Biodiversity threats | Wikipedia audio article
Channel: Subhajit Sahu
Date: 27/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Biodiversity


00:04:52 1 Etymology
00:06:59 2 Definitions
00:09:43 3 Distribution
00:11:07 3.1 Latitudinal gradients
00:12:47 3.2 Hotspots
00:15:37 4 Evolutionary history
00:18:07 4.1 Evolutionary diversification
00:22:04 5 Ecosystem services
00:22:14 5.1 The balance of evidence
00:23:51 5.1.1 Services enhanced
00:24:01 5.1.1.1 Provisioning services
00:24:52 5.1.1.2 Regulating services
00:26:31 5.1.2 Services with mixed evidence
00:26:41 5.1.2.1 Provisioning services
00:26:52 5.1.2.2 Regulating services
00:28:40 5.1.3 Services hindered
00:28:49 5.1.3.1 Provisioning services
00:29:07 5.1.3.2 Regulating services
00:29:38 5.1.3.3 Provisioning services
00:30:08 5.1.3.4 Regulating services
00:32:23 5.2 Agriculture
00:37:03 5.3 Human health
00:40:48 5.4 Business and industry
00:41:29 5.5 Leisure, cultural and aesthetic value
00:43:04 5.6 Ecological services
00:45:14 6 Number of species
00:47:20 7 Measuring biodiversity
00:47:31 8 Species loss rates
00:50:53 9 Threats
00:52:12 9.1 Habitat destruction
00:54:43 9.2 Introduced and invasive species
00:59:14 9.2.1 Genetic pollution
01:00:27 9.3 Overexploitation
01:01:16 9.4 Hybridization, genetic pollution/erosion and food security
01:02:50 9.5 Climate change
01:04:38 9.6 Human overpopulation
01:06:16 10 The Holocene extinction
01:07:04 11 Conservation
01:08:26 11.1 Protection and restoration techniques
01:10:13 12 Protected areas
01:10:58 12.1 National parks
01:11:54 12.2 Wildlife sanctuary
01:12:36 12.3 Forest reserves
01:13:42 12.3.1 Steps to conserve the forest cover
01:14:28 12.4 Zoological parks
01:15:06 12.5 Botanical gardens
01:15:47 13 Resource allocation
01:16:34 14 Legal status
01:16:44 14.1 International
01:18:37 14.2 National level laws
01:20:37 15 Analytical limits
01:20:47 15.1 Taxonomic and size relationships
01:21:59 16 Diversity study (botany)
01:23:05 17 See also



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SUMMARY
=======
Biodiversity generally refers to the variety and variability of life on Earth. According to the United Nations Environment Programme (UNEP), biodiversity typically measures variation at the genetic, species, and ecosystem level. Terrestrial biodiversity tends to be greater near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth, and is richest in the tropics. These tropical forest ecosystems cover less than 10 percent of earth's surface, and contain about 90 percent of the world's species. Marine biodiversity tends to be highest along coasts in the Western Pacific, where sea surface temperature is highest, and in the mid-latitudinal band in all oceans. There are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time, but will be likely to slow in the future.Rapid environmental changes typically cause mass extinctions. More than 99.9 percent of all species that ever lived on Earth, amounting to over five billion species,  are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described. The total amount of related DNA base pairs on Earth is estimated at 5.0 x 1037 and weighs 50 billion tonnes. In comparison, the total mass of the biosphere has been estimated to be as much as 4 TtC (trillion tons of carbon). In July 2016, scientists reported identifying a set of 355 genes from the Last Universal Common Ancestor (LUCA) of all organisms living on Earth.The age of the Earth is about 4.54 billion years. The e ...