¿Qué es un ECOSISTEMA? Tipos, componentes y ejemplos🏞️🌊🏜️

Ecosystems: Components, Types, and Examples

Key Concepts:

• Ecosystem: A delimited area where living (biotic) and non-living (abiotic) components interact, exchanging matter and energy.
• Biome: A large geographical area encompassing several ecosystems.
• Abiotic Components: Non-living elements of an ecosystem (e.g., water, air, soil, rocks, solar radiation, climate).
• Biotic Components: Living organisms within an ecosystem (e.g., bacteria, archaea, fungi, plants, animals).
• Terrestrial Ecosystems: Ecosystems where interactions occur on or within land.
• Aquatic Ecosystems: Ecosystems where interactions occur in liquid water (marine or freshwater).
• Mixed Ecosystems: Ecosystems combining terrestrial and aquatic environments.
• Anthropic Ecosystems: Ecosystems significantly influenced by human activity.

1. Defining Ecosystems and Their Components

• An ecosystem is a defined area where biotic and abiotic components interact, exchanging matter and energy.
• The definition of an ecosystem's boundaries is determined by the observer's interest. A forest can be an ecosystem, and a pond within that forest can also be considered an ecosystem.
• Biomes are larger geographical areas that contain multiple ecosystems.
• Abiotic components are non-living elements like water, air, soil, rocks, solar radiation, climate, and human-made artifacts or waste.
• Biotic components are all living organisms, including bacteria, archaea, fungi, plants, and animals.

2. Types of Ecosystems

Ecosystems are classified into four main types: terrestrial, aquatic, mixed, and anthropic.

2.1 Terrestrial Ecosystems

• Terrestrial ecosystems are defined by interactions occurring on or within land.
• The type of vegetation, determined by environmental conditions, primarily defines these ecosystems.
• Examples include jungles, forests, savannas, deserts, and semi-deserts.
  • Jungles and Forests: Dominated by trees, where abiotic factors like water, temperature, and soil fertility support tree growth. Trees, in turn, affect abiotic factors by conserving moisture, regulating temperature, and increasing soil fertility through organic matter. Tropical rainforests represent the highest level of complexity.
  • Savannas: Dominated by grasses due to soil conditions that limit tree growth. A key interaction is between grasses, large herbivores, and carnivores.
  • Deserts and Semi-Deserts: Characterized by scarce vegetation and life due to harsh abiotic conditions (e.g., lack of water, extreme temperatures). The Sahara Desert, for example, is primarily sand and rocks with limited biotic components like reptiles, insects, and few mammals.
  • Soil: Can be considered a specific terrestrial ecosystem with abiotic components (minerals, rock fragments, water) and biotic components (plant roots, bacteria, fungi, earthworms, burrowing animals).

2.2 Aquatic Ecosystems

• Aquatic ecosystems are defined by interactions occurring in liquid water.
• Subdivided into marine (saltwater) and freshwater ecosystems. Freshwater ecosystems are further divided into lentic (lakes, ponds) and lotic (rivers).
  • Marine Ecosystems: Saltwater is the primary abiotic component. Diverse ecosystems exist due to variations in salinity, pH, and temperature, including coastal ecosystems, coral reefs, open sea ecosystems, and hydrothermal vents. The biotic component includes plankton, fish, crustaceans, molluscs, and marine mammals like the blue whale (Balaenoptera musculus).
  • Hydrothermal Vents: Located at depths exceeding 2,000m, these vents release hot water and gases (fumaroles), serving as an energy source for unique life forms.
  • Freshwater Ecosystems: Develop in water with low mineral salt content. Rivers are lotic ecosystems (running water), while lakes, lagoons, ponds, and cenotes are lentic ecosystems (still water). Abiotic components in rivers include current speed, relief, water composition, temperature, and dissolved oxygen. The biotic component is dominated by aquatic life, including fish, crustaceans, molluscs, algae, and some marine mammals.

2.3 Mixed Ecosystems

• Mixed ecosystems combine terrestrial and aquatic environments, often involving the aerial environment.
• Organisms adapt to interact between these environments.
• These ecosystems can be temporary or periodic, such as flooded savannas or the várzea forest in the Amazon.
• Examples include seabird habitats, mangroves, and wetlands.
  • Mangroves: Coastal forests that grow between terrestrial and marine environments. Trees are adapted to grow on land or with roots submerged in the sea. Species include the red mangrove (Rhizophora mangle), black mangrove (Avicennia germinans), and buttonwood mangrove (Conocarpus erectus). The fauna includes marine, amphibian, and terrestrial organisms like fish, starfish, turtles, crabs, aquatic and terrestrial mammals, and seabirds. Abiotic components include soil, fresh and salt water, and gradients of salinity, temperature, and humidity.
  • Wetlands: Floodplains with permanent or temporary water cover, fostering mixed ecosystems. Examples include flooded savannas in South America (Pantanal in Brazil), and flooded forests in the Amazon and Congo basins.

2.4 Anthropic Ecosystems

• Anthropic ecosystems are characterized by human control over matter and energy flow.
• While natural abiotic factors are present, they are largely manipulated by humans.
• Examples include farms and urban ecosystems.

3. Examples of Real Ecosystems

3.1 Cloud Forest

• A terrestrial ecosystem with complex biotic and abiotic interactions.
• High biodiversity with complex food webs. Trees are primary producers, along with epiphytes, climbing herbs, and shrubs. Herbivores range from insects to primates and sloths, which are preyed upon by carnivores like praying mantises and jaguars. Decomposers recycle organic matter on the forest floor.
• Organisms depend on and influence abiotic components like humidity, temperature, and water availability.

3.2 Coral Reef

• The most diverse and productive marine ecosystem.
• Coral polyps are the central biotic component, forming the reef structure that supports other aquatic organisms.
• Depends on a balance of abiotic components like salinity, water acidity, solar radiation, and temperature. Occurs in waters less than 200m deep with temperatures above 20°C.

3.3 Selva de Várzea (Flooded Forest)

• A mixed ecosystem within the Amazon basin's tropical rainforest biome.
• Periodically flooded lowland forest, functioning as a terrestrial ecosystem for part of the year and an aquatic ecosystem for the remainder.
• Biotic components include terrestrial organisms like jaguars and tapirs (good swimmers), and aquatic organisms like manatees (river dolphins), fish, and alligators that move into the forest during floods.

4. Synthesis/Conclusion

Ecosystems are complex, interconnected systems where living and non-living components interact. They can be classified based on their primary environment (terrestrial, aquatic, mixed) or the degree of human influence (anthropic). Understanding the components and dynamics of different ecosystems is crucial for comprehending the natural world and addressing environmental challenges. The examples provided (cloud forest, coral reef, várzea) illustrate the diversity and complexity of these systems, highlighting the intricate relationships between biotic and abiotic factors.