<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Dismiss
Skip Navigation

10.1: Biological Communities

Difficulty Level: At Grade Created by: CK-12
Atoms Practice
Estimated4 minsto complete
%
Progress
Practice Biological Communities
 
 
 
MEMORY METER
This indicates how strong in your memory this concept is
Practice
Progress
Estimated4 minsto complete
%
Estimated4 minsto complete
%
Practice Now
MEMORY METER
This indicates how strong in your memory this concept is
Turn In

How is a community of people like a community of organisms?

Different species have different jobs within their community. Some are the farmers, some are traders, some are the janitors, and others have different roles.

Biological Communities

A population consists of all individuals of a single species that exist together at a given place and time. A species is a single type of organism that can interbreed and produce fertile offspring. All of the populations living together in the same area make up a community.

Ecosystems

An ecosystem is made up of the living organisms in a community and the nonliving things, the physical and chemical factors, that they interact with. The living organisms within an ecosystem are its biotic factors (Figure below). Living things include bacteria, algae, fungi, plants, and animals, including invertebrates, animals without backbones, and vertebrates, animals with backbones.

A plant, invertebrate, and vertebrates are all part of an ecosystem

(a) The horsetail Equisetum is a primitive plant. (b) Insects are among the many different types of invertebrates. (c) A giraffe is an example of a vertebrate.

Physical and chemical features are abiotic factors. Abiotic factors include resources living organisms need, such as light, oxygen, water, carbon dioxide, good soil, and nitrogen, phosphorous, and other nutrients. Nutrients cycle through different parts of the ecosystem and can enter or leave the ecosystem at many points. Abiotic factors also include environmental features that are not materials or living things, such as living space and the right temperature range. Energy moves through an ecosystem in one direction.

Niches

Organisms must make a living, just like a lawyer or a ballet dancer. This means that each individual organism must acquire enough food energy to live and reproduce. A species' way of making a living is called its niche. An example of a niche is making a living as a top carnivore, an animal that eats other animals, but is not eaten by any other animals (Figure below). Every species fills a niche, and niches are almost always filled in an ecosystem.

The top carnivore niche is filled by lions on the savanna, wolves in the tundra, and tuna in the oceans

The top carnivore niche is filled by lions on the savanna.

Habitat

An organism’s habitat is where it lives (Figure below). The important characteristics of a habitat include climate, the availability of food, water, and other resources, and other factors, such as weather.

Birds living in a saguaro cactus

Birds living in a saguaro cactus. A habitat may be a hole in a cactus or the underside of a fern in a rainforest. It may be rocks and the nearby sea.

Summary

  • All of the individuals of a species that exist together at a given place and time make up a population. A community is made up of all of the populations in an area.
  • The living and nonliving factors that living organisms need plus the communities of organisms themselves make up an ecosystem.
  • A habitat is where an organism lives and a niche is what it does to make a living.

Review

  1. Define species, population, community, niche, habitat, biotic factor, and abiotic factor.
  2. Diagram how the words listed above relate to each other.
  3. Choose a type of wild organism that you're familiar with and list the biotic and abiotic factors that it needs to live.

Explore More

Use this resource to answer the questions that follow.

  1. What are the two primary parts of an ecosystem?
  2. What are the biotic parts?
  3. What are the abiotic parts?
  4. How big is an ecosystem?
  5. Where does the energy to run an ecosystem come from?
  6. How does that energy move through an ecosystem?
  7. What is a habitat? What is included in it?
  8. What is a niche? What is included in it?

    Notes/Highlights Having trouble? Report an issue.

    Color Highlighted Text Notes
    Please to create your own Highlights / Notes
    Show More

    Vocabulary

    abiotic

    Non-living features of an ecosystem include space, nutrients, air, and water.

    biotic

    Living features of an ecosystem include viruses, plants, animals, and bacteria.

    community

    All of the populations of organisms in an ecosystem.

    ecosystem

    All of the living things in a region and the physical and chemical factors that they need.

    niche

    An organism’s job within its community.

    Image Attributions

    Show Hide Details
    Description
    Difficulty Level:
    At Grade
    Grades:
    Date Created:
    Feb 24, 2012
    Last Modified:
    Sep 11, 2016
    Save or share your relevant files like activites, homework and worksheet.
    To add resources, you must be the owner of the Modality. Click Customize to make your own copy.
    Please wait...
    Please wait...
    Image Detail
    Sizes: Medium | Original
     
    SCI.ESC.811.L.1
    Here
    Add Note
    Please to create your own Highlights / Notes