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Population in EcosystemsEcologystudies the relationships between organisms and their environment, including abiotic (non-living) and biotic (living) factors. Here, we discuss how organisms interact with their own species define keywords in ecology, such as populationsand niches. What is a population?We probably think about the human population when we hear the word population. However, we can also have populations of dogs, cats, wolves - basically any species. This is because a population is defined as all the individual organisms found in a given habitat of one species. Population: all the individual organisms found in a given habitat of one species. What is a community?A community is made up of all the various populations in a habitat. Species do not exist on their own; they interact with other species living in the same area to form communities. Community: all the living populations in a given area. A rainforest community might include several species of trees and shrubs growing at different heights and occupying different layers of the rainforest. It would also include the many birds, mammals, and insects who feed on these plants, as well as worms, fungi and bacteria that break down waste in the ecosystem. What is an ecosystem?So what is an ecosystem? An ecosystem includes the community of living organisms in a habitat and all the non-living (abiotic) components, such as water, soil and temperature. Ecosystems vary in size and scale. Some, such as ocean ecosystems, are extremely vast, while others, like pond ecosystems, are relatively small. Even humans can be considered ecosystems, as they are home to many complex interacting communities of microorganisms. Ecosystem: the collection of all communities in a habitat, together with the abiotic components. In a rainforest ecosystem, the plant community produces energy from the sun which is then consumed by the other organisms, and waste is recycled by other organisms in the system as well. In other words, the rainforest is a relatively self-sustaining unit. Little energy is exchanged between the rainforest and other ecosystems. However, no ecosystem is completely self-contained. For instance, many birds migrate between distant habitats at certain times of the year, thus linking multiple ecosystems. Ecosystems are dynamic and this is because the biotic and abiotic components are constantly in flux. Biotic factors, such as competition, and abiotic factors, such as temperature, can change at any time. These changes can happen at different rates, with some occurring very quickly (e.g., a decrease in population size due to the spread of a disease) and others very slowly (e.g. rocks undergoing erosion over time). Competition: where two organisms strive to obtain limited resource supplies. Intraspecific competition occurs between individuals of the same species whereas interspecific competition occurs between individuals of different species. Fig. 1 - Ecosystems Two major processes are very important to consider within an ecosystem. This includes the flow of energy and the flow of nutrients. Flow of energyFirst, there is a constant flow of energy between the organisms in the ecosystem, which occurs through feeding. Producers, such as plants, are eaten by primary consumers, who are then eaten by secondary consumers, who are eaten by tertiary consumers. When organisms die, they are decomposed and recycled. Consumers eat other organisms to obtain their energy, including primary, secondary and tertiary consumers. Flow of nutrientsThe second important process is the constant flow of nutrients within the ecosystem. Nutrients such as carbon, nitrogen, phosphorus, and important molecules such as water are recycled within the ecosystem. Carbon flows within the ecosystem in a process known as the carbon cycle. Carbon enters the atmosphere as carbon dioxide from the respiration of organisms, as well as emissions from factories, cities, and homes. It is then taken up by primary producers, who convert it into glucose during photosynthesis. Animals consume these plants and pass the energy along the food chain; they also continue to respire and release carbon as waste. Eventually, plants and animals die and decompose, and the carbon in their bodies returns to the atmosphere or is used as fuel. Fig. 2 - Carbon cycle What is a habitat?Organisms live in habitats, which are areas characterised by their physical conditions and occupants. An ecosystem is composed of several habitats. A rainforest ecosystem includes the canopy habitat, which might be home to some species of birds, as well as the forest floor habitat, which is home to fungi and small mammals. Habitats also house smaller units called microhabitats, which, as their name suggests, are home to organisms on an even smaller scale, such as worms and bacteria. What is a niche?In ecology, a niche describes the way that an organism fits into its environment. In other words, a niche is where the organism lives, what it does there, and how it interacts with others and its environment. It describes the organism’s role in the ecosystem. According to the competitive exclusion principle, no two species occupy the same niche in the same habitat. This is the proposition that two species that use the same limited resource cannot coexist at constant population levels, as even the slightest advantage of one species over another will allow the dominant species to outcompete the other to the point of extinction or exclusion. In other words, complete competitors cannot coexist. Population in Ecosystems - Key takeaways
Frequently Asked Questions about Population in EcosystemsMembers of the same species that live and interbreed with one another in the same habitat comprise a population. Multiple populations of different species can exist and interact together as a community. An ecosystem is composed of one or more communities. Ecosystems are dynamic. Many features within ecosystems, both biotic and abiotic, constantly undergo changes at many different rates. Populations are constantly changing, whether it’s in terms of their size or composition. Competition describes when organisms compete for the same resources within an environment. These resources, such as food, water, shelter, light and territory, are required for survival and reproduction. Members of the same species may also compete for mates. Competition among members of different species is referred to as intraspecific competition, while competition among members of the same species is called interspecific competition. An ecosystem is comprised of the many communities in a habitat and the abiotic factors present. Populations are composed of individual organisms in a given habitat of one species. This can include a population of humans, a population of whales, or a population of donkeys! Final Population in Ecosystems Quiz
Question An ecosystem is a system composed of one or more ________ of species that interact with one another and the _____ factors in the environment. Show answer
Question What are two important constant processes to consider in an ecosystem? Show answer Answer The constant flow of energy and the constant flow of nutrients. Show question
Answer A community is defined as all of the populations that live together in a particular place at the same time. Show question
Question Why can’t two species exist together in the same niche? Show answer Answer The competitive exclusion principle states that two species that use the same limited resource cannot coexist at constant population levels, as even the slightest advantage of one species over another will allow the dominant species to outcompete the other to the point of extinction or exclusion. Show question
Question What is the term for a reasonably well-defined place characterised by its physical conditions and occupants? Show answer
Question A niche is an organism’s _____ in an ecosystem. Show answer
Question According to the competitive exclusion principle, _______ competitors cannot coexist. Show answer
Question Are ecosystems large or small? Show answer Answer An ecosystem can be either large or small. An ocean is an example of a large ecosystem, while a pond is a small ecosystem. Show question
Question A community is made up of many species. True or false? Show answer
Question Describe the constant flow of energy process. Show answer Answer Producers such as plants are eaten by primary consumers, who are then eaten by secondary consumers, who are eaten by tertiary consumers. When organisms die, they are decomposed and recycled. Show question
Answer The study of the relationships between organisms and their environment, including abiotic and biotic factors. Show question
Answer A system composed of one or more communities of species that interact with one another and the abiotic factors in the environment. Show question
Answer Community refers to all of the populations that live together in a particular place at the same time. Show question
Question An ecosystem is composed of ______ habitats Show answer
Question Ecosystems are dynamic - true or false? Show answer
Answer Succession refers to the changes in the species that occupy a particular area over time. Show question
Question Define primary succession. Show answer Answer Primary succession occurs when a newly exposed or formed terrain is gradually colonised by new species. Show question
Question Which of the following traits is not likely to describe a pioneer species? Show answer
Question Identify which stage of succession lichen is likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession very large trees are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession bryophytes are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession shrubs are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession field mice are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession thermophylic bacteria are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question Identify which stage of succession mushrooms are likely to belong to (pioneer species, secondary colonisers, tertiary colonisers, shrubland, climax community). Show answer
Question True or false. Secondary succession usually occurs at a faster rate than primary succession. Show answer
Question Why does secondary succession occur faster than primary succession? Show answer Answer Newly cleared environments still have some of the resources they were able to accumulate over many years of succession. Surrounding areas that were not cleared provide an influx of species. Show question
Question Which of the following is not a result of succession? Show answer Answer The environment loses nutrients. Show question
Question Which of the following stages of succession has the highest species richness? Show answer
Question Why are climax communities usually less diverse than intermediate communities? Show answer Answer Because dominant species begin to outcompete and eliminate other species. Show question
Question Competition arises when two or more individuals share a ______ resource. Show answer
Question _________ competition occurs between individuals of the same species, while __________ competition occurs between individuals of different species. Show answer Answer intraspecific, interspecific Show question
Question Which principle states the following: ‘Two species that use the same limited resource cannot coexist at constant population levels; the one that uses these resources most effectively will eliminate the other.’? Show answer Answer The competitive exclusion principle Show question
Question Which is not an example of a predator-prey relationship? Show answer
Question Predator-prey relationships follow a ______ pattern. Show answer
Question Why might the effects of competition on population size be difficult to determine? Show answer Answer There are many complex and interconnected factors that affect population size; causal links are difficult to establish in natural populations as there may be a time lag between the instance of competition and its effect on population size. Show question
Question Determine whether the following scenario is best described by interspecific competition, intraspecific competition, or predation. Praying mantises feed on small insects in their habitat. Show answer
Question Determine whether the following scenario is best described by interspecific competition, intraspecific competition, or predation. As the largest trees in the forest develop denser foliage, shrubs on the forest floor have less exposure to light. Show answer Answer Interspecific competition Show question
Question Determine whether the following scenario is best described by interspecific competition, intraspecific competition, or predation. Fur seals fight one another to claim territory along the coastline during mating season. Show answer Answer Intraspecific competition Show question
Question What best describes the following scenario: Squirrels are fond of eating all kinds of seeds. Show answer
Question Why aren’t prey eradicated by the predator? Show answer Answer A wide range of external factors can allow the prey to survive. For instance, the area over which the prey population can disperse is usually much larger and more varied; this makes them harder to find and harder to catch. Predators may also have to contend with other factors such as competition with other potential predators, surviving the effects of heat or cold, and navigating difficult terrain, or they might even have to survive as prey themselves. Show question
Answer Predation is a process wherein one organism consumes another organism. Show question
Answer Competition arises when two or more individuals share a limited resource. Show question
Question What are some examples of limited resources? Show answer Answer
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Answer Ways in which the environment, its inhabitants, and the resources it provides are preserved through protection and management. Show question
Question Give three examples of conservation. Show answer Answer Any from:
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Question Why are national parks good? Show answer Answer They are a conservation method that keeps a species in its natural habitat. Show question
Question Why is it good to keep a species in its natural habitat? Show answer Answer It keeps them in an area where their natural support systems already exist Show question
Question What is an advantage of tourism to conservation? Show answer Answer It increases money and awareness for the conservation effort. Show question
Question What is an endangered species? Show answer Answer A species that is being threatened with extinction. Show question Discover the right content for your subjects
No need to cheat if you have everything you need to succeed! Packed into one app!Study PlanBe perfectly prepared on time with an individual plan. QuizzesTest your knowledge with gamified quizzes. FlashcardsCreate and find flashcards in record time. NotesCreate beautiful notes faster than ever before. Study SetsHave all your study materials in one place. DocumentsUpload unlimited documents and save them online. Study AnalyticsIdentify your study strength and weaknesses. Weekly GoalsSet individual study goals and earn points reaching them. Smart RemindersStop procrastinating with our study reminders. RewardsEarn points, unlock badges and level up while studying. Magic MarkerCreate flashcards in notes completely automatically. Smart FormattingCreate the most beautiful study materials using our templates. Sign up to highlight and take notes. It’s 100% free. What is an ecosystem community and population?An organism is a single living thing, a population is all of the organisms of the same species in the same place at the same time, a community is all populations in the same place at the same time (all living things), and an ecosystem is the reactions between living and nonliving components in a given area.
What does a community consist of in an ecosystem?An ecological community is a group of actually or potentially interacting species living in the same location. Communities are bound together by a shared environment and a network of influence each species has on the other.
What is an ecosystem community and habitat?You could think of habitat as the special place in a community in which a plant or animal lives. An ecosystem is a community of living and non-living things that work together. An ecosystem is basically the neighborhood where animal lives. The habitat is the animal's address in that neighborhood.
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