Topics

Arctic shrub colonization lagged peak postglacial warmth: Molecular evidence in lake sediment from Arctic Canada.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Arctic shrub colonization lagged peak postglacial warmth: Molecular evidence in lake sediment from Arctic Canada."

Arctic shrubification is an observable consequence of climate change, already resulting in ecological shifts and global-scale climate feedbacks including changes in land surface albedo and enhanced evapotranspiration. However, the rate at which shrubs can colonize previously glaciated terrain in a warming world is largely unknown. Reconstructions of past vegetation dynamics in conjunction with climate records can provide critical insights into shrubification rates and controls on plant migration, but paleoenvironmental reconstructions based on pollen may be biased by the influx of exotic pollen to tundra settings. Here, we reconstruct past plant communities using sedimentary ancient DNA (sedaDNA), which has a more local source area than pollen. We additionally reconstruct past temperature variability using bacterial cell membrane lipids (branched glycerol dialkyl glycerol tetraethers) and an aquatic productivity indicator (biogenic silica) to evaluate the relative timing of postglacial ecological and climate changes at a lake on southern Baffin Island, Arctic Canada. The sedaDNA record tightly constrains the colonization of dwarf birch (Betula, a thermophilous shrub) to 5.9 ± 0.1 ka, ~3 ka after local deglaciation as determined by cosmogenic Be moraine dating and >2 ka later than Betula pollen is recorded in nearby lake sediment. We then assess the paleovegetation history within the context of summer temperature and find that paleotemperatures were highest prior to 6.3 ka, followed by cooling in the centuries preceding Betula establishment. Together, these molecular proxies reveal that Betula colonization lagged peak summer temperatures, suggesting that inefficient dispersal, rather than climate, may have limited Arctic shrub migration in this region. In addition, these data suggest that pollen-based climate reconstructions from high latitudes, which rely heavily on the presence and abundance of pollen from thermophilous taxa like Betula, can be compromised by both exotic pollen fluxes and vegetation migration lags.

Affiliation

Journal Details

This article was published in the following journal.

Name: Global change biology
ISSN: 1365-2486
Pages:

Links

DeepDyve research library

PubMed Articles [9922 Associated PubMed Articles listed on BioPortfolio]

Arctic cleansing diet: Sex-specific variation in the rapid elimination of contaminants by the world's champion migrant, the Arctic tern.

Contamination of Arctic marine environments continues to be a concern for wildlife managers. Because the Arctic is a sink for the long-range transport of persistent organic pollutants (POPs), many stu...

Extinction debts and colonization credits of non-forest plants in the European Alps.

Mountain plant species shift their elevational ranges in response to climate change. However, to what degree these shifts lag behind current climate change, and to what extent delayed extinctions and ...

Extensive Land Cover Change Across Arctic-Boreal Northwestern North America from Disturbance and Climate Forcing.

A multitude of disturbance agents, such as wildfires, land use, and climate-driven expansion of woody shrubs, are transforming the distribution of plant functional types across Arctic-Boreal ecosystem...

Life history traits predict colonization and extinction lags of desert plant species since the Last Glacial Maximum.

Variation in life-history strategies can affect metapopulation dynamics and consequently the composition and diversity of communities. However, datasets that allow for the full range of species turnov...

Springtime Nitrogen Oxide-Influenced Chlorine Chemistry in the Coastal Arctic.

Atomic chlorine (Cl) is a strong atmospheric oxidant that shortens the lifetimes of pollutants and methane in the springtime Arctic, where the molecular halogens Cl and BrCl are known Cl precursors. H...

Clinical Trials [2526 Associated Clinical Trials listed on BioPortfolio]

Warmth and Transcutaneous Electrical Nerve Stimulation (TENS) in Improving Cognitive Functions in People With Dementia

Evidence showed that both TENS and passive body heating are potential treatment strategies for improving cognitive functions in people with dementia. It is hypothesized that hat device (Wa...

STOP Persistent AF

To demonstrate safety and effectiveness of the Arctic Front Advance™ and Freezor MAX® Cardiac CryoAblation Catheters for the treatment of drug refractory recurrent symptomatic persisten...

Clinical Trial to Reduce Antibiotic Resistance in European Intensive Cares

Colonization of patients with Antimicrobial Resistant Bacteria (AMRB) like Methicillin Resistant Staphylococcus Aureus (MRSA), Vancomycin-Resistant Enterococcus (VRE) and Extended-Spectrum...

Probiotic Lactobacillus GG to Eliminate VRE Colonization

The use of LGG will be associated with elimination of VRE colonization. The primary comparison will be VRE elimination rates among those patients that receive LGG compared to those that r...

Prospective Study of Methicillin-Resistant Staphylococcus Aureus (MRSA) Among HIV-Infected Persons

This study will prospectively evaluate the prevalence and incidence (over a two year period) of MRSA colonization and infection among HIV-infected military beneficiaries to determine predi...

Medical and Biotech [MESH] Definitions

The Arctic Ocean and the lands in it and adjacent to it. It includes Point Barrow, Alaska, most of the Franklin District in Canada, two thirds of Greenland, Svalbard, Franz Josef Land, Lapland, Novaya Zemlya, and Northern Siberia. (Webster's New Geographical Dictionary, 1988, p66)

The sensation of cold, heat, coolness, and warmth.

The sensation of cold, heat, coolness, and warmth as detected by THERMORECEPTORS.

Subjective cutaneous sensations (e.g., cold, warmth, tingling, pressure, etc.) that are experienced spontaneously in the absence of stimulation.

The application of molecular biology to the answering of epidemiological questions. The examination of patterns of changes in DNA to implicate particular carcinogens and the use of molecular markers to predict which individuals are at highest risk for a disease are common examples.

Quick Search


DeepDyve research library

Relevant Topic

Bioinformatics
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...


Searches Linking to this Article