Biodiversity
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New York has how many species
105
Green land is situated
71° N
In green land hoe many species are there
56
Equador has how many times more more species diversity than temperate region like Midwest in USA
10
Bio diversity in Amazon forest
40,000 species of plants 3,000 fishes 1,300 birds 427 mammals 427 Amphibians 378 Reptiles More than 1,25, 000 vertebrates
How many Insects are in Amazon forest waiting to be discovered
2 million
Species area relation was given by
Alexander Von Hamboldt
Relation btw species diversity and area is
Rectangular hyperbole
Eq of straight line given by Alexander von humboldt
Log S= log C + Z log A
Z is called
Regression coefficient
The value of Z lies in the region of
0.1 to 0.2
The value of Z for continenets isn
0.6 to 1.2 ( much steeper )
For frugivores and mammals in tropical forest of diffrent continenets the slope is
1.15
Who found that the area with less species diversity has more seasonal variations
David tilman
Rivet popper hypothesis is given by
Paul Ehrlich
In rivet popper hypothesis rivet is
Species
Colonization of tropical pacific islands by humans have led to the extinction of
2,000 species of birds
IUCN red list documents the extinction of in last 500 yrs
784 ( 334 vertebrates, 359 invertebrates, 87 plants )
Thylacine was found in
Australia
Last 20 yrs have witnessed the disappearance of
27 species
How much % of birds are facing extinction
12
How much % of mammals face extinction
23
How much species of Amphibians
32
How much % of gymnosperms
31