Talk given to the annual meeting, Friends of Madrona Marsh, 2016. Talk covers likely effects of climate change on western Los Angeles County Nature Preserves and gardens.
36. Subtle changes in temperature can effect sensitive
systems – in plants and in the climate/environment
Global/local temperatures (including ocean temperatures) affect:
Precipitation: amount, timing and type
Winds: patterns, timing, velocity
Humidity: degree, timing
Soil conditions: moisture, organisms
Everything is interconnected
69. Plant disease
changing
In both animals and plants, an unprecedented number of fungal and
fungal- like diseases have recently caused some of the most severe
die-offs and extinctions ever witnessed in wild species, and are
jeopardizing food security.
Consequences for local Preserves and gardens:
More severe effects of old pests (plants are less able to cope)
New pests adapted to the changing climate: temperature & precipitation
The past two decades have
seen an increasing number of
virulent infectious diseases in
natural populations and
managed landscapes.
71. Temperature is one of the most important
influences on plant distribution
72. Temperature and rainfall limit plant
distributions in S. CA as well
Air temperature decreases
with increasing elevation
Air temperature gradients
can explain the distribution
of C3 (cool-season) and C4
(warm-season) grasses and
many other types of plants
Precipitation interacts with
temperature in limiting
species distributions
Plant species are already ‘marching up the mountains’ all
around the world