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Overall, of the light that reaches Earth's surface, only about half of it is in the wavelength range that can be used by plants in photosynthesis (~400-700 nm wavelength) - this is called the Photosynthetically Active Radiation, or PAR. A food web depicts feeding connections in an ecological community and hence is also referred to as a consumer-resource system.In the Taiga biome, there is a vast number of species present in teh ecosystem. A blogging page for Intermediate 2 Students: So far in biology we have been looking at some of the worlds biggest ecosystems. The Arctic tundra is a cold, vast, treeless area of low, swampy plains in the far north around the Arctic Ocean. If the lemmings were removed from the food chain the polar bears would have less food sources and would result in having to eat the lichens.
An ecosystem is made up of a community of living things and their habitats that have a balanced relationship.
The coniferous forest occurs between 50 and 60 degrees north, and it is found in the northern parts of North America, Europe and Asia. Two thirds of the coniferous forest is found in Siberia, whilst the rest is found in Scandinavia, Alaska and Canada and is found close to Arctic tundra.
If you took away the predaceous insects then there will be no food for the toad so the toad would die out and there would be less food for the snakes. If you took away the foxes then there would be too many rabbits, squirrels, mice and seed – eating birds.
The pyramid of biomass represents the total mass of organisms at each level of the food chain. If an organism is removed from the food web, for example frogs, there would be more plants and plankton because they are only getting eaten by the possums, there would be less kookaburras because there would not be as much food for them to eat. In order to keep the ecosystem in balance, the numbers of different species also have to be kept in balance.

The earth’s coldest biome is the tundra which has permanently frozen subsoil, called permafrost. It includes Lapland and Scandinavia in the northern part of Europe, Siberia in Asia, and Alaska and Canada in North America, as well as most of Greenland.
This means that there would be fewer plants for other animals to eat and there would possibly be an increase in population of hawks and owls because that is there prey. Starting at the bottom of the food chain and food web is the vegetation, for example in my food chain and web the grass, berries and trees. For example, if the porcupine population is too low, the ermine population would not have enough to eat.
In a particular habitat we call this a community; it can have a number of different animals and plants. If more than one species is removed a bigger variety of organisms would decrease as there would be less to gain energy from. My last question was answered in less than 10 minutes :D Try it for yourself by posting a question! A population is different as this is when a group of organisms of the same species are living in a habitat.
The population of plants would increase as well due to the decrease of organisms eating them.
These producers are then eaten by the primary consumers, herbivores (eats only plants) and some by the omnivores (eats both plants and other animals). By the time the energy gets to the top of the pyramid, only about 10% of the initial energy is available for the consumer to use.
The energy travels from the producers to the primary consumers and provides them with the energy they need.

If one population is decreased or taken out completely, the rest of the food chain is affected because they rely on the organism for food.An invasive species could greatly affect an entire ecosystem, throwing it completely out of balance. Energy is lost because some of the energy that is absorbed is used before the organism dies.
The primary consumers are then eaten by the secondary consumers including the carnivores (eats meat), omnivores, and herbivores. For example, if a different species of snake was introduced into the ecosystem and managed to successfully reproduce, this could pose a big threat to the numbers of the different populations in the biome. The snake would begin to devour the food that other native species greatly need and thus, possibly destroying that population. Since snakes can produce many young at one time, in just a short period of time, thousands of invasive snakes would be introduced into the environment, completely destroying the order and balance that was previously present. The energy from the berries traveled through the porcupine and then into the ermine and is absorbed by the ermine.
The only way to prevent an invasive species is to be careful with the different species that are introduced into the ecosystem. Whereas, a density-dependent factor is a factor that affects a population based on its population, including, amount of resources(food,water,shelter), disease, etc.
Density factors usually cause the population to either increase or decrease according to the positive or negative affect it has on an ecosystem" (Yahoo Answers).

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