Optimal black spruce seed sources for anticipated future climates
Abstract
Climate change is occurring at an increasingly rapid pace. Many tree species,
even those with wide seed dispersal and high genetic variability, are long-lived
and unable to “keep pace” with these shifting climates. The combination of the
longevity of trees and human-caused fragmentation of habitat makes it unlikely
that these species will adapt on their own. Therefore, local seed sources, though
once adapted to local conditions, will no longer be the optimal seed source and
will decline in health and rate of growth. Instead, seeds adapted to areas with
temperature and precipitation conditions typically seen in more southern sources
and lower latitudes will be the best solution. This thesis explores the importance
of considering climate shift when selecting seed sources for regeneration. A
study of data from provenance tests with various Ontario seed sources was
conducted to identify the optimal growing conditions for each seed source. It
was found that, in most cases, optimal growth occurred for sources originating
from lower latitude. This growth implies to replant harvested forests that are
ideally suited for climatic variables present at that site, seeds should be sourced
from these “more suitable” locations.
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