Long-term changes in floristic diversity in southern Sweden: palynological richness, vegetation dynamics and land-use

Berglund, Björn; Gaillard, Marie-José; Björkman, Leif; Persson, Thomas

doi:10.1007/s00334-007-0094-x

Cited by 94 publications

(106 citation statements)

References 28 publications

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“…However, when one considers the date of publication (1974) it is clear that the boundaries are given in 14 C years (Conv BP). A problem arises because Mangerud's chronozones have been used extensively up to the present day (Webb 2006;Anderson et al 2007;Berglund et al 2008;Haynes 2008;RybníËek and RybníËková 2008;Sørensen 2008;Wanner et al 2008;Niinemets and Hang 2009;Walker et al 2009). …”

Section: The Problemmentioning

confidence: 99%

Calibration of Mangerud'S Boundaries

Walanus

Nalepka

2010

Radiocarbon

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ABSTRACT.The "calibration" of arbitrarily defined (in some sense, "conventional") ages, given in conventional radiocarbon years BP, is now becoming necessary because the term "radiocarbon age" is used less often in archaeological and Quaternary practice. The standard calibration procedure is inappropriate here because Mangerud's boundaries are not measurement results. Thus, another approach to the problem is proposed in order to model the natural situation of many, uniformly distributed, dated samples, which should be similarly divided by the original and "calibrated" boundary. However, the result depends on the value of the typical measurement error and is not unequivocal.

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Section: The Problemmentioning

confidence: 99%

Calibration of Mangerud'S Boundaries

Walanus

Nalepka

2010

Radiocarbon

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“…1) were proposed by Freschet et al (2014): (1) organic matter deposition, both by the Sami and their herds; (2) soil compaction through trampling; (3) destruction of the field layer; (4) selective felling of Pinus sylvestris for fuel and building purposes. Palynologically, the creation of local openings in the boreal forests of northern Fennoscandia, to provide spaces for dwellings and livestock, is recognizable by a decline in trees (Hicks 1976;Vuorela 1976;Berglund et al 2008). An increase in Poaceae forms the main response among non-arboreal taxa, but the strength of this signal in the palynological record weakens with increasing distance from the disturbance (Suominen 1975;Aronsson 1991;Hicks 1993;Aronsson 1994).…”

Section: Introductionmentioning

confidence: 99%

High-resolution palynology reveals the land use history of a Sami renvall in northern Sweden

Kamerling

Schofield

Edwards

et al. 2016

Veget Hist Archaeobot

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The limited availability of historical and archaeological evidence means that much is still unknown about the development of Sami reindeer herding in Fennoscandia in both the recent and more distant past. To address this problem, high-resolution palynological analyses, 14 C and 210 Pb dating were undertaken on two adjacent (\25 m apart) peat profiles collected at a recently abandoned reindeer gathering pen (renvall) near Jokkmokk (*66.6°N, 19.8°E) in the boreal forest of northern Sweden. The aim was to assess the impact of Sami reindeer herding on the local environment through a study of pollen, coprophilous fungal spores, microscopic charcoal and sedimentology. The samples collected from within an annex to the renvall indicate cycles of use and abandonment of the pen on a multi-decadal timescale between *AD 1800-2008, most obviously in the coprophilous fungal spore archive. The pattern and timing of these cycles confirm events previously known only from oral histories. Although the local pollen assemblage zones associated with the phasing of activity were reproducible in a second peat core beyond the boundary of the renvall, the coprophilous fungal spore signal in this paired profile was much less distinctive, possibly due to the typically shorter dispersal distances for these microfossils in comparison to pollen grains.

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“…Zea and Cereale in Poaceae). Nonetheless, palynological richness is often used as an indicator of past species richness, either explicitly or implicitly (Birks & Line 1992;Jaramillo, Rueda & Mora 2006;Berglund et al 2008;Birks & Birks 2008;Brown et al 2008;van der Knaap 2009; Morales-Molino, Garc õa Ant on & Morla 2011; Colombaroli et al 2012), despite the fact that the relationship between plant richness and pollen richness has not been well studied. While pollen richness at a site may vary over time, temporal changes in richness may not be directly correlated with regional plant species richness.…”

Section: Introductionmentioning

confidence: 99%

Pollen assemblage richness does not reflect regional plant species richness: a cautionary tale

et al. 2013

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Summary1. Palaeoecological records of species richness spanning time intervals over which climate variables have shifted relative to one another can help reduce issues of colinearity that might affect our understanding of patterns of species richness.2. Fossil pollen assemblages have the potential to serve as a proxy for past plant richness because they record the presence of plant taxa. However, pollen assemblages are typically limited by low taxonomic resolution and taphonomic processes (pollen production, transport, deposition and preservation), which may degrade the degree to which pollen accurately represents vegetation communities.3. We combined pollen assemblages from modern lake sediments (n = 546; n = 167 in British Columbia, Canada) in the Pacific Northwest, with a detailed data base (n = 16 071) of plant presence across the province and a published record of gamma richness to test the accuracy of pollen assemblages as a proxy for regional patterns of plant richness. 4.A generalized linear model using plant richness resolved at multiple taxonomic levels suggests taxonomic differences between plant and pollen taxa may reduce the ability of pollen richness to predict plant richness at the site level, but that this relationship is still recoverable, albeit with broad confidence intervals. 5.Spatially explicit analysis using a generalized additive model shows that predicted plant richness has no relationship with raw pollen assemblage richness at all taxonomic levels.6. The taxonomic composition of the region (i.e. the ratio of wind-pollinated to insect-pollinated species) and/ or the morphological specificity of the dominant pollen types in the region may play a role in limiting the reconstruction of plant richness from pollen richness. Nonetheless, we believe this study is the first to empirically test the relationship between plant and pollen richness, and fails to find a significant relationship.7. Synthesis. Palynological richness in itself cannot be considered a universally reliable proxy for inferring plant richness; however, broad spatial and temporal patterns of change in richness have been reported in the literature. Our findings suggest that more work is needed to understand previously reported patterns of pollen assemblage richness through time and in space. We suggest the use of functional diversity or phylogenetically based analysis may help link pollen richness to plant community richness.

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Long-term changes in floristic diversity in southern Sweden: palynological richness, vegetation dynamics and land-use

Cited by 94 publications

References 28 publications

Calibration of Mangerud'S Boundaries

Calibration of Mangerud'S Boundaries

High-resolution palynology reveals the land use history of a Sami renvall in northern Sweden

Pollen assemblage richness does not reflect regional plant species richness: a cautionary tale

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