Alps Paleontology Biogeosciences Climate Change Anthropology Archaeology
Content Type	Text
Resource Type	Article
Subject	Plant Science Archeology (arts and humanities) Paleontology

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