Earth’s Axial Tilt Determines Forest Winners

The ancient giants are here and they rule their worlds. They are big and conquer their territory with power. They use so much that they choke out almost anything else. They make offspring that spread to make more giants. They become hundreds or even thousands of years old and can survive almost any natural calamities. They are of course, old growth trees. 

When visiting old growth forests most people look up to see and admire the majestic canopy that shades the floor. The umbrella could be either gymnosperm (pine) or angiosperm (leaf) or some mixture of these trees. Today’s post is a comparison of two climax forests that have developed in marshy wetland areas. The Corkscrew Swamp is in SW Florida (SWFL) and Maybury State Park is in SE Michigan (SEMI). I have resided in and explored both types of forested wetlands and we can see the similarities and differences in juxtaposition. 

At first look, some things were evident. The Michigan canopy is a result of the leafy foliage of angiosperm trees. There were pine trees in this forest but because of plant succession, the forest now is heavily populated with hard wood trees of hickory, four types of oak, iron wood, two types of maple, beech, birch  and a scattering of others. Among the 1000 acres of parkland there were only a handful of pine trees which were obviously intentionally planted as ornaments for the holiday season. 

The Floridian Corkscrew Preserve canopy is the result of needle foliage of gymnosperm trees of two types of Cyprus, slash pines mixed with some hardwood trees Red Maples, Live Oaks and Cabbage Palms and a few Royal Palms.

Another remarkable difference was the water flow. Corkscrew Preserve is 18 feet above MSL Maybury Park is 300 feet above MGLL. This is of minimal significance. Michigan is experiencing a drought. In this park area with the three creeks, some ponds and two lakes all are nearly devoid of water. What were swamps are now meadows. The soil was cool and dry. There has been little or no water inflow from creeks, springs, and no rain in two months. Weather forecast for Michigan shown no predictable relief from the drought conditions. The Florida swamp is seasonally relatively dry but it was still moist or boggy with a slow sheet water flow of the Everglades. The rainy season is just beginning. 

I searched for several plant and animal species. The ferns in the Corkscrew were abundant. There were no ferns in the Maybury Park. This was a real surprise because they were present 5 years ago. They are probably still present in the deep swamp in areas. Flowering plants in the Corkscrew Preserve were abundant and colorful and deserve another posting. The featured image is a wild hibiscus from Corkscrew Preserve, Florida. Flowers in the Maybury Park were herbaceous, minimal, and small. The most common were fleabane, thistle, and dandelion.

These two old growth forested areas are remarkably different. The differences arise from geographic position in latitude which alters the range of temperatures, the length of the day’s sun exposure, the period of below freezing temperatures. Corkscrew is a mature cyprus forest in the tropics at the 18^th parallel while Maybury is mature hardwood forest at the 44^th parallel. It is only 22 degrees south of the artic polar circle. Longitudinally they nearly identical. The rotation of the earth on its axis results in two very different climates. Because of the axis of rotation of the Earth, SEMI can experience wide ranges of temperature varying in a high to low range of 125^o F with months of sub-freezing temperatures. The range of high to low temperatures in SWFL is closer to 50^o F with no freezing temperatures. These climatic changes result in vastly different biologizes. The summer temperatures are nearly identical with hot sultry weather. For two weeks around the 4th of July, the daily high temperature in SEMI can be higher than Florida with over 100^O F . 

The solar rotation of the earth and the 23.5 degree off axis tilt of the rotation of the earth results in these two very different climates. Michigan daylight hours at the summer solstice are two hours longer than Florida and at the winter solstice two hours shorter than Florida. At the 44th parallel summer solstice days are 6 hours longer than the winter days six months later. The prolific mid-summer biologic activity of the Michigan forests must compensate for the 5 months of cold weather where there is very limited or no metabolic activity. The broad leaves of the angiosperm tree leaves must manufacture all the products of growth, reproduction, and metabolism. The Floridian forest metabolism simply continues all year long. 

The giant trees are the winners because they grow taller than all others, collect more energy by photosynthesis from the sun, store energy when the light is not available and produce more seeds for reproduction. There are alternatives to big tree success. These are the dwellers in the dark. A more extensive discussion regarding fern spore production in Corkscrew Preserve will follow. 

The Floridian ecosystem has the potential for more diverse life forms. It favors plants and animals that prefer a more stability in weather and climate. Michigan ecosystems favor a tougher collection of plants and animals which can be prolific in summer climate and store reserves for surviving deep winter climate.  It is very understandable to see the survival value in animal migration. Many of the animals follow the cyclical greening of America from Michigan to Florida in the winter and the reverse in the summer.

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#solstice #tilt of earth #wetland #Corkscrew #Maybury #photosynthesis #trees #angiosperm #gymnosperm #water #light