 Terrestrial Ecology specifies the relations of organisms and their physical environment on land. Terrestrial Ecology can be further defined through categorization of terrestrial biomes and terrestrial ecosystems.

Terrestrial Ecosystems vs Terrestrial Biomes

Terrestrial ecosystems and terrestrial biomes are different from each other. Terrestrial ecosystems can be defined as a community of interaction between many living organisms and nonliving things on land. Terrestrial Biomes can be defined as an area, on land, that can be classified by the animals and plants that live within it. In some cases, there can be a few different ecosystems within a terrestrial biome. This means that biomes are on a larger geographical scale than ecosystems and biomes directly affect or make up the interactions within an ecosystem and the organisms within it.

Tundra: Low temperatures and short growing season, which makes for a less productive ecosystem.

Grassland: Hot summers and cold winters, precipitation plays a vital role in the productivity within this biome.

Desert: Great variability due to the different types of deserts. Low precipitation and productivity solely depends upon the type of desert.

Savanna: Long dry seasons and low amounts of rainfall. Typically are productive due to adaptations of communities. (Ex: Serengeti Plain in Africa)

Tropical: Warm and lots of rainfall. High productivity due to ideal climate conditions and rich soil.

Taiga: Commonly known as Coniferous forests. Long, cold winters and short, cool summers. Productivity is dependent on the season.

Chaparral: Wet winters and dry summers. Low productivity due to long dry summers and low quality in soil. (ex: Mediterranean climate)

Temperate Deciduous Forest: Cool winters and warm summers. Year round precipitation makes for a high productivity.

Polar: Extremely cold temperatures, so cold, the climate averages zero degrees Celsius year-round. Low productivity due to extremely low temperatures.

Factors of Terrestrial Ecosystems

Terrestrial ecosystems can be categorized through biotic and abiotic factors . Biotic factors or biological factors are the autotrophs, heterotrophs, and detrivores of a particular ecosystem. You may remember these as producers or autotrophs, consumers or heterotrophs, and decomposers or detrivores. These biotic factors evidence the differentiation in ecosystems and biomes, for example and in most cases, an autotroph that typically lives in a cold, wet climate would not be able to survive in a hot, dry climate such as a desert or savanna. Abiotic factors are physical components to a biome and these components affect the biological diversity and factors of the biome. In short, abiotic factors directly affect biotic factors. Abiotic factors are the unique aspects to a particular climate, the type of soil in the region, and the usage of the land.

Autotrophs

Autotrophs are organisms that create their own food by converting inorganic compounds into organic compounds. They are primary producers because they reside at the base of the food chain pyramid. There are two types of Autotrophs, Chemoautotrophs and Photoautotrophs.

Chemoautotrophs are bacteria that create energy with the chemical energy within inorganic compounds. This proccess occurs through "chemosynthesis" or the creation of organic compounds by bacteria and these bacteria use energy from chemical reactions that occur without sunlight. They use inorganic compounds like Carbon Dioxide to create sugars. For example, "Sulfur Reducers" are chemoautotrophs and they use inorganic sulfur compounds as a source of energy. Sulfur reducers can be found in locations that release sulfur such as near vents and active volcanoes on the ocean floor. Chemoautotrophs are said to be mainly found within the ocean and in the intestines of animals.

Photoautotrophs are plants and bacteria that contain "chloroplasts" and chloroplasts are able to create energy by converting energy from photons into chemical energy in sugars or other molecules. This occurs in process of photosynthesis. Photoautotrophs play a vital role in terrestrial ecosystems because they are a major provider in energy or food to animals. Plants or photoautotrophs are the primary or base within a food chain pyramid. However there are factors that make each ecosystem unique, so primary or base photoautotrophs will be different within different ecosystems.

Autotrophs can be differentiated by the type of energy they use. Chemoautotrophs use chemical energy and Photoautotrophs use light energy.

Heterotrophs

Heterotrophs are living organisms that gain energy and nutrition through consuming other organisms. The organisms form cells and body parts by using nutrients as "building blocks." Animals and most microorganisms are heterotrophs that can be classified by the organisms they consume. Heterotrophs are secondary and tertiary consumers.

Herbivore: Organisms that eat plants

Example: Deer, Rabbits

Carnivore: Organisms that eat animals

Example: Wolves, Lions

Omnivore: Organisms that eat both plant and animals

Example: Bears, Humans

Detrivores or decomposers that break down plants or animals can also be considered heterotrophic.

Detrivores

Detrivores, also known as "decomposers," are organisms who feed on dead plant and animal material and also feed on waste. Detrivores break down and partly digest organic material. This feeding process aids in the maintenance of nutrient cycling and restoration of rich soil. An example of a detrivore are "protozoa," a single celled organism. Protozoa are similar to animals in that they look for other microorganisms to eat.

Nutrient Cycling is also known as"Ecological Cycling" and this refers to the processes of recycling resources that sustain all life on Earth such as carbon, nitrogen, water and etc. For example, one of the most vital roles within nutrient cycling in terrestrial ecosystems are the role of Mycorrhizal fungi.

Mycorrhizal fungi release and distribute nitrogen and phosphorus from dead plant material. This release of nitrogen and phosphorus from mycorrhizal fungi are the primary source within terrestrial ecosystems and in the uptake in these nutrients within plants of these ecosystems. Mycorrhizal relationships also offer defense against insects and other organisms that may be looking for a source of nutrients.

Putting It All Together

Biome: Grasslands/Wetlands

Type of Ecosystem: Swamps and Marshes

Type of Swamp and Marsh: Freshwater

Climate: Warm and humid summers.

Freshwater swamps and Marshes are the most productive ecosystems on land. The lower elevation and warm, humid climate creates an ecosystem that is very productive in the simultaneous relationship between biotic and abiotic factors. Marshes resupply groundwater and they manage the flow of water to streams. Marshes play a vital role near "watersheds" by reducing the amount of damage from flooding and this is done through the storing of excess water. Marshes regulate extra sediments and pollutants through decomposition and nutrient cycling. Microorganisms and vegetation feed on the excess nutrients provided by the extra sediments and pollutants such as nitrogen or phosphorous from fertilizers, a very relevant challenge within pollution in agriculture. There is a great diversity of flora and fauna or plants and animals within wetlands. Flora and fauna are the biotic factors within ecosystems or the autotrophs and heterotrophs. The abiotic factors like the humid climate, overly saturated soil, and excess water directly affect the flora and fauna within swamps and marshes. The great biodiversity within swamps and marshes and the abiotic factors make it an ideal ecosystem for productivity. Specifically, freshwater marshes, show the greatest efficiency and productivity for nutrient cycling and converting of resources than any other ecosystem. Detrivores play a vital role in the nutrient cycling and carbon distribution within a freshwater marsh. Ascomycetes and Basidiomycetes, are most common within fresh water marshes, these detrivores convert a large amount of plant litter or "detritus" into Carbon Dioxide and nitrogen as a result of respiration and nitrogen fixing. Respiration occurs at a more productive rate within wet climates opposed to dry climates. When the fungi develop mycorrhizal relationships with plants, in an ecosystem that is humid and has excess water in the soil, the plants and fungus in theory would be working at a greater level of productivity. With more active plants, come higher levels of nutrients and for herbivores, this can create a competitive ecosystem for both space and nutrients. Many insects live in swamps and marshes and many feed on plants. The mycorrhizal relationships within swamps and marshes are great for nutrient cycling and defense against these insects.

References

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Terrestrial ecology

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