vilupti

maureeshas ka dodo pakshi maanav shikaar ke kaaran vilupt ho gaya
sanrakshan sthiti
vilupt hone ka jokhim
vilupt

vilupt
jungle se vilupt

sankatagrast

gambhir roop se viluptapraaya
viluptapraaya
asurakshit

kam jokhim

sanrakshan par nirbhar
sankataasann
khatre se baahar

yeh bhi dekhein

prakruti sanrakshan hetu antararaashtreeya sangh
IUCN laal soochi

विलुप्त विलुप्त जंगल से विलुप्त गंभीर रूप से विलुप्तप्राय विलुप्तप्राय प्रजातियां असुरक्षित प्रजातियां संकटासन्न संकटग्रस्त प्रजातियां खतरे से बाहर खतरे से बाहरIUCN संरक्षण स्थितियां

jeev vigyaan mein vilupti (extinction) us ghatna ko kehte hain jab kisi jeev jaati ka antim sadasya mar jaata hai aur fir vishv mein us jaati ka koi bhi jeevit jeev astitv mein naheen hota. aksar aisa isliye hota hai kyonki kisi jeev ka praakrutik vaataavaran badal jaata hai aur usamein in badli paristhitiyon mein panapane aur jeevit rahane ki kshamata naheen hoti. antim sadasya ki mrutyu ke saath hi us jaati mein prajanan dvaara vansh vruddhi ki sanbhaavanaaeain samaapt ho jaati hain. paaristhitiki mein kabhi kabhi vilupti shabd ka prayog kshetreeya star par kisi jeev prajaati ki vilupti se bhi liya jaata hai.

adhyayan se pata chala hai ki apni utpatti ke ausatan 1 karod varsh baad jaati vilupt ho jaati hai, haalaanki kuchh jaatiyaaain dasiyon karodon varshon tak jaari rahati hain. pruthvi par maanav ke viksit hone se pehle viluptiyaaain praakrutik vajahon se hua karti theen. maana jaata hai ki poore itihaas mein jitni bhi jaatiyaaain pruthvi par utpann hui hain unamein se lagbhag 99.9% vilupt ho chuki hain.[1] maanavon ke aagaman ke baad usane bahut si jaatiyon ko shikaar ya anya gatividhiyon se vilupt kar diya hai aur bahut si jaatiyon ko vilupti ki kaagaar par la khada kiya hai.

saamoohik vilupti ek vishesh prakaar ki ghatna hoti hai jismein ek chhoti se kaal mein bahut si jaatiyaaain vilupt ho jaati hain aur poori pruthvi ke sampoorn jeevan mein kami aati hai.[2] saamoohik vilupti pruthvi par asaadhaaran hai lekin jaatiyon mein chhit-put vilupti hoti rahati hai. bahut se vaigyaanik aadhunik kaal mein maanavon dvaara kiye gaye badlaavon (jaise ki vanon ka naash, pradooshan aur vaataavaran mein badlaav) ke kaaran teji se ho rahi viluptiyon ko lekar chintit hain.[3]

inhein bhi dekhein

sandarbh

  1. Inheritance and Evolution, Denise Walker, Evans Brothers, 2006, ISBN 978-0-237-53010-5, ... When a whole species dies out, we say that it has become extinct. Extinction is usually a natural process and it is estimated that 99.9 per cent of all species that have ever lived are now extinct ...
  2. Mass Extinctions and Their Aftermath, A. Hallam, P. B. Wignall, Oxford University Press, 1997, ISBN 978-0-19-854916-1, ... He defines mass extinction as any substantial increase in the amount of extinction (that is, lineage termination) suffered by more than one geographically widespread higher taxon during a relatively short interval of geological time, resulting in at least temporary decline in their standing diversity ... more concise one offered here is that a mass extinction is an extinction of a significant proportion of the world's biota in a geologically insignificant period of time ...
  3. Encyclopedia of Time: Science, Philosophy, Theology, & Culture, Edited by H. James Birx, SAGE, 2009, ISBN 978-1-4129-4164-8, ... There have been five mass extinctions in geological time. It is believed that a sixth mass extinction is currently in progress, theguda first since the advent of humankind ...