Subject of microecology and distribution of microbes
The focus of microbial ecology centers on two main vectors of interaction. First, these are contacts between various microorganisms among themselves within a single community. Second, this is the interaction of microbes with the environment in which they exist.
The most important characteristic of the microworld is its ubiquity. This means that microorganisms are distributed absolutely everywhere. They can be found in soil of any depth, in bodies of water of various salinity and temperature, in the air, as well as on the surface and inside other living organisms. Surprisingly, microbes are even capable of surviving in the extreme conditions of open space.
Basic ecological concepts
To accurately describe the position and role of microorganisms in nature, researchers use a strict hierarchy of categories:
- Biotope. This is a specific part of the habitat (it can be a fragment of land or a body of water) characterized by completely uniform conditions for the life of organisms.
- Biocenosis. This is the global totality of absolutely all living creatures that inhabit a given biotope. Biocenosis includes animals, plants, and, of course, microorganisms.
- Microbiocenosis. A specific term denoting a community consisting exclusively of microorganisms that inhabit strictly defined areas of the external environment or the host organism.
Global role of microorganisms in nature
Microorganisms perform functions without which the maintenance of life on Earth would be impossible. Their influence affects both global processes on a planetary scale and specific medical aspects.
Key functions of microbes:
- Nutrient cycling. Microorganisms take an active part in the continuous circulation of essential chemical elements in nature.
- Sanitary function. Due to the destruction (breakdown) of the remains of dead plants and animals, microbes cleanse the planet of organic debris.
- Soil fertility enhancement. The activity of microorganisms directly affects the improvement of soil quality.
- Biosphere homeostasis. The vital activity of the microworld ensures the maintenance of a stable and reliable balance in all existing ecosystems.
- Medical aspect. Within the human body (macroorganism), microbes form the normal microflora. As part of this microflora, they perform many beneficial and protective functions that are critical to health.
Briefly: answers to topical questions
What is the difference between a biotope and a biocenosis?
Biotope and biocenosis differ in that the first concept denotes the non-living habitat, while the second denotes the totality of living organisms inhabiting it.
| Characteristic | Biotope | Biocenosis |
|---|---|---|
| Definition | An area of the environment (land or water body, territory) with uniform abiotic conditions of life | The totality of all living organisms (animals, plants, and microorganisms) inhabiting a specific biotope |
| Role in the ecosystem | Habitat (abiotic components) | Community of organisms (biotic components) |
Together, the biotope and biocenosis form a single ecosystem (biogeocenosis) within which they are inextricably linked by the cycling of substances and the flow of energy.
What is the significance of normal microflora for the human body?
Normal microflora is vital for humans, as it performs a number of beneficial functions for the macroorganism and largely determines its state of health.
Main functions of normal microflora:
- Environmental regulation — maintaining optimal pH.
- Physiological support — assisting in the physiological functions of tissues and organs.
- Metabolism — participating in metabolic processes.
Most microorganisms are commensals and exist in a state of eubiosis with the host organism. The destruction of normal flora leads to dysbiosis and severe consequences. However, with a sharp decrease in defensive forces (for example, during radiation injury), activation of the normal microflora is possible with the risk of developing bacteremia and septicemia.
To remember the difference between the basic terms, imagine a matryoshka doll: Biotope (place) → Biocenosis (all living inhabitants of this place) → Microbiocenosis (only invisible microbes in this place).
Class and exam questions
What does the term "ubiquity" mean in relation to microbes?
Ubiquity means widespread distribution. Microbes are found everywhere: in water, air, soil, on living creatures, and even in space conditions.
What is the difference between biocenosis and microbiocenosis?
Biocenosis includes generally all living organisms (plants, animals, microbes) in a certain area. Microbiocenosis describes a community consisting only of microorganisms.
What role do microorganisms play in the planet's sanitation?
They carry out destruction, i.e., the complete breakdown and processing of the remains of dead animals and plants, cleansing the environment.
What else to study on this topic
- Types of interactions between microorganisms
- Mechanisms of microbial participation in the cycling of chemical elements
- Interaction of opportunistic and transient microflora with normal microflora
- Composition and functions of the human normal microflora
Study the full topic in the «Microbiology» course
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