Yes, but slowly, approximately 100 yards per year according to npr.org.
Migration Rates
Migration rates following the last ice age are estimated at a pace of around 100 yards per year.
Paleoecology
Paleoecology is the study of the distribution and abundance of ancient organisms and their relationship to the environment.
It involves the reconstruction of plant species during glaciation by examining the pollen in soil cores.
Pollen Analysis Process
Pollen Production: Pollen is produced by plants.
Transport: Pollen is transported via wind and other means.
Mixing: Pollen mixes with mud and accumulates in layers.
Preservation: Pollen is preserved in sediment layers.
Collection: Scientists collect core samples from sediment.
Preparation: Samples are prepared for analysis.
Identification and Counting: Pollen types are identified and counted.
Interpretation: Data is used to reconstruct past vegetation and climate.
Diagram: Diagrams are drawn to represent vegetation.
Reconstructed Vegetation: Vegetation is reconstructed based on pollen data.
Climate Data: Climate data are derived from other sources.
Landform: Landform also informs the analysis.
Pollen Record
Picea: Spruce
Juniperus/Thuja type: Juniper/Thuja type
Quercus: Oak
Tsuga: Hemlock
Castanea: Chestnut
Carya: Hickory
Juglans nigra: Black Walnut
Total Pinus: Total Pine
Poaceae: Grasses
Pteridium aquilinum: Bracken Fern
Ambrosia type: Ragweed
Iva: Marsh Elder
Helianthus type: Sunflower
Chenopodium type: Goosefoot
Plantago: Plantain
Rumex: Dock
CHAR cross-sectional area: Charcoal measurements indicate fire history, measured in mm^2 cyr^{-1}.
Laurentide Ice Sheet (LIS)
The map shows the maximum extent of the Laurentide Ice Sheet (LIS) during the last glacial period. The LIS covered a large portion of North America.
Anderson Pond, TN Profile
Pollen data from Anderson Pond, Tennessee, is used to reconstruct past vegetation.
Around 20,000 years ago, pine and spruce dominated the landscape.
Oak dominance began approximately 16,000 years ago as the glaciers retreated.
Spruce Distribution
Spruce distribution 21,000 years Before Present (BP).
Spruce distribution Modern.
Climate Change and Tree Migration
Trees may need to migrate at a rate 100 times faster than previously documented to keep pace with shifting climate.
Tree species are expected to experience lags in their response to changing climate.
Assisted Migration
Assisted migration: the human-aided relocation of species.
It involves moving species within or beyond their historical range to conserve species and facilitate adaptation to predicted climate change.
Tree Migration Mechanisms
Trees migrate in response to changing climate.
They disperse their seeds (sexual reproduction) or grow vegetatively (asexual reproduction).
Regeneration Ecology
The volumetric landscape ecosystem supports the plant life cycle with trees shown as repeating modular units.
Phases of Regeneration:
I: Seed bank in the forest floor.
II: Establishment and recruitment of seedlings into the understory.
III: Growth in height, mass, and number of modular units; vertical bars represent environmental constraints on growth; dashed line indicates the influence of the overstory on establishment and recruitment.
IV: Seed production and dispersal.
Life History
Life history: an organism’s lifetime pattern of growth, development, and reproduction.
Plants establish and then either die or undergo a process of recruitment where certain individuals in the ground-layer reach the understory, and then even fewer are recruited into the canopy.
Factors Affecting Seedling Establishment
Seed production includes flower bud differentiation and flowering, pollen dispersal and pollination, seed formation, and abscission.
Seed dispersal involves primary dispersal (by wind, collisions with canopy, or ground) and secondary dispersal.
Seedling establishment involves germination and seedling growth.
Key factors include temperature, rainfall, wind, solar radiation, seed/seedling predation, seedling density, climate, forest management practices, canopy structure, and topography and ground vegetation.