Understanding Energy Flow and Matter Cycles in Ecosystems
1. Energy Flow in Ecosystems In ecosystems, energy is transferred from one organism to another through trophic relationships. Flow of Energy is a unidirectional process. Ecosystems depend on a continuous power supply for energy functioning. The energy that enters an ecosystem comes from producers that use a small amount of light energy. This energy is called solar energy, which is used to perform the process of photosynthesis. Producers convert light energy into chemical energy. The part of the energy that is stored in organic matter can be transferred to the next trophic level. Cycle of Matter is a cyclic process. Matter is about both living organisms and the environment, including the atmosphere, water, and soil, throughout the terrestrial ecosystem. Matter is recycled constantly. Producers use inorganic substances and convert them into organic matter.
2. Biomass is the amount of organic matter accumulated in an individual, trophic level, or ecosystem population. It is measured in kilograms or grams per surface area or volume. Production refers to the amount of energy stored as biomass at each trophic level per unit of time. As a function of trophic level, primary production is the quantity of energy captured in an ecosystem through photosynthesis, while secondary production is the energy captured by consumers through feeding. Within production, we differentiate between total biomass generated and the total amount of biomass available for the next trophic level. Productivity expresses the efficiency of a trophic level, relating its production to biomass, which will be greater the lower the loss of biomass between trophic levels.
3. Natural Changes in Ecosystems Ecosystems are dynamic structures that vary over time. All ecosystems tend to reach a state of equilibrium or stability, despite small changes that occur. Conditions: Environmental factors must remain stable. The number of individuals in populations should remain relatively constant. There must be no external factors that alter the ecosystem. Depending on the origin of the change, it can be: Natural changes result from the internal dynamics of the ecosystem, while Artificial changes are due to anthropogenic activities. Depending on the duration of changes, they can be gradual, occurring slowly over long periods, or catastrophic, happening quickly in a short period. Natural changes affecting biocenosis can occur over hundreds of years, while changes due to human action can happen in a shorter timeframe. Global Change refers to abrupt changes in the environment that affect the entire planet, such as glacial periods that covered large tracts of land. Rhythmic Changes in Ecosystems produce cyclical and predictable changes that can be directly observed. These changes are due to the dynamics of the Earth, sun, and moon, including the alternation of day and night. In all ecosystems, photosynthesis dominates during the day, while respiration occurs at night. Terrestrial animals can be active during the day or night. Seasonal Changes affect all ecosystems, especially those in temperate zones, where cyclic changes occur throughout the year.
4. Ecological Succession is the sequence of changes that occur in an ecosystem as a result of its own dynamics. It is a slow and gradual process, leading to a progressive evolution of the ecosystem from an initial state of low biological diversity to a final state of greater diversity. General Changes in a Sequence include increases in species diversity, structural complexity, biomass, and energy efficiency, while decreasing the loss of productivity in the ecosystem. Climax Stability is the ideal state of an ecosystem at the end of a succession process. Primary Succession occurs in an area that has not been previously colonized, while Secondary Succession occurs in an area where a community has been partially or entirely eliminated due to disturbance.
5. Pests and Their Control Pests can be managed with various chemical products called pesticides. In agriculture, pesticides are used to control insects, herbicides eliminate weeds, and fungicides prevent mold growth in the soil. Notable Benefits of Pesticides: Improving crop yield, controlling certain epidemics, and resistance to pests. However, they can also lead to environmental pollution, high persistence in the environment, and bioaccumulation. Biological Control involves using living organisms or specific predators to regulate pest populations, reducing them to very low densities. This method is slower than chemical control but allows for more precise management through careful study of population dynamics.