What is a climax community? Why does secondary succession occur faster than primary succession? How do lichens contribute to primary succession? How can primary succession lead to soil formation? What are some examples of primary succession? What is primary succession? What is the difference between primary and secondary succession? Ecological succession occurs because? See all questions in Ecological Succession. Impact of this question views around the world. Louis, MO Subject optional.
Email address: Your name:. Possible Answers: None of these. Correct answer: An environment lacking plant and animal life. Explanation : Primary succession is the colonizing of a new environment that lacks organisms and plant life. Report an Error.
Which of the following best describes when secondary succession occurs? Possible Answers: A previously inhabited environment. Correct answer: A previously inhabited environment. Explanation : Secondary succession can be described as the colonization of a habitat that once supported plant and animal life but was abandoned due to ecological disturbance. Possible Answers: Secondary succession.
Pioneering succession. Primary succession. Correct answer: Secondary succession. Explanation : Primary succession occurs in an environment without previous life, or a barren habitat. Possible Answers: Lichen. Oak trees. Pine trees. Correct answer: Lichen. Possible Answers: In an environment recently burned by a wildfire. Correct answer: On a newly created volcanic island.
Possible Answers: During the summer. Correct answer: Near early stages of succession. Explanation : Pioneer species are the first species to colonize an environment, and thus would be found in the early stages of succession.
Possible Answers: Lava flow. Correct answer: Lava flow. Possible Answers: keystone species. Correct answer: pioneer species. Explanation : The first species to inhabit an area that has been disrupted are called pioneer species. Copyright Notice. For instance, a primary succession occurs when a group of species or a community colonize a barren, newly formed habitat. An example of primary succession is the establishment of plant or animal communities in an area where no soil initially exists, such as bare rocks formed from a lava flow.
Other examples are the colonization of a barren area following a severe landslide or a recently exposed land from retreating glaciers. Another is the occupying of harsh habitats, such as sand dunes. The extremely hot temperature of sand dunes makes them available for habitation to only a few highly specialized plants and animals. Secondary succession occurs when a previously occupied area is colonized by a new dominating group of species or communities.
In secondary succession, the new inhabitants replace the previous communities over a habitat that had been exposed to a particular ecological disturbance.
The disturbance may be an external or an internal factor. An example of secondary succession is the recolonization of an area damaged by fire. Another difference between primary and secondary successions is the nature of the habitat.
In primary succession, living things colonize a barren land, which means it lacks topsoil. Conversely, in secondary succession, living things will be re-colonizing a previously inhabited area and therefore the area would have topsoil containing organic matter from the previous inhabitants. Primary succession takes a longer period of time to be established and completed, i. On the contrary, the secondary succession often occurs relatively faster, requiring only a shorter period of time, like a decade or a hundred years.
This is because an area that has just been newly formed would be initially unfavorable for most life forms. The newly formed land, for instance, would lack soil but would be comprised of bare rocks. This is the starting stage of primary succession. A series of physicochemical changes have to occur until such time that they become more conducive to life.
The species that are able to inhabit a newly formed or formerly uninhabited land are called pioneer species and the community that has successfully established and dominated is called pioneer community. A community refers to an ecological unit comprised of a group of organisms or a population of different species that occupy a given area. A community may refer to a small population inhabiting small areas as in a pond or communities on large geographical areas, which define biome.
The settling of a pioneer community marks the start of the colonizing phase of primary succession. Examples of pioneer species are lichens, algae , and fungi. These species are more tolerant and eventually contribute to the formation of the soil by breaking down rocks into smaller particles.
They also provide organic matter to the area.
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