After July 2023 was confirmed as the warmest month on record for planet Earth, a new study has shown the world's tropical forest canopies may be closer to critical high-temperature thresholds than previously known.
Plants & Animals
Aug 23, 2023
0
93
Climate change and habitat destruction may have already caused the loss of more than one-tenth of the world's terrestrial genetic diversity, according to new research led by Carnegie's Moises Exposito-Alonso and published ...
Ecology
Sep 22, 2022
0
168
The lava caves, lava tubes and geothermal vents on the big island of Hawaiʻi have higher bacterial diversity than scientists expected, reports a new study in Frontiers in Microbiology. These habitats represent how life might ...
Ecology
Jul 21, 2022
0
141
In the evolutionary arms race between rattlesnakes and their prey, rodents, birds and other reptiles develop resistance to the snakes' deadly venom to survive. But new research led by the University of Colorado Boulder and ...
Evolution
Jul 18, 2022
0
81
A new study by Yale ichthyologists provides a clearer picture of species diversity among black basses—one of the most cherished and economically important lineages of freshwater gamefish. Their findings can help guide the ...
Evolution
Jun 6, 2022
0
600
The vaquita porpoise, the world's smallest marine mammal, is on the brink of extinction, with 10 or fewer still living in Mexico's Gulf of California, their sole habitat. But a genetic analysis by a team of UCLA biologists ...
Plants & Animals
May 5, 2022
0
430
The oldest unequivocal evidence of upright walking in the human lineage are footprints discovered at Laetoli, Tanzania in 1978, by paleontologist Mary Leakey and her team. The bipedal trackways date to 3.7 million years ago. ...
Evolution
Dec 1, 2021
0
2196
Watching paint dry has nothing on watching a forest grow.
Ecology
Sep 6, 2021
0
195
There's been an age-old question going back to Darwin's time about the relationships among the world's five living rhinoceros species. One reason answers have been hard to come by is that most rhinos went extinct before the ...
Plants & Animals
Aug 24, 2021
0
1767
A growing body of evidence suggests that biodiversity loss increases our exposure to both new and established zoonotic pathogens. Restoring and protecting nature is essential to preventing future pandemics. So reports a new ...
Ecology
Apr 5, 2021
0
3063
Species diversity is an index that incorporates the number of species in an area and also their relative abundance. It is generally a much more useful value than species richness.
The most common index of species diversity is a family of equations called Simpson's Diversity Index[1].
Here is one such example
D = (n / N)2
Where n is the total number of organisms of a particular species and N is the total number of organisms of all species.D is the value of diversity. It can range between 0 and 1, whre 1 is the richest an Ecosystem can possibly be.
Humans have a huge effect on species diversity; the main reasons are: - Destruction, Modification, and/or Fragmentation of Habitat - Introduction of Exotic Species - Overharvest - Global Climate Change
This text uses material from Wikipedia, licensed under CC BY-SA
