You have new items in your feed. Click to view.
Question and answer
Explain why biodiversity is important for the survival of species, including humans. How could the destruction of the rainforest, and its biodiversity, affect people living in the United States?
Rainforests now occupy less then ½ of the land that they did 100 years ago (that’s less than 2% of the earth’s surface). The major causes of biodiversity decline are land use changes, pollution, changes in atmospheric CO2 concentrations, [ changes in the nitrogen cycle and acid rain, climate alterations, and the introduction of exotic species, all coincident to human population growth. For
rainforests, the primary factor is land conversion. Climate will probably change least in tropical regions, and nitrogen problems are not as important because growth in rainforests is usually limited more by low phosphorus levels than by nitrogen insufficiency. The introduction of exotic species is also less of a problem than in temperate areas because there is so much diversity in tropical forests that newcomers have difficulty becoming established (Sala, et al., 2000). a. Human population growth: The geometric rise in human population levels during the twentieth century is the fundamental cause of the loss of biodiversity. It exacerbates every other factor having an impact on rainforests (not to mention other ecosystems). It has led to an unceasing search for more arable land for food production and livestock grazing, and for wood for fuel, construction, and energy. Previously undisturbed areas (which may or may not be suitable for the purposes to which they are constrained) are being transformed into agricultural or pasture land, stripped of wood, or mined for resources to support the energy needs of an ever-growing human population. Humans also tend to settle in areas of high biodiversity, which often have relatively rich soils and other attractions for human activities. This leads to great threats to biodiversity, especially since many of these areas have numerous endemic species. Balmford, et al., (2001) have demonstrated that human population size in a given tropical area correlates with the number of endangered species, and that this pattern holds for every taxonomic group. Most of the other effects mentioned below are either consequent to the human population expansion or related to it. The human population was approximately 600,000 million in 1700, and one billion in 1800. ]
Expert answered|lgcn|Points 1353|
Asked 2/14/2013 7:18:36 PM
0 Answers/Comments
Get an answer
New answers

There are no new answers.


There are no comments.

Add an answer or comment
Log in or sign up first.
26,785,451 questions answered
Popular Conversations
Weegy: C. [ July On July 4, 2008, our planet is at the distant end- a point astronomers call "aphelion." This puts ...
1/18/2017 1:59:28 AM| 3 Answers
Simplify -(-2a + 13) + (-9a - 2) - (-7a - 3). 12 -12 14a - 12 14a - ...
Weegy: -(-2a + 13) + (-9a - 2) - (-7a - 3) = 2a - 13 - 9a - 2 + 7a + 3; = -12 User: Given: Q = 7m + 3n, R = 11 - ...
1/18/2017 7:14:36 AM| 2 Answers
Soil formation is most influenced by _____. climate plants wind ...
Weegy: Soil formation is most influenced by wind.
1/18/2017 9:13:59 AM| 2 Answers
Weegy Stuff
Points 361 [Total 361] Ratings 1 Comments 351 Invitations 0 Offline
Points 196 [Total 208] Ratings 0 Comments 196 Invitations 0 Offline
Points 176 [Total 607] Ratings 2 Comments 156 Invitations 0 Offline
Points 89 [Total 984] Ratings 2 Comments 69 Invitations 0 Offline
Points 85 [Total 87] Ratings 5 Comments 35 Invitations 0 Offline
Points 68 [Total 4027] Ratings 0 Comments 68 Invitations 0 Offline
Points 24 [Total 96] Ratings 0 Comments 24 Invitations 0 Offline
Points 11 [Total 11] Ratings 0 Comments 11 Invitations 0 Offline
Points 10 [Total 10] Ratings 1 Comments 0 Invitations 0 Offline
Points 10 [Total 10] Ratings 0 Comments 0 Invitations 1 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.