Problems in the recognition of plant communities in pollen diagrams

Janssen, Colin

doi:10.1007/bf01965532

Cited by 40 publications

(8 citation statements)

References 19 publications

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“…Pollen types from plants growing in the studied polygon were excluded from the sum in order to rule out disturbing (extra)local effects that would severely hamper interpretation of the palynological data set (cf. Janssen 1970, 1981a; de Klerk 2004). Relative values of pollen and spores (Fig.…”

Section: Methodsmentioning

confidence: 99%

Vegetation patterns, recent pollen deposition and distribution of non‐pollen palynomorphs in a polygon mire near Chokurdakh (NE Yakutia, NE Siberia)

Klerk¹,

Donner²,

Joosten³

et al. 2009

Boreas

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Fine-scaled distribution patterns of vegetation and palynomorphs in a polygon mire in NE Siberia were studied in 31Â31 plots of 1 m 2 (vegetation) and along a transect at intervals of 1 m (palynomorphs). Pollen and non-pollenpalynomorph contents clearly reflect differences between polygon ridges and centres. For most single pollen types, however, no unambiguous relation with actual plant abundances and distribution exists. High pollen values are restricted to the immediate vicinity of the pollen sources, which is attributed to the low height of the vegetation. For several plant taxa, high pollen values were found to be restricted to particular plant specimens in the population. High values of pollen ascribed to taxa currently absent at the relevant plot show that the sampled mosses contain a pollen signal of several years. Betula exilis produces two morphologically clearly distinct pollen types. The distribution of selected non-pollen palynomorphs correlates to microrelief, moisture regime and/or trophic conditions. The study shows that single palaeo-sections from arctic peatlands should not be over-interpreted with respect to their palaeoecological value. Local vegetation types and site conditions, however, can be accurately reconstructed from the total assemblages and from combined occurrences of specific palynomorph types. Pim de Klerk

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Section: Methodsmentioning

confidence: 99%

Vegetation patterns, recent pollen deposition and distribution of non‐pollen palynomorphs in a polygon mire near Chokurdakh (NE Yakutia, NE Siberia)

Klerk¹,

Donner²,

Joosten³

et al. 2009

Boreas

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“…The communities which at present characterize Upper Teesdale cannot, or should not, be traced back more than 5000 years (Janssen, 1970;Squires, 1970;Turner et al, 1973), although the processes to which the communities are subject may be of great antiquity. Obviously this cannot be entirely true because the hypothesis is that closed communities containing rarities are a recent phenomenon.…”

Section: Interest Of Upper Teesdalementioning

confidence: 97%

Conservation in Upper Teesdale: Contributions from the Palaeoecological Record

Squires¹

1978

Transactions of the Institute of British Geographers

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“…Surface pollen analysis is a prerequisite to reconstruct past vegetation and climate (Janssen 1970;Birks & Birks 1980;Bradley 1985;Overpeck et al 1985;Birks 1993; Barboni et al 2004). However, because of uncertainties in pollen dispersal and deposition such as pollen production, dispersal ability and basin size, the pollen assemblage does not necessarily correspond the vegetation composition (Davis & Goodlett 1960;Whitehead & Tan 1969;Kennedy et al 2005).…”

Section: Introductionmentioning

confidence: 99%