Ecological threshold

Source: Wikipedia, the free encyclopedia.

Ecological threshold is the point at which a relatively small change or

pressures caused by human activities or natural processes.[1]
tipping point
are examples of other closely related terms.

Characteristics

Thresholds can be characterized as points or as zones. Zone-type thresholds imply a gradual shift or transition from one state to another rather than an abrupt change at a specific point.[2] Ecological thresholds have caught attention because many cases of catastrophic worsening of conditions have proved to be difficult or nearly impossible to remedy (also known as points of no return). Ecological extinction is an example of a definitive point of no return.

Ecological thresholds are often characterized by hysteresis, which means the dependence of the state of a system on the history of its state. Even when the change is not irreversible, the return path from altered to original state can be drastically different from the development leading to the altered state.

Another related concept is

panarchy
. Panarchy views coupled human-natural systems as a cross-scale set of adaptive cycles that reflect the dynamic nature of human and natural structures across time and space. Sudden shifts in ecosystem state can induce changes in human understanding of the way the systems need to be managed. These changes, in turn, may alter the institutions that carry out that management and as a result, some new changes occur in ecosystems.

Detection

There are many different types of thresholds and detecting the occurrence of a threshold is not always straightforward. One approach is to process time series which are thought to display a shift in order to identify a possible jump. Methods have been developed to enhance and localize the jumps.[3]

Examples

Some examples of ecological thresholds, such as clear lakes turning into turbid ones, are well documented but many more probably exist. The thresholds database[4] by Resilience Alliance and Santa Fe Institute includes over one hundred examples.

See also

References

  1. S2CID 11506432
    .
  2. ISSN 0006-3207
    .
  3. ^ Thresholds enhancer Archived 2011-07-20 at the Wayback Machine
  4. ^ "Thresholds database". Resilience Alliance. Retrieved 2022-05-09.

External links

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