Lesson 1

At One Time, the Longleaf Pine Ecosystem Stretched Nearly Continuous from Eastern Texas to Southern Virginia...

 

Student Information:

When early Europeans first explored the southeastern United States, they found a forest of longleaf pine trees covering about 90 million acres (about the area that 90 million football fields would cover).  These forests were seen in nine states, with Georgia, Alabama, and Florida having had the most longleaf pine.  With the exception of occasional rivers, swamps and Indian farms, this forest stretched as far the eye could see.  Today about 97% of this forest has been destroyed.

 

Teacher Information:

At one time, longleaf pine forests were perhaps the largest forest type in North America dominated by a single species of tree.  Prior to the settlement of the south by Europeans, forests comprised predominantly of longleaf pine trees ranged over about 90 million acres of the southeastern United States.  This ecosystem could be found in a variety of habitats from rolling sandhills in North Carolina and South Carolina to 3000 ft tall mountains in North Georgia and Alabama to the flatwoods in Mississippi, Texas and Florida.  Where there was fire, there was longleaf pine.  In general longleaf pines were found in the drier sites because they burned more frequently.  In wetter sites longleaf pine forests would subtlety grade in other habitat types like cypress ponds or hardwood river corridors (because fire would not travel into these areas very often).

These frequent fires created an ecosystem that is as rich in biological diversity (biodiversity) as some tropical rainforests.  However, unlike the rainforest, most of the diversity was not found by looking up, but instead by looking at down at the ground.  In an area no bigger than the size of a hula-hoop, up to 40 different types of plants could be found in the groundcover.
Because the longleaf pine ecosystem covered such a large area and frequent fires were requisite to its existence, one can easily imagine how fire behaved across the landscape up until the last 150 years or so (prior to significant Euro-American settlement).  Without the presence of roads, urban areas, open fields, etc. fire would have moved freely across the terrain, fingering its way across enormous areas.  When the fire ran into rivers, streams, or the occasional Indian village or when weather conditions changed such that combustion could no longer be sustained, the fire would stop and either extinguish or smolder and (later) ignite again.
Today, longleaf pine forests can still be found in every state of its original range except Virginia (where there are only a few dozen trees remaining).  However, only around 3 million acres of this (once immense) longleaf pine forests remains today.  A species decline has closely followed the loss of this forest type.  Today many species of plants, animals and even insects that require longleaf pine forests are either threatened or endangered with global extinction.  If more is not done to help protect and restore the longleaf pine forests, we can expect its demise in the next few generations.

 

Key Words and Concepts:

Acre:  A unit of measure used to describe large areas, equal to 43,560 square feet.  A square acre would be approximately 209 feet by 209 feet and a circular acre would have a radius of 117.75 feet.  Visually, one acre is about the size of a football field.

Biodiversity:  The number of different plant, animal and insect species found within a particular area.  Longleaf forests have high biodiversity.  This diversity, however, is often found not by looking up to the tree canopy but by looking down at your feet.  Most of the diversity of this forest is found mostly on the forest floor.  Fire helps to maintain this high biodiversity.

Ecosystem:  Plant and animal communities, their environment, and the resulting interactions. An ecosystem can be as simple as a mud puddle or dead log or as complex as a forest containing thousands of acres.

Endangered:  A plant, animal or insect that is in imminent danger of extinction.  Can be federally endangered (in peril of global extinction) like the red-cockaded woodpecker or American chaffseed plant or state endangered (in peril of extinction from a region) such as the gopher tortoise in Mississippi.

Extinction:  Ceasing to exist.  Extinct species will never reappear on the earth.  It can also be referred as globally extinct.  Longleaf forest examples include:  passenger pigeons, Carolina parakeet, and possibly the Bachman's warbler and ivory-billed woodpecker.

Groundcover:  A generic term used to describe the mat of plants found on the forest floor.  In longleaf pine forests, this groundcover is usually dominated by a species of grass like wiregrass or split-beard bluestem.

Habitat:  An animal's environment (where it lives).  This area must supply all of the animal's life needs.

Range:  An area where a species can naturally occur.  Range can be limited by geography, climate, soils, elevation, aspect, etc.  Also can be used to describe areas where livestock are grazed.  May also be used to describe a collection of mountain peaks such as those found in north Georgia and Alabama where longleaf pine once thrived.

Species Decline:  A reduction in the actual numbers of a species.  Usually this decline is a result of a reduction in the area occupied by species.

Threatened:  A species that is one step from becoming an endangered species.  Although threatened and endangered species are given protection in the United States through the Endangered Species Act, threatened species are considered to be at less risk of extinction than endangered species.

Suggested Activities:

Correlations to Course of Study coming soon!