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extinction
extinct
The Oxford Pocket Dictionary of Current English
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2009
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© The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information)
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ex·tinct
/ ikˈsting(k)t/
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adj.
no longer in existence:
trilobites and dinosaurs are extinct.
∎
(of a volcano) not having erupted in recorded history.
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Mass extinctions and macroevolution
Magazine article from: Paleobiology; 1/1/2005; ; 700+ words
; ...between later background extinction and the major mass extinctions. In any case, the...the intervals of lower extinction intensity between the "Big Five" extinction peaks of the Phanerozoic). Mass extinctions would thus represent...
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Extinction-induced variability in human behavior.(Report)
Magazine article from: The Psychological Record; 6/22/2009; ; 700+ words
; ...be changed by reinforcement and be a product of extinction. Under extinction, responses that led to reinforcers in the past...on the reinforcement of variability, but while extinction-induced variability appears essential for the...
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Spacing extinction trials alleviates renewal and spontaneous recovery
Magazine article from: Learning & Behavior; 2/1/2009; ; 700+ words
; Studies of extinction in classical conditioning situations...varying the intertrial interval during an extinction treatment in a fear-conditioning...at test (i.e., more effective extinction) when extinction trials were widely...
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EXTINCTION sunday briefing sunday briefing While the disappearance of species such as tigers and mountain gorillas grabs the headlines and fills TV schedules, less well-known is the fact that we appear to be living through an extinction event bigger than that which wiped out the dinosaurs. This assault on biodiversity is seen by many scientists as a greater threat to mankind than climate change.
Newspaper article from: The Sunday Herald; 12/10/2006; 700+ words
; ...YEARS AGO A series of mass extinctions eliminated many brachiopods...pictured below). These extinctions could have been caused by...444 MILLION YEARS AGO Two extinction events occurred, which together...largest of the five major extinctions in history in terms of the...
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Extinction and quiescence in marine animal genera
Magazine article from: Paleobiology; 4/1/2007; ; 700+ words
; ...proxies for true extinctions, then there is appreciable global extinction in every stage...backsmearing of extinctions by incomplete...to which mass extinctions represent something...aggravated background extinction (Jablonski 1986...
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Evidence for extinction selectivity throughout the marine invertebrate fossil record
Magazine article from: Paleobiology; 10/1/2009; ; 700+ words
; ...this nonrandom extinction is selective clustering of extinctions in genera consisting...species which possess extinction-biasing traits...debated whether mass extinctions form a distinct...background" extinction (Bambach et al...
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Extinction rates higher in open-ocean settings during mass wipeouts
News Wire article from: The Hindustan Times; 11/21/2009; 641 words
; ...has found that extinction rates higher in...settings during mass extinctions. The research...found that, while extinction rates in the two...times between mass extinctions, there was a strikingly...rates during mass extinctions were significantly...susceptible to the ...
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Origination, extinction, and mass depletions of marine diversity
Magazine article from: Paleobiology; 10/1/2004; ; 700+ words
; ...distinct mass extinctions. Each of the...pattern of extinction, and the diversity...Background" Extinction The idea that mass extinctions stand out as...class of mass extinctions. They also...background" extinction stages and...
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Extinction and health.(species extinction events in world history)
Magazine article from: Earth Island Journal; 6/22/1999; ; 700+ words
; ...identify five mass extinctions in the fossil record, and a host of smaller extinction events, the least...still picturing an extinction event orders of magnitude...old-fashioned mass extinctions the planet used to...apparent background extinction level. We have certainly...
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Paleobiogeographical extinction patterns of permian brachiopods in the Asian-western Pacific region
Magazine article from: Paleobiology; 10/1/2002; ; 700+ words
; ...biogeography and the mass extinctions in this region attracted...Cretaceous-Tertiary mass extinction (e.g., Raup and Jablonski...the end-Ordovician mass extinctions (e.g., Sheehan and Coorough...the Permian-Triassic mass extinction (Valentine and Moores 1973...
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Extinction
Book article from: Biology
Extinction Extinction is the termination of...impact on native predators. The extinction of the Tasmanian wolf in the twentieth...very high reproductive rate. Mass Extinctions Mass extinction events have occurred periodically...
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extinctions and mass extinctions
Book article from: The Oxford Companion to the Earth
extinctions and mass extinctions Extinction of species is a continuous process, and evidence...result in the development of new species. Mass extinctions are events during which the rate of extinction rises dramatically above this background rate...
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Mass Extinction
Encyclopedia entry from: The Gale Encyclopedia of Science
...what can be called the background extinction rate, the extinctions that are always occurring at a normal...large “ normal ” extinction becomes suddenly a mass extinction. Mass extinctions are characterized by the loss of...
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extinction
Book article from: A Dictionary of Earth Sciences
extinction 1. In optical mineralogy, a mineral is said to be in extinction when the vibration direction of the two rays of...360° rotation of the stage. See OBLIQUE EXTINCTION ; STRAIGHT EXTINCTION ; SYMMETRICAL EXTINCTION...
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mass extinctions
Book article from: The Oxford Companion to the Earth
mass extinctions see extinctions and mass extinctions
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