ОписаниеExtinction Intensity.svg	A hand made lookalike for User:Dragons flight's PNG image Image:Extinction Intensity.png at en.wikipedia.
Дата	6 декември 2007, 19:55 (UTC)
Източник	Собствена творба
Автор	Rursus
Права (Повторно използване на файла)	Предоставя се разрешение за копиране, разпространение и/или модификация на този документ според Лиценза за свободна документация на ГНУ, в своята версия 1.2 или някоя следваща версия, издадена от Фондацията за свободен софтуер; без непроменими раздели, без текст на предната подвързия и без текст на задната подвързия. Копие на този лиценз е приложено в раздела Лиценз за свободна документация на ГНУ.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue Този файл се разпространява под лиценз Криейтив Комънс Признание — Споделяне на споделеното 3.0. Можете свободно: да споделяте – да копирате, разпространявате и излъчвате произведението да ремиксирате – да адаптирате произведението Съгласно следните условия: признание на авторството – Трябва да посочите авторството, да добавите връзка към лиценза и да посочите дали са правени промени. Можете да направите това по всякакъв разумен начин, но не и по начин, оставящ впечатлението, че същият/същите подкрепят вас или използването по някакъв начин на творбата от вас. споделяне на споделеното – В случай, че промените, видоизмените или използвайки като основа произведението, го надградите, то полученото производно произведение може да се разпространява само съгласно условията на същия или съвместим лиценз с оригиналния такъв. This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue inherited from Dragons flight
други версии	Dragons flight's original Text-free and correctly oriented version

Резюме

This figure shows the genus extinction intensity, i.e. the fraction of genera that are present in each interval of time but do not exist in the following interval. The data itself is taken from Rohde & Muller (2005, Supplementary Material), and are based on the Sepkoski's Compendium of Marine Fossil Animal Genera (2002). The yellow line is a cubic polynomial to show the long-term trend. Note that these data do not represent all genera that have ever lived, but rather only a selection of marine genera whose qualities are such that they are easily preserved as fossils.

NO MAS AL MALTRATO ANIMAL:

Lo que podemos entender no es posible que ya hace tiempo esto sucedió en mas de mil muertes de animales inocentes , debemos parar ante esto, debemos ayudar también al medio ambiente , gracias a ello , vemos que da vida a todos no solo a los bellos animales que hay en el mundo , nosotros mismos debemos cambiar esto cuidemos el medio ambiente y no al maltrato animal.

The "Big Five" mass extinctions (Raup & Sepkoski 1982) are labeled in large font, and a variety of other features are labeled in smaller font. The two extinction events occurring in the Cambrian (i.e. Dresbachian and Botomian) are very large in percentage magnitude, but are not well known because of the relative scarcity of fossil-producing life at that time (i.e. they are small in absolute numbers of known taxa). The Middle Permian extinction is now argued by many to constitute a distinct extinction horizon, though the actual extinction amounts are sometimes lumped together with the End Permian extinctions in reporting. As indicated, the "Late Devonian" extinction is actually resolvable into at least three distinct events spread over a period of ~40 million years. As these data are derived at the genus level, one can anticipate that the number of species extinctions is a higher percentage than shown here.

Many of the extinction events appear to be somewhat extended in time. In at least some cases this is the result of a paleontological artifact known as the Signor-Lipps effect (Signor & Lipps 1982). Briefly, this is the observation that inadequate sampling can cause a taxon to seem to disappear before its actual time of extinction. This has the effect of making an extinction event appear extended even if it occurred quite rapidly. Hence, when estimating the true magnitude of an extinction event it would be common to combine together the events occurring over several preceding bins as long as they also show excess extinctions. This explains why many estimates of the magnitude of an extinction event may be larger than the 20-30% shown as the largest single bin for most of the extinctions shown here.

References

• Raup, D. & Sepkoski, J. (1982). "Mass extinctions in the marine fossil record". Science 215: 1501–1503.
• Rohde, R.A. & Muller, R.A. (2005). "Cycles in fossil diversity". Nature 434: 209-210.
• Sepkoski, J. (2002) A Compendium of Fossil Marine Animal Genera (eds. Jablonski, D. & Foote, M.) Bull. Am. Paleontol. no. 363 (Paleontological Research Institution, Ithaca, NY).
• Signor, P. and J. Lipps (1982) "Sampling bias, gradual extinction patterns and catastrophes in the fossil record", in Geologic Implications of Impacts of Large Asteroids and Comets on the Earth, I. Silver and P. Silver Eds, Geol. Soc. Amer. Special Paper 190, Boulder Colo. p. 291-296.