ecological extinction
a fish population where numbers are too few to maintain their role ecologically

Dictionary of ichthyology. 2009.

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  • Ecological extinction — Types and definitions of extinctions = Estes, Duggins, and Rathburn (1989) recognize three distinct types of extinction.Global extinction is defined as “the ubiquitous disappearance of a species. [Estes et al. The ecology of extinctions in kelp… …   Wikipedia

  • Extinction threshold — is a term used in conservation biology to explain the point at which a species, population or metapopulation, experiences an abrupt change in density or number because of an important parameter, such as habitat loss. It is at this critical value… …   Wikipedia

  • Ecological threshold — can be described as the point at which a relatively small change in external conditions causes a rapid change in an ecosystem. When an ecological threshold has been passed, the ecosystem may no longer be able to return to its state. The… …   Wikipedia

  • Ecological footprint — The ecological footprint is a measure of human demand on the Earth s ecosystems. It is a standardized measure of demand for natural capital that may be contrasted with the planet s ecological capacity to regenerate.[1] It represents the amount of …   Wikipedia

  • Ecological niche — Black smokers create ecological niches with their unusual environment In ecology, a niche (   …   Wikipedia

  • Ecological succession — Succession after disturbance: a boreal forest one (left) and two years (right) after a wildfire. Ecological succession, is the phenomenon or process by which a community progressively transforms itself until a stable community is formed. It is a… …   Wikipedia

  • Extinction event — …   Wikipedia

  • Ecological trap — Ecological traps are scenarios in which rapid environmental change leads organisms to prefer to settle in poor quality habitats. The concept stems from the idea that organisms that are actively selecting habitat must rely on environmental cues to …   Wikipedia

  • Ecological sanitation — Ecological sanitation, also known as ecosan or eco san, are terms coined to describe a form of sanitation that usually involves urine diversion and the recycling of water and nutrients contained within human wastes back into the local environment …   Wikipedia

  • Ecological collapse — refers to a situation where an ecosystem suffers a drastic, if not permanent, reduction in carrying capacity for all organisms, often resulting in mass extinction. Usually, an ecological collapse can be precipitated by a disastrous event… …   Wikipedia

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