# es 103 final study guide

what is primary succession and how does it differ from secondary succession?
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Terms in this set (28)
succession is a term that means the directional and continuous pattern of colonization and Extinction on a site by species populations.
Primary succession occurs in a new habitat that has not previously been influenced by a community such as sand dunes, lava flows, and soils after a glacier retreat.
Secondary succession is the subsequent sequence of a species influence by previous Community such as spores, seeds in the soils.
The level of biological organization the study of succession often occurs is within a community because what succession shows is community patterns of colonization, replacement, and extinction patterns of the community overtime. within the community for mechanisms of biotic succession or studied which are differential dispersion, differential survival, facilitation, biotic interactions.
the intermediate disturbance hypothesis predicts that with too little disturbance it allows certain highly competitive species to take over the entire system but with too much disturbance this allows only a few specialized disturbance tolerant species to survive, thus diversity is maximized where disturbance is strong enough to create opportunities for successional species, but not too strong as to exclude all late successional species.
the ecological niche of a species describes the effect environmental conditions has on the species in which they respond to the competition for resources in order to survive grow and reproduce.
This differs from a species habitat because habitat just describes the physical, chemical, and structural conditions under which a species can exist
ecosystem stability is the consistency of an ecosystems conditions as influenced by internal conditions; little fluctuation in year-to-year lead to high stability.
meanwhile ecosystem resilience is the ability of an ecosystem to recover and return to similar state in which the more diverse the ecosystem is the more stable most of the time
ecosystem resistance is the ability of an ecosystem to resist change to external forces.
the first mechanism is differential dispersion which describes pioneer species establishing in a certain area in their succession over time.
the second mechanism is a differential survival which describes species in a certain area that once they are established well successfully overtime either reach Extinction or survive.
the third mechanism is facilitation in which the establishment of one species may modify the physical environment which then goes on to favor or disfavor another species.
the fourth mechanism is biotic interactions which describes how interacting establish species either favor or disfavor each other directly.
ecosystem structure is composed of biotic or living things in abiotic or physical chemical components.
and ecosystems function is known as its processes which include cycling of chemical elements or material, flow of energy, and changes over time as affected by biotic succession.
these properties and processes are different from goods and services because ecosystem services are the set of ecosystem functions and structure that are directly linked to benefit human well-being while the basic characteristics of an ecosystem do not have direct links to benefit human well-being.
keystone species is a species that influences the ecological comparison, structure, and function of its Community for more than its abundance would suggest.
Endemic species are native species found only in a particular habitat or location.
exotic species are species introduced by manned beyond the natural range.