Transcript No Slide Title

Below Species Ranks
• subspecies - a population of several biotypes forming a
more or less distinct regional group of a species - primarily
a geographical race or ecotype
• variety - a population of one or several biotypes, forming
more or less distinct local groups of a species - primarily
local race, or ecotype of very small habitat - many people
feel this term shouldn't be used as it is too uncertain what it
means
• form - a population of one or several biotypes occurring
sporadically in a species population in one or several
distinct characters - a genetic variant mixed in with other
distinct genetic variants - may be variation in flower color
or secondary chemical compounds
• cultivar - a form or race of a plant found only under
cultivation
Pitcher Plant - Sarracenia rubra
subsp. gulfensis
Pitcher Plant - Sarracenia rubra
subsp. wherryi
Acer rubrum – Red Maple Aceraceae
Acer rubrum
var. rubrum
Acer rubrum
var. trilobum
Rosaceae
Peach
Prunus persica
var. persica
Nectarine
Prunus persica
var. nectarina
Violaceae
Two forms of Viola palustris – blue-runner violet
Solonaceae
Several cultivars of the tomato – Lycopersicon esculentum
Geology of Illinois
Garden of the Gods – Shawnee Hills
Apple River, Near Galena
Mississippi Palisades, Savannah, IL
Rockford, Illinois
Starved Rock State Park
Major cycles of variation in
temperature
Causes of 100,000 year cycle in
temperature variation
Earth
during
Wisconsinian
glaciation
Exposed glacial till
Glacial Drift at Fox River Stone Company –
St. Charles, IL – 100 feet of drift over bedrock
Illinois River Valley
Prairie pothole ponds and marshes
Glacial erratic in Alberta
Exposed Loess Deposit
Glacial Landscape – Cross-section
Mean Monthly Temperatures –
Urbana, Illinois
Cyclical climate and ecological
change at Billy’s Lake, MN
• 10,000 to 8020 BP - jack pine, red pine
forest with some oaks
• 8020 to 3400 BP - grassy prairies with sage
(5000 to 4000 BP) and with oak after that
• 3400 to 1000 BP - deciduous forest - oakgrass to oak-birch to birch-hornbeam
• 1000 BP to present - pine forest - birchwhite pine