Continental drift has helped create the diversity we see present in modern day plants and animals. Through a process of speciation, the movement of the continents has had a generous role throughout evolution, effecting and distributing flora and fauna. The Earth’s continents were once one, a large supercontinent called Pangea that later separated into two smaller ones known as Gondwana and Laurasia. The separation and collision of continents has not only created some of the valleys and mountain ranges which are significant landmarks on the Earth’s surface, but it has also brought species together and apart again, consequently letting natural selection take over and lead to the animals we see today. “The timescale on which continents …show more content…
Being better adapted in general, they out competed nearly all the marsupials in that area and the marsupials in turn died out. The bridge from the South America / Africa area to the Australia / Antarctica area closed out, so placental animals could not completely dominate there.
Weather it be though speciation or survival of the fittest, every aspect of animal life as we know it has been affected by continental drift one way or another. Geologists and Biologists alike could trace the shifting of the tectonic plates and note the effects it has on both the Earth’s surface and the Earth’s biodiversity. Continental drift is responsible for the diversity we see in animals today, and in the far future it will likely be still responsible for it.
Appendix
FIGURE A
Alfred Wegner was the first person to make the suggestion that all the continents were once one. Because he had no proof, he was disregarded. We now know today that the tectonic plates are in fact moving, and bringing the continents with them and that Pangea did in face exist. One of Wegner’s proofs of Pangea was the jigsaw fit between South America and Africa.
Image is courtesy of http://www.canadiangeographic.ca
FIGURE B
After Pangea and before the continents drifted to the way they are today; there were only two major continents: Laurasia and Gondwana, as you see in the figure on the left. Image is
In 1596- Abraham Ortelius took note that the coastlines of the continents seemed to be too fitting together. He initiated a theory that stated that the continents were probably joined at one point in time and were torn apart between Europe and Africa. In the year of 1912, Alfred Wegener stated that the continents were once joined in a supercontinent called Pangea.
2. The theory of “Pangaea” exists suggesting that the continents were once nestled together into one mega-continent. The continents then spread out as drifting islands.
Between 280 million and 225 million years ago, the earth’s previously separated land areas became welded into a landmass called Pangaea. About 120 million years ago, due to the continental drift, this landmass began to separate. It split the old world and the new world apart, which dividing North and South America from Eurasia and Africa. The separation lasted for million years that it fostered divergent evolution. The new world and the old world’s biological evolution followed individual paths, becoming two separate biological worlds. However, after 1492, human voyagers reversed this tendency. In October 1492, Christopher Columbus and his crew landed in Bahamas. After Columbus arrived in
This allows us to see, up close, the transformation of animals. What was once isolated to only the sea, evolved into something that could now dwell on land as well. Throughout the course of history, more and more evolutionary traits will occur allowing different species to prosper where they once could not.
To support the theory of continental drift is through topography, surveying the floors of oceans, charts of rock magnetism, and statistics on rock ages (Trefil & Hazen, 2010). At one time scientist believed that the deep ocean floors were flat; accumulating the sediment that progressively wore away from the prehistoric landmasses (Trefil & Hazen, 2010). However, they discovered steep-walled valleys and elevated highlands. This was evidences that just as the continents are transformed and are active, so to is the seafloor (Trefil & Hazen, 2010). The Mid- Atlantic Ridge, positioned in the central part of the Atlantic Ocean, is recorded to be the longest mountain range on this planet. Volcanoes, lava flow, and earthquakes are a source of
Millions of years ago according to scientist the whole world was one large mass called Pangea. When this mass began to split, it divided the Americas from the Eastern World along with the people on it. This resulted in tens of thousands years apart from one another which led to different developments on each continent. After all these years though a man named Columbus’s discovers the Americas in 1492. As soon as he took
About 200 million years ago there was one big continent called Pangaea. They believed that, this landmass began to separate. They believed that the Atlantic Ocean formed, dividing Africa and Eurasia from the Americas. Over the next several million years plants and animals changed and made to separate biological worlds. It wasn’t until Christopher Columbus and his crew sailed to the Americas in October 1492, they started interacting with each other.
If new crust is indeed being produced at the rifts, where does the additional older crust go?
The article discussed the changes in many habitats due to anthropogenic activity. Anthropogenic is an adjective that describes changes in nature due to the people. Next, this article discussed climate change and the impact that it is having on species like clams, and fish due to ocean temperatures rising. The article also addressed carbon dating of fossils to look for cause of extinctions. Human development and agriculture have had a tremendous impact on the population of many species that are terrestrial. Deforestation is a big problem that has caused a decline in the bird species. Commercial fishing in many areas has led to a decline in fish populations. Furthermore this article
Phylogeography is a field of study that implements biogeography and genetics to understand the geographic distribution of a species. It is concerned with historical principles and processes that influence evolution and speciation. The tiger is an evolutionary wonder; it is a prime example of the responsiveness that some species have to changing climatic conditions. The tiger once had the largest geographic distribution of all cat species; subspecies adaptations allowed them to live in a large range of habitats throughout the Asian continent making it a perfect candidate for the study of phylogeography. This review will examine the evolutionary history of the tiger and will explain how the species was affected by climatic fluctuations and biogeographic processes during the Plestocene epoch.
The theory of Pangaea suggests that the continents were once stuck together into one huge continent. Eventually they started drifting into separated landmasses, which gave birth to the modern continents.
Back about 21,00 years ago there was one big continent called Pangia. Then plates started moving, the ice age happened, Land bridge formed then disapered.
Old worlds and new worlds was carried by the drift that was the continental, splitting from Eurasia and Africa is
When sometimes around twelve thousand years ago climate started to become warmer and ice started to melt, it created a great allowance for ancient hunters to reach North America. Native Americans started to hunt in the wider areas and supply their community with a lot of meat. When people started to have more food, especially meat that caused a fast growth of population. For some unknown reasons, at the same time big mammals and mastodons started to disappear from the Earth. It is a possibility that the climate warming and lack of water sources played a role of the disappearance these big animals. Lack of water put animals in the situation when survival is not possible. The climate change also made a big adjustment in human’s ration and style of life. When people started to spread to North America, they discovered a lot of new food sources like small animals, fish, different kind of nuts and berries.
Animals and plants had to change or evolve due to environmental pressures. Over millions of years the conditions on the Earth have changed tremendously, the environmental conditions we have now are very