Biome‐ and timescale‐dependence of Holocene vegetation variability in the Northern Hemisphere DOI Creative Commons
Raphaël Hébert, Laura Schild, Thomas Laepple

et al.

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(10)

Published: Oct. 1, 2023

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

Language: Английский

Paleorecords Reveal Biological Mechanisms Crucial for Reliable Species Range Shift Projections Amid Rapid Climate Change DOI Creative Commons
Victor Van der Meersch, E. M. Armstrong, Florent Mouillot

et al.

Ecology Letters, Journal Year: 2025, Volume and Issue: 28(2)

Published: Feb. 1, 2025

ABSTRACT The recent acceleration of global climate warming has created an urgent need for reliable projections species distributions, widely used by natural resource managers. Such have been mainly produced distribution models with little information on their performances in novel climates. Here, we hindcast the range shifts forest tree across Europe over last 12,000 years to compare reliability three different types models. We show that most climatically dissimilar conditions, process‐explicit (PEMs) tend outperform correlative (CSDMs), and PEM are likely be more than those made CSDMs end 21st century. These results demonstrate first time often promoted albeit so far untested idea explicit description mechanisms confers model robustness, highlight a new avenue increase projection future.

Language: Английский

Citations

2
LegacyClimate 1.0: a dataset of pollen-based climate reconstructions from 2594 Northern Hemisphere sites covering the last 30 kyr and beyond DOI Creative Commons
Ulrike Herzschuh, Thomas Böhmer, Chenzhi Li

et al.

Earth system science data, Journal Year: 2023, Volume and Issue: 15(6), P. 2235 - 2258

Published: June 2, 2023

Abstract. Here we describe LegacyClimate 1.0, a dataset of the reconstruction mean July temperature (TJuly), annual (Tann), and precipitation (Pann) from 2594 fossil pollen records Northern Hemisphere, spanning entire Holocene, with some reaching back to Last Glacial Period. Two methods, modern analog technique (MAT) weighted averaging partial least squares regression (WA-PLS), reveal similar results regarding spatial temporal patterns. To reduce impact on reconstruction, vice versa, also provide reconstructions using tailored data, limiting range corresponding other climate variables. We assess reliability reconstructions, information distributions root squared error in prediction significance tests. The is beneficial for synthesis studies proxy-based evaluate output models thus help improve themselves. our compilation reconstructed TJuly, Tann, Pann as open-access datasets at PANGAEA (https://doi.org/10.1594/PANGAEA.930512; Herzschuh et al., 2023a). R code provided Zenodo (https://doi.org/10.5281/zenodo.7887565; 2023b), including harmonized used so that customized can be easily established.

Language: Английский

Citations

24
Regional pollen-based Holocene temperature and precipitation patterns depart from the Northern Hemisphere mean trends DOI Creative Commons
Ulrike Herzschuh, Thomas Böhmer, Manuel Chevalier

et al.

Climate of the past, Journal Year: 2023, Volume and Issue: 19(7), P. 1481 - 1506

Published: July 25, 2023

Abstract. A mismatch between model- and proxy-based Holocene climate change, known as the “Holocene conundrum”, may partially originate from poor spatial coverage of reconstructions in, for example, Asia, limiting number grid cells model–data comparisons. Here we investigate hemispheric, latitudinal, regional mean time series time-slice anomaly maps pollen-based annual temperature, July precipitation 1908 records in Northern Hemisphere extratropics. Temperature trends show strong latitudinal patterns differ (sub-)continents. While circum-Atlantic regions Europe eastern North America a pronounced Middle temperature maximum, western shows only weak changes, Asia mostly continuous increase. Likewise, certain peculiarities such maximum 40 50∘ N increasing America, which can all be linked with changes circulation pattern responding to change. Given background heterogeneity, conclude that calculation global or hemispheric means, initiated conundrum debate, should focus more on understanding spatiotemporal their drivers.

Language: Английский

Citations

23
Potential plant extinctions with the loss of the Pleistocene mammoth steppe DOI Creative Commons
Jérémy Courtin, Kathleen R. Stoof‐Leichsenring, Simeon Lisovski

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 14, 2025

Abstract During the Pleistocene-Holocene transition, dominant mammoth steppe ecosystem across northern Eurasia vanished, in parallel with megafauna extinctions. However, plant extinction patterns are rarely detected due to lack of identifiable fossil records. Here, we introduce a method for detection taxa loss at regional (extirpation) potentially global scale (extinction) and their causes, as determined from ancient DNA metabarcoding sediment cores ( sed aDNA) lakes Siberia Alaska over past 28,000 years. Overall, potential extinctions track changes temperature, vegetation, transition. Estimated rates were 1.7–5.9 per million species years (E/MSY), above background but below modern estimates. Major events around 17,000 9000 ago which lag maximum vegetation turnover. Our results indicate that herbaceous contributing less beta diversity more vulnerable extinction. While robustness estimates will increase reference libraries aDNA data expand, available support plants resilient environmental than mammals.

Language: Английский

Citations

1
A guide to the processing and standardization of global palaeoecological data for large‐scale syntheses using fossil pollen DOI Creative Commons
Suzette G. A. Flantua, Ondřej Mottl, Vivian A. Felde

et al.

Global Ecology and Biogeography, Journal Year: 2023, Volume and Issue: 32(8), P. 1377 - 1394

Published: May 2, 2023

Abstract Aim Palaeoecological data are crucial for comprehending large‐scale biodiversity patterns and the natural anthropogenic drivers that influence them over time. Over last decade, availability of open‐access research databases palaeoecological proxies has substantially increased. These open door to questions needing advanced numerical analyses modelling based on big‐data compilations. However, compiling analysing pose unique challenges require a guide producing standardized reproducible Innovation We present step‐by‐step how process fossil pollen into dataset compilation ready macroecological analyses. describe successive criteria will enhance quality Though these project question‐dependent, we discuss most important assumptions should be considered adjusted accordingly. Our is accompanied by an R‐workflow—called FOSSILPOL —and corresponding R‐package—called R‐Fossilpol— provide detailed protocol interdisciplinary users. illustrate workflow sourcing processing Scandinavian datasets show reproducibility continental‐scale processing. Main Conclusions The study through time space requires syntheses datasets. preparation such must transparent reproducible. With our R‐package, optimal handling large compilations reproducibility. also relevant synthesis other as offers synthetic cross‐disciplinary with macroecological, biogeographical perspectives. emphasize expertise informed decisions knowledge remain high‐quality strongly embedded in studies rely increasing amount data.

Language: Английский

Citations

22
Approaches to pollen taxonomic harmonisation in Quaternary palynology DOI Creative Commons
H. J. B. Birks, Kuber P. Bhatta, Vivian A. Felde

et al.

Review of Palaeobotany and Palynology, Journal Year: 2023, Volume and Issue: 319, P. 104989 - 104989

Published: Sept. 16, 2023

Pollen taxonomic harmonisation involves the standardisation of nomenclature pollen and fern spores with similar morphotypes at determination level that is common to all grains or morphotype within sequence(s) interest. Such required prior subsequent investigations such as numerical analysis, comparing, mapping, synthesis, environmental reconstruction involving several sequences. Here we present two approaches harmonisation. These are a 'top-down' 'bottom-up' approach. The bottom-up approach preferred. It based on concept regional flora for in spatial area(s) study. We tables continental sub-continental scales developed Humans Planet Earth (HOPE) project. North America, Latin Europe, Asia (three parts), Indo-Pacific. harmonisations project-specific sequence-specific, relating geographical area sequences under consideration, both which linked research questions being addressed. A new consistent needed when additional areas added. However, HOPE can serve starting point further multi-sequence analyses syntheses.

Language: Английский

Citations

17
Late Glacial and Holocene vegetation and lake changes in SW Yakutia, Siberia, inferred from sedaDNA, pollen, and XRF data DOI Creative Commons
Izabella Baisheva, Boris K. Biskaborn, Kathleen R. Stoof‐Leichsenring

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: April 26, 2024

Only a few palaeo-records extend beyond the Holocene in Yakutia, eastern Siberia, since most of lakes region are thermokarst origin. Thus, we have poor understanding long-term interactions between terrestrial and aquatic ecosystems their response to climate change. The Lake Khamra southwestern Yakutia is particular interest because it transition zones from discontinuous sporadic permafrost summergreen evergreen boreal forests. Our multiproxy study sediments reaching back Last Glacial Maximum 21 cal ka BP, includes analyses organic carbon, nitrogen, XRF-derived elements, sedimentary ancient DNA amplicon sequencing plants diatoms, as well classical counting pollen non-pollen palynomorphs (NPP). palaeogenetic approach revealed 45 diatom, 191 plant, 65 macrophyte taxa. Pollen identified 34 taxa 28 NPP inferred ecosystem comprises tundra vegetation dominated by forbs grasses, likely inhabited megaherbivores. By 18.4 BP lake had developed with high abundance macrophytes dominant fragilarioid while shrubs expanded around lake. In Bølling-Allerød at 14.7 both systems reflect amelioration, alongside water-level rise woodland establishment, which was curbed Younger Dryas cooling. Early warmer wetter led taiga development rise, reflected diatom composition turnover only epiphytic planktonic diatoms. Mid-Holocene water level decreased ca. 8.2 increased again 6.5 BP. At same time mixed evergreen-summergreen forest expanded. Late Holocene, 4 cover similar modern conditions established. This reveals shifts comprehensive catchment history region.

Language: Английский

Citations

4
Dynamic land-plant carbon sources in marine sediments inferred from ancient DNA DOI Creative Commons
Ulrike Herzschuh, J. Weiss, Kathleen R. Stoof‐Leichsenring

et al.

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: Feb. 3, 2025

Language: Английский

Citations

0
Syntheses of pollen-based temperature reconstructions with respect to seasonal and spatiotemporal change in Europe DOI Creative Commons
Rongwei Geng, Mara Weinelt, Wenchao Zhang

et al.

Quaternary Science Reviews, Journal Year: 2025, Volume and Issue: 353, P. 109228 - 109228

Published: Feb. 4, 2025

Language: Английский

Citations

0
Evolution of global vegetation patterns since the last glacial maximum DOI
Junyan Geng, Haibin Wu, Wenchao Zhang

et al.

Quaternary International, Journal Year: 2025, Volume and Issue: 729, P. 109780 - 109780

Published: April 10, 2025

Language: Английский

Citations

0