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Cross-references
Algal Blooms
Eutrophication
Food Web/Trophic Dynamics
Trophic Dynamics
ECOLOGICAL SUCCESSION
Hai Ren
South China Botanical Garden, Chinese Academy of
Sciences, Guangzhou, China
Synonyms
Biotic succession; Community succession; Ecosystem
succession; Succession
Definition
Ecological succession refers to the sequential replacement
of species, communities, or ecosystems over time. When
applied to a given site, succession can encompass change
in communities (often defined by their dominant species)
and ecosystems (which drive or are driven by species
change), structural and functional change (usually but
not always driven by the biota), and abiotic environment
change.
The ecosystem is dynamic. Ecological succession has
internal and external causes. The interaction between various components within an ecosystem is the primary internal driving factor. External driving factors are natural
(e.g., land changes and tsunamis) and man-made (e.g.,
deforestation and fishing) which add to the ecological system. The external factors only can work through the internal factors. The mechanisms include dispersal and
establishment of species, competition, and facilitation.
Stages can be classified into pioneer or initial, early, mediate, and late stage. The final state of dynamic balance is
called climax.
Ecological succession can be divided into progressive
succession (generally following a period of increasing
biodiversity, biomass, and active nutrient cycling) and
retrogressive succession (generally following a period of
decreasing biodiversity, biomass, and nutrient cycling).
ECOLOGICAL SUCCESSION
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