Biology Community Definition, Concept, Structure

After reading this article you will learn about definition of biology community, concept of community, structure of community, and community dynamics.

Definition of Community

In general, the term “community” refers to the population of all species present in a given region at a given moment. Changes in the environment may be tolerated by the populace, at least up to a point. Most scientists agree that biological evolution the gradual alteration of a population’s genetic makeup through time is the primary mechanism by which organisms adapt to new environments.

Biology Community Definition

Concept of Community

A population is a collection of creatures. Different populations have different natality rates, mortality rates, age structures, growth rates, and so forth. However, a biotic community, or just a community, is formed when many populations share a habitat and its resources.

Populations of microbes, plants, and animals that live in the same area and interact with one another are said to be part of a biotic community. In each given ecosystem, the make-up of the biotic community is determined by the ecological range of the species present and the dominance of certain environmental conditions.

So, the sort of community that thrives and grows in a given environment is determined by its climate and other abiotic and biotic conditions. Trophic (feeding) interactions exist between the organisms in a community. They may have reproductive and behavioural interactions because of their close proximity.

Multiple features, including species richness, population density, dominant species, community composition, and stratification, are present in every biotic community. Each area is restricted in its own unique way. The dividing line between two neighbourhoods might be either a hard line or a soft one.

Eco-tone refers to the boundary or meeting point of ecologically distinct groups. There is a population of creatures that live in the eco-tone, and they are part of a larger community known as the eco-tonal com­munity.

Structure of Community

Communities may be either very small, with a few of species concentrated in a tiny region, or relatively big, with many species dispersed across a wide swath of land. All one has to do is look around to get a good sense of the layout, population makeup, and other salient features of a community.

This method is qualitative and so simpler than the more rigorous quantitative population study that involves taking real measurements. Ecologists categorise communities in a variety of ways, but most of these categories are based on the presence or absence of certain habitat characteristics, such as water, high exposure, or other habitat characteristics.

Plant communities, for example, may be classified as hydrophytic (found in watery environments), mesophytic (found in moderately wet soil environments), or xerophytic (found in desert environments) based on the quantity of water available (dry or arid habitat).

Likewise, heliophytic communities are those that thrive in bright light, whereas sciophytic populations prefer cooler temperatures and more shadow. Identically communities grow­ing on diverse ecosystems classified as desert com­munities, mountain communities and estuarine communities and so on.

Since communities evolve throughout time, we may say that they are dynamic. The succession of species in an environment is a reflection of this dynamic nature. Eventually, after a number of shifts, a stable community forms, one that persists structurally and has an impact on the local climate.

Communities in different phases of development are referred to as seral communities, while those at the peak of their development are termed climax communities. Quantitative and qualitative methods may be used to describe the structure, composition, and other characteristics of plant communities.

Community Dynamics

Communities are complex adaptive systems that are always influencing and being influenced by their surroundings. The community charges are subtle and hard to spot at once, but become obvious after being tracked over time. Changes in plant communities due to the seasons are a universal phenomenon, especially in regions with wide seasonal temperature swings.

Over very long periods of time, however, many communities have stabilised at their current level of development and achieved a dynamic balance with environmental changes. Ecological succession refers to the process through which communities and their environments evolve over time in the same location.