Extinct

North Ayrshire Local Biodiversity Action Plan, 2019-2031, published by North Ayrshire Council, states: “A taxon is Extinct when there is no reasonable doubt that the last individual has died. A taxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form. Species extinctions can occur at the local and national scales without global extinction occurring, for example the Small Blue butterfly (Cupido minimus) which in North Ayrshire was thought to have become locally extinct in the early 1980s. Extinction is the process by which species become extinct and can occur due to either natural or human-created causes. Research has shown that whilst there is a natural background rate of extinction, the rate of extinction has risen significantly during five mass extinction events. A sixth mass extinction event, caused by human impacts on biodiversity, is thought to be occurring at present.”

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