Ecosystem Dynamics and Biological Interactions

Ecosystem Components and Biological Organization

An ecosystem is a natural system consisting of living and nonliving components that interrelate. It has two main components: the biotope, which is the physical medium inhabited by different species, and the biocenosis, which refers to the living beings inhabiting the biotope.

Organization of the Living Environment

• Biosphere: Covers the Earth's surface and the living beings inhabiting the atmosphere, continents, and water.
• Biome: Covers large parts of the biosphere, characterized by the species inhabiting it, such as forests or deserts.
• Ecosystem: A natural unit within a biome where species interact with their environment.
• Microecosystem: A part of the ecosystem where specific entities inhabit, such as tree bark.

Ecosystem Factors

• Abiotic Factors: These are all variables that characterize the biotope and allow life for those adapted to it. These include geography, environmental factors, soil, and chemical factors such as light and humidity.
• Biotic Factors: These are the living things that live in that ecosystem and the relations established between them, including communities and populations.

Intraspecific Associations

These involve individuals of the same species that inhabit together to improve their defense and food search.

• Colonial
• State
• Gregarious

Interspecific Associations

These are direct matches established between individuals of different species that compete for the same food or feed on one another.

• Competition
• Parasitism
• Predation

Additional Interspecific Associations

Direct matches established between individuals of different species where they compete for the same food or feed on one another. These interactions can benefit one or both parties mutually:

• Commensalism
• Symbiosis
• Inquilinism

Trophic Food and Energy Relations

Trophic Levels of the Ecosystem

• Producers: Autotrophs (plants and phytoplankton) that capture solar energy and utilize it through photosynthesis to convert inorganic matter into organic matter.
• Consumers: Heterotrophs (animals) that obtain matter and energy by feeding on plants and animals.
  • Primary Consumers: Herbivores that feed on producers.
  • Secondary Consumers: Carnivores that feed on primary consumers.
  • Tertiary Consumers: Feed on secondary consumers.
• Decomposers: Bacteria and fungi that decompose organic and inorganic debris (corpses, excrement) from other living beings and transform them into useful material for producers.