Rick Battarbee and his many contributions to palaeolimnology

Birks, H. John B.; Smol, John P.

doi:10.1007/s10933-012-9661-y

Cited by 11 publications

(14 citation statements)

References 204 publications

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“…Conventional methods to develop a transfer function were applied (Birks, 1998). Percentages of taxa were used.…”

Section: Statistical Analyses and Development Of A Transfer Functionmentioning

confidence: 99%

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Using a newly developed chironomid transfer function for reconstructing mean annual air temperature at Lake Potrok Aike, Patagonia, Argentina

Massaferro

Larocque‐Tobler²

2013

Ecological Indicators

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“…Conventional methods to develop a transfer function were applied (Birks, 1998). Percentages of taxa were used.…”

Section: Statistical Analyses and Development Of A Transfer Functionmentioning

confidence: 99%

“…Partial-least-square (PLS) would be used in the case of linear distribution (ter Braak and Šmilauer, 2002). The components to include in the model are chosen when the rootmean-square error of prediction (RMSEP) does not increase more than 5% by adding one more component (Birks, 1998).…”

Section: Statistical Analyses and Development Of A Transfer Functionmentioning

confidence: 99%

Using a newly developed chironomid transfer function for reconstructing mean annual air temperature at Lake Potrok Aike, Patagonia, Argentina

Massaferro

Larocque‐Tobler²

2013

Ecological Indicators

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“…We do not remove any samples based on their bootstrapped residuals. For WAPLS models, we accept the minimum adequate model, only considering the addition of a further component when it offers a decrease in RMSEP exceeding 5% (Barlow et al, 2013; Birks et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

2023

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The late-Quaternary relative sea-level (RSL) history of Ireland is complex, positioned at the margins of the former British-Irish Ice Sheet, and subject to the influence of ice unloading and forebulge collapse. Geophysical models of post-glacial isostatic adjustment (GIA) provide estimates of the pattern of RSL change since deglaciation which may be tested and validated with empirical data from proxy records. For the region of northwest Ireland, there is a paucity of high-quality RSL data and, therefore, equivocal evidence to support the GIA models that predict a mid to Late-Holocene RSL highstand of between +0.5 and +2 m above present. This study aims to investigate this model-data discrepancy by reconstructing RSL change from a near continuous salt-marsh sequence at Bracky Bridge, Donegal, spanning the last ca. 2500 years. We develop a transfer function model to reconstruct the vertical position of sea level using a regional diatom training set to quantify the indicative meaning and predict the palaeomarsh elevation of the core samples. A chronology is provided by a combination of 14C and 210Pb data, with sample specific ages derived from an age-depth model using a Bayesian framework. Our reconstruction shows ca. 2 m of relative sea-level rise in the past 2500 years. This is not compatible with some previously published sea-level index points from the region, which we re-interpret as freshwater/terrestrial limiting data. These results do not provide any evidence to support a Mid-Holocene RSL highstand above present sea level. Whilst none of the available GIA models replicate the timing and magnitude of the Late-Holocene RSL rise in our reconstruction, those which incorporate a thick and extensive British-Irish Sea Ice Sheet provide the best fit.

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“…For a given pollen record with

n

samples and

p

taxa, the assemblage matrix

A

(thus with dimension

n\times p

) consists of proportions obtained by dividing the pollen counts of each taxa by the total pollen counts for a given sample, and therefore the rows of the matrix

A

sum up to 1 by definition. In order to increase the contribution of less frequent taxa and decrease the interdependence of proportion data, we square‐root transform the assemblage matrices before performing the PCA (Birks, 1998). The principal components correspond to the eigenvectors obtained by diagonalization of the (column‐centred) covariance matrix.…”

Section: Methodsmentioning

confidence: 99%

Biome‐ and timescale‐dependence of Holocene vegetation variability in the Northern Hemisphere

Hébert,

Schild,

Laepple

et al. 2023

Ecology and Evolution

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Global climatic changes expected in the next centuries are likely to cause unparalleled vegetation disturbances, which in turn impact ecosystem services. To assess the significance of disturbances, it is necessary to characterize and understand typical natural vegetation variability on multi‐decadal timescales and longer. We investigate this in the Holocene vegetation by examining a taxonomically harmonized and temporally standardized global fossil pollen dataset. Using principal component analysis, we characterize the variability in pollen assemblages, which are a proxy for vegetation composition, and derive timescale‐dependent estimates of variability using the first‐order Haar structure function. We find, on average, increasing fluctuations in vegetation composition from centennial to millennial timescales, as well as spatially coherent patterns of variability. We further relate these variations to pairwise comparisons between biome classes based on vegetation composition. As such, higher variability is identified for open‐land vegetation compared to forests. This is consistent with the more active fire regimes of open‐land biomes fostering variability. Needleleaf forests are more variable than broadleaf forests on shorter (centennial) timescales, but the inverse is true on longer (millennial) timescales. This inversion could also be explained by the fire characteristics of the biomes as fire disturbances would increase vegetation variability on shorter timescales, but stabilize vegetation composition on longer timecales by preventing the migration of less fire‐adapted species.

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Rick Battarbee and his many contributions to palaeolimnology

Cited by 11 publications

References 204 publications

Using a newly developed chironomid transfer function for reconstructing mean annual air temperature at Lake Potrok Aike, Patagonia, Argentina

Using a newly developed chironomid transfer function for reconstructing mean annual air temperature at Lake Potrok Aike, Patagonia, Argentina

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models

Biome‐ and timescale‐dependence of Holocene vegetation variability in the Northern Hemisphere

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